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  • 更新日期:2020-01-16
  • Three-dimensional hollow NiO/NC nanoparticles for high-performance lithium ion batteries
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-16
    Qiu-yan Zhang; Fen-jun Liu; Ping-an Gao; Peng Zhao; Hong-xia Guo; Li Wang; Zeng Li Wan
    更新日期:2020-01-16
  • Microwave irradiation assisted rapid growth of ZnO nanorods over metal coated/electrically conducting substrate
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-16
    Sanjaya Brahma; S.A. Shivashankar

    In-spite of intense research in the growth of ZnO over the years, the direct crystallization of ZnO on a metal coated/electrically conducting substrate by a solution growth process has not been carried out. We report one pot, low temperature (≤100 °C) and rapid growth (5 min) of ZnO nanorods over an electrically conducting substrate by using microwave irradiation assisted thin film deposition in a liquid medium without the use of any seed layer. High density (2×109/cm2), c-axis oriented, uniform and continuous ZnO nanorod films are grown over Cr/Si [chromium coated Si(100)] and ITO/glass (indium tin oxide coated glass) substrates whereas aluminium (Al) and gold (Au) coated Si yield non uniform film with mixed texture. Microwave irradiation for 5 minutes ensures strongly oriented growth of ZnO over Cr/Si and ITO/glass and mixed texture for semiconducting substrates (Si/Ge). The initial nucleation of ZnO nanorods may be due to the formation of thin amorphous oxide (Cr2O3) layer over Cr film, which subsequently changes to hydroxides (CrOH2, CrOH3) in contact with water.

    更新日期:2020-01-16
  • Facilely self-assembled MnS/S-doped reduced graphene oxide network with enhanced performance for potassium-ion battery
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-16
    Pengyu Han; Yun Zhao

    A MnS nanoparticles/S-doped reduced graphene oxide (MnS/S-rGO) network is prepared via a facile selfassembly method, and then the MnS-based anode material of potassium-ion batteries is investigated for the first time. The two-pronged strategy that the construction of a perforative 3D graphene skeleton and the robust MnS-enclosed configuration by the graphene wrinkles result in favorable structural stability and fast e-/K+ transfer kinetics. The MnS/S-rGO electrode exhibits stable reversible capacity of 215 mAh g-1 after 70 cycles and high rate capacity retention of 41.6% at 1 A g-1. In addition, the ex-situ XRD analysis verifies the high reversibility of the electrochemical redox reactions of MnS, demonstrating the featured bifunctional structure design is rational toward high-quality K+ storage.

    更新日期:2020-01-16
  • Self-catalysis Synthesis of Co3O4@SiO2-Ag Nanocapsules under Near-Neutral Condition as Excellent Performance Catalyst
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-15
    Yu Chen; Zhenhui Li; Fang Cui; Qinghai Ma; Jiajia Zhang; Xulin Xu; Zhiyi Chai; Tieyu Cui

    A degradation of organic dyes catalyst with stable structure and efficient performance, SiO2 coated Co3O4 and Ag nanocapsules have been successfully prepared by the simple in-situ method and template method, which shown excellent catalytic performance for degrade methyl orange dye in solution. The degradation rate constant (k) of Co3O4@SiO2-Ag was 0.150 min-1. The combination of two metals and the hollow mesoporous structure significantly improved the catalytic performance of the material.

    更新日期:2020-01-15
  • Investigation of electrochemical performance of a high surface area mesoporous Mn doped TiO2 nanoparticle for a supercapacitor
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-15
    Devi Prashad Ojha; Milan Babu Poudel; Han Joo Kim

    In the present study, mesoporous Mn doped TiO2 (Mn-TiO2) was synthesised by a simple sol-gel followed by solvothermal method. Brownish white powder is further characterised to confirm the synthesis of 40-50 nm sized high surface area mesoporous Mn-TiO2 nanoparticle. The electrochemical study by using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) revealed nearly 2-fold enhancement of capacitance and the carrier density compared to the pure TiO2 nanoparticle. This enhanced electrochemical property could be mainly ascribed to larger surface area, mesoporous structure and appropriate concentration of Mn doping that altered the optoelectronic properties of wide band gap TiO2.

    更新日期:2020-01-15
  • Crystal facet engineering of single-crystalline anatase TiO2 nanosheets with exposing dominate (010)-facet
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-14
    S. Nithiananth; S. Harish; J. Archana; M. Navaneethan; M. Shimomura

    While most anatase TiO2 crystals reported were in the form of nanoparticle, herein the tuneable and controlled (010)-faceted anatase phase were grown directly onto a conductive substrate. F- ions provided by addition of ammonium hexafluorotitanate (AHFT) play a synergistic effect in the crystals phase changed from rutile to anatase during crystal growth with low-index facets. The morphological transformation from vertically-aligned rutile-nanorods to highly crystalline anatase-nanosheets bounded with the most significant percentage of (001) facets with the effect of F- ions. At higher concentration of AHFT dominate the (010)-faceted anatase TiO2 with suppression of (001) facets of nanosheets (side length of 1.4 µm), which can suppress the charge recombination for an electron transport layer in solar cell applications, and thus, efficient charge transportation can be achieved compared to nanoparticles.

    更新日期:2020-01-14
  • Mechanical properties of Al3BC by nanoindentation and micropillar compression
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-14
    Yongfeng Zhao; Arun Sundar S. Singaravelu; Xia Ma; Xiangfa Liu; Nikhilesh Chawla

    Mechanical properties of Al3BC are still not sufficiently investigated yet for its synthesis difficulties. In this work, the mechanical properties of single-crystal Al3BC were experimentally measured through nanoindentation and micropillar compression for the first time. The hardness, modulus and compression strength were measured to be 24 GPa, 332 GPa and 8.7 GPa, respectively. The high mechanical properties of Al3BC are one prerequisite for it as the reinforcement of Al alloys. This work is expected to have a profound significance for the design and optimization of Al3BC/Al composites.

    更新日期:2020-01-14
  • Decoration of ZnO needles with nanoripples using gas cluster ion bombardment
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-14
    Vasiliy Pelenovich; Xiaomei Zeng; Rakhim Rakhimov; Wenbin Zuo; Canxin Tian; Dejun Fu; Bing Yang

    Ar1000+ clusters accelerated by a voltage in the range of 10-15 kV were used to fabricate self-assembled nanoripples on the surface of ZnO needles. The influence of the cluster accelerating voltage and the lateral size of the needles on the ripple formation were studied. The nanoripples formed on a large surface of a needle resemble eolian sand ripples, whereas, those formed on the needle edges or thin needles demonstrate well-ordered ribbed structures.

    更新日期:2020-01-14
  • Effect of laser surface re-melting on the microstructure and properties of Zr alloy
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-14
    P.F. Ji; B. Li; S.G. Liu; B.H. Chen; X.Y. Zhang; M.Z. Ma; R.P. Liu

    The effects of laser surface re-melting (LSR) on the mechanical and corrosion properties of Zr-5Ti are investigated. After LSR, the microstructure of the alloy-surface has a finer phase-structure and higher density of grain boundaries. Furthermore, the surface hardness of the Zr-5Ti alloy improves significantly due to grain refinement. With increasing distance from the surface, the hardness decreases gradually because the laths coarsen gradually. Corrosion resistance after LSR also clearly improves due to grain refinement, which also reduces the pitting corrosion sensitivity of the alloy. The generated passivation film of the laser-treated alloy and substrate is also analyzed in this paper using X-photoelectron spectroscopy.

    更新日期:2020-01-14
  • 更新日期:2020-01-14
  • Self-assembled three-dimension flower-like nickel hydroxide synthesis with one-pot hydrothermal method for electrochemical applications
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-13
    Yuansheng Wu; Yaoyao Yang; Bingfa Liu; Mengzhu Hu; Xiao Min; Yuheng Wu; Zongjian Liu; Lixin Yu

    Self-assembled flower-like nickel hydroxide was obtained by adding a small amount of (NH4)6Mo7O24·4H2O (NMH) in the hydrothermal process. The research mainly focuses on the influence of NMH on the structure and phase composition of nickel hydroxide. As the electrode material of supercapacitor, the electrochemical performance of the products obtained by adding NMH is significantly improved, showing higher specific capacitance and better cycling performance. The specific surface area and electrochemical properties of conducts reach the 218.66 m2g-1 and 1111.3 F g-1 at 1 A g-1, respectively. The prepared samples also show excellent cycle performance (after1000 cycles, 90.4% capacitance retention) and prominent multiplier performance (720 F g-1 at 20 A g-1).

    更新日期:2020-01-14
  • Enhancing interface bonding strength of Ti-ZrO2 joints using graphene as brazing materials
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-13
    Yong Xian; Xiaoshan Zhang; Yichao Ding; Jing Wang; Hongyuan Huang

    Ti-ZrO2 joints with a graphene sponge interlayer were prepared and the interface bonding was characterized by three-point flexural strength. Compared with direct Ti-ZrO2 jointing showing a formation of monoclinic TiO2 and ZrTiO4 at interface and a negligible bonding, interfacial strength of Ti/graphene sponge/ZrO2 joints has been significantly increased up to 48.5±7.0 MPa without any new interfacial phase formation. The enhanced interface bonding can be ascribed to the preferred interstitial diffusion of carbon atoms originated from the decomposition of graphene sponge interlayer at high temperature. The carbon diffusion reduces the available interstitials and vacancies for Ti, O and Zr diffusions, which retards the interdiffusion between titanium and zirconia, achieving a preferred diffusion bonding to enhance the strength of Ti-ZrO2 joints.

    更新日期:2020-01-13
  • The precipitation control of grain boundary M23C6 phases and the ductility improvement in aged 22Cr-25Ni-WCuNbN austenitic stainless steel by Co addition
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-13
    Lan Wang; Xudong Fang; Jian Wang; Zhuxia Zhang

    Addition of 5 wt% Co to 22Cr-25Ni-WCuNbN austenitic stainless steel resulted in a precipitation inhibition of M23C6 phases along the grain boundary and a large fraction of high angle grain boundaries after aging treatment. Co-added steels showed better ductility than the alloys without Co addition, due to the control of grain boundary M23C6 phases.

    更新日期:2020-01-13
  • Plasma deposited APTES: a potential film for biomedical application
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-13
    Zilin Chen; Junjie Zhao; Chen Jin; Yidie Yuan; Yongping Zhang; Michaël Tatoulian; Xi Rao
    更新日期:2020-01-13
  • Aligned Biomimetic Scaffolds based on Carbon Nanotubes-reinforced polymeric nanofibers for knee meniscus tissue engineering
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-13
    Thiago D. Stocco; Eliane Antonioli; Maria L. Romagnolli; Gustavo F. Sousa; Mario Ferretti; Anderson O. Lobo

    Many strategies in tissue engineering have been developed in order to provide potential treatments for Knee meniscal injuries since it is a high incidence lesion and without effective treatment available in clinical practice. The success of this approach is directly related to the creation of a scaffold able to reproduce the complex extracellular matrix of the native meniscus with adequate mechanical properties. Here we fabricated an aligned biomimetic scaffold, based on carbon nanotube (CNT)-reinforced polymeric nanofibers. For that, scaffolds with both circumferentially and radially aligned polycaprolactone fibers were developed from a specific electrospinning setup and incorporated with two different concentrations of CNT: 0.05% and 0.10%. Characterization by scanning electron microscopy confirmed the spatial distribution and the alignment of the electrospun nanofibers as well as a decrease in average fiber size with the addition of CNT (the presence of CNT was confirmed by transmission electron microscopy). Dynamic mechanical analysis and biological assays showed an improvement in the mechanical properties related to increased CNT content without influence in mesenchymal stem cells survival. These findings suggest a potential applicability of this nanocomposite for knee meniscus tissue engineering.

    更新日期:2020-01-13
  • A facile methodology to make the glass surface superhydrophobic
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-13
    Nidchamon Jumrus; Thanakorn Chaisen; Atchara Sriboonruang; Arisara Panthawan; Tewasin Kumpika; Ekkapong Kantarak; Pisith Singjai; Wiradej Thongsuwan
    更新日期:2020-01-13
  • Novel direct dual-Z-scheme ZnO-Er2O3-Yb2O3 heterostructured nanocomposite with superior photocatalytic and antibacterial activity
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-13
    Tauseef Munawar; Sadaf Yasmeen; Altaf Hussain; Muhammad Akram; Faisal Iqbal
    更新日期:2020-01-13
  • A metal lift-off process through hyperbolic undercut of laser heat-mode lithography
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-13
    Zhengwei Wang; Kui Zhang; Guodong Chen; Zhendong Zhu; Yang Wang; Jingsong Wei

    Laser heat-mode lithography is an important method for the fabrication of micro and nanostructure. A metal lift-off method through hyperbolic undercut of laser heat-mode lithography was proposed. In this method, a desirable hyperbolic undercut profile was used to replace the inverted trapezoid undercut, and the hyperbolic undercut profile can be obtained through laser heat-mode lithography technique. Cr structures of gratings, grids and planar spiral inductor with a minimum linewidth of 0.42 μm and a height of 100 nm were obtained successfully. These indicate that the lift-off process through hyperbolic undercut of laser heat-mode lithography can be used to fabricate the submicron metal structures.

    更新日期:2020-01-13
  • Fatigue response of ultrasonically welded carbon/Elium® thermoplastic composites
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-13
    Somen K Bhudolia; Goram Gohel; Leong Kah Fai; Robert J. Barsotti

    Current research aims at investigating the fatigue strength of ultrasonically welded composite joints with novel liquid acrylic thermoplastic Elium®. Fatigue response of the welded joints with integrated Energy Director (ED) and flat Elium® film was investigated and the baseline comparison was carried out with control adhesives. The results showed 10-12% higher fatigue life at 105 and 106 fatigue cycle as compared to the adhesively bonded joints. Fractographic investigation of fractured welded joints showed features such as fibre impingement and shear cusps formation which contributed to strong interfacial adhesion.

    更新日期:2020-01-13
  • Preparation of natural pyrethrum-polylactic acid microspheres with different particle sizes and surface morphology
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-13
    Yan Li; Duo Cao; Feng-an Jia; Fan Chang; Rui Lv; Jia-kun Dai

    Controlled-release technology has been widely studied in the field of medicine, but it is rarely used in pesticides. The objective of this study was to obtain pyrethrin-polylactic acid microspheres with different particle sizes and morphologies. By adjusting the concentration of polylactic acid and the rotation speed, a series of microspheres can be prepared simply and efficiently by using the single emulsion-solvent evaporation method. The result of laser particle size analyzer showed that the average diameter of the microspheres ranged from 13.5 to 142.4 μm. The FESEM observation revealed that the obtained microspheres were spherical with pores on the surface. And as the particle size decreases, the area of the surface pores becomes larger and shallower. The spectrum of FTIR indicated the presence of pyrethrin in the prepared microspheres.

    更新日期:2020-01-13
  • One-step in situ synthesis of nano silver-hydrotalcite coating for enhanced antibacterial and degradation property of magnesium alloys
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-13
    Yun Zhao; Yangping Chen; Wei Wang; Zhiyu Zhou; Shuxin Shi; Wei Li; Minfang Chen; Ze Li

    The nano-silver/Mg-Al hydrotalcite (Ag-LDH) functional coating was prepared onto magnesium alloy by one-step hydrothermal reaction for improving its antibacterial and degrading property. The properties of coating involving microstructure, composition, in vitro degradation, cytocompatibility and antibacterial were also studied. The results show that the nano silver particles and hydrotalcite coating were in-situ formed from the alloy surface during the reacting process. Additionally, the pH variation and antimicrobial test reveal that the fabricated Ag-LDH coating can effectively suppress the degradation of the matrix and significantly inhibit the proliferation of Escherichia coli and Staphylococcus aureus, which is with great potential to improve functionality and corrosion resistance of biomedical magnesium alloy.

    更新日期:2020-01-13
  • Cyclometallic iridium-based nanorods for chemotherapy/photodynamic therapy
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-13
    Wan Liu; Nan Song; Yuanyuan Li; Yang Liu; Li Chen; Shi Liu; Zhigang Xie
    更新日期:2020-01-13
  • Hierarchical N, S-codoped honeycomb-like porous C@Co9S8@CNTs structure as high-performance microwave absorber
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-11
    Xiaoyu Bai; Lei Wang; Ying Lin

    Herein, a facile method is developed to fabricate hierarchical N, S-codoped honeycomb-like porous [email protected]9S8@CNTs composites, in which the coating length of carbon nanotubes (CNTs) on the surface of comby porous carbon framework could be easily controlled by the addition of cobalt chloride content in precursor. When the addition of cobalt chloride was 0.26 mmol, the longer CNTs with length of 3.1 µm was formed, which induced have significantly on enhancement of the comprehensive microwave absorption properties of hierarchical N, S-codoped honeycomb-like porous [email protected]9S8@CNTs structure. By adding only 10 wt% to paraffin, the resulting composites exhibited a maximum reflection loss of -56.0 dB at 6.5 GHz with 3.4 mm thickness, and the effective bandwidth was 4.64 GHz (5.60-7.76, 15.52-18 GHz). These outstanding microwave absorption properties were ascribed to the stronger dielectric loss by the higher aspect ratio of the CNTs. This work would provide a new direction how to design porous carbon-based microwave absorbers with high performance at low filler loading.

    更新日期:2020-01-13
  • Dual functional modification of gellan gum hydrogel by introduction of methyl methacrylate and RGD contained polypeptide
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-11
    Ji Jiang; Yajun Tang; Hua Zhu; Dan Wei; Jing Sun; Hongsong Fan

    For tissue fabrication and tissue regeneration, three-dimension (3D) hydrogel matrix with both cellular bioactivity and versatile fabrication ability for in-situ cell laden is always challenging and spotlight. In this study, we establish a facile approach to modify gellan gum (GG) for overcoming its disadvantages, including high gelling temperature which is incompatible for in-situ cell encapsulation and the native inactivity for cell adhesion. By esterification reaction, methacrylic anhydride modified GG (MAGG) is prepared, producing photo-reactivity for crosslinking and grafting with RGD-contained peptides. Therefore, RGD-grafted hydrogel (MAGG-RGD) is feasibly prepared. Detail characterizations show that MAGG hydrogel possesses improved physicochemical properties, with tunable strength varied with MA dose. Moreover, the introduction of RGD domains significantly improves the MG63 cells proliferation, adhesion and spreading both on two-dimension (2D) surface and in 3D matrix. Given the native photo-crosslinkable capacity, tunable physicochemical nature and good bioactivity, MAGG-RGD hydrogel is perspective in tissue fabrication and tissue engineering, and expands the potential material platform for cell carrier or tissue scaffold.

    更新日期:2020-01-13
  • Fabrication of CuCo2S4 nanosheet/carbon cloth as a flexible electrode for high-performance electro-catalysis
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-11
    Jie Yin; Chunyao Zhang; Xingzhong Zhao; Haonan Yu; Yueming Sun; Yuqiao Wang

    CuCo2S4 single crystalline nanosheets were fabricated directly on flexible carbon cloth (CC) substrate by a one-step hydrothermal process. The vertically oriented nanosheets exhibited abundant active sites and low charge transfer resistance, resulting an enhanced electro-catalytic performance to the reduction of I3-. Dye-sensitized solar cells based on CuCo2S4@CC as a counter electrode achieved a high photovoltaic conversion efficiency of 7.68 % versus Pt of 7.39 %. This work provides a feasible approach to designing high-quality two-dimensional ternary chalcogenides for further applications in wearable electronic devices.

    更新日期:2020-01-13
  • Benzoyl peroxide thermo-crosslinked poly(ethylene-co-vinyl acetate) foam with two-way shape memory effect
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-11
    Jin Hui; Hong Xia; Yaqin Fu; Yiping Qiu; Qing-Qing Ni
    更新日期:2020-01-13
  • Activated carbon derived from pitaya peel for supercapacitor applications with high capacitance performance
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-10
    Wenjing Lu; Xiaohua Cao; Lina Hao; Yiping Zhou; Yawei Wang

    In this paper, activated carbon with a high specific surface area up to 1872 m2 g−1 has been prepared from pitaya peel by chemical activation method using KOH solution as an activator. The novel activated carbon exhibits a significantly high specific capacitance of 255 F g−1 at a current density of 1 A g−1 in 6 M KOH, as well as excellent cycling stability with capacity retention of 96.4 % after 5000 cycles at 5 A g−1. Our findings suggest that the biowaste like pitaya peel can be converted into available activated carbon, indicating a low-cost substitute for conventional electrode materials for supercapacitors.

    更新日期:2020-01-11
  • Tailored Fluorescence Traits of Pulse Laser Ablated Gold-Cinnamon Nanocomposites
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-10
    Ali Aqeel; S.K. Ghoshal; G. Krishnan; H. Bakhtiar

    The gold (Au)/cinnamon (Ci) nanocomposite particles (Au-Ci NCPs) were prepared via the pulse laser ablation in liquid (PLAL) technique to customize their fluorescence (FL) characteristics. The morphology, structure and photoluminescence (PL) properties of these NCPs were determined. These ultra-sensitive NCPs (organic-inorganic) with the large surface area revealed a significant fluorescence enhancement and improved surface plasmon resonance (SPR) absorption. The PL spectra of the NCPs showed a prominent stable peak at 436.95 nm with FWHM≈52.87 nm. The observed improvement in the optical properties and chemical structure of the synthesised NCPs are affirmed to be greatly favorable for biomedical applications. Compared to the conventional synthetic drugs, the proposed nontoxic, chemically inert and eco-friendly NCPs with improved FL attributes are expected to be beneficial towards the Au-Ci NCPs enhanced FL-based drug developments.

    更新日期:2020-01-11
  • Limits of grain boundary engineering in nanocrystalline Nd-Fe-B melt-spun ribbons
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-10
    Marko Soderžnik; Bojan Ambrožič; Kristina Žagar Soderžnik; Matic Korent
    更新日期:2020-01-11
  • Characterization of AuNPs based ink for inkjet printing of low cost paper based sensors
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-09
    Mohammed Shariq; Somnath Chattopadhyaya; Rebeka Rudolf; Amit Rai Dixit

    The functionality of an effective metal NPs based ink in inkjet printing depends on its ability to achieve high mass concentration as well as suitable rheological properties for stable printability. In this work, AuNPs synthesized by USP were successfully formulated in inks of varying [Au] using PVP40 as stabilizer and DI water as solvent. The influence of the increasing [Au] on the rheological, flow and wetting behavior were investigated for requisite printable characteristics. Thermo-physical characterization was carried out on the optimized concentrated AuNPs ink using TGA, DLS, SEM and EDX techniques.

    更新日期:2020-01-09
  • 更新日期:2020-01-09
  • Bioconjugation of Aptamer to Fluorescent Trimethyl Chitosan Nanoparticles for Bacterial Detection
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-09
    Xueqin Zhao; Chao Lu; Songlin Yang; Jin Zhang

    Trimethyl chitosan nanoparticles (TMC NPs), the positively charged chitosan derivative, have been used to deliver medicines to overcome the tissue barrier. Here, fluorescein-labeled TMC NPs were produced by a microemulsion method following the bioconjugation of the single-strand DNA aptamer which can specifically bind to E. coli (DH5α). TMC NPs show uniform spherical particles with an average diameter of 323±10 nm. The large positive zeta potential, 37.1 ± 2.2 mV, indicates the net positive charged surface of TMC NPs which is a suitable carrier for crossing tissue barriers. The linear relationship of the maximum fluorescence intensity of aptamer modified TMC NPs and the concentration of E. coli (DH5α) is obtained. We hope that the fluorescent TMC NPs integrating with a suitable aptamer could be used to understand the pathway of bacteria crossing the host barrier to fight against invasive infections.

    更新日期:2020-01-09
  • A reinforced-concrete-like ultrathick cathode supported by carbonization kapok fibers for high loading lithium sulfur batteries
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-09
    Jun Ma; Xin xiu Yan; Huan Zhang; Mei zhen Qu; Zhi kai Wei

    It’s a focus on high sulfur loading electrode for lithium sulfur batteries (LSBs) to improve the practical energy density. Blade casting method is an ideal method due to its efficiency and convenience that means thick electrode was utilized to increase sulfur loading. However, the weak strength and sluggish kinetics hinder to improve the practical energy density. To overcome issues, carbonization kapok fibers (CKFs) were overlapped to form the percolation network like rebar in the reinforced concrete. The cathode (sulfur loading: 8.22 mg cm -2) exhibits the superior initial capacity (1090 mAh g-1 at 0.1C) and cycling performance (728 mAh g-1 after 80 cycles).

    更新日期:2020-01-09
  • Magnetic properties of Mo-doped TiO2 nanoparticles: a candidate for dilute magnetic semiconductors
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-09
    S. Ravi; F. Winfred Shashikanth

    Emerging for future electronics, magnetic semiconductors have opened up the interest due to the preservation of both magnetic and semiconducting properties leading to multifunctional capabilities. Dilute magnetic semiconductors are one such candidate, yet it is challenging to have room temperature ferromagnetism with high Curie temperature. In this letter, we report the synthesis and characterization of pure and Mo-doped TiO2 nanoparticles (0.5% and 1%) in the anatase phase. Pure TiO2 shows diamagnetic nature. In comparison, Mo-doped TiO2 has a high Curie temperature of 400 K and exhibits room-temperature ferromagnetism (FM) due to the overlapping and hybridization of Mo 4d and O 2p orbitals. Thus, Mo-doped TiO2 can be considered as dilute magnetic semiconductors (DMS) in future electronics.

    更新日期:2020-01-09
  • Grain boundary engineering to overcome temper embrittlement in martensitic steel
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-09
    Kirtiratan Godbole; C.R. Das; S.K. Albert; Bharat B. Panigrahi

    Grain boundary engineering (GBE) approach has been introduced in martensitic steel through quenching and partitioning (Q&P) heat treatment to overcome temper embrittlement. This heat treatment increases fraction of low energy coincidence site lattice (CSL) boundary from 0.12 in Q&P specimen to 0.22 in Q&P-tempered specimen through transformation of retained austenite to martensite. Presence of austenite in martensitic matrix produces different interfaces. Low energy austenite/austenite and austenite/martensite interfaces reduces segregation of tramp elements during tempering leading to increased toughness compared to normalized and tempered specimen having high energy martensite/martensite interface. Increased toughness is accompanied by a change in fracture morphology from intergranular fracture to typical dimple fracture.

    更新日期:2020-01-09
  • Enhanced corrosion resistance and biocompatibility of magnesium alloy by hydroxyapatite/graphene oxide bilayer coating
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-09
    Feng Peng; Dongdong Zhang; Donghui Wang; Lidan Liu; Yu Zhang; Xuanyong Liu

    Fast degradation is the major limitation for biomedical application of Mg alloy. In the current work, a bilayer coating (HA/GO#) with hydroxyapatite as the inner layer and graphene oxide as the out layer was prepared on AZ31 alloy. Graphene oxide could sufficiently inhibit the formation and growth of corrosion cracks on hydroxyapatite layer, which result in its superior corrosion resistance. In vitro cell viability results suggested that MC3T3-E1 cells exhibited larger spreading area on HA/GO# coating at the initial 4 hours of incubation. Furthermore, cells on HA/GO# coating showed superior proliferation rate. Considering its satisfied corrosion resistance and biocompatibility, the as prepared bilayer coating on AZ31 alloy is promising for clinical application.

    更新日期:2020-01-09
  • In-situ observation of interaction between dislocations and carbon nanotubes in aluminum at elevated temperatures
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-09
    B. Chen; K. Kondoh; J. Li

    In this study, in-situ high-temperature transmission electronic microscopy is performed to investigate the formation mechanism of high-fraction (>50%) low-angle grain boundaries (LAGBs) in carbon nanotubes/aluminum (CNTs/Al) composites with balanced strength and ductility. During heating up the low-temperature-sintered composite, we find that dislocation bands first moves and then they are pinned by CNTs to form LAGBs. Abundant dislocations in the Al matrix and large-aspect-ratio CNTs are clarified as two critical factors for producing LAGBs. This study provides new insight into the effect of CNTs on the microstructural and mechanical properties of metal matrix composites.

    更新日期:2020-01-09
  • Synergistic effects in N-K2Ti4O9/ZIF-8 composite and its photocatalysis degradation of Bisphenol A
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-09
    Cong Shao; Sheng Feng; Guiliang Zhu; Wei Zheng; Jiajia Sun; Xianglin Huang; Ziqiu Ni

    N-K2Ti4O9 and metal organic frameworks (MOFs) have a wide range of application in the field of photocatalysis and adsorption. Here, N-K2Ti4O9/ZIF-8 as visible-light-driven photocatalysts was successfully synthesized by a simple in-situ heterogeneous deposition method. The synthesized samples were characterized by XRD, SEM, TEM(SAED), EDS, Mapping, BET, PL spectra and UV-vis DRS. The photocatalytic performance was investigated through the degradation of Bisphenol A (BPA) under visible-light irradiation within 90 min. The composite exhibited higher photocatalytic activity, as the rate constant (k) for BPA degradation was almost 9 times that of N-K2Ti4O9. The improved photocatalytic activity was mostly caused by the great adsorption capacity of ZIF-8 and high separation efficiency of photogenerated electron-hole pairs through interfaces between N-K2Ti4O9 and ZIF-8. The work is expected to provide new insight into the photocatalytic mechanism for composites, and rationally design and synthesis of highly efficient photocatalysts for environmental application.

    更新日期:2020-01-09
  • Template-mediated growth of tungsten oxide with different morphologies for electrochemical application
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-08
    Zhen Tong; Min Wen; Changqiang Yu; Yanhong Yin; Xianbin Liu; Yesheng Li; Chunfa Liao; Qiulin Zhang; Ziping Wu; Dionysios D. Dionysiou
    更新日期:2020-01-09
  • Analysis and control of Cu6Sn5 preferred nucleation on single crystal (001)Cu
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-08
    H.R. Ma; C. Dong; N. Zhao; Y.P. Wang; X.G. Li; H.T. Ma; J. Chen

    Fully oriented-intermetallic interconnects (FOI) of high melting point and service performance have highly considerable potential application in the current generation of 3D electronic packaging. The primary process of fabrication of this structure is the Cu6Sn5 preferred nucleation. In this article, the orientations of 59 successive Cu6Sn5 grains along the radius of (001)Cu/Sn-3.0Ag solder interface were investigated. Finally, an analysis and control model of Cu6Sn5 preferred nucleation determined by chemical potential gradient of Cu migration was established and applied to address and manage the orientation growth of Cu6Sn5 under different reflow temperature and solder compositions. The results pave the way for orientation controlling of interfacial intermetallics in 3D packaging technologies.

    更新日期:2020-01-09
  • Enhanced AC conductivity and dielectric properties of ultrathin β-silver vanadium oxide/aniline nanowires
    Mater. Lett. (IF 3.019) Pub Date : 2018-01-16
    Samreen Rashid; Qurat ul Ain Javed; M. Hassan Rashid; Dae Joon Kang; M. Khizar Bhutta

    Ultrathin β-silver vanadium oxide nanowires synthesized by electrochemical polymerization of aniline were studied for their alternating current conductivity and dielectric properties. The structural morphology and the size of the hybrid nanowires before and after the adsorption of aniline were analyzed by using X-ray diffractometer, and an inductor–capacitor–resistance (LCR) measurement system. Moreover, electrical characterization was carried out to study the dielectric parameters as a function of frequency between 100 Hz and 5 MHz at room temperature.

    更新日期:2020-01-09
  • Precursor-reforming Protocol to Synthesis of Porous N-doped g-C3N4 for Highly Improved Photocatalytic Water Treatments
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-08
    Huilan Qi; Yanan Liu; Chengyun Li; Xuhui Zou; Yuandong Huang; Yangang Wang

    Graphitic carbon nitride (g-C3N4), a fascinating metal-free polymeric-like material, has gained much interest for environmental remediation. In this work, highly crystalline N-doped g-C3N4 (CN-Im) was synthesized by a simple precursor-reforming and thermal condensation strategy using urea and imidazole (Im) as precursors. The Rhodamine B (RhB) degradation efficiency of optimized photocatalyst is up to 93.5%, almost two times greater than that of bulk g-C3N4 (47%). Such remarkably enhanced photocatalytic activity can be attributed to the synergistic effects of higher specific surface area (105.28 m2 g-1), narrowed band gap (2.72 eV to 2.26 eV), and significantly increased charge transport rate of N-doped g-C3N4.

    更新日期:2020-01-08
  • Cross-Linked Gelatin-Nanocellulose Scaffolds for Bone Tissue Engineering
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-08
    Ingeborg Elisabeth Carlström; Ahmad Rashad; Elisabetta Campodoni; Monica Sandri; Kristin Syverud; Anne Isine Bolstad; Kamal Mustafa

    Wood-based cellulose nanofibrils (CNFs) have, in addition to high specific surface area and high surface reactivity, ability to mimic nanostructured collagen in bone extracellular matrix. These properties make CNFs promising materials for bone tissue engineering (BTE). The CNFs degrade slowly in vivo. By blending and cross-linking gelatin (Gel) with CNFs, scaffolds were produced with tuned degradation rate and enhanced mechanical properties, more suitable for BTE applications. This in vitro study aimed to examine initial biological responses of human bone marrow mesenchymal stem cells to cross-linked Gel-CNF scaffolds. The scaffolds were fabricated from 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-oxidized CNF blended with Gel and cross-linked either by dehydrothermal treatment (DHT) or by a combination of hexamethylenediamine, genipin, and DHT. CNF scaffolds without cross-linking served as control. The produced scaffolds supported cell attachment, spreading, and osteogenic differentiation. However, the early cell attachment after 1 day and the expression of RUNX2 and SPP1 genes after 7 days were highest in the CNF scaffolds. The results suggest that cross-linked Gel-CNF are cytocompatible and holds potential for BTE applications.

    更新日期:2020-01-08
  • Novel aircraft Mg-Y-Gd-Ca alloys with high ignition temperature and suppressed flammability
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-08
    Drahomir Dvorsky; Jiri Kubasek; Dalibor Vojtech; Peter Minarik

    The ban by the Federal Aviation Administration (FAA) of application of magnesium in aircraft cabins was lifted under the condition that the used materials have to fulfill the requirements for the ignition tests. This work proposes the novel Mg-2Y-2Gd-1Ca alloy with a small amount of Y, Gd and Ca as main alloying elements. Superior ignition temperature of 1100°C was determined for this alloy. Analysis of the oxide layers revealed the presence of Y2O3, CaO, Gd2O3, and MgO in oxide layers which were observed to significantly suppress ignition compared to the pure Mg.

    更新日期:2020-01-08
  • Pd Supported on Co@CN Derived from ZIF-67 as Catalyst for Hydrogen Generation from Formic Acid
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-07
    Mengqin Yao; Yuling Ye; Honglin Chen; Xiaoming Zhang

    Hydrogen generation from formic acid(FA)is a promising route in hydrogen energy supply, and catalyst is considered to be the key to this process. Herein, Pd nanoparticles assembled on porous carbon ([email protected]) which derived from ZIF-67, wherein Co species inherited from precursors plays as assistant to adjust the electronic and structure of Pd. In addition, the N atom on the porous carbon skeleton also modified the electronic state of Pd and promoted the anchoring of Pd nanoparticles. The as-synthesized catalyst (Pd/[email protected]) acquired high activity (TOF of 1403 h-1) and stability toward decomposition of FA at 30℃.

    更新日期:2020-01-07
  • Synthesis, characterization and material properties of Titanium Carbide nanocomposite derived from Biochar
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-07
    S.C. Mojaki; Shivani B. Mishra; Ajay K. Mishra

    Titanium carbide was synthesized from biochar, an agricultural waste material. Sol-gel technology was used to develop organic-inorganic hybrid of titania and biochar. The hybrid was carbothermally reduced at a higher temperature of 1450°C in an inert atmosphere. Reduction of as-prepared TiC at different concentrations, resulted in production of khamrabaevite TiC polytypes.The lattice constants obtained for TiC phase in different samples were 0.45964 nm and 0.45112 nm respectively, indicating a decreasing order with increasing contents of Ti- contents.

    更新日期:2020-01-07
  • N/S-doped carbon embedded with AgNPsas a highly efficient catalyst for the reduction of toxic organic pollutants
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-07
    Tansir Ahamad; Mu. Naushad; Sameerah I. Al-Saeedi; Saad M. Alshehri

    In the present study,silver nanoparticles embedded N/S doped carbon ([email protected]) was synthesized by hydrothermal treatment of silver polymer complex. The formation of Ag nanoparticles in the N/S doped carbon (NSC) was confirmedvia UV–Visible, FTIR, XRD, BET, XPS, and TEM analysis. The synthesized [email protected] nanocomposite exhibits excellent catalytic activity for the reduction of 4-nitrophenol(4-NP) into 4-nitrophenol (4-AP) in the presence of NaBH4. The fabricated catalyst show excellent catalytic activities and take only 6 min for the reduction of 4-NP. Furthermore, the highly porosity of carbon retained good activity and stability after five cycles.The foregoing study clearly suggests that synthesis of [email protected] nanocomposite by this method is efficient towards the development of a newer and a novel catalyst.

    更新日期:2020-01-07
  • New negative temperature coefficient ceramics in Ca0.9Y0.1MoO4–CeNbO4 system
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-07
    Yafei Liu; Bo Zhang; Zhilong Fu; Aimin Chang

    The Ca0.9Y0.1CeNbMoO8 compounds are the solid solutions of Ca0.9Y0.1MoO4 and CeNbO4, and have a potential in the high temperature thermistor application. A concept has been proposed to adjust the negative temperature coefficient (NTC) properties of these thermistors by increasing the content of CeNbO4. The structure of as-sintered Ca0.9Y0.1MoO4–xCeNbO4 ceramics is a single Ca0.9Y0.1MoO4 phase at x< 2.5, while the CeNbO4 phase begins to appear at x≥2.5. The thermistor samples have remarkable NTC characteristics in the temperature of 50-700°C. The resistivity, β300/500℃ constant and activation energy all decrease with increasing CeNbO4. The increase of Ce3+ content proved by XPS analysis is the reason for the decrease of the resistivity. The β300/500℃ and Ea values of the NTC thermistors are in the range of 5768-6583K, 0.497-0.568 eV, respectively. After annealing at 500°C in air for 200 h, the coefficient of aging (ΔR/R) is less than 2%, suggesting the materials show excellent stability.

    更新日期:2020-01-07
  • Synthesis of spindle-like CuO nanoparticles by using cathode glow discharge electrolysis plasma
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-07
    Quanfang Lu; Xing Wang; Jie Yu; Feifei Feng; Ling Yin; Yuejing Kang; Hui Luo

    Spindle-like CuO nanoparticles (NPs) were prepared in a single-step approach by using a cathode glow discharge electrolysis plasma (CGDEP) technique with 2.5 g L−1 NaNO3 as an electrolyte and 1.0 g L−1 cetyltrimethylammonium bromide (CTAB) as a stabilizer. When a sufficiently high voltage (> 280 V) was applied, plasma was generated around the Pt needle point cathode. The copper foil anode was gradually consumed and black CuO NPs appeared. The active species formed during the CGDEP process were recorded on an optical fiber spectrometry. The structure and morphology of the CuO NPs were characterized by XRD and SEM. The results showed that spindle-like CuO NPs with the length of 250-350 nm were formed at 300 V discharge voltage.

    更新日期:2020-01-07
  • Unusual combination of conduction and dielectric relaxations in nanocrystalline α-Fe2O3
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-07
    Pulikkathumbayil Muhammed Junais; G Govindaraj
    更新日期:2020-01-07
  • Porous SnO2 triple-shelled hollow nanoboxes for high sensitive toluene detection
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-07
    Tianyi Wang; Haoyan Xu; Yanzhe Wang; Yi Zeng; Bingbing Liu

    A unique triple-shelled architecture with nonspherical shape has been successfully synthesized via a controllable multistep approach in case of polycrystalline SnO2 nanoboxes. The morphological characterizations demonstrate that SnO2 triple-shelled hollow boxes (THBs) are hierarchically constructed by numerous SnO2 primary nanoparticles. The formation mechanism of these SnO2 THBs is discussed based on a localized inside-out Ostwald ripening process. When SnO2 THBs are used as sensing material for toluene detection, the improved sensing performance can be attributed to the rational microstructures for fast transfer of gas molecules.

    更新日期:2020-01-07
  • 更新日期:2020-01-07
  • Preparations of lignin-derived ordered mesoporous carbon by self-assembly in organic solvent and aqueous solution: Comparison in textural property
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-07
    Shuai Wang; Guobao Sima; Ying Cui; Longjun Chang; Linhuo Gan

    Ordered mesoporous carbons (OMCs) were successfully prepared derived from Masson pine alkali lignin using evaporation-induced self-assembly and salt-induced self-assembly, respectively. The two OMCs show obvious differences in textural property including morphology, specific surface surface and mesopore volume.

    更新日期:2020-01-07
  • Differences in surface mechanical properties of Zr-based bulk metallic glass related to stress condition
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-07
    Zhichao Ma; Hongwei Zhao; Xiaoxi Ma; Kaiyang Zeng; Luquan Ren
    更新日期:2020-01-07
  • Electrically conductive honeycomb structured graphene composites from natural protein fibre waste
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-07
    Rechana Remadevi; Md Abdullah Al Faruque; Jizhen Zhang; Maryam Naebe

    A large amount of short and waste protein fibres, including silk and wool generated during fibre processing that is not spinnable, eventually ends up in the landfill. Here we are reporting on using these waste materials for fabrication of conductive composite. We prepared Nickel (Ni) doped textile-based conductive composites from silk, and wool waste fibres in powder forms and graphene oxide (GO), for the first time, by bulk synthesis method. The infrared spectroscopy revealed that the silk and wool formed composites with graphene oxide and Ni. The obtained Ni-doped graphene/protein fibres composites after carbonisation showed a honeycomb structure with high surface area and pore volume. The conductivity of the Ni-doped composites was higher than the undoped composites. Considering the surface area, pore volume and conductivity results, there is a huge potential for the fabricated material from biobased to use as an electrode material.

    更新日期:2020-01-07
  • Nanospherical Cu2O/NiO synthesized by electrochemical dealloying as efficient electrode materials for supercapacitors
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-03
    Yidong Miao; Xuping Zhang; Yanwei Sui; Enyuan Hu; Jiqiu Qi; Fuxiang Wei; Qingkun Meng; Yezeng He; Zhi Sun; Yaojian Ren; Zhenzhen Zhan

    In this study, Cu2O/NiO with nanosphere structure has been successfully synthesized by dealloying a copper foil coated with Zn-Cu-Ni alloy films. First, Zn-Ni films were electrodeposited on copper foil. Next, the Zn-Cu-Ni films were produced by annealing and the Cu2O/NiO was obtained after Zn-dealloying and oxidation. Due to the advantage of the tunable nanosphere structure and dealloying synthesis method, Cu2O/NiO has excellent supercapacitor properties, such as excellent cycling stability (94.5% after 5000 cycles) and high specific capacitance (2255.5 mF/cm2 in 1mA/cm2). These data suggested that this low-cost oxide Cu2O/NiO with nanosphere morphology synthesized by dealloying method could be a promising electrode material for supercapacitors.

    更新日期:2020-01-04
  • A high toughness and light weight armor structure bioinspired design based on a bovine hoof wall
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-03
    Bingfeng Wang; Bingqing Zhou; Xiaoyong Zhang
    更新日期:2020-01-04
  • The Influence of Sintering Temperature on the Microstructures and Electrical Performances of BCZT Ceramics
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-03
    Wenshuo Kang; Zhanshen Zheng; Yuanliang Li; Rujie Zhao

    The effects of sintering temperature (1230-1330℃) on phase composition, microstructure and electrical performance of (Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 samples prepared by sol-gel method were investigated. Increasing sintering temperature could enhance the tetragonal distortion and improve electrical properties. The optimal sintering temperature is 1300℃, and the mechanism of sintering temperature on grain size was explained by the oxygen vacancy theory and the dynamic growth theory of crystal.

    更新日期:2020-01-04
  • Simple one-step synthesis of coil-like cobalt zirconium phosphate microspheres and the application as photocatalyts
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-03
    Xiaoxia Hu; Rong Li; Yanjun Xing

    Novel coil-like cobalt zirconium phosphate microspheres (m-CZPs) were successfully synthesized by a simple one-step and energy-saving method via the microwave-assisted heating. The results showed that the coil-like three-dimensional microstructure of m-CZPs may be caused by the bonding mode of metal ions (cobalt and zirconium) and phosphates. The UV-vis DRS showed that the semiconductors m-CZPs can absorb the light under 300 nm, so the m-CZPs were used as UV-light driven photocatalysts to degrade the methyl blue (MB) under UV light irradiation. The larger SBET and VP were beneficial to the photocatalytic process, thus lead to higher degradation efficiencies of m-CZP60. Moreover, the stability and reusability of m-CZPs were also measured.

    更新日期:2020-01-04
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