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  • Effect of prior austenite grain size on isothermal bainite transformation in 65Cr steel
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-12
    Junjie Sun; Yingjun Wang; Shengwu Guo; Yongning Liu

    Isothermal bainite transformation was conducted on both ultrafine-grained (UFG) and normal-grained (NG) 65Cr steels. Both bainite morphology and transformation rate are greatly influenced by prior austenite grain size. Bainite transformation rate is greatly retarded in the UFG steel with average grain size of 4.6 μm. Lower bainite was obtained for both UFG and NG steels when austempered at 250 °C and 300 °C; however, the bainite morphology changed from lower to upper banite for UFG steel when austempered at 400 °C, and lower bainite was still obtained in NG steel. This phenomenon is caused by austenite yield strength increase due to grain refinement.

    更新日期:2020-02-12
  • One-pot synthesis of core-shell structured SSZ-13 zeolite using aluminum isopropoxide as an aluminum source
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-12
    Liancheng Bing; Fangni Li; Qiang Li; Yani Lei; Shengfu Ji; Dezhi Han; Fang Wang; Guangjian Wang
    更新日期:2020-02-12
  • 更新日期:2020-02-12
  • Hydrothermal synthesis of novel nickel oxide@nitrogenous mesoporous carbon nanocomposite using costless smoked cigarette filter for high performance supercapacitor
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-12
    Mohd Ubaidullah; Jahangeer Ahmed; Tansir Ahmed; Shoyebmohamad F. Shaikh; Saad M. Alshehri; Abdullah M. Al-Enizi

    Novel nickel [email protected] mesoporous carbon ([email protected]) nanocomposite (NC) has been synthesized from the hydrothermal method using costless smoked cigarette filter as a source of nitrogenous carbon. The prepared [email protected] shows high surface area (∼1843 m2/g) with excellent mesoporous (∼12 nm) nature. The [email protected] exhibits brilliant electrochemical performance in super-capacitors and stability up to 4000 segments. The specific capacitance of [email protected] was found to be ∼740 F/g at 1 A/g in 6M KOH.

    更新日期:2020-02-12
  • Atomistic study of 12¯10-oriented interfacial crack behaviors in Mg bicrystal
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-12
    Qun Zu; Hanxin Gong; Shuo Liu; Shuiqing Liu

    In this study, 12¯10-oriented interfacial crack behaviors and mechanical properties of Mg bicrystal subjected to uniaxial tensile deformation are systematically studied by molecular dynamic (MD) simulation. According to the simulation results, the behaviors of 12¯10-oriented crack associated with {101¯1} twin boundary (TB), {101¯2} TB and basal/prismatic (BP) interface show a strong dependence on the crystalline orientation of Mg. For the bicrystals with TB, the brittle and ductile fracture rely on the competition of dislocation emission and cleavage at the crack-tip under low temperature. The brittle-ductile transition can be observed with the increased temperature. Interestingly, the BP transformation dominates the initial plastic deformation for Mg bicrystal with BP interface which accompanies the boundary migration under tension. The boundary migration mechanism is revealed to influence on the interfacial cracking behavior and the correlative mechanical property of materials.

    更新日期:2020-02-12
  • Preparation of a self-healing silicone coating for inhibiting adhesion of benthic diatoms
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-12
    Miaosen Yang; Yuhang Sun; Guangmeng Chen; Guangyao Wang; Songzhu Lin; Zhiyong Sun

    This work reports a silicone coating (PDMS-UIa) with marine antifouling and self-healing properties, which was prepared by the first synthesis of polydimethylsiloxane polymer containing imine and urea groups and then adding a small amount of eco-friendly antifoulant. The characteristic structure of the polymer was verified via Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (NMR). The PDMS-UIa coating has rapid self-repairing performance, excellent transparency and the ability to control the release of antifouling agents at a certain rate. The adhesion experiment using four typical benthic diatoms indicated that the PDMS-UIa coating can effectively inhibit the attachment of diatoms, which effectively improves the static antifouling ability of silicone materials.

    更新日期:2020-02-12
  • Pseudocapacitive Quantum Dots Confined in Sacrificial g-C3N4 Derived Carbon Nanosheets for High Performance Ionic Liquid-based Supercapacitors
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-12
    Cheng Yang; Jing Liu; Xuefeng Song; Liping Zhao; Peng Zhang; Lian Gao

    Assembling supercapacitors (SCs) using high-voltage ionic liquid (IL) as electrolyte is an effective strategy to enhance the energy density of SCs. Herein, a novel pseudocapacitive quantum dots (QDs)-based electrode with superior electrochemical behaviors in IL electrolyte has been put forward. Remarkably, FeOOH QDs (FQDs) are effectively confined in a two-dimensional (2D) nanospace supported by porous N-doped carbon (PNC) derived from graphitic carbon nitride (g-C3N4). Beneficial from the abundant active sites and high surface wettability, the resultant FQDs/PNC electrode exhibits sufficient redox reaction and favorable electrochemical kinetics in IL electrolyte. As a result, it can deliver a large specific capacitance of 210.6 F g-1 and still retain 82.2% of its initial capacitance after 10000 cycles.

    更新日期:2020-02-12
  • Anti-proliferative and anti-migratory effects of flower-like bimetallic (Au@Pt) nanoparticles
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-12
    Sebastian Xavier; Puja Patel; Manimaran Nadar Vinita; Umapathy Devan; Antony Joseph Velangani; Sunita Sinha; Rathinam Yuvakkumar; Palanivelu Velmurugan; Arumugam Veera Ravi; Muthusamy Govarthanan; Ponnuchamy Kumar
    更新日期:2020-02-12
  • An ultra-high strength Mg-3Al-Zn alloy with low tension-compression yield asymmetry
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-10
    J. Feng; X.W. Li; H.F. Sun; W.B. Fang

    An ultra-high strength Mg-3Al-Zn alloy with low tension-compression yield asymmetry was successfully fabricated through adding 0.2 wt % MgO. The as-extruded alloy exhibits a tensile yield stress of 459 MPa, an ultimate tensile strength of 519 MPa, an elongation to failure of 3.2%, and a low tension-compression yield asymmetry of 1.01. The combined effect of partially nanocrystallized structure, nanoscale and coherent MgO precipitates, and ultra-fine recrystallized Mg grains results in the ultra-high strength and further results in the low tension-compression yield asymmetry with additional effect of weak basal texture.

    更新日期:2020-02-10
  • Enhancements of luminescent properties of CaTiO3: Dy3+,Pr3+ via doping M+= (Li+, Na+, K+)
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-10
    Qian Yin; Kehui Qiu; Yu Chen; Jiaming Liu; Xuan Xiao

    A series of phosphors CaTiO3:Dy3+,xPr3+ (x = 0-3mol%) and CaTiO3:Dy3+,0.1mol%Pr3+,yM+ (M+ = Li+, Na+, K+, y= 1-7mol%) were synthesized via combustion method. The results indicate that the incorporation of Pr3+ reduced the luminescence intensity of Dy3+ slightly, but it adds a red emission. Meanwhile, the best concentration of Pr3+ is 0.1 mol%. In order to enhance the luminescence intensity, Li+, Na+ and K+ are selected to incorporate into CaTiO3 host. It is compared the comprehensive property which includes photoluminescence intensity, the CIE coordinate and correlated color temperatures. It concluded that Li+ is better doping substance than Na+ and K+ ions in CaTiO3:Dy3+,0.1mol%Pr3+. It also calculates some spectroscopic parameters via judd-ofelt theory based on the optimal charge compensator phosphor.

    更新日期:2020-02-10
  • Surface modification of polypropylene with porous polyacrylamide coating
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-10
    Jidong Dai; Min Liang; Pengfei Ren; Yifu Fu; Faming Wang; Xin Ge; Tianzhu Zhang

    In this work, PAM/PDA composite coating with porous structure is proposed for the polypropylene (PP) surface modification. Polymerization induced phase separation (PIPS) method cooperated with mussel-inspired dopamine (DA) is all applied in this process. With the assistance of the DA, PAM coatings can firmly adhere to the PP surfaces. After adding dopamine, the Young’s modulus of the PAM/PDA coating is decreased by two-thirds and the elastic modulus increased more than doubled.

    更新日期:2020-02-10
  • Ultrasound-induced transient liquid-phase bonding of Mg/Cu dissimilar metals with Zn interlayer in air
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-10
    Zhiyong Mao; Tianxing Niu; Qian Wang; Yong Nie; Jiuchun Yan; Jingwen Deng; Yue Li

    Magnesium alloys and copper dissimilar metals were welded by ultrasound-induced transient liquid-phase bonding (U-TLP) with a Zn interlayer in air. The effects of the ultrasound on the microstructure and mechanical properties of the weld seam were studied. The formation of the interface on the AZ31B Mg side (AZ31B), and the morphology of microstructure and composition evolution of the weld seam were analyzed. The formation of the eutectic liquid phase was observed after an ultrasonic vibration of only 1 s. The α-Mg was observed in weld seam. The eutectic structure gradually changed from a mixed state with a granular and layered eutectic structure to a layered eutectic structure, and the highest average shear strength obtained in this study was 63.67 MPa. The fracture was brittle and occurred at the interface between Cu5Zn8 and CuMgZn on the Cu side.

    更新日期:2020-02-10
  • Enhanced strength and ductility of nano-grained titanium processed by two-step severe plastic deformation
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-10
    Hongfei Wang; Chunyan Ban; Nannan Zhao; Yiyao Kang; Tipeng Qin; Sitong Liu; Jianzhong Cui

    Nano-grained pure titanium was produced using two-step severe plastic deformation. The nano-grained pure titanium exhibits an excellent mechanical properties that are comparable or even higher than the equivalent properties of conventional Ti-6Al-4V alloy. A significant fraction of nano-scale grains and non-equilibrium grain boundaries appears to enable deformation by grain boundary sliding, which promotes an increase in ductility of the nano-grained pure titanium. The strength improvement is derived from the grain refinement.

    更新日期:2020-02-10
  • Preparation of tin-zinc alloy foam
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-10
    Wei Zhao; Si-yuan He; Yi Zhang; Chen Zhang; Guo-yi Tang; Ge Dai

    The low melting point tin-zinc (Sn-9Zn) alloy foam was successfully prepared by direct foaming method. Titanium hydride and calcium are proved to be practicable as blowing agents and melt foam stabilizers respectively. The microstructure investigation on cell walls indicated that the formation of calcium stannate (CaSnO3) plays a key role in cell wall formation and bubble stabilization, apart from the particles derived from foaming agents. Quasi-static compressive curves of Sn-Zn alloy foams are characterized by three stages: elastic deforming, large plastic deforming and densification stage, indicating an outstanding energy absorption capability.

    更新日期:2020-02-10
  • Phyto-synthesis of CuO nano-particles and its catalytic application in C-S bond formation
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-10
    Duraipandi Devi Priya; Selvaraj Mohana Roopan; Sehajpreet Singh; Jatin Bansal; Shajahan Shanavas; Maksudur Rahman Khan; Naif Abdullah Al-Dhabi; Mariadhas Valan Arasu; Veeramuthu Duraipandiyan
    更新日期:2020-02-10
  • Advancing the mechanical properties of Si/B co-doped boron carbide through TiB2 reinforcement
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-08
    Qirong Yang; Azmi Mert Çelik; Jun Du; Jerry C. LaSalvia; Chawon Hwang; Richard A. Haber
    更新日期:2020-02-10
  • Epitaxial growth of CoSb3 Skutterudite on copper sheet by molten salt electrolysis
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-08
    Wei Wei; Yuan Li; Han Yang; Ping Che

    In this study, copper sheets were used to induce the epitaxial growth of the CoSb3 and Y filled CoSb3 skutterudite films with controlled filling fraction by molten salt electrolysis. And their thermoelectric properties were studied as well. As CoSb3 skutterudite is a metastable compound, the cubic structure of copper can induce the formation of cubic structure of CoSb3 under 80°C rather than CoSb2 of orthorhombic structure and CoSb of hexagonal structure. The thermoelectric properties of the CoSb3 skutterudite were investigated in the temperature range of 300-800 K. It was found that the filling of Y can obviously improve the thermoelectric properties of CoSb3 skutterudite. The thermoelectric figure of merit (ZT) of Y0.1CoSb3 skutterudite is 20 times higher than that of unfilled CoSb3 at 773 K.

    更新日期:2020-02-10
  • Facile and rapid preparation of hexagonal boron nitride via microwave heating method and its application in photocatalytic H2 evolution
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-08
    Lu Chen; Pengfei Chen; Xiaoquan Dai; Wenqian Zhang; Pingxing Xing; Yiming He
    更新日期:2020-02-10
  • Antimicrobial effect of chlorhexidine-releasing porous hydroxyapatite scaffold incorporated with human serum albumin nanoparticles
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-08
    Da Hye Kim; Jun Sik Son; Tae-Yub Kwon

    A novel antibacterial hydroxyapatite (HAp) scaffold was developed by immobilizing chlorhexidine (CHX)-loaded human serum albumin (HSA) nanoparticles on its surface via surface charge interaction using polyethylenimine (PEI). The CHX-loaded HSA nanoparticles were fabricated using a desolvation method, coated with PEI molecules (PEI-CHX-HSA), and immobilized via charge interaction on the scaffold surface. The PEI-CHX-HSA nanoparticles were observed to be well-dispersed on the scaffold surface. The agar diffusion test showed a clear inhibition zone of Streptococcus mutans around the nanoparticle-immobilized scaffold. The antibacterial activity of the scaffold was also confirmed in the S. mutans adhesion study using scanning electron and fluorescent microscopy. The results suggest that the HAp scaffold with immobilized PEI-CHX-HSA nanoparticles showed effective drug releasing behavior and antibacterial activity against S. mutans.

    更新日期:2020-02-10
  • Elucidating the effects of microsegregation on the precipitation phenomena in as-cast Nb-bearing superalloy
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-08
    Mohsen Rafiei; Hamed Mirzadeh; Mohammad Javad Sohrabi
    更新日期:2020-02-10
  • Enhanced Flexibility of Conductive Layer with Inkjet-Imprinted Microstructure Surface
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-08
    Chenghu Yun; Fuqiang Chu; Bo Cui; Xin Wang; Guangping Liu; Jiazhen Sun
    更新日期:2020-02-10
  • New materials in semiconductor tensometry
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-07
    M.A. Bronovets; N.M. Volodin; Yu N. Mishin

    The scientific and technological progress in space engineering, creation of new supersonic aircrafts, nuclear power and other modern industries require the development of methods of measuring forces, deformations, stresses and other parameters of devices and equipment. The most important problems here are more accurate forecasting of reliability and resource work equipment in a wide range of stresses, temperature, environment, the influence of various physical fields (acoustic, electromagnetic, radiation etc.) and other external factors. In this manuscript introduced potential applications of samarium monosulfide in the fields of small deformations, low weight, minimum dimensions, as well as radiation resistance, which is especially important for space tribology.

    更新日期:2020-02-07
  • Ultraviolet light-driven controllable doping of graphene quantum dots with tunable emission wavelength for fluorescence bio-imaging
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-07
    Zihao Wang; Zhiduo Liu; Bingli Gu; Bo Gao; Ting Wang; Xiaohu Zheng; Gang Wang; Qinglei Guo; Da Chen

    As an important approach for tuning the emission wavelength of graphene quantum dots (GQDs), controllable doping has attracted a great deal of attentions. Here, we reported an ultraviolet light-driven doping approach for GQDs at room temperature. N-doped graphene quantum dots (N-GQDs) are obtained via the reaction in dimethylformamide under the ultraviolet radiation. The emission wavelength can be tuned from 566 to 463 nm by controlling the doping concentration. The quantum yield of N-GQDs is demonstrated to be much higher than that of most reported GQDs and increases with the increase of the doping concentration. Finally, the synthesized N-GQDs are explored for the application in fluorescence bio-imaging.

    更新日期:2020-02-07
  • Hot-hardening phenomenon in die steel during thermomechanical processing
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-07
    A.A. Krugljakow; S.A. Nikulin; S.O. Rogachev; Hoan Xuan Nguyen; N.V. Lebedeva; G.A. Panova

    The behavior during hot deformation of a new Si-Cr-Ni-Mn-V-Ti-Nb die steel in the temperature range of 450–750 °C was studied. The true sress-strain curves for the steel during hot compressive deformation were plotted. It has been experimentally shown that the steel is prone to hot hardening.

    更新日期:2020-02-07
  • Atmospheric corrosion behavior of copper under static magnetic field environment
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-07
    Xueyong Yu; Zehua Wang; Zihan Lu

    This study investigates the effect of static magnetic field on the corrosion of copper. Tests are performed in NaCl solution under thin electrolyte layer at room temperature. Electrochemical impedance spectroscopy (EIS) is used to investigate the electrochemical behavior. SEM and XPS are used to analyze corrosion products. Results show that the magnetic field reduces the ability of ions to migrate from thin electrolyte layer to electrode surface, and inhibits the formation of CuO and soluble copper chloride.

    更新日期:2020-02-07
  • Synthesis and physicochemical properties of a promising non linear optical metal organic crystal: Bis – L- alanato zinc (II)
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-07
    A. Parvathi Priya; V. Srinivasan; R. Subhashini; A. Vijayalakshmi

    An exceedingly transparent semi organic NLO active material Bis (L-alanato) Zinc - II (BLALZ), was synthesized lucratively and grown by low temperature solution growth technique. X- ray diffraction analysis confirms that the compound crystallizes in the monoclinic crystal system with the space group of P21. Fourier Transform - Infrared spectroscopic study was carried out to elucidate the functional groups of BLALZ crystal. Thermal analyses (TG-DTA) confirmed the thermal stability of the title compound. The UV-Vis-NIR spectral study showed that the grown crystal is transparent in the entire visible region with the lower cut-off wavelength of 300 nm. The SHG efficiency of BLALZ crystal was found to be 0.3 times that of KDP. LDT value was found to be 30.49 GW/cm2.

    更新日期:2020-02-07
  • Influence of single-walled carbon nanotubes functionalization in photocatalytic performance of pyramidal porous silicon: Experimental evidence
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-07
    Haythem Gammoudi; Fatma Belkhiria; Afrah Bardaoui; Ibtissem Ben Assaker; Hassan Saadaoui; Mosbah Amlouk; Touria Cohen-Bouhacina; Radhouane Chtourou

    Pyramidal porous silicon (pPSi) synthesized through wet-chemical etching of doped silicon wafer with a large surface area and a wide absorption spectrum are used as a photocatalyst for the photodegradation of methylene blue (MB). The photocatalytic activity of pPSi has been enhanced using single-walled carbon nanotubes (SWCNTs). The role of the SWCNTs on the observed photocatalytic activity enhancement was investigated by analyzing the effect of carbon nanotubes density. SWCNTs loaded in pyramidal porous silicon exhibits a much important photocatalytic activity (52.21% MB degradation in 90 min) in comparison to bare pPSi (11.51% MB degradation in 90 min) under UV light irradiation. This novel nanocomposite can be used as effective photocatalyst for photocatalytic degradation of organic dyes and toxic pollutants and thus is of significant interest for water treatment.

    更新日期:2020-02-07
  • Ferrous-cupric oxalate hydrate combined with multiwalled carbon nanotubes composite anodes for lithium-ion batteries
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-07
    Keyu Zhang; Geng Gao; Yin Li; Yunke Wang; Ruhui Xu; Yongnian Dai; Yaochun Yao

    Ferrous-cupric oxalate hydrate/multiwalled carbon nanotubes composite was prepared by solvothermal method and self-assembly technique. The structural and morphological characterization show that the CuC2O4·yH2O with three-dimension spherical shape is uniformly dispersed among the microrod-liked FeC2O4·2H2O particles embedded by carbon nanotubes. Cu nanoparticles fabricated in first few cycles and carbon nanotubes provide a high conductivity, enhance electrical path for electrochemical reaction and improve the activity of complex nanocomposites, thus resulting in good lithium storage performance: 530 and 482 mAh g-1 at current densities of 0.5 and 2 A g-1 after 200 cycles. This unique design can shorten the preparation process, completely solve the decomposition of oxalate matrix and improve the homogeneity of synthetic materials.

    更新日期:2020-02-07
  • 更新日期:2020-02-07
  • Crystal structure and microwave dielectric properties in CoO-SnO2-Nb2O5 system
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-06
    Yun Zhang; Shihua Ding; Tianxiu Song; Yingchun Zhang
    更新日期:2020-02-07
  • Effect of Mn substitution on the crystal and magnetic structure of Bi1-xCaxFeO3-x/2 multiferroics
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-06
    V.A. Khomchenko; D.V. Karpinsky; M.V. Bushinsky; D.V. Zhaludkevich; A. Franz; M.V. Silibin
    更新日期:2020-02-07
  • 更新日期:2020-02-06
  • Preparation and Performance of Fast-response ITO/Li-NiO/Li-WO3/ITO All-solid-state Electrochromic Devices by Evaporation Method
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-05
    Wenjie Li; Xiang Zhang; Xi Chen; Yingming Zhao; Lebin Wang; Dongqi Liu; Xin Li; Mingjun Chen; Jiupeng Zhao; Yao Li
    更新日期:2020-02-06
  • Preparation and properties of high refractive index UV-cured titanium hybrid optical materials
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-05
    Xucan Hu; Bolong Yao; Jing Liu; Jiacheng Liu; Kun Chen; Meng Yan; Likui Wang

    In this study, a new synthetic route was developed to prepare UV-cured titanium hybrid optical materials. Transparent high refractive index titanium hybrid optical materials were prepared by means of non-hydrolyzed sol-gel and UV curing. The experimental results show: titanium was successfully introduced into the silicone chain in the form of Ti-O-Si chemical bonds. The materials have high light transmittance (>95%) in the visible light region, high thermal stability and tunable refractive index (1.6533–1.8145) at 486 nm. Our study provides a new ideal for preparing high refractive index UV-cured titanium hybrid optical materials for potential optical applications.

    更新日期:2020-02-06
  • Synthesis amorphous TiO2 with oxygen vacancy as carriers transport channels for enhancing photocatalytic activity
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-05
    Tao Jia; Jing Zhang; Jiang Wu; Daolei Wang; Qizhen Liu; Yongfeng Qi; Bin Hu; Ping He; Weiguo Pan; Xuemei Qi
    更新日期:2020-02-06
  • Synthesis of functional mesoporous carbon microspheres with honeycombed interior structure through dual template
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-05
    Dawei Liu; Penggang Lv; Anjin Yang; Long Xu

    In the present study, we report a novel dual template approach to prepare N-doped carbon microspheres with highly accessible mesopores and honeycombed interior structure via taking advantage of the surfactant-directed assembly within Pickering emulsion droplets. The resultant carbon microspheres possess ordered mesopores (∼7 nm), uniform macropores (∼1 μm), a high N content (∼7.8 wt%) and a high surface area (∼535 m2 g−1). The sizes of macropores can be easily manipulated by adjusting the amount of F127. Moreover, the microspheres show enhanced performance as supports for catalytic hydrogenation.

    更新日期:2020-02-06
  • Influence of hot isostatic pressing (HIP) on mechanical properties of magnesium alloy produced by selective laser melting (SLM)
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-05
    Shuai Liu; Hanjie Guo

    Microstructure and mechanical properties of AZ61 magnesium alloy prepared by Selective laser melting(SLM) and post-processing of the hot isostatic pressing (HIP) have been investigated. And digital image correlation (DIC) based on in-situ tensile experiments were applied. It was found that the hot isostatic pressing treatment significantly influenced the macrostructure, microstructure and tensile properties of the SLM AZ61 magnesium alloy. In particular, the disadvantages of low elongation of magnesium alloys produced by SLM were improved. The porosity decreased after HIP, and elongation was increased by 160% without sacrificing tensile strength of SLM. The microhardness decreased slightly, and the decrease in yield strength is attributed to the growth of grain size.

    更新日期:2020-02-06
  • Seebeck coefficient in multiphase thin films
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-03
    Nouredine Oueldna; Alain Portavoce; Maxime Bertoglio; Marion Descoins; Abdelkhalek Kammouni; Khalid Hoummada
    更新日期:2020-02-03
  • P3HT loaded piezoelectric electrospun fibers for tunable molecular adsorption
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-01
    William Serrano-Garcia; Irene Bonadies; Sylvia Thomas; Vincenzo Guarino
    更新日期:2020-02-03
  • Water vapour permeability of innovative building materials from different waste
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-01
    C. Buratti; E. Belloni; F. Merli

    The hygrothermal performance of building materials is a very important issue for indoor comfort. The aim of this study is to measure the water vapour resistance factor μ of recycled waste materials. Leather cuttings, rice husk, and coffee chaff were used in order to manufacture innovative panels for thermal-noise building insulation. The permeability measurements were carried out by the dry cup method in compliance with the Standard EN ISO 12572. In the experimental campaign, conventional gypsum plaster and expanded polystyrene were also considered, whose hygrothermal characteristics are known from the Literature, in order to verify the reliability of the method. The moisture transfer properties of the innovative panels are higher than the values available in the Literature for other vegetable and mineral fibers-based panels (sheep wool, wood, cork, expanded vermiculite and perlite, glass or stone wool, and so on). However, the high μ-value obtained for coffee chaff panels (equal to 392) could involve an increase in heat loss and acoustically weak points.

    更新日期:2020-02-03
  • Biomicroconcretes based on the hybrid HAp/CTS granules, α-TCP and pectins as a novel injectable bone substitutes
    Mater. Lett. (IF 3.019) Pub Date : 2020-02-01
    Michał Dziadek; Aneta Zima; Ewelina Cichoń; Joanna Czechowska; Anna Ślósarczyk
    更新日期:2020-02-03
  • Improving the mechanical behavior of an ultrafine grained Cu-6.4vol.%NbC nanocomposite by hot rolling
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-31
    Chenguang Li; Wei Zeng; Dengshan Zhou; Jiamiao Liang; Jun Wang; Deliang Zhang

    To improve the mechanical behavior of the ultrafine grained Cu-6.4vol.%NbC nanocomposite rods fabricated by powder compact extrusion, they were hot-rolled into sheets at 800 and 1000 ℃ respectively. Rolling at 800 ℃ caused the ultimate tensile strength (UTS) of the nanocomposite to clearly decrease from 868 to 755 MPa without changing the tensile ductility, while rolling at 1000 ℃ caused a similar change of the UTS, but increased the elongation to failure (ETF) of the nanocomposite drastically, from 6% to 12.6%. Such a significant improvement in ETF while still maintaining a high strength was ascribed to the elimination of the residual unconverted interparticle boundaries and the nanoparticle stablilized nanocrystalline microstructure.

    更新日期:2020-01-31
  • Electrical and magneto-optical characterization of Py/MoS2 bilayer: a facile growth of magnetic-metal/semiconductor heterostructure
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-31
    R. Ghasemi; L. Jamilpanah; E. Faridi; M.R. Hajiali; M. Shafei; S.M. Mohseni; M.M. Tehranchi

    Ferromagnet/two-dimensional transition-metal dichalcogenides (FM/2D-TMDCs) have drawn great attention due to their potential impact in electronics, optoelectronics, and spintronics. However, their fabrication technology is very limited especially when manufacturing of a FM-metal/TMDC-semiconductor element is a purpose. Here, we report a successful demonstration of a NiFe (Py)/2D-TMDC (MoS2) metal/semiconductor bilayer device with a systematic study of its electronic transport and magneto-optical response. The MoS2 with a thickness of 50 nm is grown through electrodeposition technique on a sputter deposited 40 nm Py layer. I-V characterization ultimately demonstrates a Schottky response due to presence of a barrier formed at the interface. Magneto-optical Kerr effect (MOKE) represents a significant amplification as the MoS2 cap-layer formed an optical cavity. In addition, the coercive field of Py/MoS2 bilayer shows a decrease w.r.t. that of the Py layer because of proximity coupling formed at the interface. This study demonstrates not only a successful fabrication of FM-metal/TMDC-semiconductor contact, but also an optical path enhancement due to presence of the TMDC layers for optical and magneto-optical applications.

    更新日期:2020-01-31
  • Recrystallization behavior of Al-Mg-Mn-Sc-Zr alloy based on two different deformation ways
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-31
    Jingyu Jiang; Feng Jiang; Menghan Zhang; Zhongqin Tang; Mengmeng Tong

    The recrystallization behaviour and Al3(Sc, Zr) particles were studied by annealing the samples with different deformation ways. Two samples were studied, cold rolling (CR) and equal channel angular pressing (ECAP). The ECAP sample has higher dislocation density, leading to the results that the ECAP sample is recrystallized thoroughly whereas the CR sample is only recrystallized partly. Additionaly, the morphology of Al3(Sc, Zr) particles are changed after the recrystallization. Almost all the Al3(Sc, Zr) particles in ECAP sample are incoherent and large, losing pinning effect, but those in the CR sample just gow up a bit and pin the grain doundaries (GBs) strongly.

    更新日期:2020-01-31
  • Preparation of black hierarchical porous ZnO and its photocatalytic activity under visible light
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-30
    Changming Yan; Guojun Yan; Wenjing Cheng Data collection; Yu Qiu; Liyu Wang

    Black hierarchical porous ZnO was prepared by oxidation of nano-porous Zn/ZnO sample obtained from the Al-Zn alloy etched in an NaOH aqueous solution, and was characterized by XRD, SEM, TEM, BET, EDS and UV-Vis spectrophotometer measurements. The results showed that the ZnO appeared black in the sunlight and its reflectivity was approximately 19.5% in the wavelength range from 370 nm to 700 nm. The Black ZnO sample exhibited a hierarchical porous structure consisting of nanosheets with uniformly distributed mesopores , that gives rise to a high specific surface area of about 36 m2/g. Compared to the ZnO nanopowders and TiO2 (P25), black porous ZnO exhibited excellent photocatalytic activity in the degradation of a methyl orange solution under visible light.

    更新日期:2020-01-31
  • Microstructures and Charge Carrier Transport of Some Li2O doped Glassy Ceramics
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-30
    Amartya Acharya; Koyel Bhattacharya; Chandan Kumar Ghosh; Sanjib Bhattacharya

    We study electrical conductivity of new Li2O doped glassy ceramics in wide frequency and temperature regime not only for their applicability in various fields like lithium ion conductors but also for academic interest. Here, we employ “Mott’s variable range hopping” model to analyse low temperature dc conductivity data. The microstructures and electrical conductivity of them have been explored and correlated. We do believe that these glassy ceramics are suitable candidates for lithium ion battery application.

    更新日期:2020-01-31
  • Facile bulk synthesis of high performance β-Zn4Sb3 for thermoelectric applications
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-30
    Naval Kishor Upadhyay; Nagendra S. Chauhan; L.A. Kumaraswamidhas; Kishor K. Johari; Bhasker Gahtori; Sivaiah Bathula; Rajesh Reddy; Yury V. Kolen'ko; Sanjay R. Dhakate; Ajay Dhar
    更新日期:2020-01-31
  • Redox behavior and ionic conductivity of Al-doped Sr3LaFe3O10-δ
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-30
    Ekaterina V Tsipis; Mikhail V. Patrakeev; Polina V. Anikina; Eugene N. Naumovich; Vladislav V. Kharton

    Mixed ionic-electronic conductors derived from Ruddlesden-Popper type Sr3LaFe3O10-δ are promising materials for numerous energy- and environment-related applications, such as electrodes of fuel cells, batteries and capacitors. In this work, oxygen deficiency and electrical conductivity of Sr3LaFe3-xAlxO10-δ (x = 0.3-0.6) were studied at 973-1273 K in the oxygen partial pressure range from 10-24 to 0.8 atm. The p(O2)-T-δ diagrams determined by coulometric titration and thermogravimetry, were described by a statistical thermodynamic model taking into account the site-exclusion effects near oxygen vacancies, energetic non-equivalence of different crystallographic sites, and partial localization of electron holes in the vicinity of Al3+ cations. Doping with Al3+ was found to increase oxygen nonstoichiometry under oxidizing conditions and to decrease the electronic charge-carrier concentrations. Although the oxygen vacancy mobility tends to decrease on doping due to stable tetrahedral coordination of Al3+ cations, a moderate increase in the ionic conductivity with respect to parent Sr3LaFe3O10-δ is observed at x = 0.3 and temperatures below 1100 K.

    更新日期:2020-01-31
  • Preparation of SiC nanowires on Graphite Paper with Silicon Powder
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-30
    Liang Hu; Yang Zou; Chen-Hui Li; Jiang-An Liu; Yu-Sheng Shi

    In this study, a novel and catalyst-free preparation method of SiC nanowires (SiC NWs) was proposed. A slurry prepared by mixing silicon powder with ethyl cellulose and methanol was uniformly coated on a graphite paper, which was then kept in vacuum furnace at different temperature to form SiC NWs. The phases, microstructure and the formation mechanism of SiC NWs was investigated. It was found that the SiC NWs was formed with a vapor-solid process, during which the silicon powder particles were gradually sublimated and reacted with C provided by graphite paper to form 3C-SiC NWs. With increasing holding temperature, high amounts of SiC NWs with a large diameter was obtained, and the micro-morphology of which changed from flocculent into curvilinear, and finally linear nanowires.

    更新日期:2020-01-31
  • The effects of oxygen pressure on the structural, magnetic, and ferroelectric properties of 0.55BiFe0.95Ga0.03Mn0.02O3−0.45BaTiO3 thin films
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-30
    Ming-Yuan Yan; Jian-Min Yan; Zhi-Xue Xu; Hui Wang; Meng Xu; Guan-Yin Gao; Fei-Fei Wang; Ren-Kui Zheng

    0.55BiFe0.95Ga0.03Mn0.02O3−0.45BaTiO3 (BFGMO−BTO) thin films have been epitaxially grown on (001)-oriented Nb-doped SrTiO3 (NSTO) single-crystal substrates by the pulsed laser deposition. X-ray diffraction, SAED, magnetic hysteresis loop, and piezoresponse force microscopy results show that the structural, and magnetic properties of the BFGMO−BTO epitaxial films can be progressively tuned by the oxygen pressure (PO2) during film deposition. For the films prepared at PO2=5 Pa phase separated into BFGMO and BTO phase, however, with increasing PO2 to 20 Pa the film evolves from two phases to single phase with the best crystalline quality, largest saturation magnetization, lowest coercive field and relatively easy-switchable ferroelectric domains.

    更新日期:2020-01-31
  • Microstructures and magnetic properties of PrFeB/Fe7Co3 nanocomposite magnets
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-29
    Hewei Ding; Chunxiang Cui; Jibing Sun; Wei Yang

    Fe7Co3 with the highest magnetic moment is considered as the best soft magnetic phase. In addition, the domain wall energy of a PrFeB nanocomposite has been calculated to be higher than that of a NdFeB nanocomposite. Against this background, we investigated the influence of Pr content on the microstructures and magnetic properties of nanocomposite PrFeB/Fe7Co3 ribbons prepared by melt-spinning. A Pr content of 10 at% was found to engender hot-annealed ribbons with optimal magnetic properties; this material exhibited a remanence (Jr) of 0.59 T, a coercivity (Hci) of 548.3 kA/m, and a maximum magnetic energy product (BH)max of 69.3 kJ/m3. Furthermore, the volume fraction of the Fe7Co3 phase was calculated using an exchange coupling model.

    更新日期:2020-01-30
  • Development of High Strength and High Electrical Conductivity Cu/Gr Composites through Friction Stir Processing
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-29
    R. Bheekya Naik; K. Venkateswara Reddy; G. Madhusudhan Reddy; R. Arockia Kumar

    The Copper/Graphene (Cu/Gr) composite was prepared with single-pass friction stir processing. The composites were prepared by fixing the tool rotational speed and by varying the traverse speed. The stir-zone of processed specimens were characterized for its microstructure, hardness and electrical conductivity. Microstructural investigation showed that graphene has uniformly distributed in the Cu-matrix. The hardness increased by up to 40% after FSP. A minimal decrease in electrical conductivity was observed after friction processing. The study showed FSP is a promising method to improve the mechanical properties of Cu without much deterioration in electrical conductivity.

    更新日期:2020-01-30
  • Na incorporation controlled single phase kesterite Cu2ZnSnS4 solar cell material
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-29
    Jie Zeng; Ke Liao; Zequn Chen; Yue Hu; Li Qin; Xiaoxin Li; Jianmei Xu; Ling Zhao; Wei Zhou; Qing Wang; Jian Sun

    It is theoretically and experimentally challenging to fabricate single phase Cu2ZnSnS4 (CZTS) and more difficult to synthesize it by sol-gel method. Theoretical work reveals that Na can passivate the dangling bonds in the grain boundaries of CZTS and thus enhance the photovoltaic performance. Therefore, Na incorporation may be an effective way in passivating defects in CZTS films and fabricating CZTS with high quality and single phase. In this study, we will try to incorporate Na into CZTS films by sol-gel method to help passivate defects in CZTS and achieve single phase kesterite CZTS films using a different solvent 2-methoxybutanol. Different Na/(Cu+Zn+Sn) atomic ratios (0%-3%) will be employed. Through controlling Na incorporation amount in solution, we can prevent the generation of other phases like SnO2 and a pure single phase kesterite CZTS can be achieved. The optical band gap of the optimal CZTS film is 1.24 eV. All Na doped CZTS films show p-type conduction behavior.

    更新日期:2020-01-30
  • Simultaneously enhancing mechanical properties and electrical conductivity of aluminum by using graphene as the reinforcement
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-29
    Shuai Zhang; Gaoqiang Chen; Timing Qu; Gang Fang; Shengwen Bai; Yufan Yan; Gong Zhang; Zhaoxia Zhou; Junjun Shen; Dawei Yao; Yuanwang Zhang; Qingyu Shi

    In this study, we demonstrated simultaneously enhanced mechanical properties and electrical conductivity of pure aluminum (Al) by incorporating graphene as the reinforcement. The graphene/Al nanocomposite was fabricated by friction stir processing (FSP) combined with hot extrusion. It was found that graphene was homogeneously dispersed into Al matrix and directly bonded graphene/Al interfaces were formed, which were the structure basis for the simultaneously improved electrical and mechanical properties. This study provides new strategy for fabricating high-strength and highly conductive graphene/Al nanocomposites.

    更新日期:2020-01-30
  • Aerosol deposition of thin-film solid electrolyte membranes for anode-supported solid oxide fuel cells
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-29
    I.S. Erilin; D.A. Agarkov; I.N. Burmistrov; V.E. Pukha; D.V. Yalovenko; N.V. Lyskov; M.N. Levin; S.I. Bredikhin

    Development of a reliable, easily scalable and economically feasible technology for thin-film solid electrolyte fabrication is critical for the industrial production of solid oxide fuel cells (SOFCs). In the present work, the aerosol deposition (AD) technique has been appraised for this role. The thin-film membranes of 8 mol.% yttria-stabilized zirconia (8YSZ) solid electrolyte were applied onto two-layer anode supports, with subsequent screen-printing of the composite cathodes made of (La0.8Sr0.2)0.95MnO3-δ (LSM) and zirconia co-stabilized with 10 mol.% scandia and 1 mol.% ceria (10Sc1CeSZ). High quality of the thin membranes produced by the aerosol deposition was confirmed by scanning electron microscopy and electrochemical measurements, including the measurements of current-voltage dependencies and impedance spectroscopy. At 850°C, the anode-supported SOFCs with wet hydrogen as fuel and air as an oxidant demonstrated the open-circuit voltage above 1.04 V, whilst the power density was higher than 500 mW/cm2.

    更新日期:2020-01-30
  • Bioactive ophiopogonin release form bioglass-collagen-phosphatidylserine scaffolds to enhance bone repair in vitro
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-28
    Chunrong Yang; Huazhong Wu; Guanghui Li

    The goal of this study is to construct bone scaffolds with neuroregulatory function. The scaffolds were prepared using bioglass (BG) powder, collagen (COL) solution, phosphatidylserine (PS) and ophiopogonin loaded COL microspheres as the main components. Combinatorial processing techniques involving chemical-crosslinking and freeze-drying were used. The resultant scaffold constructs were characterized in terms of their morphology, drug release kinetics, pharmacological and biological activities for osteoblast and neurocyte. The microporphology observation showed that the scaffolds had highly interconnected pores, favorable drug release kinetics in view of low initial release and slow average release rate. Moreover, cell studies showed that the involvement of ophiopogonin contributed to the proliferation and mineralization of MC3T3-E1 cells, and the neurite outgrowth of neuron. The drug-loaded composite scaffolds may therefore be a potential replacement in bone-tissue engineering.

    更新日期:2020-01-30
  • Synthesizing surface modified hydroxyapatite embedded in three-dimensional graphene oxide networks for drug loading
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-28
    Mi Tang; Siqi Liu; Lan Luo; Fang Cao; Congjun Wang; Rigui Chen; Juan Shen
    更新日期:2020-01-30
  • Quick synthesis of homogeneous Nb2O5 nanorod arrays via a microwave-assisted hydrothermal method
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-28
    Thais Lemes Ruwer; Janio Venturini; Sherdil Khan; Carlos P. Bergmann

    Homogeneous nanostructures of Nb2O5 were synthesized rapidly using a microwave-assisted hydrothermal method. Niobium plates were used as raw materials without the addition of corrosive HF nor any directing agent. The composition and morphology of the structures were determined by scanning electron microscopy (SEM), X-ray diffraction (XRD), and UV-vis and Raman spectroscopies. The results show that microwave irradiation reduced synthesis time from several days to 2 h. SEM images reveal the formation of structured nanorod arrays at 200 °C. The optical band gap of the nanorods suggests a large-gap semiconducting behavior. These results indicate that the microwave-assisted hydrothermal method is a fast and cheaper technique for the production of homogeneous Nb2O5 nanorod arrays.

    更新日期:2020-01-30
  • Investigations of structural and optical properties of Bi2-xCrxS3 nanocrystals embedded in host glass
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-28
    Éder V. Guimarães; Hanna D. Mikhail; Anielle C.A. Silva; Noelio O. Dantas; Ricardo S. Silva

    The optical and structural properties of Cr-doped Bi2S3 nanocrystals embedded in host glass were investigated. Transmission electron microscopy images and energy dispersive X-ray spectroscopy confirm the formation of the Bi2-xCrxS3 nanocrystals and the presence of the Bi, S and Cr elements. Raman spectroscopy reveal changes of structural crystalline in function of xCr-concentration in Bi2-xCrxS3 nanocrystals. Ultraviolet and visible spectra reveal the effects of quantum confinement with the change in size of nanocrystals. Optical properties of Cr-doped Bi2S3 nanocrystals are different in relation non-doped Bi2S3 nanocrystals. Density functional theory simulations were carried out for bulk undoped and Cr-doped Bi2S3. The unit cell volume reduces with Cr-doping, and the indirect band gap decreases from 1.17 eV (Bi2S3 undoped) to 0.67 eV for Bi2S3:CrBi1 and 0.43 eV for Bi2S3:CrBi2. For both Cr-doped structures, a spin contribution to the magnetic moment of 3.0 µB per unit cell containing one Cr atom were obtained. Within the density functional theory accuracy, these results are in agreement with the experimental results for the 3d3 high-spin state of Cr3+.

    更新日期:2020-01-30
  • The arc-discharged Ni-cored carbon onions with enhanced microwave absorption performances
    Mater. Lett. (IF 3.019) Pub Date : 2020-01-28
    Lei Zhang; Qin Zhou; Hongtao Zhao; Chao Ruan; Yujin Wang; Zhigang Li; Yongfu Lian

    Carbon-based microwave absorbers are important for the rapid development of electronic devices. Herein Ni-cored carbon onions with wide particle size distribution were prepared via arc discharge method, and their structures were characterized by electron microscope, X-ray diffraction, Raman spectroscopy. The three-dimension porous structure, thick carbon shell and large number of defects endows Ni-cored carbon onions with various polarization centers that can stimulate multiple dielectric resonances, leading to wide response frequency bandwidth and multiple strong microwave absorption features. It was evidenced that the bandwidths over -10 dB were from 3.4 to 18.0 GHz when the thickness of samples ranged from 1.5 to 5.0 mm.

    更新日期:2020-01-30
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