显示样式:     当前期刊: Materials Letters    加入关注       排序: 导出
我的关注
我的收藏
您暂时未登录!
登录
  • Piezoelectric and ferroelectric characteristics of P(VDF-TrFE) thin films on Pt and ITO substrates
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-10
    Jeongdae Seo, Jong Yeog Son, Woo-Hee Kim

    Organic P(VDF-TrFE) 70/30 copolymer thin films were fabricated on Pt/Ti/SiO2/Si(111) and ITO/glass substrates at 140 °C using a spin coater. Both P(VDF-TrFE) thin films exhibited ferroelectric β-phase crystallinity, as confirmed by X-ray diffraction analysis. The polarization-electric hysteresis loops of the P(VDF-TrFE) thin films on the Pt and indium-tin-oxide substrates showed high remnant polarizations of 15.5 and 11.8 μC/cm2, respectively. Atomic force microscopy characterization showed rod-like features of the P(VDF-TrFE) thin films on both substrates, where larger rod diameters were observed on the Pt substrate compared to those fabricated on the ITO substrate. Piezoelectric force microscopy measurements further confirmed the superior piezoelectric and ferroelectric properties of the P(VDF-TrFE) thin films on the Pt substrate compared to those on the ITO substrate, which arose from the increased diameter of the rod-like features.

    更新日期:2018-12-11
  • Selective Electron Beam Melting of an Aluminum Bronze: Microstructure and Mechanical Properties
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-10
    Torsten Wolf, Zongwen Fu, Carolin Körner

    In this work, periodic macro-cellular structures with dense struts are successfully fabricated from an aluminum brass by selective electron beam melting (SEBM). The process window for the SEBM of the Cu-Al alloy is developed. The microstructure and the mechanical properties of the Cu-Al samples are studied.

    更新日期:2018-12-10
  • Unique Electromagnetic Loss Properties of Co-doped ZnONanofiber
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-10
    Xiaogu Huang, Siu Wing Or

    In this paper, Co-doped ZnO nanoparticle and nanofiber were prepared by electrospinning method. The results showed that Co-doped ZnO nanofiber performed bead-like fibrous shape and exhibited ferromagnetic properties. The dielectric loss and magnetic loss properties of Co-doped ZnO nanofiber were much better than that of Co-doped ZnO nanoparticle due to the improvement of dipole polarization, interfacial polarization and shape anisotropic. The absorptivity of Co-doped ZnO nanofiber can reach to 70% in the frequency range of 5.3-18 GHz when the coating thickness is 1.5-4.0 mm. It is demonstrated that the bead-like fibrousshape is beneficial to optimize electromagnetic loss and microwave absorption properties of Co-doped ZnO.

    更新日期:2018-12-10
  • Effect of Ca addition on the room-temperature formability of AZ31magnesium alloy
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-10
    U.M. Chaudry, K. Hamad

    In the present work, the high formability of an AZ31 magnesium alloy containing 0.5 wt.% calcium (AZ31-0.5Ca) was explained. The results showed that the intermetallic particles (Mg,Al)2Ca formed due to the calcium addition contributed to the weakening of the basal texture during the primary processing. In addition, due to the strengthening effect of these particles on the basal slip, a higher activity of prismatic slip was observed. Both the weak basal texture and high activity of prismatic slip explained the high formability recorded for this alloy.

    更新日期:2018-12-10
  • Dual-gradient bainite steel matrix composite fabricated by direct laser deposition
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-10
    Yanchuan Tang, Haichao Yang, Daosi Huang, Longzhi Zhao, Dejia Liu, Mingxue Shen, Yong Hu, Mingjuan Zhao, Jian Zhang, Jin Li, Meng Yu

    A dual-gradient bainite steel matrix composite was fabricated by direct laser deposition (DLD) method. The decomposition of WC (reinforcements) during DLD is utilized to adjust the gradient microstructure of the composite. Both the matrix morphology and the reinforcement distribution present obvious gradient variation along the deposition direction. The microhardness and impact toughness exhibit the opposite tendency from the bottom to top of the composite, which shows a good agreement with the gradient microstructure. The surface microhardness and impact toughness of the dual-gradient composite are 510 HV and 75 J/cm2, respectively. The hardness and toughness combination of the composite is superior to most steels for railway frog. The dual-gradient composite has great potential in improving the performance of railway frog.

    更新日期:2018-12-10
  • Innovative adsorbent based on graphene oxide decorated with Fe2O3/ZnO nanoparticles for removal of dipyrone from aqueous medium
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-10
    Murilo Barbosa de Andrade, Ana Carolina Sestito Guerra, Tássia Rhuna Tonial dos Santos, Gustavo Affonso Pisano Mateus, Rosângela Bergamasco

    This study proposed the synthesis of a new adsorbent material (GO#Fe2O3/ZnO), through the association of graphene oxide with nanoparticles of oxides of iron and zinc to increase dipyrone adsorption efficiency. The synthesised materials were characterised by TEM and SEM enabling identification of all the materials used in the synthesis in the composition of the new adsorbent. The pseudo-second-order model was the one that best represented the kinetics of dipyrone adsorption on GO#Fe2O3/ZnO, while the Langmuir model presented better adjustment for adsorption isotherms, with a maximum capacity of 116.442 mg g–1 at 318 K after 360 min of adsorption. The results indicated that the adsorption of dipyrone on GO#Fe2O3/ZnO was spontaneous above 298 K and endothermic according the thermodynamic parameters. The proposed adsorbent showed high efficiency, reaching 76% removal. Also, a interaction mechanism was proposed.

    更新日期:2018-12-10
  • Electropolymerization of Aniline and (N-Phenyl-O-phenylenediamine) for Glucose Biosensor Application
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-10
    Hamouda M. Mousa, John R. Aggas, Anthony Guiseppi-Elie

    Fabrication of conductive polyaniline nanofibers (PAnNFs) and poly(aniline-co-N-phenyl-o-phenylenediamine) nanoflakes [P(An-co-PoPD)] can promote a high surface area which influences rapid ion exchange and hence improved sensitivity in biosensor applications. Here, fabrication of two conductive films of PAnNFs from aniline monomer and a mixture of aniline /(N-phenyl-o-phenylenediamine (oPD) monomers through cyclic voltammetry (potentiodynamic electropolymerization) technique was performed. The electrochemical features of aniline monomer generate polyaniline nanofibers compared to aniline with addition of oPD monomer that generate nano-flakes. Electro-fabricated electrodes were characterized by SEM, Electrochemical Impedance Spectroscopy (EIS) and cyclic voltammetry (CV). A molecular recognition layer of glucose oxidase within chitosan (GOx:CHI) was applied to the electrode-supported polymer and produced chronoamperometry dose-responses to different glucose molar concentrations with sensitivities that were larger for P(An-co-PoPD) compared to PAnNFs electrode.

    更新日期:2018-12-10
  • Kelvin-Helmholtz instability forced by the intensive Faraday waves on the free surface of superfluid He-II
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-10
    Leonid Mezhov-Deglin, Alexander Pel'menev, Alexander Levchenko

    Experimental studies of the effect of variable acceleration achieved by vertical oscillations of a vessel with superfluid helium He-II on the formation of the Kelvin-Helmholtz instability on the surface of a liquid been carried out. It is observed that the development of the parametric instability and then Faraday waves on the surface leads to a significant decrease in a heat power and hence a critical velocity of the normal component under the He-II surface, above which the Kelvin-Helmholtz instability starts to develop.

    更新日期:2018-12-10
  • Improved photocatalytic performance of flower-like BiOBr/BiOCl heterojuctions prepared by an ionic liquid assisted one-step hydrothermal method
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-07
    Dongmei Ma, Huanhuan Liu, Jiao Huang, Junbo Zhong, Jianzhang Li, Dan Wang

    Construction of heterojuctions is a promising and solid strategy to tune the photocatalytic performance of BiOCl. In this work, flower-like BiOBr/BiOCl heterojuctions (IL-BiOCl) was in situ prepared by N-ethylpyridinium bromide ([BPy]Br) assisted one-step hydrothermal method. The samples were studied by a serials method. The results exhibit that [BPy]Br promotes the specific surface area and the separation rate of photoinduced carriers. Energy dispersive spectrometer (EDS) and high resolution transmission electron microscopy (HRTEM) results firmly reveal that BiOBr/BiOCl heterojuctions were successfully constructed. [BPy]Br provides Br source for BiOBr and influences the shape of the IL-BiOCl. Photocatalytic activity of the samples were evaluated, the results reveal that IL-BiOCl possesses higher photocatalytic activity than BiOCl toward decomposition of rhodamine B (RhB) under simulated sunlight irradiation.

    更新日期:2018-12-08
  • Fabrication of high performance low temperature solid oxide fuel cell based on La0.10Sr0.90Co0.20Zn0.80O5-δ cathode
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-07
    Ghazanfar Abbas, Muhammad Ashfaq Ahmad, Rizwan Raza, M. Hammad Aziz, M. Ajmal Khan, Fida Hussain, Tauqir A. Sherazi

    Nanostructure cathode material with composition of La0.10Sr0.90Co0.20Zn0.80O5-δ (LSCZO) was synthesized by wet chemical route. The crystallite size was found 47.55 nm and porosity was observed in the structure. The oxygen ion and electron transport phenomena were studied from anode to cathode and vice versa by electrical conductivity and electrochemical performance studies. The conductivity measurements were carried and found 20.29 and 4.87 S/cm2 in air and hydrogen atmosphere, respectively. The area specific resistance (ASR) was observed 0.07 Ω/cm2 at 550 oC. Arrhenius plots were drawn to calculate activation energy and found to be 0.09 eV. Excellent performance of 850 mW/cm2 has been recorded at 550 oC.

    更新日期:2018-12-08
  • Gradient hierarchical grain structures of Al0.1CoCrFeNi high-entropy alloys through dynamic torsion
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-07
    G. Chen, L.T. Li, J.W. Qiao, Z.M. Jiao, S.G. Ma, Fern Lan Ng, Z.G. Zhu, D. Zhao, Z.H. Wang

    Al0.1CoCrFeNi high-entropy alloys are firstly processed by cyclic dynamic torsion (DT) using Split-Hopkinson Torsional Bar. Gradient hierarchical microstructures produced by DT are investigated using electron backscattered diffraction, transmission electron microscopy, and nanoindentation tests. Based on the gradient torsional strain, significant grain refinement, remarkable work hardening, and hierarchical deformation substructures are introduced into the current DT-HEAs.

    更新日期:2018-12-08
  • Methyl modified SiO2 aerogel with tailored dual modal pore structure for adsorption of organic solvents
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-08
    Fengrui Zhang, Dong Su, Jian He, Zhiyuan Sang, Yue Liu, Yanxian Ma, Rui Liu, Xiao Yan

    Methyl modified silica (Me-SiO2) aerogels are prepared using tetraethylorthosilicate (TEOS) and methyltriethoxysilane (MTES) as co-precursor through a two-step sol-gel reaction followed by solvent exchange and supercritical drying. They possess tailored dual modal pore structure consisting of mesopores (10-18 nm) from the stacking of TEOS-derived clusters and small mesopores (2-6 nm) from filling and stacking of small MTES-derived clusters. Moreover, the replacing Si-OH groups by Si-CH3 groups on the aerogel’s surface makes them excellent hydrophobicity with contact angle up to 148°. The dual modal pore structure and hydrophobicity endow the Me-SiO2 aerogels outstanding adsorbing capability of quality factor Q up to 23 g/g for ethanol and selective adsorption of oil from water, which makes them tremendous potential for applications of oil adsorbing and oil-water separation.

    更新日期:2018-12-08
  • Superior strength and ductility of 1045 steel with heterogeneous composite structure
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-08
    Zhengning Li, Peiqing La, Jiqiang Ma, Xin Guo, Jie Sheng, Yu Shi, Xueyuan Zhou

    The effects of low temperature annealing on the microstructure and mechanical properties of cold rolled 1045 steel were investigated. It was found that the isothermal annealing at 673 K could transform cementite in the rolled steel from lamella to nano-crystalline state. Against the conventional theory, the low temperature annealing treatment could simultaneously enhance the tensile strength and ductility of the cold rolled steel. The underlying mechanisms of enhancing mechanical properties were analyzed, with a focus on the heterogeneous composite structure of a soft fine-grained matrix embedded with hard nano-scale cementite particles.

    更新日期:2018-12-08
  • New design and fabrication of Cu3SnS4@C nanostructure for high efficient removal of anionic dye
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-08
    Yan Li, Fangting Liu, Huixia Zhang, Xue Li, Xiaofei Dong, Gongxuan Lu, Chengwei Wang

    A new type of strong adsorbent nanostructure Cu3SnS4@C has been first designed and fabricated by two-step hydrothermal synthesis. For removal of anionic dye methyl orange (MO), in striking contrast to the weak adsorption of bare C nanospheres (0.7 mg/g), the Cu3SnS4@C nanostructures exhibit a very strong pH-sensitive adsorption performance with a maximum adsorbability of 65.99 mg/g at pH 5.0 and a minimum value of 8.11 mg/g at pH 11.0, in initial concentration of 70 mg/L MO. The samples’ adsorption mechanism could be well explained by pseudo-second-order kinetic model. Such significantly enhanced adsorbability of Cu3SnS4@C could be ascribed to the synergistic adsorption effect of Cu3SnS4 nanoparticles at C nanospheres, which can induce holes transfer and thus lead to massive positive active sites generation on Cu3SnS4@C available for synergistic adsorption anion dye.

    更新日期:2018-12-08
  • Study on the morphologies and electrochemical properties of the iron oxalate/graphene sheet composite with different polymorphs
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-08
    Keyu Zhang, Yin Li, Yunke Wang, Meimei Yuan, Yongnian Dai, Yaochun Yao

    Iron oxalate/graphene sheet (FeC2O4/Gs) composites with different crystal polymorphs were prepared through simple solvothermal reaction by controlling synthesis temperature. The effect of crystal structure on the morphology and the electrochemical performance was investigated. The results show that the structure and morphology are strikingly different in both phases. The β-FeC2O4·2H2O/Gs is composed with irregular shaped of nanometer sized rod and sheet particles. In contrast, the composite of α phase is the micron polygonal prism structure which is due to the reordering of hydrogen bonds between inter layer, resulting in excellent electrochemical performance: 916.49 mAh g-1 for the reversible specific capacity, a retention of 66.9% after 50 cycles and nearly 550 mAh g-1 after 200 cycles at 1 C. This work provides a new way for oxalate-based anode materials to modify initial irreversible capacity and improve capacity retention.

    更新日期:2018-12-08
  • Natural flexible superhydrophobic film derived from cajeput bark for oil/water separation
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-08
    Hui Yang, Shewen Ye, Yunfeng Wang, Jiaming Zhou, Jiahao Chen, Qinqin Zeng, Tongxiang Liang

    It’s still a big challenge to access a suitable natural derived film with superb flexibility and stable structure for oil/water separation. Herein, we described a facile method to prepare a natural flexible film derived from cajeput bark (CB). The film exhibits superhydrophobic and superoleophilic; the oil adsorption and oil/water separation results showed the film possesses a relative high adsorption capacity and extremely high flux (∼2700 L m-2 h -1) for oil/water separation. Hence, the film, with low-cost, environmental friendly character, accessibility and superb flexibility, might be a promising candidate for the cleanup of oil spill and oil/water separation.

    更新日期:2018-12-08
  • New-insight into the physical properties of Zn1-xBxO two-dimensional hexagonal nanodisks: An efficient material for dye sensitized solar cells
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-08
    Mohammad Ramzan Parra, Padmini Pandey, Hafsa Siddiqui, Syed B. Qadri, Fozia Z. Haque

    Two-dimensional Zn1-xBxO (x=0.0, 0.01, 0.03, 0.05) hexagonal nanodisks, were synthesized via simple solution method. The crystallographic analysis evidenced the successful incorporation of B3+ ion into ZnO lattice with pure wurtzite phase. With confirmed structure and morphology Zn1-xBxO samples were utilized as photoelectrode material in dye sensitized solar cell device and achieved respectable enhancement in efficiency. The device interface study was further conducted using electrochemical impedance spectroscopy, revealed better charge transport process and charge storage capability.

    更新日期:2018-12-08
  • Synthesis and characterization of MnWO4/TmVO4 ternary nano-hybrids by an ultrasonic method for enhanced photocatalytic activity in the degradation of organic dyes
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-06
    Ali Sobhani-Nasab, Saeid Pourmasoud, Farhad Ahmadi, Marcin Wysokowski, Teofil Jesionowski, Hermann Ehrlich, Mehdi Rahimi-Nasrabadi

    In this study, novel MnWO4/TmVO4 ternary nano-hybrids were synthesized effectively via a simple sonochemical method. The products were characterized in detail with the use of modern analytical techniques including XRD, EDX, TEM, DRS, BET, PL, and VSM. To the authors’ best knowledge, this is the first report on the synthesis and photocatalytic performance of MnWO4/TmVO4 ternary nano-hybrids in the degradation of rhodamine B (Rh B), 2-naphthol (Na), phenol red (Ph R), and eosin Y (EY) under visible light. Based on the degradation results, MnWO4/TmVO4 is shown to have higher photodegradation ability than pure TmVO4 or MnWO4 nanoparticles. It was also found that maximum degradation (99.2%) is achieved in the case of Rh B dye.

    更新日期:2018-12-07
  • A lanthanide-based coordination polymer as lithium ion battery anode with high cyclic stability
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-06
    Shu-Biao Xia, Fu-Shao Li, Xiang Shen, Xue Li, Fei-Xiang Cheng, Cheng-Ke Sun, Hong Guo, Jian-Jun Liu

    A lanthanide-based coordination polymer Tb2(H2dobdc)3(DMF)4 (Tb-MOF), was prepared by the solvothermal reaction. Benefitting from the large amount and uniform distribution of oxygen atom, conjugated aromatic nucleus as active electrochemical reaction sites, Tb-MOF anode exhibits good specific capacity and excellent cycle performance. The initial discharge specific capacity reached 627.5 mAh g-1 and a 87.4% capacity retention after 100 cycles at a current density of 100 mA g-1. At the same time, Tb-MOF electrode has an extremely high structural stability, and the capacity retention is maintained at 99.1 % even if it is cycled 3000 times at a current density of 0.8 Ag-1. The research results show that this novel rare earth complex electrode has important research value and application potential compared with traditional anode materials.

    更新日期:2018-12-07
  • Influence of 4,4'-bipyridine doped polyvinylidine fluoride/potassium iodide/iodine solid polymer electrolytes for dye-sensitized solar cell applications
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-06
    S. Kannadhasan, Muthu Senthil Pandian, P. Ramasamy

    Different weight percentages (0%, 10%, 20%, 30%, 40% and 50%) of 4,4'-bipyridine doped polyvinylidene fluoride/potassium iodide/iodine (PVDF/KI/I2) solid polymer electrolytes (SPEs) were prepared by solution casting technique using N,N-dimethylformamide (DMF) as solvent. The crystallinity, ionic conductivity, surface morphology and photovoltaic performance of 4,4′-bipyridine doped PVDF/KI/I2 SPEs were examined. The lowest crystallinity of 30% 4,4′-bipyridine doped PVDF/KI/I2 SPE was confirmed. The surface morphology of 30% 4,4′-bipyridine doped PVDF/KI/I2 SPE has the smallest spherical particles with voids. The 30% 4,4′-bipyridine doped PVDF/KI/I2 SPE exhibited the highest ionic conductivity value of 7.77×10-5 Scm-1. This is due to the lowest crystallinity and highest ionic mobility of the electrolyte. The dye-sensitized solar cells (DSSCs) were fabricated using 4,4′-bipyridine doped PVDF/KI/I2 SPEs, among them 30% 4,4′-bipyridine doped PVDF/KI/I2 SPE used DSSC exhibited the highest power conversion efficiency (PCE) of 3.6 % under an illumination of 100 mW/cm2.

    更新日期:2018-12-07
  • Room temperature ferromagnetic behavior of manganese/manganese oxides nanocomposites
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-07
    A. K.M. Atique Ullah, A. Hossain, M. Akter, M.F. Kabir, M. N.I. Khan, A. K.M. Fazle Kibria, Shakhawat H. Firoz

    Three different manganese oxide nanocomposites such as Mn3O4, Mn5O8, and Mn2O3 along with metallic-Mn were synthesized via a single route depending on calcination temperature. Structural, electrical, and magnetic properties were assessed for the synthesized nanocomposites. The real and imaginary parts of dielectric constants decreased at the lower frequency and then remained constant at the higher frequency for all the three types of nanocomposites. The permeability of the nanocomposites also followed the same order. Mn/Mn5O8 nanorods showed strong ferromagnetic behavior at room temperature although Mn-nanoparticles and Mn5O8 are paramagnetic and antiferromagnetic in nature respectively.

    更新日期:2018-12-07
  • High performance nano-α-Fe2O3 electrode materials synthesized by facile and green approaches for Lithium-ion batteries
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-07
    Na Wu, Ya Ru Shi, Can Ma, Xue Zhang, Jin-Ming Zhou, Yu Wei, Hui Liu, Yang Yan, Hua-Ting Liu

    α-Fe2O3 nano-powders with different morphologies are synthesized by two facile, economical and environment-friendly methods. When evaluated as anode material for Li ion battery, the acicular nano-α-Fe2O3 electrode delivers a high reversible capacity of 937 mA h g-1 with the Coulombic efficiency more than 93%.

    更新日期:2018-12-07
  • Effect of rolling reduction on antiphase domains, grain boundary character distribution and plastic deformation of Fe-6.5 wt%Si alloy
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-06
    Guojun Cai, Changsheng Li, Ban Cai, Qiwen Wang

    The variation in plastic deformation of Fe–6.5 wt%Si alloy depends on antiphase domains and grain boundary character distribution. With the increase of rolling reductions from 50% to 85%, the increment of dislocation density causes decline of the sizes of antiphase domains, meanwhile the sharp and homogeneous distribution of γ-fiber texture is prone to obtaining a large fraction of CSL boundaries, thus the fracture deflection of 65% warm-rolled sheet is increased to 8.6 mm by 38.7% in comparison to that of 50% warm-rolled sheet (6.2 mm), and that of 85% warm-rolled sheet has nearly three times increment (18.2 mm).

    更新日期:2018-12-06
  • Synthesis and application of graphene oxide aerogel as an adsorbent for removal of dyes from water
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-06
    Tran Hoang Tu, Phan Thi Ngoc Cam, Le Van Trong Huy, Mai Thanh Phong, Hoang Minh Nam, Nguyen Huu Hieu

    In this work, graphene oxide aerogel (GOA) was synthesized by ice segregation induced self-assembly method. The characterization of GOA was studied by Fourier transform infrared spectroscopy, X–ray diffraction, Raman spectroscopy, transmission electron microscopy, scanning electron microscope, and Brunauer–Emmett–Teller specific surface area. Effects of contact time, pH, and initial concentration on the adsorption capacity of GOA were studied. The adsorption process fitted well with pseudo-second-order kinetic and Langmuir isotherm models with the maximum adsorption capacities for methylene blue and methyl orange of 480.76 and 55.56 mg/g, respectively.

    更新日期:2018-12-06
  • On the strengthening precipitate structures in Mg-Gd-Ag alloy: An atomic-resolution investigation using Cs-corrected STEM
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-06
    Jingxu Kent Zheng, Chenyang Zhu, Zhi Li, Ruichun Luo, Xiaoqin Zeng, Bin Chen

    Based on Cs-corrected scanning transmission electron microscopy (STEM), the present paper reports on the precipitation evolution in Mg-Gd-Ag alloy aged at 200°C. Basal γ’’ precipitates serve as the key strengthening structures in the under-aged sample. The formation of γ’’ involves the displacement of a (0001) layer along [11 2 - 0]Mg, as proved by HAADF observations from both [11 2 - 0]Mg and [10 1 - 0]Mg. Under the peak-age condition, the alloy is strengthened by basal γ’’ and prismatic β ' . At the over-age stage, coarse particles, which are enriched with Ag and Gd, and highly stacked γ’’ form within the alloy. No γ’ is observed through the ageing of this Mg-Gd-Ag alloy.

    更新日期:2018-12-06
  • Enhancing the visible-light photoresponse of SnO and SnO2 through the heterostructure formation using one-step hydrothermal route
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-06
    Adri Huda, Reisya Ichwani, Chanel Tri Handoko, Bambang Yudono, Muhammad Djoni Bustan, Fakhili Gulo

    The effort to enhance the visible-light photoresponse of SnO2 and SnO has been designed by the heterostructure formation of tin oxide. The formation was conducted by controlling the oxidation state of precursor through adjusting the precursor acidity. The result shows that the transformation route as a function of precursor initial pH involve the formation of intermediate phase began by SnO2 to SnO2/Sn3O4 to SnO/Sn3O4, and finally SnO. The characterization indicated that Sn3O4 played the important role in enhancing the visible light response of both SnO2 and SnO in the heterostructure formation.

    更新日期:2018-12-06
  • Fabrication and Photocatalytic Activity of Core@Shell Ag3PO4@Cu2O Heterojunction
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-06
    Guiqin Hou, Xiongfeng Zeng, Shuijing Gao

    Novel Ag3PO4@Cu2O core@shell heterojunction photocatalysts were fabricated through liquid phase reduction and chemical deposition method. Flower-like structures Cu2O were loaded on the surface of Ag3PO4 nanorods. The prepared Ag3PO4@Cu2O exhibited highly efficient photocatalytic activity for photodegradation of MB under visible-light irradiation. The possible mechanism for the excellent performance of this structure was also established.

    更新日期:2018-12-06
  • Synthesis of core–shell structured tetra-needle ZnO whisker and Fe composite with excellent electromagnetic properties
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-06
    Chaoqun Ge, Liuying Wang, Gu Liu, Tao Wang, Haiqing Chen

    Core−shell structured T-ZnOw@Fe composite composed of a dielectric T-ZnOw core and a ferromagnetic Fe shell was synthesized using MOCVD method. Rough α-Fe shell was homogeneously deposited on the surface of T-ZnOw. The as-prepared composite exhibits excellent microwave absorption properties with the minimum reflection loss (RL) of –55.6 dB for a thickness of 1.48 mm and the broadest effective absorption bandwidth (less than –10 dB) of 4.56 GHz for a thickness of 1.55−1.66 mm. The enhanced electromagnetic performances are attributed to the enhanced interfacial polarization, natural resonance, and exchange resonance. The results imply that the deposition of α-Fe shell on T-ZnOw was an efficient way to fabricate lightweight and high-performance microwave absorption materials.

    更新日期:2018-12-06
  • 3D structures of Graphene oxide and Graphene analogue MoS2 with polypyrrole for supercapacitor electrodes
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-06
    T. Prasankumar, J. Vigneshwaran, Sibi Abraham, Sujin P. Jose

    Transition metal dichalcogenides (TMDs) like Molybdenum disulfide (MoS2) are confessed as an effective energy storage materials due to their 2D structure analogues to graphene. Robust 3D architectures of graphene oxide-polypyrrole (GO-PPy) and molybdenum disulfide-polypyrrole (MoS2-PPy) were fabricated by facile, one pot chronoamperometry method to achieve scalable, conductive additive free and binder free supercapacitor electrodes. The electrodeposited GO-PPy and MoS2-PPy electrodes exhibit the specific capacitance of 271 F g−1 and 130 F g−1 respectively at a current density of 1 A g−1. The introduction of reduced graphene oxide (rGO) in PPy matrix offered high capacitance, whereas graphene analogue MoS2 improved the structural stability. Pronounced cycling stability (>2000 cycles) and note-worthy capacitive retentions were also displayed by these composites. MoS2-PPy and GO-PPy retain 82 and 64% of its initial capacitance respectively. These findings are backed up by the correlation of structure and electrochemical performance of GO-PPy and MoS2-PPy.

    更新日期:2018-12-06
  • In-situ Preparation of Copper Azide by Direct Ink Writing
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-06
    Lei Zhang, Fang Zhang, Yanlan Wang, Ruishan Han, Jianhua Chen, Rui Zhang, Enyi Chu

    The aim of the present work is to design a copper azide precursor direct writing ink for primary explosive-on-a-chip. The mixture of water/vinyl alcohol and isopropanol/ethyl cellulose was used as binder. Cetyltrsimethylammonrum bromide (CTAB) used as foaming agent and dodecanol as foam stabilizer were added into the binder to produce plenty of bubbles. 40 wt.% of nano-copper powder was added into the binder and the three-dimensional porous precursor ink was obtained. After 24 hours of in-situ gas-solid azide reaction, the copper precursor ink was completely transformed into copper azide. An explosive device was designed to verify the detonation performance of the copper azide by direct writing, and the result showed that it can reliably initiate the CL-20 into complete detonation.

    更新日期:2018-12-06
  • Nanoindentation and microstructure analysis of Ti/Fe dissimilar joint
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-06
    Qiaoling Chu, Jie Li, XiongWei Tong, Shuai Xu, Min Zhang, Cheng Yan

    Ti/Fe bimetallic plate was joined by Cu20V filler. Ti/Fe interface was characterized by fine dendrite structures (β-Ti+FeTi) with hardness ranging from 11-16GPa. These fine dendrites were transformed into coarse cellular structures (CuTi2) when approaching Cu20V weld metal (WM). Cu4Ti and V(s,s) phases were dominant in the central of Cu20V WM with hardness ranging from 4-11GPa. Complex phase constitutions were observed at Cu20V/Fe WM interface consisted of Cu4Ti, V(s,s), Cu(s,s), σ-FeV and Fe2Ti phases with hardness ranging from 4-18GPa. A simplified scenario describing how these phases evolution at Cu20V/Fe WM interface was proposed.

    更新日期:2018-12-06
  • Ultra-high specific capacity of Cr3+-doped Li4Ti5O12 at 1.55 V as anode material for lithium-ion batteries
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-05
    Delai Qian, Yijie Gu, Yunbo Chen, Hongquan Liu, Juan Wang, Henghui Zhou

    Cr3+-doped Li4Ti5O12 (LTO) was fabricated by spray drying followed by a solid-state reaction. The crystal structure and morphology of the sample was tested using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The experimental results show that Cr3+-doped LTO not only significantly improved the discharge specific capacity but also maintained the original 1.55-V discharge platform. During the process of discharge–charge, Cr3+-doped LTO showed a long discharge plateau (91.4% of the entire discharge process) at 1.55 V and an ultra-high initial discharge specific capacity of 240.6 mAhg-1 at 0.1 C. Furthermore, it can maintain 144.7 mAhg-1 at 5.0 C after 200 cycles, which is 92% of its initial discharge capacity.

    更新日期:2018-12-05
  • FeCoNi ternary alloy embedded mesoporous carbon nanofiber: an efficient oxygen evolution catalyst for rechargeable zinc-air battery
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-05
    Congling Li, Zhijie Zhang, Mengchen Wu, Rui Liu

    FeCoNi alloy embedded mesoporous carbon nanofiber (FeCoNi-CNF) has been prepared via electrospinning and subsequent carbonization. Benefiting from the unique FeCoNi alloy composition and porous 1D carbon structure, FeCoNi-CNF presented an overpotential of 220 mV at 10 mA cm-2 and a Tafel slope of 57 mV dec-1 as an OER catalyst. It also exhibited a low discharge-charge voltage gap (0.88 V, at 20 mA cm-2), higher power density (73 mW cm-2, at 80 mA cm-2) and long-term stability when testing for Zn-air battery.

    更新日期:2018-12-05
  • Sulphated Zr-Al2O3 catalysts through jatropha oil to green-diesel production
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-05
    A. Ramesh, K. Palanichamy, P. Tamizhdurai, S. Umasankar, K. Sureshkumar, K. Shanthi

    Composite materials of zirconia-alumina (Zr-Al2O3) with Al/Zr 10 ratio was successfully synthesized by sol-gel method and followed by different sulfiding methods. The synthesized catalysts were characterized by various techniques such as X-ray powder diffraction (XRD), N2-sorption, NH3-Temperature Programmed Desorption (NH3-TPD), Diffuse Reflectance UV-Vis Spectrophotometers (DR UV-Vis), Scanning Electron Microscopy (SEM), and the biodiesel was analyzed by Gel permeation chromatography (GPC) and Gas chromatography–mass spectrometry (GC-MS). The jatropha oil conversion of above 96% was obtained at optimized conditions of 110°C, 1:20 jatropha oil to methanol ratio, 1.5 g of catalysts and 3h reaction time. The catalysts reusability study was performed for 6th cycles using sulphated Zr-Al2O3 under hydrothermal (H) method, denoted as SO42-/Zr-Al2O3 (10)-H and the activity is correlated with physico-chemical properties.

    更新日期:2018-12-05
  • Controlling the Zinc Oxide Unipolarity through Dual Acceptor Doping for Spray-cast Homojunction Diode
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-05
    Sebin Devasia, P.V. Athma, E.I. Anila

    Dual acceptors, Phosphorous and Nitrogen, were simultaneously doped into zinc oxide crystallite structure for achieving stable p-type conductivity through simple spray pyrolysis technique. Doping concentration was varied from 0 to 1.25 at.% in steps of 0.25. The structural, morphological, optical and electronic properties were investigated for phosphorous and nitrogen doped ZnO (NPZO) samples. Furthermore, the optimized p-type film was used for fabricating homojunction with aluminium doped n-type layer (AZO) which was also deposited using spray pyrolysis. The IV characteristics shows the diode behavior of the created homojunction from which the ideality factor was calculated to be 3.16.

    更新日期:2018-12-05
  • A Facile Strategy for Preparation and Application of Squaraine Nanometer Hybrids with Broad Band Absorption
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-05
    Nahla Omer, Fayin Zhang, Kaibing Xu, Gang Zhao, Shanyi Guang, Elwathig AM Hassan, Hongyao Xu

    Organic materials are receiving more attention in the solar cell due to their better solution process, controllable synthesis, tunable chemical and physical properties. However, the focus problem of compatibility and aggregation is to be solved urgently in organic materials, which inevitably limits them widely application. To this end, an inorganic-organic hybrid materials with wide-band absorption is designed and prepared, that incorporates octavinyl-polyhedral oligomeric silsesquioxane with 6-bromoquanaldine to produce H1, then reacts with squaric acid to design H2, which efficiently avoids the fluorescence quenching due to the steric hindrance. The electrochemical results shows that the energy level of H2 is match well with the commercial dye N719. Hence it shows a better photovoltaic performance based on dye-sensitized solar cell, along with power conversion efficiency up to 7.73 % when it is co-sensitized with N719. The hybrid system exhibits good performances in solar cell and long-term stability.

    更新日期:2018-12-05
  • PEG modified trimethyl chitosan based nanoparticles for the codelivery of doxorubicin and iSur-pDNA
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-05
    Qi Mai, Suqin Shen, Yifu Liu, Cui Tang, Chunhua Yin

    Doxorubicin (DOX) is one of the commonly used chemotherapeutic agents, but its clinical use is restricted by systemic toxicity and tumor multidrug resistance. To overcome these barriers, PEG modified trimethyl chitosan based nanoparticles (NPs) were prepared for the coencapsulation and codelivery of DOX and survivin shRNA-expressing plasmid (iSur-pDNA). These NPs with particle sizes of 181.9 nm and zeta potentials of 20.2 mV exhibited a pH-sensitive release of DOX and a sustained release of iSur-pDNA, which exerted significantly enhanced in vivo antitumor efficacies compared with single administration with DOX or iSur-pDNA. The results indicated that combinational administration of chemotherapeutic drugs and genes based on NPs could be promising in cancer therapy.

    更新日期:2018-12-05
  • Structural and Ferroelectric Properties of P(VDF-TrFE) Thin Films Depending on The Annealing Temperature
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-04
    Jeongdae Seo, Jong Yeog Son, Woo-Hee Kim

    Organic P(VDF-TrFE) 70/30 copolymer thin films were prepared on ITO/glass substrates at 110–150 °C by spin coating. All the P(VDF-TrFE) thin films exhibited ferroelectric β-phase crystallinity in X-ray diffraction analysis. The polarization-electric field hysteresis analysis revealed that the P(VDF-TrFE) thin film annealed at 140 °C has superior ferroelectric properties with a high remanent polarization of 8.02 μC/cm2. From atomic force microscopic characterization, we observed lamellar and needle-like structures in the P(VDF-TrFE) thin film annealed at 140 °C. Further, piezoelectric force microscopic measurements confirmed a much higher piezoelectric property of the P(VDF-TrFE) thin film annealed at 140 °C than those of the films annealed at other temperatures.

    更新日期:2018-12-04
  • Photocurrent enhancement on TiO2 nanotubes co-modified by N+ implantation and combustion of graphene
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-03
    Jing Han, Xinggang Hou, Huanli Liu, Jing Li, Jianghong Yao, Dejun Li, Ping Wu

    Nitrogen ions doped TiO2 nanotubes (N-TNTs) were synthesized via ion implantation and anodization. Graphene was deposited on the surface of N-TNTs during anodization. After being annealed at the temperature of 450 °C, the samples were determined using FE-SEM, XRD, XPS, and UV-Vis DRS. The photoelectric performance of the samples was confirmed by transient photocurrent. The results indicated that morphology and structure of N-TNTs were improved due to ion implantation. Because of the combustion of deposited graphene during the annealing process, the degree of crystallinity of N-TNTs was improved, and the contents of substitutional N increased. The TNTs modified by ion implantation and combustion of graphene exhibited the best photoelectric performance.

    更新日期:2018-12-03
  • Template-free Electro-synthesis of PbO2 Nanorod with Chrysanthemum-like Array
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-03
    X.M. Li, S.S. Li, X. Ma, K. Tang, Z. Wang, X. Hao, A. Abudula, G. Guan

    PbO2 electrode is one of crucial materials in electrochemical field, however, the fabrications of nanostructured PbO2 materials are highly confined to the template method. In this work, the nanostructured PbO2 materials were controllably synthesized by template-free electrodeposition method. It is found that the microstructure of PbO2 material was highly depended on the electrochemical deposition models, i.e., cyclic voltammetry (CV) method, potentiostatic method (PM), pulse potentiostatic method (PPM) and pulse galvanostatic method (PGM). Especially, PbO2 nanorod built by nanoparticles with chrysanthemum-like array synthesized in the absence of template by pulse potential deposition method showed high specific capacitance and good stability for supercapacitor application.

    更新日期:2018-12-03
  • Au as a cocatalyst loaded on solid solution Bi0.5Y0.5VO4 for enhancing photocatalytic CO2 reduction activity
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-03
    Wei Chen, Yanhong Wang, Wenfeng Shangguan

    Au as a cocatalyst was deposited on the surface of solid solution Bi0.5Y0.5VO4 by a photodeposition method for photocatalytic reduction of CO2. Au particles loaded on the surface of Bi0.5Y0.5VO4 apparently enhanced the photocatalytic activity of CO2 reduction toward CO evolution. The highest rate of CO evolution was obtained over 1.0 wt% Au/ Bi0.5Y0.5VO4, reaching 3.5 times of that of bare Bi0.5Y0.5VO4. The improved photocatalytic performance was assigned to the lower overpotential of Au/Bi0.5Y0.5VO4 for CO evolution than that of bare Bi0.5Y0.5VO4 as well as the formation of Schottky barrier, which promotes the separation of photogenerated electron-hole pairs.

    更新日期:2018-12-03
  • Ni3S2/Ni@S/C composite: facile synthesis and high performance as the anode for Na-ion batteries
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-03
    Zhongde Wang, Weitao Song, Wenjun Yan, Wei Zhang, Ye Liu, Xiaogang Hao, Guoqing Guan

    In this work, an ultrathin sulfur-doped Graphene-like carbon (S/C) layer wrapped Ni3S2/Ni composite (Ni3S2/Ni@S/C) is simply fabricated by in situ growth of an ultrathin sulfur-doped Graphene-like carbon layer on the Ni3S2/Ni surface, and used as an anode material for SIBs, which shows a high specific capacity (318.2 mA h g-1 at 100 mA g-1 after the 120 cycles) and excellent cyclic stability (212.7 mA h g−1 at 1000 mA g-1 after 250 cycles with a corresponding cycles capacity retention of 97.6%).

    更新日期:2018-12-03
  • Study on the Technology and Properties of 3D Bioprinting SF/GT/n-HA Composite Scaffolds
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-03
    Xiaofang Wu, Kai Chen, Dekun Zhang, Linmin Xu, Xuehui Yang

    In this paper, three kinds of natural polymer materials, silk fibroin (SF), gelatin (GT), and nano-hydroxyapatite (n-HA), are mixed as 3D printing bioink to mimic protein polysaccharide and collagen fibers in natural articular cartilage. By changing the SF content, SF/GT/n-HA composite scaffolds with different ratios are prepared using 3D bioprinting technology. The microstructure and morphology, biological properties and mechanical properties of composite scaffolds are characterized. The results show that the printing precision of the bioink with 10%SF is best, and the composite scaffold with 10%SF also exhibits better mechanical properties, whose tensile elastic modulus is 10.60±0.32MPa and the compression elastic modulus is 1.22±0.06MPa. These studies are helpful to understand the interaction between SF, GT and n-HA, and provide a theoretical basis for the preparation of better silk fibroin-based composite scaffolds.

    更新日期:2018-12-03
  • Nano silicon embedded porous NiFe2O4 floral microspheres with the improved performance of lithium storage
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-02
    Qian Liang, Weishan Zhou, Xianhua Hou, Chengyang Wei, Haiqing Qin, Fuming Chen

    The porous NiFe2O4/Si microspheres (NFO/Si) are prepared by nano silicon embedment into NFO using liquid nitrogen quenching and freeze-drying methods. Compared with pure nano silicon or NFO as lithium-ion battery anode, the porous NFO/Si microspheres deliver a promising specific capacity up to 906 mAh g-1 after 100 cycles at the current density of 0.1 A g-1. The composite electrode materials also demonstrate excellent rate performance at high current density. The improved electrochemical properties are due to the synergistic effect of high capacity silicon embedment in porous NFO/Si microspheres, which improves the Li+ intercalation-deintercalation process. The porous NFO/Si microspheres exhibits the excellent lithium-ion storage as anode materials.

    更新日期:2018-12-02
  • Synthesis and Characterization of Novel Polyethylene Oxide –Dinuclear Cu(II) Complex Electrospun Nanofibers
    Mater. Lett. (IF 2.687) Pub Date : 2018-12-01
    Jamie A.G. Hamilton, Andrew Ozarowski, Edikan Archibong, Sylvia Thomas, William Serrano-Garcia, Sebastian A. Stoian, Christopher Weider, Nelly Mateeva

    Nanoscale metal composite materials with tunable properties have attracted interest in many areas, such as catalysis, electronics, and photography. Typical matrices include zeolites, metal oxides, or polymer films. This study reports for first time the incorporation of a dinuclear copper (II) complex in polyethylene oxide (PEO) fiber mat by electrospinning. EPR studies have shown that the complex remained intact and stable within the polymer fibers. The fiber morphology was characterized by SEM. The absorption of the complex allowed to monitor the composition and distribution of the metal on the material.

    更新日期:2018-12-01
  • CO2 absorption properties of lithium sodium orthosilicate in the presence of water vapor at room temperature
    Mater. Lett. (IF 2.687) Pub Date : 2018-11-30
    Ikuo Yanase, Kento Sato, Hidehiko Kobayashi, Takahiro Doe, Takayuki Naka

    We discovered that water vapor enhanced the CO2 absorption capacity of sodium orthosilicate (Li3NaSiO4) at as low as room temperature (RT) and the CO2 absorption property of Li3NaSiO4 in the presence of water vapor was larger than that of Li3NaSiO4 under a dry CO2 flow at high temperatures. Li3NaSiO4 powders were synthesized by heating a mixture of LiNO3, NaNO3, and amorphous SiO2 at 800 °C for 5 h in air. Thermogravimetry analysis shows that CO2 absorption of Li3NaSiO4, at RT, increased as a function of relative humidity and CO2 concentration. CO2 absorption of Li3NaSiO4 in the presence of water vapor resulted in the formation of NaHCO3 and Li2SiO3, as observed by X-ray diffraction (XRD), whereas >300 °C, Li3NaSiO4 reacted with CO2 to produce LiNaCO3 and Li2SiO3 under a dry CO2 flow. The CO2 absorption capacity of Li3NaSiO4, at RT, was enhanced in the presence of water vapor compared with Li3NaSiO4 under a dry CO2 flow at high temperatures. XRD determined that Li3NaSiO4 was regenerated by the heat treatment of the CO2-absorbed Li3NaSiO4 at 600 °C.

    更新日期:2018-11-30
  • Microstructure and shape memory effect of laser welded Nitinol wires
    Mater. Lett. (IF 2.687) Pub Date : 2018-11-30
    Runhua Yao, Peng Dong, Peter K. Liaw, Jun Zhou, Wenxian Wang

    In this study, crossed Nitinol wires were joined by laser welding, and the microstructures of the joint in various zones were revealed by transmission electron microscopy. A series of nanoindentation experiments were performed across the joint, and the size changes of indentations after heating were used to evaluate the shape memory effects. Compared to BM, HAZ retained about the 95% shape recovery, higher than FZ, which retained about the 75% recovery rate.

    更新日期:2018-11-30
  • Flame sprayed environmentally friendly high density polyethylene (HDPE)-capsaicin composite coatings for marine antifouling applications
    Mater. Lett. (IF 2.687) Pub Date : 2018-11-30
    Yi Liu, Xiaoqi Shao, Jing Huang, Hua Li

    Marine biofouling has emerged as worldwide serious problems for artificial marine infrastructures. Among the measures taken so far to solve the abovementioned problems, construction of an antifouling layer has been proven to be effective in offering long-term antifouling performances. Antifouling based on the use of biocides is the most important method in modern maritime industries. While tributyltin (TBT)-based self-polishing coatings are being replaced by other biocide-releasing coatings, the environmental toxicity of these compounds is also under scrutiny. Therefore, there is a significant interest in developing non-toxic technologies. Green biocides can also be extracted from many types of organisms including terrestrial plants, sea creatures and bacteria. The capsaicin was extracted from chili pepper. In this study, flame sprayed high density polyethylene (HDPE)-capsaicin composite coatings were developed for marine antifouling applications. Capsaicin powder were fixed by polymer-based substrate and distributed evenly. Antifouling performances of the films were assessed by examining survival and colonization behaviors of E. coli and Bacillus sp. bacteria and Phaeodactylum tricornutum. Antifouling test indicated excellent antibacterial properties of HDPE-capsaicin composite coatings against both gram-negative Escherichia coli and gram-positive marine Bacillus sp. bacteria. Excellent antifouling performances against bacteria and algae of the thermal sprayed composite coatings give clear insight into their potential applications as environmentally friendly antifouling layers in the marine environment.

    更新日期:2018-11-30
  • New type of macrozone in a near-β titanium alloy Ti-5Al-5Mo-5V-1Cr-1Fe
    Mater. Lett. (IF 2.687) Pub Date : 2018-11-30
    Zhan Hu, Danqing Yi, Huiqun Liu, Xiyi Zhou, Hangwei Zhou

    α macrozones are usually observed in near-α/α+β titanium alloys but have not been reported in near-β titanium alloys. This article shows that a new type of α macrozone has been observed using electron backscatter diffraction (EBSD)-orientation maps in a near-β titanium alloy Ti-5Al-5Mo-5V-1Cr-1Fe after thermo-mechanical processing. The microstructure in the macrozone was comprised of primary α plates (αp) and secondary α platelets (αs) with insignificant differences in shape. The majority of α platelets had similar orientation after aging.

    更新日期:2018-11-30
  • Geometrically Necessary Dislocations (GNDs) in iron processed by Equal Channel Angular Pressing (ECAP)
    Mater. Lett. (IF 2.687) Pub Date : 2018-11-30
    Jairo Alberto Muñoz

    The calculation of Geometrically Necessary Dislocations (GNDs) in iron processed by ECAP has been carried out via Electron Back Scatter-Diffraction (EBSD) and Transmission Electron Microscopy (TEM). Transmission microscopy reveled higher and more accurate dislocation densities than Electron Back Scatter-Diffraction at different deformation levels.

    更新日期:2018-11-30
  • Preparation of amorphous nano-selenium-PEG composite network with selective antimicrobial activity
    Mater. Lett. (IF 2.687) Pub Date : 2018-11-30
    Vilém Bartůněk, Barbora Vokatá, Kateřina Kolářová, Pavel Ulbrich

    In this work selenium-polyethylene glycol 6000 (PEG6000) composite network was synthesized. Simple and inexpensive one-pot method was performed at room temperature. Saturated water solution of diethyl ether acted as a solvent and ascorbic acid was used as a reduction agent for sodium selenite. Prepared orange selenium-PEG6000 solid composite was characterised by SEM, XRD and TEM measurements. The antibacterial activity of prepared sample was tested on Gram-positive Staphylococcus epidermidis (DBM 2124) and Gram-negative Escherichia coli (DBM 3138). Synthesized material showed antibacterial activity on S. epidermidis, however, E. coli bacteria were not inhibited. Although bulk-like, the material has a large surface area and anti-microbial properties of nano-sized amorphous selenium. Thus it can be used in specific applications, e.g. as a special targeted drug or for selective antimicrobial coating.

    更新日期:2018-11-30
  • One-step hydrothermal synthesis of carbon dots-polymer composites with solid-state photoluminescence
    Mater. Lett. (IF 2.687) Pub Date : 2018-11-30
    Xuegang Zheng, Guqiao Ding, Hailong Wang, Guangliang Cui, Pinhua Zhang

    Carbon dots (CDs) and CDs-polymer composites were one-step synthesized in a hydrothermal process using hexamethylenetetramine and polycarbonate as precursors. Their optical properties and the application as solid-state phosphors towards white light-emitting diodes (LEDs) were thoroughly investigated. CDs solutions exhibit strong yellow emission under blue illumination and possess excitation-independent luminescent behavior. Owing to precursor polymerization, CDs-polymer composites were synthesized in one step. The dried CDs-polymer composite powders exhibit excellent optical stability and no luminescence quenching was observed. Under light blue illumination, the powders show broad yellow luminescence with the peak wavelength centered at 550 nm and PL quantum yield of 14.86%. For their practical applications, stable white light emission was demonstrated by coating a 455nm blue LED with the powders. Our research offers a valuable reference for growing CDs-polymer composites in a facile, low-cost and low-temperature hydrothermal process and developing white LEDs with light blue LEDs and metal-free phosphors.

    更新日期:2018-11-30
  • Spongy Structured α-Ni(OH)2: Facile And Rapid Synthesis for Supercapattery Applications
    Mater. Lett. (IF 2.687) Pub Date : 2018-11-30
    J. Johnson William, I. Manohara Babu, G. Muralidharan

    Spongy-like α-Ni(OH)2 was rapidly prepared through microwave irradiation method. The spongy structure was identified to be of interspersed nanorods (2.5 nm thickness). Moreover, its mesoporus nature has made the α-Ni(OH)2 as an efficient electrode by revealing a specific capacity of 439 C g-1 at a specific current of 2 A g-1. Further, the α-Ni(OH)2//AC supercapattery cell has been fabricated using polyurethane foam as separator. A specific capacitance of 246 F g-1 (2 A g-1) was estimated with the specific energy of 49 W h kg-1 and specific power of 696 W kg-1. The studied supercapattery cell could retain 87% of capacity even after 2000 continuous charge-discharge cycles.

    更新日期:2018-11-30
  • Surface modification of nano Pd and its application in selective dechlorination reaction
    Mater. Lett. (IF 2.687) Pub Date : 2018-11-30
    Lihui Zeng, Zhaotie Liu, Canbin Ouyang, Jialei Liu

    Novel Pd catalysts were prepared with different metal promoters by wet impregnation method. And the catalytic performance of dichloroacetic acid (DCA) hydrogenation was studied in fixed-bed reactor. XRD and TEM were used to characterize the structure of catalysts. The results show that the additives of Ce, Fe and Ca can improve the uniformity of Pd particles, and change the particle size of Pd. The catalytic results show that additive of Ca exhibited the best catalytic performance of DCA hydrogenation, the residual DCA is only 0.01% and excessive dechlorination is effectively avoided.

    更新日期:2018-11-30
  • Synthesis and characterization of nano-layered Mg-vermiculite by hydrothermal method
    Mater. Lett. (IF 2.687) Pub Date : 2018-11-30
    Zhilong Fu, Ting Liu, Xirui Kong, Yi Liu, Jie Xu, Bo Zhang, Huimin Chen, Zhaoyang Chen

    The Mg-vermiculite (MVerm) with the nano-layered structure was synthesized by a facile hydrothermal method at 300 °C. The concentration of NaOH solution was found to be the most important factor for the formation of layered MVerm, and the optimal concentration was 2.05 mol/L. The structure, morphology and chemical composition of MVerm with layered structure were demonstrated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray fluorescence (XRF) analysis. The basal spacing among interlayers of the MVerm material characterized by XRD was 1.169 nm. XRF results showed that the chemical composition of the as-synthesized MVerm was closest to the NVerm when the molar ratio of Si/Na was adjusted to 1/2.5. Furthermore, TG-DSC results indicated the as-synthesized MVerm exhibited similar thermal properties with other layered silicate materials.

    更新日期:2018-11-30
  • Viscoelastic and Drop-Weight Impact Properties of an Acrylic Resin Matrix Composite and a Conventional Thermoset Composite — a Comparative Study
    Mater. Lett. (IF 2.687) Pub Date : 2018-11-30
    Winifred Obande, Dipa Ray, Conchúr M.Ó. Brádaigh

    Novel reactive thermoplastic resin systems such as Elium® have attracted significant research attention for composite applications because they combine the low-cost processibility of thermosets and the recyclability of TPs. In this work, the viscoelastic and impact behaviours of glass fibre-reinforced composites, containing Elium® and a commercial epoxy matrix were evaluated. To complement observations from both characterisation techniques, the fracture characteristics of both materials were also investigated by scanning electron microscopy.

    更新日期:2018-11-30
  • Magnetically driven robust polarization in (1-x)BiFeO3-xPbTiO3 multiferroic composites
    Mater. Lett. (IF 2.687) Pub Date : 2018-11-30
    Muhammad Sufyan, Shahid Atiq, Syed Kumail Abbas, Muhammad Younis, Saira Riaz, Shahzad Naseem

    In this letter, we demonstrate an apparent magnetically activated electric polarization reorientation at room temperature through magneto-electric coupling in (1-x)BiFeO3-xPbTiO3 (x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5) composites. A change in magnetic field causes variation in electric polarization, attributed to the destruction of space modulated spin antiferromagnetic structure with the PbTiO3 addition. This behavior also results in the increase in magnetic parameters as the coercive field of the composites increases with the increase in PbTiO3 contents. The analysis demonstrates that the magneto-electric coupling in the prepared ferromagnetic/ferroelectric composites is dominant at room temperature, quite feasible for modern day devices.

    更新日期:2018-11-30
  • The role of phase transformation route on the intergranular corrosion susceptibility of 2205 duplex stainless steel
    Mater. Lett. (IF 2.687) Pub Date : 2018-11-30
    Nima Haghdadi, Majid Laleh, Ali Kosari, M.H. Moayed, Pavel Cizek, Peter D. Hodgson, Hossein Beladi

    Two types of austenite morphologies, equiaxed and Widmanstätten, were produced through different phase transformation routes to evaluate the critical factors affecting the intergranular corrosion susceptibility in a 2205 duplex stainless steel. These distinct austenite morphologies behaved quite differently in secondary phase precipitation on exposure to sensitization temperature. Although the Widmanstätten microstructure was found to have a larger degree of coherent ferrite/austenite interface area compared with the equiaxed one, it showed a higher degree of sensitization. It was clarified that, in addition to the ferrite/austenite interface coherency, the extent of an interface area and presence of un-stable ferrite also play prominent roles in intergranular corrosion susceptibility.

    更新日期:2018-11-30
  • A novel reduced graphene oxide/epoxy sandwich structure composite film with thermo-, electro- and light-responsive shape memory effect
    Mater. Lett. (IF 2.687) Pub Date : 2018-11-30
    Enliang Wang, Yanglong Wu, Md Zahidul Islam, Yubing Dong, Yaofeng Zhu, Fuyao Liu, Yaqin Fu, Zhaohe Xu, Ning Hu

    Development of multi-responsive shape recovery polymers and their composites is critical and has great potential. In this study, a novel reduced graphene oxide (RGO)/water-borne epoxy (WEP)/RGO sandwich structure composite film was fabricated and investigated. The results showed that the composite film exhibited excellent thermo-, electro- and light-responsive shape memory effect, which has potential applications for the sensors, switching devices, deployable structures, and medical apparatus.

    更新日期:2018-11-30
  • Enhanced AC conductivity and dielectric properties of ultrathin β-silver vanadium oxide/aniline nanowires
    Mater. Lett. (IF 2.687) 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:2018-11-29
Some contents have been Reproduced with permission of the American Chemical Society.
Some contents have been Reproduced by permission of The Royal Society of Chemistry.
化学 • 材料 期刊列表