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  • Magnetic Structured Nickel Core-Shell @ Silica/PMMA Nanocomposites from Synthesis to Applications
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-17
    Dalia E. Abulyazied, H. M. Abomostafa, G. M. El komy

    Incorporating Ni@SiO2 nanoparticles on poly-methyl methacrylate (PMMA) can alter electrical, optical, and magnetic properties of Ni nanoparticles to be used for energy storage applications, photo electronic devices and spintronic applications. The Ni@SiO2/PMMA nanocomposite samples are prepared by casting method. The morphology of the prepared nanoparticles was examined through high resolution transition electron microscope revealed the formation of SiO2 coating on ni nanoparticles. Furthermore, the topography of nanocomposites was characterized by the field emission scanning electron microscope. We investigated the formation of crystalline phase of Ni nanoparticles through X-ray diffraction. The Complex dielectric permittivity, electrical conductivity, electric modulus and impedance spectra of the PNC films were investigated in the frequency range from 0.1 Hz to 10 MHz. The real and imaginary parts of the permittivity decrease with increasing frequency due to an increase in Ni@SiO2 content. All the nanocomposites showed relatively low conductivity values and high impedance that could be used for nano-dielectrics. UV–Vis spectrophotometer was used to measure optical properties such as transmittance, and absorbance at normal incidence in the wavelength range of 200–1100 nm. The transmittance was found to decrease while the absorbance increases with increasing Ni@SiO2 nanoparticles. The indirect optical band gap of the composite films was calculated, and it was sharply decreased. Magnetic hysteresis plots at room temperature of composites Ni@SiO2/PMMA were studied. All samples demonstrate ferromagnetic behavior with well pronounced magnetic hysteresis.

    更新日期:2020-01-17
  • Electronic Structure, Morphological Aspects, and Photocatalytic Discoloration of Three Organic Dyes with MgWO 4 Powders Synthesized by the Complex Polymerization Method
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-16
    A. F. Gouveia, V. E. M. Vieira, J. C. Sczancoski, P. S. Lemos, S. K. Rout, N. S. Arul, E. Longo, L. S. Cavalcante

    Abstract Heterogeneous photocatalytic (PC) degradation of organic dyes in aqueous solution with semiconductor oxides has been very effective in relation to conventional methods for the wastewater treatment. In this paper, MgWO4 powder was synthesized by the complex polymerization method and heat-treated at 900 °C for 2 h. Their structure, morphology and optical behavior were characterized by different techniques. First-principles quantum mechanical calculations based on the DFT in the B3LYP level was employed to obtain their electronic band structure (EBS) and density of state (DOS). Moreover, we have investigated the PC properties for the discoloration of three organic dyes. XRD patterns indicate that MgWO4 powders present a monoclinic structure. FE-SEM and TEM images showed that these powders are composed of several nanoparticles. UV–Vis spectrum displays an optical band gap of 4.33 eV, while EBS calculation showed a direct band gap value of 4.49 eV. DOS data revealed that the main orbitals involved in the electronic structure are O-2p orbitals in the valence band and W-5d orbitals in the conduction band. Finally, it was obtained the best PC activity of MgWO4 powders with discoloration of 84% for bromocresol green dye, while the discoloration for methyl orange and rhodamine B dyes were 56% and 29%, respectively. Graphic Abstract The electronic structure, morphology and photocatalytic properties of MgWO4 powders synthesized by complex polymerization method calcinated at 900 °C for 2 h have been explained for the first time.

    更新日期:2020-01-17
  • The Effect of Various Capping Agents on Surface Modifications of CdO NPs and the Investigation of Photocatalytic Performance, Antibacterial and Anti-biofilm Activities
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-14
    B. Janani, G. Gayathri, Asad Syed, Lija L. Raju, Najat Marraiki, Abdallah M. Elgorban, Ajith M. Thomas, S. Sudheer Khan

    Abstract CdO nanoparticles (NPs) were prepared through chemical co-precipitation method. The NPs were modified using different organic materials including starch, methyl cellulose, polyvinylpyrrolidone, ethylene glycol, tween 20, polyvinyl alcohol and gelatin. The NPs were characterized by UV–Vis spectrophotometer, TEM, EDX, XRD, FT-IR, particle size analyzer and zeta sizer. The TEM analysis showed that the NPs were hexagonal in shape. The NP’s photocatalytic activity was evaluated and it was slightly influenced by surface modification of NPs. FT-IR analysis confirmed that the particles were not deformed after photocatalysis. The half-life period of methylene blue (MB) dye degradation by CdO NPs was found to be higher than capped CdO NPs. The MB dye reduction rate was decreased with the order of CdO > CdO–T20 > CdO–PVA > CdO–EG > CdO–MC > CdO–S > CdO–PVP > CdO–G. The capped particles showed excellent photostability and reusability. Capped CdO NPs exhibited excellent anti-biofilm and antibacterial activities against Staphylococcus aureus and Pseudomonas aeruginosa of which CdO–T20 showed highest toxicity. The uncapped particles exhibited least photostability and the capping agents extend their stability against photo corrosion and increase the biocompatibility. The present approach can be used to prepare variety of nanohybrid particles depend on industrial applications.

    更新日期:2020-01-14
  • Thermal Degradation Behavior of a New Family of Organometallic Dendrimer
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-13
    Ahmad A. Joraid, Rawda M. Okasha, Mahdi A. Al-Maghrabi, Tarek H. Afifi, Christian Agatemor, Alaa S. Abd-El-Aziz

    Abstract Organometallic dendrimers are one of the most attractive macromolecules owing to their unique properties that derived from the combination of the metallic moieties and the remarkable architecture of the dendrimers. A new family of organoiron dendrimers has been synthesized using divergent methodology. To gain insight into the stability of these dendrimers, we investigated their thermal property using nonisothermal thermogravimetry analysis (TGA), which reveal the kinetic triplets, the pre-exponential factor, the effective activation energy and the reaction model involved in their thermal degradation. The results were obtained at heating rates of 10, 15 and 20 °C min−1. Four nonisothermal methods, the Friedman, the Ozawa and Flynn and Wall, the Kissinger–Akahira–Sunose and the Minimizing were used to investigate the variation of the effective activation energy with the extent of crystallization and, hence, with temperature. In addition, the activation energy was calculated from isothermal data. The degradation mechanism follows the Avrami–Erofeev mechanism for solid-state reaction models. Graphic Abstract

    更新日期:2020-01-14
  • Synthesis of a Conductive Glassy System Based on Inorganic Oxides and Carbon Materials and Their Possible Electroanalytical Application
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-13
    Gastón Darío Pierini, Pablo Emanuel di Pratula, Ana Laura Ochoa, María Eugenia Centurión, Marisa Alejandra Frechero, María Susana Di Nezio

    New materials based on V2O5, TeO2 and a combination of graphite, graphene oxide and multiwalled carbon nanotubes were developed and tested as potential electrochemical sensors. A mixture design with three components in combination with multi-response assays based on the desirability function was used as multivariate optimization for the system composition. The optimal sensor contains graphene oxide and multiwalled carbon in approximately equal amounts. The new sensors characterizations were performed with X-ray diffraction, differential scanning calorimetry, impedance spectroscopy and cyclic voltammetry. The main advantage of this electrodes are does not requires surface activation and exhibited a potential electroanalytical performance with different targeted analytes such as ascorbic acid, aspartame and lead.

    更新日期:2020-01-13
  • Green Synthesis of Silver Nanoparticles using Tragopogon Collinus Leaf Extract and Study of Their Antibacterial Effects
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-11
    Roya Seifipour, Maryam Nozari, Leila Pishkar

    In this research, “Tragopogon collinus” extract was used for synthesis of silver nanoparticles and their biological properties were studied. Based on this, the extract of the plant was prepared and the synthesis of silver nanoparticles under different conditions were investigated. The best conditions for the synthesis of nanoparticles were 0.0025 M of silver nitrate, temperature of 40 °C, pH 10 and 20 cc of the extract, which the formation of the nano particles were confirmed by UV–Vis, TEM, XRD, FT-IR analysis. Average size of the particles were obtained 7 nm and the formation of the nano silver crystals was proved. The synthesized silver nanoparticles showed inhibition zone for both Gram-positive and -negative bacteria and Staphylococcus aureus has better result compared to Escherichia coli.

    更新日期:2020-01-13
  • In-Vitro Antibacterial, Antioxidant and Cytotoxic Potential of Silver Nanoparticles Synthesized Using Novel Eucalyptus tereticornis Leaves Extract
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-10
    M. S. Kiran, Virupaxappa S. Betageri, C. R. Rajith Kumar, S. P. Vinay, M. S. Latha

    In present study, silver nanoparticles (AgNPs) were synthesized using Eucalyptus tereticornis leaves extract as bioreducing agent. Prepared AgNPs were characterized and confirmed using various analytical tools such as UV–Vis spectroscopy, XRD, SEM with EDS and TEM. Crystallographic studies were carried by XRD analysis. Size, morphology was studied by SEM, TEM and elemental composition confirmed by EDS respectively. AgNPs showed significant antibacterial activity against Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus bacterial strains. AgNPs also exhibited promising 1,1-Diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging activity with IC50 59.0 μg/mL. Further, cytotoxic activity performed on Michigan Cancer Foundation-7 (MCF-7) cell line proved that the prepared AgNPs have potential anticancer activity having 63.257 μg/ml 50% inhibition concentration.

    更新日期:2020-01-11
  • Synthesis, Characterization and Thermal Studies of a Nanosized 1D l -Arginine/Copper(II) Coordination Polymer by Sonochemical Method: A New Precursor for Preparation of Copper(II) Oxide Nanoparticles
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-09
    Mina Alikhani, Mohammad Hakimi, Keyvan Moeini, Vaclav Eigner, Michal Dusek

    Abstract In the present work, 1D-copper(II) coordination polymer, {[Cu(μ-l-Arg)2(H2O)]SO4}n (1); (l-Arg: l-Arginine), was synthesized and identified by elemental analysis, FT-IR spectroscopy, molar conductivity, thermal gravimetric analysis (TGA), differential thermal analysis (DTA) and single-crystal X-ray diffraction. The compound 1 was also prepared by a sonochemical process in the form of nanoparticles. The particle size and morphology of the synthesized nanoparticles were investigated by powder X-ray diffraction (PXRD) and field emission scanning electron microscopy (FE-SEM). In the crystal structure of 1, the copper atoms are coordinated in a distorted octahedral geometry. In this geometry, the cis-equatorial plane (N2O2) is constructed by two NO-donor l-Arg ligands. The remaining coordination sites in the apical positions are occupied by an oxygen atom of the neighboring l-Arg and the oxygen atom of a water molecule. In 1, infinite one-dimensional (1D) networks are constructed through carboxylate bridges. Finally, CuO nanoparticles were produced by thermal decomposition of the sonochemically prepared nanoparticles of 1, and characterized by FT-IR, XRD, FE-SEM and EDS.

    更新日期:2020-01-09
  • Conjugated Thermolysis of Metal-Containing Monomers: Toward Core–Shell Nanostructured Advanced Materials
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-08-09
    Gulzhian I. Dzhardimalieva, Igor E. Uflyand

    Abstract A detailed analysis of recent advances in the use of metal-containing monomers as precursors for the preparation of core–shell nanostructured advanced materials by the method of conjugated thermolysis was carried out. This method consists in the simultaneous course of the processes of thermal polymerization of monomers and the formation of metal-containing nanoparticles during thermal transformation. The general scheme of conjugated thermolysis includes three successive stages: dehydration (desolvation), polymerization and thermolysis of the resulting metallopolymers. Particular attention was paid to the composition of solid-phase products of conjugated thermolysis. Kinetic schemes and reactions of thermal transformation of metal-containing monomers were analyzed. The use of the obtained nanocomposites as magnetic materials, sensors, catalysts and tribological materials was generalized. Problems and prospects of using conjugated thermolysis for the production of advanced nanomaterials were outlined.

    更新日期:2020-01-09
  • Synthesis of Ultra-high Molecular Weight SiO 2 - g -PMMA Particle Brushes
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-08-23
    Zongyu Wang, Tong Liu, Kevin C. Lin, Sipei Li, Jiajun Yan, Mateusz Olszewski, Julian Sobieski, Joanna Pietrasik, Michael R. Bockstaller, Krzysztof Matyjaszewski

    Abstract A simple route to synthesize ultra-high molecular weight particle brushes by surface-initiated atom transfer radical polymerization (SI-ATRP) from silica nanoparticles was developed. SiO2-g-PMMA and SiO2-g-PS particle brushes were prepared with different [SiO2–Br]0 concentration of initiating sites on the surface of the nanoparticles. Ultra-high MW (> 106) SiO2-g-PMMA particle brushes with narrow molecular weight distribution (< 1.3) and different grafting densities were synthesized. The grafting density of SiO2-g-PMMA particle brushes decreased with increasing target degree of polymerization. The same conditions were applied to the synthesis of SiO2-g-PS particle brushes. However, due to the lower propagation rate constant of styrene, coupling between SiO2-g-PS particle brushes occurred and also some fraction of unattached homopolystyrene was generated by the thermal self-initiation of styrene, preventing successful synthesis of ultra-high MW SiO2-g-PS particle brushes.

    更新日期:2020-01-09
  • Rhodamine B Adsorptive Removal and Photocatalytic Degradation on MIL-53-Fe MOF/Magnetic Magnetite/Biochar Composites
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-09-19
    Chanaka M. Navarathna, Narada B. Dewage, Akila G. Karunanayake, Erin L. Farmer, Felio Perez, El Barbary Hassan, Todd E. Mlsna, Charles U. Pittman

    MIL-53-Fe metal–organic framework (MOF) was grown using the terephthalic acid linker and FeCl3 into an already prepared, high surface area, magnetic, Douglas fir biochar/Fe3O4 (MBC) adsorbent hybrid. This resulting triphase hybrid, multifunctional, magnetically recoverable, sorptive, photocatalytic and degradative, adsorbent (MOF–MBC) was used both to remove and catalyze the photodegradation of Rhodamine B (Rh B) with or without Cr6+ present. Rh B is a widely used colorant in textile, printing and tanning industries that is also associated with deleterious health effects. Batch aqueous sorption studies were performed at various pHs, Rh B concentrations and temperatures in-order to determine the optimum adsorption pH, kinetics, thermodynamics and sorption capacity. This adsorption followed pseudo-2nd-order kinetics and exhibited a Rh B Langmuir adsorption capacity of ~ 55 mg/g at pH 6, 200 rpm agitation and 25 °C. This MOF–MBC hybrid was characterized by SEM, TEM, EDS, XRD, FT-IR, TGA, BET, Elemental Analysis and XPS. Deethylated and carboxylic compounds were identified as photodegradation intermediates. Electrostatic and π–π stacking interactions are thought to play a significant role in Rh B sorption. Hexavalent chromium (Cr6+) and Rh B often co-exist in tannery and printing waste water. Cr6+ can trigger the photo-degradation of Rh B into CO2 and H2O in the presence of both MIL-53-Fe MOF and MOF–MBC. Hence, adsorbent stripping regeneration can be minimized in real world applications. The biochar phase, aids to disperse the MOF, to minimize particle aggregation, to provide extra stability to the MOF, and serves as secondary adsorption site for heavy metal, oxy anion and organic contaminants. Large biochar particles allow reasonable flow through column beds while supporting other nanophases, which would cause large pressure drops when used alone.

    更新日期:2020-01-09
  • Route to Useful Metallomonomers: Step-Wise Construction of Bimetallic Triangles by Site-Specific Metalation
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-06-22
    Rajarshi Sarkar, Zaihong Guo, Tarak Nath Burai, Charles N. Moorefield, Chrys Wesdemiotis, George R. Newkome

    Three bimetallic triangles were constructed via a step-wise assembly of tailored terpyridine building blocks. Oligomeric trimer 2 was obtained by reacting ligand 1 with Ru(II). Subsequent cyclization of trimer 2 with Zn(II), Cd(II), and Fe(II) resulted in the formation of bimetallic triangles 3, 4, and 5 in high yield, respectively. All triangles were characterized by NMR spectroscopy, ESI and travelling-wave ion mobility-mass spectrometry (MS), as well as gradient MS, which provided insight into their stabilities.

    更新日期:2020-01-09
  • Multifunctional Applications of Graphene-Doped PMMA Nanocomposite Membranes for Environmental Photocatalytic
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-08
    Mai S. A. Hussien, M. I. Mohammed, I. S. Yahia

    Graphene (GNP)-filled polymethyl methacrylate (PMMA) nanocomposites (NCs) were prepared using a facile casting method. Nanocomposites were fully identified through X-ray diffraction and scanning electron microscopy which confirms some interactions between PMMA and GNP layers lead to a reduction in nanocomposite crystallinity. In this work, the impact of graphene on the optical, electrical characteristics and photocatalytic activity of PMMA polymeric matrix. The rapid increase in absorbance values was observed in the UV-region was linked to the optical transitions of GNP electrons from the valence band to the conduction band. Both the bandgaps (Egd and Egind) have been reduced with graphene addition. The calculated Urbach’s Band tail has been increased with GNP content. With the enhanced frequency and GNP contents, the AC electrical conductivity tends to rise. A 1.665 wt% GNP/PMMA exhibits the most effective activity in amoxicillin photodegradation under visible radiation at 30 min due to decrease electron–hole recombination. The kinetics of the photodegradation process was investigated. The GNP/PMMA nanocomposites are a promising candidate in electronic, optoelectrical and environmental applications.

    更新日期:2020-01-08
  • Removal of Various Textile Dyes Using LaMn(Fe)O 3 and LaFeMn 0.5 O 3 Nanoperovskites; RSM Optimization, Isotherms and Kinetics Studies
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-08
    Elham Ghiasi, Azim Malekzadeh

    Abstract Nano-perovskites of La with Mn or Fe cations were prepared by the Pechini method. The products were characterized by FT-IR, TGA/DTA, XRD, FESEM, BET, and AFM analysis. The degradation efficiency of an acidic solution of anionic, cationic and neutral azo or anthraquinone dyes was investigated in the presence of LaMn(Fe)O3 and LaFeMn0.5O3 nanoperovskites without any external reagents under dark. The results reveal that degradation efficiency follows the order of LaMnO3.125 > LaFeMn0.5O3 > LaFeO3. Compared with pure LaFeO3, the LaFeMn0.5O3 sample exhibits an enhanced adsorption capability and consequently catalytic performance. The key parameters such as catalyst type, dye initial concentration and reaction time on the degradation efficiency were optimized using response surface methodology (RSM) based on historical data design. The R2, F-value, and p-value of the fitted quadratic model were obtained 0.9822, 315.51, and smaller than 0.0001, respectively; showing the significance and adequacy of the model. The Langmuir and Freundlich isotherms were utilized to fit the experimental data. The kinetic of degradation have been investigated with the use of pseudo-first-order and -second-order models. The isotherm and kinetic results reveal that each type of dye adsorb differently and need to study separately. Finally, the proposed catalysts outperformed similar catalysts in the degradation of organic dyes.

    更新日期:2020-01-08
  • Synthesis of Si/Cu Amorphous Adsorbent for Efficient Removal of Methylene Blue Dye from Aqueous Media
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-06
    Ahmed M. Hameed

    Abstract In this paper, the gelation technique was utilized for the synthesis of a Si/Cu amorphous sample composed of oxygen, sodium, silicon, and copper. The obtained sample was identified utilizing FT-IR, EDS, XRD, and FE-SEM instruments. The non-crystalline nature of the obtained sample was confirmed through the presence of XRD broadband in the range 2θ = 16°–46°. Also, the obtained sample was utilized as an economically inexpensive and efficient adsorbent for the removal of methylene blue dye from aqueous media. Besides, several parameters were examined for evaluating the removal of methylene blue dye, for example, kinetic, equilibrium, thermodynamic, and reusability. Moreover, the Freundlich isotherm and pseudo-first-order kinetic model controlled the adsorption process. The maximum adsorption capacity of the obtained adsorbent was 102.05 mg/g. In addition, the negative ∆G° values affirmed the spontaneous properties of the adsorption. Also, the adsorption was exothermic and physical because ∆H° is negative and less than 40 kJ/mol. Finally, the obtained adsorbent was regenerated then reused several times without changing their removing efficiency.

    更新日期:2020-01-06
  • Synthesis and Characterization of Ag@Fe 3 O 4 Hetero Nanoparticles: A Highly Active Catalyst for Hydrogen Evolution Reactions
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-06
    Mahendra Sahu, Melad Shaikh, Akanksha Rai, Kalluri V. S. Ranganath

    Abstract Highly active hetero nanoparticles (NPs), Ag@Fe3O4 were synthesized and characterized. These hetero structured materials are formed by allowing a growth of silver NPs on a magnetite surface in the presence of an oleylamine. Thus developed material has been characterized through PXRD, TEM and SEM-EDX analysis. Further, these materials have been evaluated in the hydrogen evolution reactions (HER) in the presence of a weak electrolyte. The current density obtained for hydrogen evolution is − 10 mA cm−2 at an over potential of 33 mV using these NPs.

    更新日期:2020-01-06
  • Effect of Halide Ions on the Microstructure of Bi 2 WO 6 with Enhanced Removal of Rhodamine B
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-04
    Ying Liang, Jiawei Shi

    Abstract Bi2WO6 hierarchical structures have been synthesized by a halide ions-assisted hydrothermal method using Bi(NO3)3·5H2O and Na2WO4·2H2O as the raw materials without any template or surfactant. It is interesting to note that the halide ions (F‒, Cl‒ and Br‒) play a key role on the microstructure of Bi2WO6, especially the morphology and surface activity. At the presence of F‒ in the precursor, the prepared Bi2WO6 exhibits a sheet-like morphology with flat surface, and the sheets further intersect with each other to form a three-dimensional structure. However, when Cl‒ or Br‒ exist in the precursor, the obtained Bi2WO6 with chloride or bromide ions adsorbed on the surface shows a flower-like porous structure constructed by nanosheets, and each nanosheet is assembled by loosely contacted ultrathin nanoplates. The Bi2WO6 structures prepared with the assistance of Cl‒ or Br‒ behave selectively enhanced adsorption and photodegradation for organic dyes mainly attributed to the active surface and special morphology.

    更新日期:2020-01-04
  • Synthesis and Characterization of Graphene Based Hybrid Ligands and Their Metal Complexes: Investigation of Chemosensor and Catalytic Properties
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-04
    Rizgar Maher Zubair, Muharrem Karabörk, Serhan Uruş, Mehmet Tümer

    It has been synthesized the graphene oxide-based hybrid ligands and their Cu(II), Co(II) and Ni(II) complexes. Firstly, GO was reacted with 3-(trimethoxysilyl)propylamine in ethanol and the obtained structure was treated with 2,6-diformyl-4-bromophenol and 2,6-diformyl-4-tert-butylphenol in order to obtain the hybrid ligands HL1 and HL2. The synthesized hybrid ligands and their metal complexes have been and characterized by using FTIR, UV–vis., XRD, EDX, SEM, TEM, cyclic voltammetry, TG/DTA and ICP-OES techniques. Catalytic activities of Cu(II), Co(II) and Ni(II) complexes of the synthesized ligands have been investigated in the oxidation of 2-methyl naphthalene (2MN) to 2-methyl-1,4-naphthoquinone (vitamin K3). The chemosensing behaviours of the hybrid ligands were also researched by using UV–vis. technique upon addition of various metal ions such as Na(I), K(I), Cd(II), Co(II), Cu(II), Hg(II), Ni(II), Zn(II), Al(III), Cr(III), Fe(III), and Mn(II) in (1:5 V) ratio in MeOH. The UV–vis. spectra of free hybrid materials show one absorption band at 257 nm possibly due to π–π* transitions in hybrid ligands. While added the metal cations on the ligand dispersions as Cu(II) and Fe(III) (0.1 mM) (1:5 V) ratios in MeOH, a new absorption bands were appeared at different regions in 275–325, 300–375 nm, respectively, because of the complexation between the hybrid materials and the metal ions.

    更新日期:2020-01-04
  • Effect of Non-aqueous Media on Nano-crystalline SrFe 12 O 19 Particles Produced by Co-precipitation with Metal Chlorides and Evaluation of Their Magnetic and Photocatalytic Properties
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-02
    Fatemeh Bavarsiha, Mehdi Montazeri-Pour, Masoud Rajabi

    The strontium ferrite nano-crystals were prepared via co-precipitation method in different synthesis media including a mixture of ethanol and water (with a volume ratio equal to 3:1) and water. In this way, the iron and strontium chlorides with various molar ratios were utilized as sources for Fe3+ and Sr2+ ions, respectively. Phase analyses, structural properties and morphology of the SrFe12O19 powders were characterized by various techniques including X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, vibrating sample magnetometer and Fourier transform infrared spectra. Thermal decomposition behaviors of the as-synthesized precursors were monitored by DTA/TGA (differential thermal analysis/thermo-gravimetric analysis). The effects of molar ratio, calcination temperature and co-precipitation media of the strontium ferrite powder were investigated. The results of DTA indicated that the strontium hexaferrite prepared by co-precipitation in ethanol/water media was formed at a lower temperature. The maximum saturation magnetization of the strontium ferrite powder with the value of 58 emu/g was achieved at a temperature of 950 °C by a Fe3+/Sr2+ molar ratio of 12. Wide coercivity in the range of 1512–5764 Oe was observed by tuning calcination temperatures. Furthermore, the photocatalytic properties of the resultant optimum SrFe12O19 particles were assessed. The destruction of methylene blue dye was about 46% in the presence of the strontium ferrite under UV light irradiation for 120 min.

    更新日期:2020-01-02
  • Effect of the applied potential condition on the photocatalytic properties of Fe 2 O 3 |WO 3 heterojunction films
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-02
    G. S. Costa, M. J. S. Costa, H. G. Oliveira, L. C. B. Lima, G. E. Luz, L. S. Cavalcante, R. S. Santos

    Abstract Semiconductors heterojunction and potential application have been investigated as strategy to improve the catalytic processes performance. In this study, we investigated the photocurrent response of photoanodes composed of two different heterojunctions, i.e., Fe2O3|WO3 and WO3|Fe2O3, which were prepared directly on transparent and conductive glass substrate (fluorine-doped tin oxide or FTO-glass) by combining hydrothermal and drop-casting methods. From photoelectrochemical studies, the conduction band edge’s positions for each semiconductor were determined using the Butler–Gärtner model. The heterojunction films were utilized as photoanode in photodegradation of Rhodamine B (RhB) dye in aqueous solution. Under polychromatic irradiation, superior performance was registered for FTO|WO3|Fe2O3 photoanode, reaching a RhB dye photodegradation around of 32% in 3 h. Moreover, we performed structural analyses, optical characterizations, and morphological property investigations using XRD, UV−Vis, and SEM techniques, respectively. Moreover, from the electrochemical studies, the superior photodegradation performance and photocurrent density for photoanode were registered for FTO|WO3|Fe2O3 film. Graphic abstract

    更新日期:2020-01-02
  • Nucleoside Isolation Performance of Ti 4+ /Zr 4+ Immobilized Polydopamine Coated, Monodisperse-Porous Titania Microbeads
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-02
    Kadriye Özlem Hamaloğlu

    Abstract A Ti4+/Zr4+ ion immobilized sorbent was developed by starting from monodisperse-porous titania microbeads, for the isolation of nucleosides via immobilized metal affinity chromatography (IMAC). For the synthesis of IMAC sorbent, the monodisperse-porous titania microbeads were coated with a polydopamine (PDA) layer. PDA coated titania microbeads were then interacted with TiCl4 or ZrOCl2 solution for the immobilization of Ti4+ or Zr4+ ions onto the PDA layer. Five nucleosides (adenosine, uridine, cytidine, thymidine and guanosine) were individually adsorbed onto Ti4+ or Zr4+ immobilized titania microbeads in aqueous buffer in a pH range of 4–9. The desorption of nucleosides was performed in an aqueous formic acid solution. The nucleoside isolation performance of Ti4+ immobilized sorbent was also compared with Zr4+ immobilized sorbent, PDA coated titania and bare titania microbeads. The highest equilibrium adsorptions and the highest desorption yields were obtained with Ti4+ immobilized sorbent for all nucleosides. It was demonstrated that pH 7 was found as the most appropriate for the adsorption of all nucleosides onto Ti4+ immobilized sorbent, which was also close to the physiological pH of urine. The highest equilibrium adsorption was observed with adenosine as 12.67 mg adenosine/g Ti4+ immobilized sorbent. Almost quantitative desorption yields were achieved with all nucleosides adsorbed in a wide range of pH onto Ti4+ immobilized sorbent. With respect to the similar sorbents developed previously, we believe that the proposed sorbent is a promising candidate for being a stationary phase particularly for the construction of micro-column based IMAC systems used in the continuous isolation of nucleosides.

    更新日期:2020-01-02
  • Photochemically-Generated Silver Chloride Nanoparticles Stabilized by a Peptide Inhibitor of Cell Division and Its Antimicrobial Properties
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-02
    Geomar F. Cruz, Iris de Araujo, Marcelo D. T. Torres, Cesar de la Fuente-Nunez, Vani X. Oliveira, Felipe N. Ambrosio, Christiane B. Lombello, Dnane V. Almeida, Fernanda D. Silva, Wanius Garcia

    The 40 amino acid residues peptide MciZ (Mother Cell Inhibitor of FtsZ) represents a promising antibacterial agent as it is an effective inhibitor of bacterial cell division, Z-ring formation and localization. However, its efficacy is limited to Gram-positive bacteria as MciZ is unable to penetrate into Gram-negative organisms. In this study, we report the synthesis of plasmonic silver chloride nanoparticles stabilized by MciZ (NP/MciZ). NP/MciZ were synthesized using a fast and green route under blue light irradiation. Electron microscopy showed that NP/MciZ were enveloped by a peptide layer responsible for colloidal stability. X-ray diffraction analysis showed that silver chloride nanoparticles were crystalline in nature with small proportion of metallic silver. NP/MciZ showed a dose-dependent cytotoxicity against mammalian VERO cells. However, NP/MciZ exhibited remarkable antibacterial activity against Gram-positive bacterium B. megaterium comparable to MciZ. Furthermore, NP/MciZ showed similar antimicrobial activity against the Gram-negative bacterium E. coli and the yeast C. albicans. The photochemically-generated NP/MciZ presented here is a new organic–inorganic hybrid nanomaterial and has potential for biomedical or other applications.

    更新日期:2020-01-02
  • Metal Chelates of Tridentate (NNO) 1,2,4-Triazine Schiff Base: Synthesis, Physico-chemical Investigation and Pharmacological Screening
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-01
    G. R. Priya Dharsini, Clarina Thanaraj, Rama Velladurai

    Present work portray the synthesis of four new tridentate Schiff base ligand transition metal chelates having 1,2,4-triazine and 1,4-Naphthoquinone as a potential drug candidate, with composition ML2, where M=Co(II), Ni(II), Cu(II) and Zn(II); L = 4-(2-(5,6-diphenyl-1,2,4-triazin-3-yl)hydrazono)-3-hydroxynaphthalene-1(4H)-one (DTN). Credible structure of the synthesized compounds was investigated using different techniques like elemental analysis, molar conductance, mass spectra, magnetic susceptibility, UV–Visible, IR, NMR and TGA. The results were unfailing with tridentate nature of the ligand and octahedral geometry of metal chelates. Thermal scrutiny of the synthesized complexes exemplified absence of coordinated water molecules, decomposition patterns of the complexes and their stabilities. Furthermore, redox behaviour of the synthesized compounds was examined by cyclic voltammetry in DMSO solution. Antimicrobial screening tests played a pivotal role in displaying the presence of metal ion in the ligand system. Chemical nuclease activity was investigated to study the DNA cleavage activities of the synthesized compounds and effectual cleavage was revealed by Co(II) and Cu(II) metal chelates of DTN.

    更新日期:2020-01-02
  • Synthesis, Doping and Characterization of new Molecular Semiconductors Containing (2E, 4Z)-5, 7-diphenylhepta-2, 4-dien-6-ynoic acids
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-01
    R. Ballinas-Indili, M. E. Sánchez-Vergara, Rubén A. Toscano, C. Álvarez-Toledano

    This work refers to the synthesis and characterization of new (2E, 4Z)-5, 7-diphenylhepta-2, 4-dien-6-ynoic acids. We describe the nucleophilic addition of bis(trimethylsylil)ketene acetals (TMS) to aryl ynones substituted by halogen groups activated by boron trifluoride diethyl etherate (BF3·Et2O) for the stereoselective synthesis of dienynoic acid. The molecular materials were structurally characterized by IR spectroscopy, NMR spectroscopy and X-ray diffraction. After the characterization the synthesized acids were doped with indium(III) phthalocyanine chloride (In(III)PcCl) in order to generate a organic semiconductor that was characterized by UV–Vis spectroscopy to subsequently obtain their optical bandgap (Eg) values. The Eg value was compared to that obtained for the pure state dienynoic acids in order to evaluate the doping effect with the In(III)PcCl. The Eg diminished from values near 2.6 eV obtained for pure compounds to values around 1.4 eV for the same compounds, but now with doping. With the molecular semiconductors obtained were manufactured structures of disperse heterojunction which later were evaluated in their electric behavior. A behaviour ohmic at low voltages and Space Charge Limited Current (SCLC) at higher voltages was observe from the study J(V) carried out.

    更新日期:2020-01-01
  • Syntheses, Crystal Structures and Properties of Zinc(II), Cadmium(II) and Cobalt(II) Coordination Complexes Based on 2,4-Dichlorophenoxyacetic Acid and Different Imidazole-Containing Ligands
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-01
    Yong-Hong Zhou, Yun Xu, Qian-Lan Tao, Tian Tian, Xian-Hui Wei, Qiao Chu, Biao Shi

    A series of Zn(II), Cd(II), and Co(II) mixed-ligand coordination complexes, namely, [Cd2(2,4-D)4(PBIX)2] (1), [Cd(2,4-D)2(OBIX)]n (2), [Zn(2,4-D)2(OBIX)]n (3), [Co(2,4-D)2(BIM)(H2O)2]n (4), and [Cd(2,4-D)(NBI)]n (5) (2,4-DH = 2,4-dichlorophenoxyacetic acid, PBIX = 1,4-bis(imidazole-1-ylmethyl)benzene, OBIX = 1,2-bis(imidazole-1-ylmethyl)benzene, BIM = 1,1′-(1,4-butanediyl)bis(benzimidazole), and NBIH = 6-nitrobenzimidazole) have been prepared and fully characterized by elemental analysis, IR spectra, and single crystal X-ray diffraction. X-ray analysis reveals that the bimetallic Cd(II) subunits in complex 1 are bridged by PBIX to form a 0D structure with 26-membered metallomacrocycle. In complexes 2, 3 and 4, the metal centers are linked by OBIX or BIM molecules to generate 1D chains. In complex 5, the Cd(II) ions are bridged by NBI ligands to form a 2D network, which is further extended to a 3D framework through π–π stacking interaction. The structural diversification of complexes 1–5 illustrates the great influence of the metal centers and imidazole-containing ligands on the self-assembly of coordination architectures. In addition, solid fluorescence properties and thermal stability for these crystalline materials are also studied.

    更新日期:2020-01-01
  • Facile Synthesis of Silver Nanoparticles Using Lantana trifolia Aqueous Extracts and Their Antibacterial Activity
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2020-01-01
    Edwin Shigwenya Madivoli, Patrick Gachoki Kareru, Anthony Ngure Gachanja, Samuel Mutuura Mugo, David Sujee Makhanu, Sammy Indire Wanakai, Yahaya Gavamukulya

    Synthesis of metallic nanoparticles using secondary metabolites present in plant extracts has attracted attention. In this study, Lantana trifolia aqueous extracts were used to synthesize silver nanoparticles (AgNPs) which were then screened for their antimicrobial activity. The morphology, size and functional groups present in AgNPs was evaluated using electron microscopy and Fourier transform infrared spectroscopy (FT-IR). The role of temperature, reaction time and concentration of precursor ion were evaluated by measuring the surface plasmon resonance of AgNPs using UV–Vis spectroscopy. The crystal structure, hydrodynamic diameters and redox potential were evaluated using powder X-ray diffractometer (PWXRD), dynamic light scattering (DLS) and cyclic voltammetry respectively. The data obtained in this study revealed that increase in the reaction time led to an increase in surface plasmon resonance of AgNPs while the increase in temperature from 20 to 35 ℃ increased the rate of AgNPs synthesis. The XRD diffractogram revealed that the particles were composed of silver with 2θ = 38.36, 44.428, 54.89, and 57.87, corresponding to the silver crystal planes of (111), (200), (220), and (311). The diameters of the nanoparticles were between 35 and 70 nm, and they had moderate antimicrobial activity against E. coli, P. aeruginosa, C. albicans, S. aureus and B. subtilis.

    更新日期:2020-01-01
  • Design and Functions of Macromolecular Electron-Reservoir Complexes and Devices
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-26
    Didier Astruc

    In this mini-review article the concept of electron reservoir materials developed in the author’s laboratory is summarized. Starting from mono- and bimetallic electron reservoir complexes and their electronic and catalytic properties this concept extends to macromolecular electron-reservoir devices including metallodendrimers, metallopolymers and macromolecule-stabilized late transition-metal nanoparticles. The electronic switch in these devices is discussed as well as the structure-dependent possibilities to stabilize both utilized redox forms. Catalytic and energy-related applications involving redox metallomacromolecules and nanoparticles and their potential extension are briefly discussed.

    更新日期:2019-12-27
  • Physical Investigations on Various Weight Percentage of Acetic Acid Doped Polypyrrole by Chemical Oxidative Polymerization
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-24
    B. Gowtham, V. Ponnuswamy, G. Pradeesh, R. Suresh, S. Ramanathan, S. Ashokan

    Abstract Polypyrrole (PPy) was synthesized with different weight percentages of acetic acid (10 wt%, 30 wt%, and 50 wt%) through chemical oxidative polymerization. The structural, functional, optical, morphological, dielectric and electrical properties of PPy were investigated by XRD, FT-IR, UV–Vis, SEM, electrical conductivity and impedance analysis. The XRD and SEM analysis shows the formation of PPy and confirms the amorphous nature and the merely globular structure of the material. The FT-IR spectrum reveals the functional groups present in the samples. The absorption peak centered at 280 nm indicates π–π* transition in the heteroatom aromatic pyrrole ring through the recorded UV–Vis spectrum. The calculated bandgap value of the PPy samples is found to be 4.25, 3.85 and 3.50 eV. The room temperature impedance spectroscopy performs to analyze the dielectric and electrical properties of PPy with the frequency range 50 Hz–5 MHz. The AC conductivity remains constant up to 1 MHz and its value increases slowly and attains a maximum at a higher frequency which confirms the semiconducting behavior of samples.

    更新日期:2019-12-25
  • A Potential Polymeric Nanogel System for Effective Delivery of Chlorogenic Acid to Target Collagen-Induced Arthritis
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-21
    Yuxia Ma, Yuxiu Song, Fang Ma, Guifang Chen

    Abstract The severe lethal activity of bone tissue and cartilage as denote to rheumatoid arthritis (RA). Polyphenols are extensively used as a curative agent for many diseases due to its anti-inflammatory, antioxidant and immunomodulant properties in many inflammatory chronic conditions. The selective delivery of polyphenol to the affected joints side achieves a better treatment strategy. Nanogels are promising medication conveyance frameworks and are made out of cross-connected different polymeric networks. The present investigation focusing on the potential uses of folic acid (FA) conjugated polymeric nanogel system is made by the interconnection between chitosan (CS) and poly(2-ethyl-oxazoline) (CS-POX) used to encapsulate chlorogenic acid (CA) to deduce the inflammatory effects in collagen-induced arthritis (CIA). The different dose of CA (1, 5, and 10 mg/mL) encapsulated CS-POX nanogel assists to clinical evaluation of diverse biological parameters including arthritis index (AI), hind paw volume, histological analysis, vital organ weight percentage and quantitative measurement of cytokines including, interleukin (IL)-1β, IL-6, IL-17, tumor necrosis factor (TNF-α) and prostaglandin enzyme 2 (PGE2). The results proved the oral administrated polymeric nanogel effectively deduces the joint space narrowing, AI score, the hind paw and minimizes the weight of vital organs in CIA rats. The increased level of inflammatory-related immune components such as (IL)-1β, IL-6, IL-17, TNF-α, PGE2 and anti-CII antibody in blood serum and joint tissue samples were subsequently reduced in the CIA rats after the treated with FA conjugated CS-POX-CA nanogel.

    更新日期:2019-12-21
  • Multicomponent Self-assembly of Two Cd(II)-Based Coordination Polymers: Synthesis, Structures and Photocatalytic Properties
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-19
    Wen-Chao Kang, Zeng-Chuan Hao, Chao Han, Gui-Ying Dong

    Two Cd(II) coordination polymers (CPs), namely {[Cd(L1)(mip)]·0.33H2O}n (1) and {[Cd(L2)(BDC-Cl4)]·1.35H2O}n (2) (H2mip = 5-methylisophthalic acid; L1 = 1,5-bis(benzimidazol-1-yl)pentane; H2BDC-Cl4 = tetrachloroterephthalic acid; L2 = 1,2-bis(2-methylbenzimidazol-1-yl)benzene) were synthesized and characterized. 1 features a 3D pcu network, 2 displays a 2D (4,4) layer. The photocatalytic activities of CPs 1 and 2 for degradation of methylene blue (MB) solution as well as the influence factors such as pH, concentration of dye and catalyst dosage were investigated under UV irradiation. The thermogravimetric analyses and luminescence properties of 1 and 2 were also carried out.

    更新日期:2019-12-19
  • Ethylenediamine Functionalized Metalloporphyrin Loaded Nanofibrous Membrane: A New Strategic Approach to Air filtration
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-19
    Sowndarya Ramachandran, Sheeja Rajiv

    In the current work, synthesised Magnesium Tetraphenylporphyrin (MgTPP) functionalised with ethylenediamine (EDA) loaded onto Polyetherimide (PEI) nanofibers were fabricated by means of electrospinning. The ability of the developed membrane for potential CO2 and PM2.5 capture was evaluated. Ethylenediamine, the chelating agent was loaded onto the fibrous structure; the introduced amino group pendants captured CO2 molecules effectively. Structural evidence was revealed by infrared spectroscopy. The average diameter of the amino modified MgTPP/PEI nanofibers was found to be in the range of 1.2–1.4 μm and possessed a high thermal stability of 411 °C. The contact angle measurements proved the hydrophilic nature of the filter. The fibrous membrane possessed high CO2 and PM2.5 filtration capacity of 74% and 81% respectively with extraordinary non-zero dust loading capacity. Finally, the significance of the addition of EDA for CO2 adsorption was proved statistically.

    更新日期:2019-12-19
  • Magnetic Properties of Cu 2+ Substituted Ni–Zn Nano-Crystalline Ferrites Synthesized in Citrate-Gel Route
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-18
    D. Venkatesh, B. B. V. S. Vara Prasad, K. V. Ramesh, M. N. V. Ramesh

    The Nano-crystalline divalent copper ion substituted Ni–Zn ferrites having chemical formula Ni0.5Zn0.5−xCuxFe2O4 (where x = 0.05 to 0.25 in steps of 0.05) were prepared by citrate gel auto-combustion method. The X-ray diffraction study confirmed the single phase spinel cubic structure and the crystallographic studies indicate that the lattice parameter was observed to be decreased with increasing of Cu2+ concentration. Scanning Electron Microscopy was conducted to observe surface morphology and grain size/shape. Magnetic measurements were carried out using Vibrating Sample Magnetometer for magnetization and Impedance analyzer for permeability up to 15 MHz. Magnetization studies revealed that the incorporation of copper into the system modified the exchange interactions leading to gradual decrease in saturation magnetization. Highest saturation magnetization was observed for the base composition Ni0.5Zn0.5CuFe2O4 with 61 emu/g. There was an increase in coercivity and remanence with copper concentration. Frequency and temperature variation of inductance measurements were performed to understand the system behaviour at different threshold limits. Enhancement of initial permeability was observed up to the concentration x = 0.15 and its variation is observed to be grain size dependent. Temperature variation of permeability leads to Curie temperature, which was increased with increasing of Cu2+ concentration. All magnetic characteristics of the present system of nano crystalline ferrites displayed interesting deviations and reasons were well justified.

    更新日期:2019-12-19
  • Inorganic–Organic Hybrids of Tungsten Oxide as the High Performance Intercalation Supercapacitor Electrodes
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-17
    Maryam Afsharpour, Samaneh Bayatpour, Leila Seifikar Gomi

    In this research, the layered inorganic–organic hybrids materials based on tungsten oxide were synthesized using three amino-hydroxy ligands; 2-(2-aminoethoxy) ethanol (AEE), 2-(2-aminoethylamino) ethanol, and diethylenetriamine, by direct intercalation of these guest ligands. Then, the synthesized hybrids were applied as the novel supercapacitor electrode materials. Various analytical techniques were utilized to investigate the interaction between the inorganic and organic components and to understand how the intercalation of organic guests effects on the electrocapacitive performance of the electrodes. The evaluation of electrodes properties shows the outstanding performance of the [WO3·AEE] hybrid electrode that is annealed at 300 °C, the hybrid with more oxygen donor ligands versus the other ligands that have more amino groups. This hybrid has the highest specific capacitance of 207.27 F/g at the current density of 2 A/g with 100% capacitance retention. Also, this hybrid electrode exhibits a good power density of 1127 Wh kg−1 at the energy density of 1.25 kW kg−1. These results exhibit the outstanding electrocapacitive performance of hybrids revealing from the synergetic effects of organic and inorganic parts in the hybrids that made them more active than pure WO3 electrode. The intercalations of organic guests increase the oxide interlayer space that can accelerate the ion diffusion. Also, the electron donations of organic guests to the tungsten inorganic center can surprisingly increase the kinetics of electron transfer and consequently improve the performance of the electrode.

    更新日期:2019-12-18
  • Application of β -Cyclodextrin-Modified/PVDF Blend Magnetic Membranes for Direct Metal Ions Removal from Wastewater
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-16
    Rui Zhang, Yu Li, Xuyang Zhu, Qiong Han, Tongqing Zhang, Yi Liu, Kunlin Zeng, Chen Zhao

    Herein, a composite membrane was synthesized by adding β-cyclodextrin modified Fe3O4/GO (β-MGO) to polyvinylidene fluoride (PVDF), in the presence or absence of magnetic field via the combination of magnetic field induction and phase conversion techniques. FT-IR, Raman, XRD, TEM, XPS and hysteresis loop results indicate β-MGO was synthesized successfully. By analyzing the characterization results of the membrane, β-MGO can be adsorbed onto the surface of the membrane under magnetic field (M-β-MGO) conditions. The changes of pure water flux, BSA rejection, hydrophilicity, porosity, pore size and anti-pollution performance of M-β-MGO and β-MGO membrane were discussed with the content of β-MGO. The M-β-MGO membrane shows the best performance when the β-MGO content is 0.7%. In addition, our experimental results on the removal of heavy metal Cu2+ show that after five cycles, the rejection rate and adsorption capacity of Cu2+ are still as high as 75% and 0.94 mg/g. Meanwhile, it is find that pH > 6 can significantly increase the removal rate of Cu2+, and the membrane is suitable for removing Cu2+ concentrations below 30 mg/L. Therefore, this study presents a novel strategy for developing high-performance hybrid membranes via manipulating the migration of nanomaterials to the membrane surface.

    更新日期:2019-12-17
  • Modification and Characterization of Cellulose Fibers from Palm Coated by ZrO 2 ·nH 2 O Particles for Sorption of Dichromate Ions
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-14
    Walace A. Paixão, Larissa S. Martins, Noelle C. Zanini, Daniella R. Mulinari

    Surface modification of palm fibers has been made by different methods. This work, cellulose fibers from palm were bleached and modified by zirconium oxychloride. Cellulose fibers were coated with ZrO2·nH2O particles with different amount of zirconium oxychloride in acidic medium in the presence of cellulose fibers using ammonium hydroxide as the precipitating agent. The coating of hydrous zirconium oxide on cellulose fibers was carried out by scanning electron microscopy, X-ray diffraction, themogravimetric analysis, attenuated total reflectance Fourier transform infrared spectroscopy and atomic emission spectrometry with inductively coupled plasma were also techniques used to characterize the materials. Dichromate ion was adsorbed on the Cell/ZrO2·nH2O by immersing this solid in an aqueous solution of potassium dichromate. The analyses to determine the concentration after the adsorption were made using UV–Vis spectrum, in a wavelength of 349 nm. The results were satisfactory showing that the Cell/ZrO2·nH2O materials obtained presented good adsorption capacity. Results showed that the amount ZrO2·nH2O particles coated on cellulose fibers influenced in the sorption capacity of dichromate ions.

    更新日期:2019-12-17
  • Biodistribution and Pharmacokinetic Study of Gemcitabine Hydrochloride Loaded Biocompatible Iron-Based Metal Organic Framework
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-13
    Preeti Kush, Tania Bajaj, Manjot Kaur, Jitender Madan, Upendra Kumar Jain, Parveen Kumar, Akash Deep, Ki-Hyun Kim

    This study was designed to improve bioavailability and therapeutic efficacy of Gemcitabine (GEM) with reduced side effects using MOF MIL-100 as cargo. MIL-100 was synthesized, and characterized by microscopic and spectroscopic techniques. Impregnation approach was used for encapsulation of GEM inside the MIL-100 (i.e., MIL100-GEM). In-vitro release studies of MIL100-GEM was carried out in different media (PBS, deionized water and Tris buffer, pH = 7.4, 9.5 mM) to find out the drug release mechanism. Cytotoxicity and apoptosis assays were evaluated using MTT and fluorescence-activated cell sorting (FACS) assay in MiaPaCa-2 pancreatic cancer cell lines. Biocompatibility, pharmacokinetic and biodistribution studies of MIL100-GEM were assessed in Wistar rats. MIL100-GEM exhibited high encapsulation efficiency (78.6 ± 0.5%) and maximum payload (23.6 ± 1%). PXRD confirmed crystallinity of MIL-100, and did not show any effect on its structural integrity after encapsulation of GEM. In-vitro release studies revealed a biphasic release pattern in PBS buffer which followed Higuchi diffusion kinetics. In-vitro cytotoxicity studies showed low IC50 value for MIL100-GEM (3.50 ± 1.33 µg/ml) compared to GEM (6.22 ± 1.55 µg/ml), ensuring adequate cell proliferation after 72 h. Hemolysis study showed that MIL100-GEM (14.54 ± 1.3%) had better biocompatibility than the native GEM (30.52 ± 1.67%). Furthermore, pharmacokinetic and biodistribution studies exhibited ∼17-fold increased bioavailability, ∼20-fold increased distribution half-life and ∼15-folds elimination half-life of GEM with less accumulation of drug in the kidneys. MIL-100 MOF was synthesized and characterized to address the metabolic degradation issue of GEM. Biocompatible, MIL100-GEM demonstrated efficient drug (GEM) loading and enhanced cytotoxic activity in pancreatic cancer cell line with augmented bioavailability, providing MIL-100 a promising drug cargo.

    更新日期:2019-12-17
  • Cytotoxicity Analysis of Biosynthesized Selenium Nanoparticles Towards A549 Lung Cancer Cell Line
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-11
    Soumya Menon, VenkatKumar Shanmugam

    The biosynthesis of selenium nanoparticles is performed with the traditionally used medicinal seed of Mucuna pruriens and the synthesis rate of a product is stabilized when the experimental conditions are well operated, to serve this purpose optimization techniques like response surface methodology has been followed. The technique is employed for analysing the average size of the selenium nanoparticles as the response. The variables included are precursor concentration, seed extract concentration and time taken for the synthesis, also the interactive conditions against the size were evaluated, on the basis of quadratic equation constructed with high R2 (coefficient of determination) value of 98%. The responses were collected from DLS and the nanoparticles were further characterized using SEM, TEM, AFM, XRD, and FTIR. The size of the optimized nanoparticles produced was nearly 100–120 nm validated by the software and also from various characterization tools. The optimized SeNPs were subjected to antioxidants through DPPH assay, in which the IC50 value was 60 µg/mL. The cell viability was also evaluated, the calculated IC50 was 40 µg/mL at 48 h, and for 24 h the IC50 was 80 µg/mL. The cost-effective and environmental friendly selenium nanoparticles can be utilized further for future biomedical applications.

    更新日期:2019-12-11
  • Microwave Aqueous Synthesis of Mesoporous Carbons for Highly Effective Adsorption of Berberine Hydrochloride and Matrine
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-09
    Yin Li, Meng Cheng, Yugen Jiang, Genxing Pan, Hongpeng Wang, Shengdao Shan

    A microwave aqueous synthesis method has been successfully utilized for preparing mesoporous carbon adsorbents, and the microwave aqueous treatment duration has been decreased from 10 h of hydrothermal treatment to less than 1 h. The mesoporous carbons have Brunauer–Emmett–Teller (BET) surface areas ranging from 1913.5 to 2213.8 m2/g, pore volumes from 1.41 to 2.40 cm3/g, average pore diameters between 3.29 and 4.40 nm, and the surfaces of the mesoporous carbons are mainly hydrophilic with few O-containing functional groups. The pore textural properties of the mesoporous carbons critically depend on the microwave treatment conditions. All the mesoporous carbons showed considerable adsorption ability for berberine hydrochloride and matrine, and the highest adsorption capacities at the initial concentration of 0.08 mg/mL and 298 K are 363.8 mg/g and 269.7 mg/g, respectively. Adsorption thermodynamic parameters of berberine hydrochloride and matrine on the selected carbon sample were calculated. The adsorption rate of the two alkaloids on the selected carbon sample is fast. These results indicate that the microwave-prepared mesoporous carbons could be promising adsorbents for highly efficient adsorption of berberine hydrochloride and matrine.

    更新日期:2019-12-11
  • A Comparative Study on the Pollutant Removal Efficiency of CoFe 2 O 4 @HKUST-1 MOF and CoFe 2 O 4 Nanoparticles
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-07
    Tahoura Saemian, Mehrnaz Gharagozlou, Moayad Hossaini Sadr, Sanaz Naghibi

    In this work, CoFe2O4 nanoparticles were fabricated by the Pechini sol–gel technique. Then, Cu3(BTC)2 or HKUST-1 metal–organic framework was used to prepare Co-ferrite@HKUST-1 composite. The as-synthesized composite powder and Co-ferrite nanoparticles were compared by their performance for methyl orange (MO) and methylene blue (MB) degradation. X-ray diffractometry (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM) were utilized to evaluate the as-prepared samples. Results showed that the average grain size was about 20–30 nm. The magnetic saturation value for Co-ferrite nanoparticles and Co-ferrite@HKUST-1 composite were 65 and 20 emu/g, respectively. Results of the removal efficiency of the Co-ferrite samples approved that just the cation dyes concentrations decreased, whereas in the case of the Co-ferrite@HKUST-1 composite samples both anionic and cationic organic dyes were degraded efficiently.

    更新日期:2019-12-11
  • Photocatalytic/Antimicrobial Active Film Based on Wheat Gluten/ZnO Nanoparticles
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-06
    Mohammad Rezaei, Sajad Pirsa, Sona Chavoshizadeh

    The purpose of this study was to investigate the photocatalytic/antimicrobial properties of biodegradable film based on wheat gluten/zinc oxide nanocomposites (WG/ZnO) for the active packaging of food products. In this study, central composite design (CCD) was used to study the effect of gluten percent (15, 22.5 and 30%) and ZnO percent (0, 2 and 4%) on the photocatalytic, mechanical and physicochemical properties of WG/ZnO film. Some properties of films, including antimicrobial, antioxidant, FT-IR, SEM, solubility, water absorption, thickness, moisture, colorimetric (L*, a* and b*) and opacity were investigated. Antibacterial and antifungal properties of films based on photocatalytic activity were investigated in three wavelengths of 500, 365 and 254 nm on the Escherichia coli and Aspergillus Niger. The results of the photocatalytic/antimicrobial activity of the films showed that pure gluten film had no effect on bacteria and fungi at three wavelengths, but films containing zinc oxide nanoparticles showed a significant inhibitory effect on bacteria and fungi at 365 and 254 nm. Antibacterial and anti-fungal inhibitory effects were observed at 254 nm stronger than 365 nm (p < 0.05). This result showed that at lower wavelengths the photocatalytic activity was induced to the film. The results of the antioxidant test showed that pure gluten had no antioxidant activity, but antioxidant activity increased with increasing zinc oxide nanoparticles significantly (p < 0.05). The results of the FT-IR analysis showed that new interactions between zinc oxide nanoparticles and gluten polymer of wheat were created. The results showed that when the ZnO particle concentration was low, these particles were distributed uniformly, but high concentration of zinc oxide in the film leaded to agglomeration of these particles.

    更新日期:2019-12-11
  • Dispersive Micro-solid Phase Extraction Based on Co 3 O 4 Modified Nanoclinoptilolite for Fast Determination of Malachite Green in the Environmental Water Samples
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-04
    Roya Mohammadzadeh Kakhki, Majid Bina

    In this work a simple dispersive solid phase microextraction based on Co3O4 modified nanoclinoptilolite was developed for the preconcentration and fast determination of malachite green in the environmental samples. In the first step a rapid mass transfer of dye to the surface of the sorbent was accrued and therefore, the extraction process was performed in a short time. In the second step the dye was desorbed on the methanol solvent. Some factors that have effect on the microextraction performance such as the type and volume of solvent, dose of Co3O4 modified nanoclinoptilolite, salinity and pH were optimized. Under these conditions enrichment factor was obtained 154-fold for the malachite green. Also the limit of detection was in the range of 5 µg/ml. Under optimal conditions this method was successfully applied for determination of malachite green in various water samples.

    更新日期:2019-12-11
  • Selective Antimicrobial Performance of Biosynthesized Silver Nanoparticles by Horsetail Extract Against E. coli
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-04
    Miona Miljković, Vesna Lazić, Slađana Davidović, Ana Milivojević, Jelena Papan, Margarida M. Fernandes, Senentxu Lanceros-Mendez, S. Phillip Ahrenkiel, Jovan M. Nedeljković

    The aim of this study was the development of a non-toxic, biosynthetic antimicrobial agent which selectively acts on only one type of microorganism, and preserves the microbiota. Antimicrobial performance of biosynthesized silver nanoparticles (Ag NPs) by horsetail (Equisetum arvense L.) extract was examined against Gram-negative bacteria Escherichia coli and Gram-positive bacteria Staphylococcus aureus, as well as yeasts Candida albicans and Saccharomyces boulardii. Also, the cytotoxicity of Ag NPs was examined toward pre-osteoblast cells. The synthetic conditions—concentration of extract, temperature, and pH—were optimized to prepare silver colloids with different particle size distributions and long-term stability. The obtained samples were characterized using transmission electron microscopy, X-ray diffraction analysis, and absorption spectroscopy. The smaller-sized Ag NPs (~ 10–20 nm), prepared at a lower temperature (20 °C), showed better antimicrobial performance against E. coli compared to larger ones (~ 40–60 nm), prepared at high temperature (100 °C). On the other hand, both samples did not display any toxic action against bacteria S. aureus, or yeasts C. albicans and S. boulardii. Non-cytotoxic behavior of Ag NPs toward pre-osteoblast cells was observed for the concentrations of silver ≤ 2.25 and ≤ 4.5 mg L−1 for 10–20 and 40–60 nm-sized Ag NPs, respectively. Biosynthesized Ag NPs by horsetail extract display selective toxic action against E. coli at the ecologically acceptable concentration level.

    更新日期:2019-12-11
  • Synthesis of Carbon Stabilized Zinc Oxide Nanoparticles and Evaluation of Its Photocatalytic, Antibacterial and Anti-biofilm Activities
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-03
    B. Janani, Asad Syed, Lija L. Raju, Helal F. Al-Harthi, Ajith Mesmin Thomas, Arunava Das, S. Sudheer Khan

    The present study reports a microwave assisted chemical co-precipitation method to synthesize carbon stabilized zinc oxide nanoparticles (ZnO NPs). The NPs were characterized by using UV–visible spectrophotometer, scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDS). UV–visible absorption spectra showed an absorption maximum at 385 nm. Hydrodynamic size distributions of ZnO NPs were measured by using particle size analyzer. ZnO-C-0.5 showed the lowest size, 55 nm compared to other particles. All the carbon coated particles showed a zeta potential of > − 30 mV indicates the stability of the particles. The rate of ·OH formation was higher in case of ZnO-C-0.5 compared to ZnO-C-0.25, ZnO-C-0.75 and ZnO-C-1. ZnO-C-0.5 showed excellent dye degradation efficiency under visible light and followed by ZnO-C-0.75, ZnO-C-0.25 and ZnO-C-1 with a degradation efficiency of 63.45, 58.49, 47.97 and 47.31% respectively. In addition to this ZnO-C-0.5 exhibited enhanced photostability and reusability. The antibacterial and antibiofilm activity of ZnO-C NPs were studied by using Staphylococcus aureus and Pseudomonas aeruginosa bacterial species. At 10 µg/L, ZnO-C-0.5 showed 100% inhibition of both the bacterial species. The increase or decrease in carbon ratio decreased the photocatalytic efficiency and antibacterial and antibiofilm effect. The presence of carbon enhanced the antibacterial and antibiofilm effects and ZnO-C-0.50 exhibited highest activity.

    更新日期:2019-12-11
  • Influence of ZnO Nanoparticles on Mechanical Properties and Photocatalytic Activity of Self-cleaning ZnO-Based Geopolymer Paste
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-12-02
    Siti Norsaffirah Zailan, Aissa Bouaissi, Norsuria Mahmed, Mohd Mustafa Al Bakri Abdullah

    The influence of zinc oxide (ZnO) nanoparticles on the mechanical properties and photocatalytic degradation of methylene blue (MB) of ZnO-based geopolymer material was investigated under the illumination of ultraviolet (UV) radiations. In this work, ZnO-based geopolymer paste was manufactured using class F fly ash (FA) and ZnO nanoparticles powders with different mass percentages (0, 2.5, 5.0, 7.5 and 10 wt%). The FA-ZnO dry mix was activated by alkaline activator solution made from sodium silicate and sodium hydroxide with a ratio of 2.5. The mechanical properties were investigated by performing a compressive strength test at 28 days. The photocatalytic activity of ZnO nanoparticles was evaluated by measuring the photodegradation level of methylene blue under sunlight rays. The results showed a substantial influence of ZnO on the compressive strength, which decreased with the increase of ZnO amounts ranging from 2.5 to 7.5 wt% then a slightly increased at 10 wt% of ZnO. The addition of ZnO nanoparticles to a geopolymeric material showed a satisfactory efficiency of photocatalytic degradation of methylene blue after 150 min of exposure to sunlight. Phase analysis revealed that the addition of ZnO nanoparticles in the geopolymeric system develops a new ZnO crystalline phases.

    更新日期:2019-12-11
  • Synthesis and Characterization of a Large-Sized π-Conjugated Copper(II) Complex Nanosheet
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-11-30
    Yurong Liu, Zhiyuan Xie, Wai-Yeung Wong

    Inspired by the flexibility of the bottom-up approach in choosing building blocks of two-dimensional (2D) materials, a π-conjugated metal complex nanosheet (HHTP-Cu) was successfully prepared by the coordination of the ligand 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP) and Cu(II) ion at the water/oil interface. Field-emission scanning electron microscopy disclosed the large-size domain and transmission electron microscopy revealed the sheet morphology of the nanosheet. The flat and smooth surface was also confirmed by atomic force microscopy which further demonstrated the proposed structure. Energy dispersive X-ray spectroscopy was applied to verify the homogeneous distribution of the elements while X-ray photoelectron spectroscopy was used to investigate the composition of the nanosheet.

    更新日期:2019-12-11
  • Enhanced Antifungal Activity of Pure and Iron-Doped ZnO Nanoparticles Prepared in the Absence of Reducing Agents
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-11-30
    A. Ferin Fathima, R. Jothi Mani, K. Sakthipandi, K. Manimala, Aslam Hossain

    Pure and iron (Fe)-doped ZnO nanoparticles were synthesized using polyethylene glycol in the absence of reducing agents such as NaOH and ammonia. From XRD patterns, particle sizes pure (33.38 ± 2 nm) and Fe-doped ZnO (27.99 ± 2 nm) were calculated, which were found to be in nanoscale range. XRD patterns of the synthesized samples were refined by the Rietveld method using hexagonal unit cell, and the refinement results for the single-phase samples revealed that the unit cell volume slightly increases by iron doping of ZnO. Antifungal activity of pure and Fe-doped ZnO nanoparticles was observed against three postharvest pathogenic fungi such as Aspergillus niger, Aspergillus flavus and Rhizopus. Iron doping enhances the inhibition zone for all fungal pathogens compared to the pure ZnO nanoparticles. Antifungal activity of the Fe-doped ZnO nanoparticles is comparable with the standard antibiotic mycostatin whose inhibition zone is 18 mm against A. Niger.

    更新日期:2019-12-11
  • HMDS–GPTMS Modified Titania Silica Nanocomposite: A New Material for Oil–Water Separation
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-11-30
    P. K. Jaseela, K. O. Shamsheera, Abraham Joseph

    A simple and feasible method is proposed for the fabrication of a super-hydrophobic coating on cotton fabric via sol–gel process. The wettability of the coating was investigated by water contact angle measurement (WCA). WCA of coated fabric reached up to 161.5 ± 1.02°. The tensile strength and Young’s modulus and mechanical properties of coated fabric is quite promising than uncoated fabric. Moreover, the coated fabric can effectively separate oil–water mixtures through an ordinary filtering process with a separation efficiency of 99%. After 15 cycles of separation the contact angle changes to 155.6 ± 0.98° only and material maintained its super-hydrophobic property. The durability of the coating was evaluated by exposing the specimen at harsh environments like acidic, alkaline, saline, and ultraviolet irradiation was conducted. The tear test was evaluated using the adhesive tape test, abrasion resistance test apart from washing stability and these results suggested that the coating was sufficiently stable. The coated fabric free of fluorine and chlorine can be effectively utilized in various fields.

    更新日期:2019-12-11
  • Ultrasonic Assisted Cerium Oxide/Graphene Oxide Hybrid: Preparation, Anti-proliferative, Apoptotic Induction and G2/M Cell Cycle Arrest in HeLa Cell Lines
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-11-30
    J. Saranya, B. S. Sreeja, G. Padmalaya, S. Radha, T. Manikandan

    In this work, we developed a morphology involved cerium oxide/graphene oxide hybrid (CeO2/GO hybrid) nanocomposite based system using the ultrasonic method. X-Ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM) have been performed to analyse the developed nanocomposite. The crystallite size of the hybrid was found to be 3.86 nm comparably lower than that of pure CeO2 (7.4 nm) which was confirmed by X-Ray diffraction analysis. The presence of functional groups was affirmed using FTIR analysis. The morphological features of pure CeO2 and hybrid were verified using FESEM. FESEM images reveals that, pure CeO2 nanoparticles are highly agglomerated and CeO2/GO hybrid possess nano-rectangular morphology. In addition, the developed hybrid system has been analysed to evaluate its scavenging anti-cancer potential against HeLa cell lines at various concentrations and incubation intervals using antiproliferative assay test. The test results reveals that, as the concentration of hybrid nanocomposite increases the cell death also increases. Here, “IC50” refers to lowest concentration of sample (CeO2/GO hybrid) at which nearing 50% of HeLa cells remains alive and rest of the cells remains dead. In our study, 31.2 µg/ml is considered to be IC50 value for which nearing 50% of cells remains dead and it has been attained at an incubation period of 72 h. An dual acridine orange/ethidium bromide (AO/EB) fluorescent staining, was performed at two specific concentrations (i.e.) 125 µg/ml and 1000 µg/ml of developed hybrid nanocomposite to identify apoptosis-associated changes of cell membranes during the process of apoptosis. Change in color for both live cells (green) and dead cells (red) were viewed using fluorescence microscopy. The quantitative analysis was done using flow cytometry (FACS study) to investigate the cell cycle at which maximum number of HeLa cells has been killed due to interaction with developed CeO2/GO hybrid. The FACS study test results reveals that, maximum cancer cells were arrested at R3 (G2/M) phase. Hence, the developed CeO2/GO hybrid has shown improved anticancer efficacy against HeLa cell line and thus it acts as a better therapeutic agent for cervical cancer diagnosis.

    更新日期:2019-12-11
  • Stability Enhancement of Silver Nanoparticles Through Surface Encapsulation via a Facile Green Synthesis Approach and Toxicity Reduction
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-11-29
    Mahmuda Akter, A. K. M. Atique Ullah, Md. Shiblur Rahaman, Md. Mostafizur Rahman, Md. Tajuddin Sikder, Toshiyuki Hosokawa, Takeshi Saito, Masaaki Kurasaki

    Persuaded by the necessity of reduction of toxicity, silver nanoparticles (Ag-NPs) were synthesized from the reaction between AgNO3 solution and Mizuna (Brassica rapa var. japonica) leaf extract. This study aimed to investigate the role of synthesis temperature on particle properties. Thus, four synthesis-temperatures, 25 °C (room temperature), 60 °C, 80 °C, and 100 °C were applied. Ag-NPs were characterized using ultraviolet–visible (UV–Vis) spectrophotometer, energy dispersive X-ray spectrometer, X-ray diffractometer, transmission electron microscope, atomic absorption spectrometry and dynamic light scattering techniques. The high-temperature (80 and 100 °C) synthesis showed higher stability, demostrated lowest release of silver ion (0.02 µg/mL, 0.002 µg/mL) compared to low-temperature synthesis. In addition, high-temperature synthesis showed higher C-content (> 50%) with lower Ag-content (< 30%) than low-temperature (25 and 60 °C) synthesis. Moreover, a complete surface encapsulation is found on the particles synthesised at 100 °C by TEM analysis. The synthesized Ag-NPs were exposed to Caco-2 cell lines for cytotoxicity assessment. The high-temperature synthesis Ag-NPs exerted significantly lower cytotoxicity in terms of Caco-2 cell viability and lactate dehydrogenase (LDH) activity assay. Upon exposure to 1, 5 and 10 µg/mL Ag-NPs for 48 h the cell viability (96.33%, 90.66% and 89.66%) was not changed for high-temperature synthesis particles as well as the LDH activity was unchanged. However, low-temperature synthesis showed significant cytotoxicity (81%, 66% and 44.33%) under similar experimental conditions. Thus, characterization and cytotoxicity techniques clearly demonstrate the successful synthesis of Ag-NPs with the encapsulation of bio-molecules that enhances the particle stability and reduce cytotoxicity.

    更新日期:2019-12-11
  • DNA Binding, Molecular Docking and Antimicrobial Evaluation of Novel Azo Dye Ligand and Their Metal Complexes
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-11-26
    N. Venugopal, G. Krishnamurthy, H. S. Bhojya Naik, J. D. Manohara

    In the present work, the synthesis of novel azo dye ligand 6-hydroxy-4-methyl-2-oxo-1-propyl-5-[(E)-1,3-thiazol-2-yldiazenyl]-1,2-dihydropyridine-3-carbonitrile (L) and its Cu(II), Co(II) and Ni(II) transition complexes were prepared. The newly formed compounds were characterized by elemental analysis, UV–Vis, FT-IR, 1H NMR, LC–MS, TGA and magnetic susceptibility measurement. The molar conductance indicates that all the metal complexes are non-electrolytic in nature Based on spectral data indicate square planar geometry was deduced for Cu(II) and Ni(II) complexes, Co(II) complex has tridentate chelation of ligand and produce an octahedral geometry around the metal ion. Additionally, the computational study has been performed using density functional theory (DFT) calculation was used to study the electronic structure of synthesized ligand and their complexes. The in vitro antimicrobial activity of the azo dye ligand and its complexes was tested against Gram +ve bacteria (Bacillus subtilis), Gram –ve bacteria (Escherichia coli), yeast (Candida albicans) and fungus (Aspergillus flavus). All the complexes showed enhanced biocidal activity compared to the free ligand. Moreover, azo dye ligand and its metal complexes have been studied for their antioxidant activity. The DNA-binding activity of metal complexes (1a–1c) was studied by electronic absorption spectroscopy and fluorescence spectroscopy. All the complexes bound to CT-DNA through an intercalation mode. Additionally, all the metal complexes act as good cleavage agents against the pBR322 DNA. The computer-aided molecular docking studies of metal complexes with the receptor of GlcN-6-P synthase showed that metal complexes are potent drugs for the target enzymes.

    更新日期:2019-12-11
  • In-Situ Synthesis of a Novel Bioresorbable Sodium Alginate/Hydroxyapatite–Calcium Pyrophosphate Nanocomposite as Bone Replacement
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-11-25
    Esmaeil Salimi

    The aim of this study was to develop a new bioresorbable nanocomposite for bone defect treatment. Despite different orthopaedic applications of hydroxyapatite (HA), the slow resorption rate and the instability of HA particles have limited its performance in some particular applications. Therefore, a novel hydroxyapatite–calcium pyrophosphate (HA–CPP)/Alginate nanocomposite was synthesized in this study using the chemical precipitation method. X-ray diffraction pattern indicated the presence of HA and CPP crystals in the composite. Transmission electron microscopy images also showed a combination of nano-size particles with different morphologies. Evaluation of the stability of the prepared samples under physiological condition revealed that the resorption rate was raised by increasing the content of calcium pyrophosphate in the composite. The obtained new composite, which contained the metastable CPP phase, could be the prospective biomaterial for bone replacement.

    更新日期:2019-12-11
  • Two Series of Lanthanide Coordinated Compounds and Novel Three-Component Near-White Light Emission
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-11-25
    Ling-yun Xin, Feng-yang Ju, Yun-ping Li, Xiao-ling Li, Guang-zhen Liu

    Two series of coordinated compounds [Ln2(TZI)2(H2O)10]n·4H2O (Ln = Er (1), Yb (2), Dy(3), (H3TZI = 5-(1H-tetrazol-5-yl)isophthalic acid) and [Ln(TZI)(H2O)4]n·3H2O (Ln = Ho (4), Eu(5) and Sm (6)) were hydrothermally synthesized by different reaction conditions. Compounds 1–3 are isostructural and show a dinuclear motif, which further develop into a 3D H-bonding supra-molecular structure, and compounds 4–6 are also isostructural and have a 1D ladder-typed chain, which further interlinked into a 3D supra-molecular architecture by H-bonding interactions. Furthermore, the fluorescent properties of compounds 3–6 exhibit intense emissions corresponding to blue-violet (3 and 4), red (5) and orange red (6), respectively. By way of the careful regulation of the relative intensity of the blue-violet (4), green (Tb) and orange red (6) emissions, a novel three-component white-light emission (Ho–Sm–Tb) has been realized.

    更新日期:2019-12-11
  • Stabilization and Dispersion of ZnO Nanoparticles in PVA Matrix
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-11-23
    Ananya Barman, Ayan De, Mahuya Das

    In the present work ZnO nano particles have been synthesized and stabilized by polyvinyl alcohol, PVA, under in situ and ex situ condition and focused on the effect of reaction conditions on the stabilization and dispersion of ZnO nano particles in PVA. From particle size analysis it is evident that, the rate of agglomeration is slower for ex situ synthesis method. It was also observed that the peak has shifted towards lower diameter value of the nano particles. The synthesis of ZnO nano particle has further been established with UV–VIS peak at around 350 nm and morphology study by FESEM study. EDAX spectra exhibited that weight percent of ZnO NP formed is around 2.5%. Dynamic mechanical study and thermal study was also made with the samples. It has been observed that mechanical property under dynamic condition is better with ex situ samples and storage modulus is 1.7 times higher than the in situ sample. Thermal property of PVA has been improved with composite formation as the percent char has been increased in case of composites.

    更新日期:2019-12-11
  • Green Synthesis of Silver Nanoparticles from Leaf Extract of Nyctanthes arbor - tristis L. and Assessment of Its Antioxidant, Antimicrobial Response
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-11-23
    Awadhesh Kumar Mishra, Kavindra Nath Tiwari, Rajesh Saini, Pradeep Kumar, Sunil Kumar Mishra, Virendra Bahadur Yadav, Gopal Nath

    The UPLC-Q-TOF–MS/MS analysis of ethanol extract of leaf confirmed the presence of important flavonoids like rutin (RT 5.95), hesperidin (RT 5.99), quercitrin (RT 6.33) and kaempferol-3-O-glucoside (RT 6.82). Photo-induced green synthesis of silver nanoparticles was reported in Nycanthes arbor-tristis. Nanoparticles were efficiently synthesized after mixing of 1% ethanol leaf extract and 1 mM silver nitrate solution under 10 min light exposure at room temperature. The UV–Vis spectrum of the brown colored reaction mixture showed sharp surface plasmon resonance at 460 nm. It confirmed the biosynthesis of silver nanoparticles. Nanoparticles were characterized by using SEM, TEM, and EDX. The results suggest that synthesized nanoparticles lie in the range of 10–50 nm. XRD, SAED and AFM data confirmed the polycrystalline nature of biosynthesized nanoparticles. Silver nanoparticles exhibited strong antibacterial activity than extract. All bacterial clinical isolates were sensitive to nanoparticles. Methicilin resistant Staphylococcus aureus was most susceptible than other isolates. The silver nanoparticles also exhibited good free radical scavenging activity (EC50 670.67 ± 15.70 µg/ml).

    更新日期:2019-12-11
  • Electrochemical Measurement of Bismuth Clusters in Dendrimer Through Transformation from Atomicity Controlled Complexes
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2019-11-21
    Tetsuya Kambe, Shotaro Imaoka, Risaki Hasegawa, Takamasa Tsukamoto, Takane Imaoka, Keisuke Natsui, Yasuaki Einaga, Kimihisa Yamamoto

    Dendrimers can provide unique reaction space for sub-nano sized materials. Recently, we have demonstrated a luminous bismuth dendrimer and the on/off switching by stepwisely assembled bismuth units in a phenylazomethine dendrimers. In addition, formation of bismuth clusters was also demonstrated by the reduction of the bismuth salts assembled in the dendrimer. In this study, we have revealed the atomicity dependency about the reduction and oxidation potentials of the assembled bismuth complexes and clusters, respectively. The measurements were conducted by the electrochemical process of the bismuth assembled dendritic poly-phenylazomethines.

    更新日期:2019-12-11
  • Patterning of Protein/Quantum Dot Hybrid Bionanostructures.
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2013-04-02
    Vikas Nandwana,Rubul Mout,Yi-Cheun Yeh,Stefan Dickert,Mark T Tuominen,Vincent M Rotello

    Here we demonstrate patterning of protein/quantum dot hybrid bionanostructures via electrostatic assembly of engineered negatively charged fluorescent protein with positively charged CdSe/ZnS QD patterns formed through e-beam lithography and post-patterning modification with cationic ligands.

    更新日期:2019-11-01
  • Structures and Stabilities of the Metal Doped Gold Nano-Clusters: M@Au10 (M = W, Mo, Ru, Co).
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2014-03-13
    Delwar Hossain,Charles U Pittman,Steven R Gwaltney

    The structures and stabilities of a series of endohedral gold clusters containing ten gold atoms M@Au10 (M = W, Mo, Ru, Co) have been determined using density functional theory. The gradient-corrected functional BP86, the Tao-Perdew-Staroverov-Scuseria TPSS meta-GGA functional, and the hybrid density functionals B3LYP and PBE1PBE were employed to calculate the structures, binding energies, adiabatic ionization potentials, and adiabatic electron affinities for these clusters. The LanL2DZ effective core potentials and the corresponding valence basis sets were employed. The M@Au10 (M = W, Mo, Ru, Co) clusters have higher binding energies than an empty Au10 cluster. In addition, the large HOMO-LUMO gaps suggest that the M@Au10 (M = W, Mo, Ru, Co) clusters are all likely to be stable chemically. The ionization potentials and electron affinities for these clusters are very high, and the W@Au10 and Mo@Au10 clusters have electron affinities similar to the super-halogen Al13.

    更新日期:2019-11-01
  • Binding of Cobaltocenium-containing Polyelectrolytes with Anionic Probes.
    J. Inorg. Organomet. Polym. Mater. (IF 1.637) Pub Date : 2017-11-04
    Parasmani Pageni,Mohammad Pabel Kabir,Peng Yang,Chuanbing Tang

    Cationic cobaltocenium-containing polyelectrolytes have a unique ability to form ionic complex with various anionic species. We carried out two sets of model study to compare the relative binding strength of a cobaltocenium-containing polyelectrolyte. First, the nature and relative strength of intermolecular interaction between cobaltocenium-containing polyelectrolytes and different anionic probes were investigated by spectroscopic methods. A dye-displacement method was used to monitor absorbance and fluorescence emissions. Second, the binding strength of this cobaltocenium-containing polyelectrolyte was compared with a classical quaternary ammonium polymer. Formation of polyelectrolyte complex between the cobaltocenium-containing polyelectrolyte and a common anionic polyelectrolyte at various concentrations was examined by optical absorption and light scattering.

    更新日期:2019-11-01
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