30 May 2017, Volume 48 Issue 5

    

• Select all
  |

Focuses & Concerns
• Select
  LiCoPO₄-coated Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ as a cathode material with improved columbic efficiency and cyclability for Li-ion batteries

  HE Lei, XU Junmin, ZHANG Changjin

  Journal of Functional Materials. 2017, 48(5): 5001-5006. https://doi.org/10.3969/j.issn.1001-9731.2017.05.001

  Abstract ( ) Download PDF ( ) Knowledge map Save

  LiCoPO₄ coated Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ cathode materials were prepared by the precipitation method. The coated sample demonstrates high initial columbic efficiency of 84.14% and a large reversible capacity of 305.95 mAh/g at 0.1 C (1 C=300 mA/g). Especially, the coated sample demonstrates a better cycling performance, with capacity retention of 88.2% at 1C rate after 100 cycles, which is much better than that of 72.3% in the pristine sample. The improved electrochemical properties have been ascribed to the LiCoPO₄ coating layer, which not only stabilizes the cathode structure, but also protects the Li-rich cathode material from side reaction with the electrolyte and increases the Li⁺ migration rate at the cathode interface.
• Select
  Preparation and electrochemical properties of TiH₂ and V_0.6Ti_0.23Cr_0.05Fe_0.12H₂ composite metal hydride as anode materials in lithium-ion batteries

  JIANG Haibo, HUANG Liwu, WU Chaolin, WU Lin, HUANG Ju, CHEN Yungui

  Journal of Functional Materials. 2017, 48(5): 5007-5010. https://doi.org/10.3969/j.issn.1001-9731.2017.05.002

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The TiH₂ and V_0.6Ti_0.23Cr_0.05Fe_0.12H₂ composite is prepared by hydrogenation and high energy ball milling. The structure, morphology, specific surface area, conductivities of conductive additives and electrochemical properties of the composite are studied by means of XRD, SEM, BET, Raman and charge and discharge tests. The results indicate that the initial FCC structure of metal hydride has not been changed after high energy ball milling. At a current density of 10 mA/g,the first discharge specific capacity of the composite with conductive additives acetylene black and graphene is 248.2 and 580.6 mAh/g, respectively.
• Select
  Evaluation method of the conductive property of the electrode slurry in semi-solid lithium battery

  FENG Caimei, LIU Dandan, CHEN Yongchong, DU Junjun, ZHANG Ping

  Journal of Functional Materials. 2017, 48(5): 5011-5016. https://doi.org/10.3969/j.issn.1001-9731.2017.05.003

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The semi-solid lithium battery (SSLB) is a new type of electrochemical energy storage technology. The electrode slurry is the key material to realize electrochemical reaction of SSLB, which is made by dispersing the electrode active material and conductive agent in the electrolyte to form hybrid system. The conductive performance of the electrode slurry is important to determine the electrochemical performance. Taking the LiFePO₄ slurry with different ratios of conductive additive as the research target, three methods, the direct current conductivity tester, the electrochemical impedance spectra measurement and the alternating current resistance test at fixed frequency, were used to test the conductive property. The charge and discharge performance of the half cell sat different current densities were conducted and compared. The present results indicate that the electrochemical impedance spectra measurement is an effective method for the evaluation of conductive performance, but the simulation of equivalent circuit reduces the efficiency of this method, while the method of alternating current resistance test at fixed frequency is simpler and the test results are stable. Therefore, the alternating current resistance test at fixed frequency can be used for the evaluation and comparison of conductive properties of the electrode slurry.
• Select
  The netcarbon nanotubessupported nitrogen-doped porouscarbon composite by hydrothermal-assembly method fortheir energy storage properties

  SUN Li, RUAN Xijin, ZHANG Suipeng, LIANG Yuting, YANG Ying

  Journal of Functional Materials. 2017, 48(5): 5017-5022. https://doi.org/10.3969/j.issn.1001-9731.2017.05.004

  Abstract ( ) Download PDF ( ) Knowledge map Save

  In this paper, the carbon nanotubes/nitrogen-doped porous carbon (ACNTs@NPC) composite was fabricatedvia a novel hydrothermal-assembly route. The micro-sized morphology and structureof ACNTs@NPC composite were determined by SEM, TEM, XRD, Raman, XPS and BET methods. Theenergy storage properties were measured via CV, GCD and EIS methods. The result indicated that ACNTs@NPC composite with high surface area (1 039 m²/g)has been successfully synthesized by hydrothermal-assembly process. The ACNTs@NPCcomposite shows excellent energy storage properties of a high specific capacitance of 261 F/g at 1A/g, which is much higher than that of ACNTs (109 F/g) and NPC(214 F/g) materials, and a high energy density of 53.75 Wh/kg at a high power density of 10 500 W/kg.
• Select
  MBE growth and STM analysis of InGaAs quantum dots with As intermittent interruption

  WANG Jihong, LUO Zijiang, ZHOU Xun, DING Zhao

  Journal of Functional Materials. 2017, 48(5): 5023-5027. https://doi.org/10.3969/j.issn.1001-9731.2017.05.005

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Different thickness of InGaAs quantum dots were prepared through intermittent interruption growth(IIG) of As resource in molecular beam epitaxy (MBE) and the morphologies of them were studied and analyzed by reflection high energy electron diffraction (RHEED) and scanning tunneling microscopy (STM). The results show that the uniformity of quantum dots was improved under intermittent interrupt growth and the morphologies of quantum dots were controlled by the growth temperature and the amount of material deposited. A larger amount of material deposited could lead to higher density and more uniformity of quantum dots could be attained at higher growth temperature in a special range. There were three obvious differences phases such as layer-by-layer growth, formation and self-ripen phases of quantum dot and two transition points which were Stranski-Krastanow (SK) and self-ripen transition in the process of growth of InGaAs quantum dots.
Review & Advance
• Select
  Rare-earth upconversion nanoparticals and their applications in bioanalytical chemistry

  WU Jing, XIAO Shuangxi, XU Jianping, WANG Min, CHEN Zhongsheng

  Journal of Functional Materials. 2017, 48(5): 5028-5036. https://doi.org/10.3969/j.issn.1001-9731.2017.05.006

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Rare-earth doping up-conversion nanoparticles (RE-UCNPs) exhibit unique properties, such as low toxicity, weak background fluorescence, high sensitivity, good chemical and optical stability, deep light penetration depth in tissue and large stokes shifts. These RE-UCNPs symbolize a new generation of phosphor nanomaterials. Based on energy transfer types of upconversion, emission mechanism was illustrated in this view. The typical preparation methods and applications in bioanalytical chemistry of UCNPs were reviewed by studying the domestic and international reports. In the application, the detection of biomolecules, hazardous chemicals and metal ions via UCNPs-based fluorescence resonance energy transfer (FRET) were introduced. The detection range and detection limits of analytes were described and summarized. It should be noted that FRET plays an important role in an UCNP based application and more studies regarding the fundamental aspects for FRET with UCNPs is necessary.
Research & Development
• Select
  Study on two-dimensional point defect plasma photonic crystal defect model

  YANG Dongjin, TAN Haiyun, JIN Chenggang, ZHUGE Lanjian, WU Xuemei

  Journal of Functional Materials. 2017, 48(5): 5037-5041. https://doi.org/10.3969/j.issn.1001-9731.2017.05.007

  Abstract ( ) Download PDF ( ) Knowledge map Save

  A two-dimensional triangular lattice photonic crystal resonant-cavity of alumina ceramic rods in air was study. The plasma elements is integrated into the cavity structure. The COMSOL Multiphysics 5.1 software which is based on the finite element method was used to investigate the transmission characteristics of the defect mode of this photonic crystal. The relations between the electron density of plasma, photonic crystal cycle number and transmission spectrum of the defect mode was analyzed. The research results of this paper provided the theory foundation for designing and fabricating Multiple-Channeled Filters.
• Select
  Multifunctional coatings fabricated from electrophoretic deposition of chitosan/tannic acid nanoparticles

  SHI Tiantian, SUN Jiadi, ZHU Ye, MENG Long, WEI Wei, LIU Xiaoya

  Journal of Functional Materials. 2017, 48(5): 5042-5047. https://doi.org/10.3969/j.issn.1001-9731.2017.05.008

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Novel multifunctional coatings were prepared from self-assembled colloidal particles through direct electrophoretic deposition (EPD). The particles were obtained via self-assembly process of chitosan (CS) and tannic acid (TA) in aqueous through hydrogen bonding and electrostatic interactions. The size and morphology of the resulting nanoparticles were successfully studied by transmission electron microscopy (TEM). Multifunctional coating materials were then fabricated in situ on the surfaces of 316L stainless steel by electrophoretic deposition of CS/TA nanoparticles in aqueous. Scanning electron microscopy (SEM) images showed that the particles were uniformly deposited on the surfaces of 316L stainless steel and formed a uniform coating layer. FTIR con?rmed the successful anchoring of CS/TA nanoparticles. Contact angle measurement indicated that the surface hydrophilicity of the substrate was improved by coating materials. More importantly, a fluorescence technique was adopted to qualitative determining the number of L929 cells and bacterial cells adhered on the substrates. The low cytotoxicity of each sample was also evaluated by in vitro test against L929 cells. When directly contacting with bacterial cells, the coatings were able to effectively inactivate both Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria. In addition, when compared to bare 316L stainless steel, these coatings effectively promoted L929 cell adhesion and proliferation on the sample surfaces and exhibited excellent antibacterial activity against E. coli and S. aureus in vitro environment. The above results suggested that the coatings could effectively enhance the cytocompatibility and antimicrobial properties of 316L stainless steel substrate. The contribution of this work lies in the creation of a novel strategy to fabricate a multifunctional coating in view of the versatility of self-assembled colloidal particles and the controllability of the EPD process. It is believed that this work could provide new ideas and reliable data to design novel functional coatings.
• Select
  Parameter influence study of tensile behavior in scarf-repaired composite laminates

  DING Lin, ZHOU Li

  Journal of Functional Materials. 2017, 48(5): 5048-5053. https://doi.org/10.3969/j.issn.1001-9731.2017.05.009

  Abstract ( ) Download PDF ( ) Knowledge map Save

  A finite element model of scarf repaired laminates is built in this paper. The ultimate strengths of the repaired structures are calculated with progressive damage analysis method. The predicted results agree well with the experimental ones, so the model is effective. The failure model of these structures is adhesive failure which is obtained by analyzing the failure process of these structures. The effects of scarf ratio and scarf depth on the ultimate strength are analyzed which indicates that the ultimate strength can be improved by decreasing scarf ratio and scarf depth.
• Select
  Magneticfield calculation and simulation of a cylindrical giant magnetostrictive actuator

  FAN Wentao, LIN Mingxing, JU Xiaojun, WANG Qingdong

  Journal of Functional Materials. 2017, 48(5): 5054-5060. https://doi.org/10.3969/j.issn.1001-9731.2017.05.010

  Abstract ( ) Download PDF ( ) Knowledge map Save

  In order to design a cylindrical giant magnetostrictive actor (GMA), the magnetic field intensity in the cylindrical GMM is calculated using magnetic circuit method. The 3D model of the cylindrical GMA is established by Maxwell software and the influences of the size of each unit in the magnetic circuit are studied. The results show that in a closed magnetic circuit with specific coil turns and current, the length of the GMM has great negative correlation with the magnetic field intensity inside the cylindrical GMM. As for the uniformity, the biggest correlation factors, both of which are negative, are the magnetic permeability of the body through the cylindrical GMA and the length of the magnetic conducting ring.
• Select
  Experimental study to detect the carbon fiber direction in the middle layer using microwave NDT

  YANG Yu’e, AN Yantao, ZHAO Dong

  Journal of Functional Materials. 2017, 48(5): 5061-5064. https://doi.org/10.3969/j.issn.1001-9731.2017.05.011

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Based on the transmission and reflection mechanism of the microwave signal in the multilayer medium, a network analyzer was used to detect the carbon fiber direction in the middle layer of the composite materials. Firstly, the reflection phase difference is calculated according to the reflection phase recorded by N5225A network analyzer. Secondly, the relationship is established between phase difference vs. β. Finally, the reflection phase difference characterization is used to characterize the fiber direction changes. The results show that the angle (α) of the long sides of the rectangular waveguide and the carbon fiber can impact on the test results. The reflection plate in the end of the composite can enhance detection effect. When the angle (α) is different, the relationship between phase difference vs. frequency is different, and the sensitive range to the fiber direction is different as well. When α is 0°, the sensitive range of β is 15~45°. When α is 90°, the sensitive range of β is 45~75°. When the frequency is 33 GHz, and the change of β is 30°,the change of reflection phase difference detected the composite with the reflection plate is 10°, but 5° detected the composite without the reflection plate.
• Select
  Study on magnetic properties of Ni-Zn ferrite doped with rare earth modification

  LIU Zuohua, YIN Jianyun, ZHU Bin, TAO Changyuan, DU Jun

  Journal of Functional Materials. 2017, 48(5): 5065-5069. https://doi.org/10.3969/j.issn.1001-9731.2017.05.012

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The Ni-Zn ferrites were synthesized with sodium jarosite residue through modified method of rare earth doping. The performances were characterized by X-ray diffraction(XRD), scanning electronic microscope(SEM), Fourier transform infrared spectrum(FT-IR) and vibrating sample magnetometer(VSM). The magnetic properties of Ni-Zn ferrite doped with rare earth were investigated. The results showed that the rare earth which has entered into the Ni-Zn ferrites could cause lattice distortion and soft magnetic properties improvement, while the spinel structure was not affected. There was a positive correlation between the amount of dysprosium and the improvement of soft magnetic properties. When the doping amount of dysprosium was 3%, the coercivity, saturated magnetization and remanence of Ni-Zn ferrites are 2.082 kA/m, 42.59 A·m²/kg and 1.73 A·m²/kg, respectively. The Ni-Zn ferrites exhibits best soft magnetic properties.
• Select
  Preparation and properties of chitosan membrane crosslinked by genipin

  JIA Weijian, LI Zhenzhen, DING Shan, LUO Binghong, LI Lihua, ZHOU Changren

  Journal of Functional Materials. 2017, 48(5): 5070-5076. https://doi.org/10.3969/j.issn.1001-9731.2017.05.013

  Abstract ( ) Download PDF ( ) Knowledge map Save

  In this study, chitosan was used as primary materials for its good biocompatibility and a series of cross linked chitosan membrane which have different mechanical properties were prepared by the biological crosslinking agent genipin. The influence of the different experimental conditions on the mechanical properties of the crosslinked membrane and the relationship between the mechanical properties of the membrane and the behavior of the cells were investigated. The results show that the properties of the crosslinked membrane can be affected by the amount of crosslinking agent, reaction temperature and reaction time in different degree, among which the amounts of crosslinking agent affect most obviously. The proliferation and differentiation of pre-osteoblast MC3T3-E1 cultured on two-dimensional membrane materials surface which with different mechanical properties have indicated that the cell proliferation rate increased with the increasing mechanical strength of materials, but decreased when the membrane mechanical strength was too high. However, the osteogenic differentiation ability increased with the mechanical strength increasing.
• Select
  Enhancement of dispersion stability of Tio₂ suspensions by zirconium

  YUAN Xiao, MO Songping, CHEN Ying, JIA Lisi

  Journal of Functional Materials. 2017, 48(5): 5077-5083. https://doi.org/10.3969/j.issn.1001-9731.2017.05.014

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Suspensions of mixed titania (TiO₂) nanoparticles with zirconium phosphate (ZrP) nanoplatelets with diameters of 729.6, 1 004.5 and 1 168.5 nm were prepared. Dispersion stability of the suspensions was studied by Turbiscan LAB, sedimentation experiments and UV-Vis spectrophotometer. Viscosity of the suspensions was measured as well. Results show that the viscosity and stability of TiO₂ suspension was enhanced by adding the ZrP nanoplatelets. The viscosity of the three mixed suspensions was found to be close to one another and the stability of the mixed suspension with the smallest ZrP was the best. It is found that the diameter and aggregation rate of particle aggregates decreased with decreasing diameter of ZrP nanoplatelets. The possible reason is that the steric hindrance for TiO₂ nanoparticles by smaller ZrP nanoplatelets was greater because of higher number density of platelets at the same mass concentration.
• Select
  Colorimetric sensing of Cd²⁺ in aqueous solution based on silver nanoparticles

  ZHAN Junyan, CUI Jianguo, HUANG Yanmin, GAN Chunfang, LIU Zhiping

  Journal of Functional Materials. 2017, 48(5): 5084-5088. https://doi.org/10.3969/j.issn.1001-9731.2017.05.015

  Abstract ( ) Download PDF ( ) Knowledge map Save

  A simple colorimetric method was developed to determine cadmium (II) (Cd²⁺) in aqueous solution, based on 10 nm diameter silver nanoparticles (Ag NPs) synthesized by reduction method with sodium borohydride. Dehydrocholic acid was employed to modify silver nanoparticles with a distinct colorimetric response to Cd²⁺. The presence of Cd²⁺ions induces the aggregation of the modified Ag NPs by the complexation of Cd²⁺ with dehydrocholic acid and results in a color change from yellow to wine-red. The detection limit (3σ) of the method could be as low as 129 nmol/L for Cd²⁺ with linear detection range of 0.9 - 50 μmol/L. Moreover,the method was applied to the determination of Cd²⁺ in drinking water with a visual detection limit of 1 μmol/L. The presented method is promising in the application of onsite fast detection of Cd²⁺ in water.
• Select
  Preparation and photocatalytic performance of Ag-Ag₂O/Bi₂WO₆ photocatalyst

  QIU Shuang, ZHAO Binxia, GUAN Wenbin, NIU Lu, GUO Dan, LIU Yuling, ZHANG Xiaoli

  Journal of Functional Materials. 2017, 48(5): 5089-5093. https://doi.org/10.3969/j.issn.1001-9731.2017.05.016

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Bismuth tungstate (Bi₂WO₆) microcrystalline prepared by a facile hydrothermal method was used to fabricate a new kind of Ag-Ag₂O/Bi₂WO₆ heterojunction catalyst. The structures and morphologies of Ag-Ag₂O/Bi₂WO₆ heterojunction catalysts were characterized by XRD, SEM, TEM and UV-Vis DRS. Photocatalytic performances of Ag-Ag₂O/Bi₂WO₆ were comparatively evaluated from measuring the degradation efficiency of Rhodamine B (RhB) aqueous solution. The results revealed that Ag-Ag₂O/Bi₂WO₆ heterojunction catalyst kept a 3D flower-like structure with the average size of 2 μm and had larger specific surface area as well. The degradation efficiency of Rh B had reached 96.2% in 120 min and the catalyst exhibited some loss of activity after 4 cycles, but still had the best photocatalytic performance.
• Select
  Simulation analysis on thermal conductivity of buckypaper/polymer composites

  ZHANG Aying, LV Haibao

  Journal of Functional Materials. 2017, 48(5): 5094-5098. https://doi.org/10.3969/j.issn.1001-9731.2017.05.017

  Abstract ( ) Download PDF ( ) Knowledge map Save

  In order to study the effect of buckypaper heating sheet with shape control, thickness and bending cycles on the temperature distribution of the buckypaper/polymer composites when reaching the steady state, FLUENT is used to analyze the thermal conductivity of the polymer-based composites reinforced by flat and bending nanopaper under different working conditions. The calculation results show that the average temperature of the nanocomposite with pulse bending nanopaper is lower, the heating rate is slower and the time to reach the steady state is shorter in the heating process. The smaller the thickness of nanopaper heating sheets is, the smaller the bending cycle is. The higher the average temperature is, the time of the polymer-based composites reinforced by nanopaper reaching the steady state is longer. It is concluded that the required time for the thickness and bending cycles of nanopaper heating sheets to enhance the polymer-based composites to reach the steady state and the effect of temperature distribution is mainly done through the unit volume heat of nanopaper heating sheets. Because the heat dissipation rate is lower than the increase rate of heat production, it takes longer time for the polymer-based composites reinforced by nanopaper to reach the steady state.
• Select
  Enhanced gas sensing performance of pollen template synthesized Ag/ZnO nanoparticles

  LI Yan, CHEN Lili, LV Tan

  Journal of Functional Materials. 2017, 48(5): 5099-5103. https://doi.org/10.3969/j.issn.1001-9731.2017.05.018

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Rape pollen template synthesized Ag/ZnO nanoparticles were characterized by X-ray diffraction, scanning electron microscopy and gas-sensing test. The results showed that the Ag/ZnO nanoparticles with diameter of 30-50 nm mainly involves a hexagonal wurtzite structure and a little silver metal phase. The gas-sensing measurements revealed that the Ag(2%) /ZnO sensor has an enhanced response (38.2) to 100×10^-6 acetone gas at a relatively low working temperature (270 ℃), which is about 10 times than that of the pure ZnO. The response and recovery time of the sensor are 3 and 36 s, respectively.
• Select
  Preparation and photocatalytic performance of coal cinder-supported titanium dioxide composites

  QIU Zehai, HUANG Tianfu, ZHAO Chenhao, ZHENG Ruijuan, WU Dewu, DING Matai, HU Zhibiao

  Journal of Functional Materials. 2017, 48(5): 5104-5108. https://doi.org/10.3969/j.issn.1001-9731.2017.05.019

  Abstract ( ) Download PDF ( ) Knowledge map Save

  This thesis focused on the preparation and application of the cinder-supported nanometer TiO₂ photocatalyst by sol-gel technique under the microwave-assisted conditions. The cinder-supported catalysts characterized by XRD and SEM were consisted of anatase titan TiO₂ with an average size of 12 nm. By taking methylene blue as the degradation targets, the effect of cinder content, sintering temperature, microwave time and microwave power on the photocatalytic performance of coal cinder-supported titanium dioxide composites was investigated. The results showed that when the percentage content of cinders, microwave-time, microwave-power, muffle furnace temperature were 32.49%, 5 min, 400 W, 400 ℃, respectively, the coal cinder-supported titanium dioxide composites showed the best effect of degradation on methylene blue. In addition, the dynamic response obeyed pseudo-first-order kinetics equation.
• Select
  Si-Co alloy as anode materials for lithium ion batteries: a first-principles study

  HUANG Zhaowen, XIAO Wenping, LI Jingyang, HOU Xianhua

  Journal of Functional Materials. 2017, 48(5): 5109-5115. https://doi.org/10.3969/j.issn.1001-9731.2017.05.020

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Synthesizing Si-M active-active/inactive systems is considered as useful way to decrease the volume expansion ratio of Si-based anode materials. In this paper, based on first-principle plane wave method, Si-Co alloy interphases were studied as anode materials for lithium ion batteries. The results showed that, among the Si-Co phases Si₂Co exhibited the lowest volume expansion ratio and the lowest lithium intercalation formation energy. And the average charge population per unit bond length of the Li₂Si₂Co was the lowest one among the Si-Co phases. The phase Si₂Co showed the best electrochemical performance.
• Select
  Thermal property comparison of two zinc alkylphosphinate flame-retardant epoxy resin

  HU Quan, PENG Panrui, ZHOU Min, HU Jilong, LIU Xueqing, LIU Jiyan

  Journal of Functional Materials. 2017, 48(5): 5116-5121. https://doi.org/10.3969/j.issn.1001-9731.2017.05.021

  Abstract ( ) Download PDF ( ) Knowledge map Save

  In this study, thermal stability and decomposition kinetics of Zn(MHP) and Zn(MEP) as well as epoxy(EP) flame retardants system were investigated by thermogravimetric analysis. The average activation energy (E_a) and pre-exponential factor A of decomposition were calculated with Flynn-Wall-Ozawa (FWO) and Kissinger method. Coats-Redfern method was used to discuss the probable degradation mechanism by selection of different mechanical models. The results show that the E_a value obtained from Kissinger method is in good agreement with the value from FWO method. Zn(MHP) shows higher thermal stability and has higher E_a value than Zn(MEP). Adding Zn(MHP) or Zn(MEP) into EP can improve the thermal stability and delay the E_a of EP, the char residue and the decomposition of EP. When the filler loading is kept at 20wt%, EP/Zn(MHP) has higher E_a than EP/Zn(MHP). The solid state decomposition mechanism with Coats-Redfern method for Zn(MHP) is in accordance with the function of g(a)=－ln(1－α) with n=1. The decomposition mechanism of Zn(MEP) corresponds to the function of g(a)=3[1－(1－α)^1/3]with n=1/3. EP/Zn(MHP) and EP/Zn(MHP) have the same thermal decomposition mechanism, which proposes to the function of g(a)=[－ln(1－α)]^2/3 with n=2/3.
• Select
  Effects of Sn-doping on thermoelectric properties of Ca₂Si-based semiconductor

  DUAN Xingkai, JIANG Yuezhen, HU Konggang, KUANG Jing, YI Dengliang, JIN Haixia

  Journal of Functional Materials. 2017, 48(5): 5122-5126. https://doi.org/10.3969/j.issn.1001-9731.2017.05.022

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Ca₂Si_(1-x)Sn_x (x=0, 0.02, 0.04, 0.06) thermoelectric materials were fabricated by melting in tantalum tube and hot pressing technique. Phase structures of the samples were analyzed by means of x-ray diffraction (XRD). The results show that the characteristic peaks of the bulk Ca₂Si_(1-x)Sn_x can be indexed into Ca₂Si. The peak of Ca₅Si₃ exists in the XRD patterns of all the bulk Ca₂Si_(1-x)Sn_x samples. The peak of CaSn₃ can be found in the XRD patterns of the bulk Ca₂Si_(1-x)Sn_x(x=0.06) sample. Hall coefficients of the samples were measured at room temperature. The electrical conductivity and Seebeck coefficient of Ca₂Si_(1-x)Sn_x alloys were studied in the temperature range of 300-873 K. The electrical conductivity of the Sn-doped samples increases with increasing Sn concentration, while the Seebeck coefficient of the Sn-doped samples decreases. The lattice thermal conductivity and total thermal conductivity of the Ca₂Si_(1-x)Sn_x samples were investigated in the temperature range of 300-873 K. Compared with the Ca₂Si sample, Sn-doping (x=0.02, 0.04) results in the decrease of the lattice thermal conductivity, especially Ca₂Si_(1-x)Sn_x with x=0.02. The Ca₂Si_(1-x)Sn_x with x=0.02 sample exhibits the lowest thermal conductivity within the whole testing temperature range. The ZT values of Ca₂Si_(1-x)Sn_x with x=0.02 sample have an enhancement in the temperature range of 550-873 K by contrast with those of the Ca₂Si sample. The maximum ZT value was 0.22 at 873 k, which was observed for the Ca₂Si_(1-x)Sn_x with x=0.02 sample.
• Select
  Optical H₂ sensing properties of oriented ZnO:Cd nanorod thin films

  CHEN Lu, YANG Xiaohong, ZHANG Li

  Journal of Functional Materials. 2017, 48(5): 5127-5131. https://doi.org/10.3969/j.issn.1001-9731.2017.05.023

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Oriented ZnO:Cd nanorods thin films of about 1000nm thickness have been synthesized by sputtering and hydrothermal method on the transparent glass substrates. Their morphologies and crystal structures are characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The SEM results show that those films are composed of nanorods arrays and the XRD patterns of the samples indicate that those nanorods are the hexagonal phase of wurtzite with c-axis orientation. The sensors are fabricated by adhering a film to a transparent glass substrate to form a small cell. The optical transmittances of the sensors are measured before and after they are exposed to Hydrogen gas by spectrophotometer. The sensors show fast optical response to 500×10^-6 H₂ at room temperature with good repeatability.
• Select
  Synergistic effect of graphene oxide /silica in enhancing the mechanical properties of silicone rubber

  YANG Bo, WEI Shilin, SUN Suming, ZHANG Qian, YU Fengmei, LU Ai, KANG Ming

  Journal of Functional Materials. 2017, 48(5): 5132-5136. https://doi.org/10.3969/j.issn.1001-9731.2017.05.024

  Abstract ( ) Download PDF ( ) Knowledge map Save

  SiO₂-Graphene oxide (GO)/silicone (MVQ) composites were prepared by mechanical mix method and the influence of GO on the vulcanization process, steady state, dynamic mechanical properties and relaxation of composites have been studied. The results showed that GO can improve the physical reinforcing effect of filler network, but weaken the chemical reinforcement effect by delaying the vulcanization crosslinking speed of silicone rubber and reducing crosslinking density. SiO₂-GO(40:2)/MVQ composites exhibited the best reinforcing effect, and compared with SiO₂/MVQ, the modulus at 100% strain, the tensile strength, the elongation at break and the dynamic modulus increased by 37%, 17%, 8% and 115%, respectively. After the introduction of GO, Payne effect and relaxation effect of composites became more obvious, which reflects that filler network, having better physical reinforcing effect, was formed by GO along with SiO₂.
• Select
  Design and verification of a radar-infrared stealth-compatible material based on metamaterial

  LI Junzhe, TIAN Hao, LIU Haitao, CHENG Haifeng, HOU Zhongxi

  Journal of Functional Materials. 2017, 48(5): 5137-5143. https://doi.org/10.3969/j.issn.1001-9731.2017.05.025

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Based on the new material design concept of metamaterial, the fabrication of radar-infrared stealth-compatible materials through the metamaterial technique was proposed. A kind of radar-infrared stealth-compatible material based on two-double metamaterial structure has been designed. The wave absorbing principle of the radar-infrared stealth-compatible material was studied by equivalent circuit method. In order to confirm the design results, the radar-infrared stealth-compatible material was prepared, and the reflectivity of the absorber was measured, showing that the experimental result was consistent with the design value. When thickness of prepared radar-infrared stealth-compatible material is less than 0.3 mm, the reflectivity bandwidth of 4-8 GHz below -6 dB is obtained and the IR emissivity is 0.298.
• Select
  Research on the corrosion resistance of graphene oxide on cement mortar

  YANG Yaling, YUAN Xiaoya, SHEN Xu, YIN Lu

  Journal of Functional Materials. 2017, 48(5): 5144-5148. https://doi.org/10.3969/j.issn.1001-9731.2017.05.026

  Abstract ( ) Download PDF ( ) Knowledge map Save

  GO were prepared by Hummers method and ultrasonic dispersion, and the structure of GO was characterized by SEM and FT-IR. The effect on the corrosion resistance of GO with different dosage soaked in complex salt solution respectively for a long period and the wet and dry cycle function on the cement mortar were investigated. The results indicate that the flexural strength, compressive strength and corrosion resistance of cement-based materials reached the maximum after corrosion when the dosage of GO was 0.03%. SEM results show that the internal structure of the reference specimens was partial incompact and rambling and there were obvious corrosion signs inside the cement structure. However, when the dosage of GO was 0.03%, the internal structure of specimens was compact and there weren’t corrosion signs inside the cement structure. The spectrum analysis show that there were many elements such as Na, S, Cl and so on in the reference specimens, but not in the specimens with the dosage of 0.03% GO. The results indicated that it can play a positive role for improving corrosion resistance when the dosage of GO were 0.03% on cement-based materials.
• Select
  Controlled synthesis of biodegradable and thermosensitive cyclic block copolymer

  YANG Dandan, NIE Kangming, ZHANG Yanhao, WANG Song

  Journal of Functional Materials. 2017, 48(5): 5149-5153. https://doi.org/10.3969/j.issn.1001-9731.2017.05.027

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The biodegradable and thermosensitive cyclic-poly (ε-caprolactone)-b-poly (N- isopropylacrylamide) (cyclic-PCL-b-PNIPAM) was synthesized by atom transfer radical polymerization (ATRP) and “click” chemistry. The structure, molecular weight and its distribution of the copolymer were characterized by FT-IR, ¹H-NMR and GPC, respectively. The thermodynamic properties, thermosensitivity and hydrophilicity of the copolymer were studied by TGA, DSC and the contact angle measurement, respectively. The results showed that compared with linear-PCL-b-PNIPAM, because the formation of ring topology with no end group, the thermal stability of the cyclic copolymers is obviously improved. The phase transition temperature of cyclic-PCL-b-PNIPAM is 37.5℃, showing that thermosensitive PNIPAM was systhesized successfully. In additon, the hydrophilicity of the cyclic copolymers is also changed.
• Select
  Study on preparation and properties of myristic-stearic acid/ modified fly ash composite phase change energy storage materials

  HUANG Ping, DING Yimin, HU Ting, ZHANG Jin, WANG Xue

  Journal of Functional Materials. 2017, 48(5): 5154-5158. https://doi.org/10.3969/j.issn.1001-9731.2017.05.028

  Abstract ( ) Download PDF ( ) Knowledge map Save

  A new type of composite phase change energy storage material was prepared by melt-blending method, using myristic acid (MA)-stearic acid (SA) binary eutectic mixture as the substrate of phase change heat storage materialsand modified fly ash as complex substrates. The structure and heat performance of the composites were respectively characterized by FT-IR and TG/DTA. The results showed that MA-SA can be uniformly embedded into porous structure of modified fly ash. After 800 cycles of absorption and rejection heat, the phase change temperatures and enthalpy of the composites had little change. Furthermore, the composites had good heat storage stability, showing good practical application in energy storage.
• Select
  Mechanism for the reversible wettability changes of ZnO nanorod array films under low-power UV irradiation

  LI Hui, ZHANG Jun

  Journal of Functional Materials. 2017, 48(5): 5159-5163. https://doi.org/10.3969/j.issn.1001-9731.2017.05.029

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Superhydrophobic ZnO nanorod array films have been prepared via a hydrothermal route and stearic acid modification. Upon low-power UV irradiation, the surface wettability has gradually changed from superhydrophobicity to superhydrophilicity. This transition can be reversed upon prolonged dark storage. FT-IR analyses show that the hydrophobic stearic acid on the nanorods has not obviously degraded by photoirradiation. This indicates that UV-induced superhydrophilicity do not relate to the hydrocarbon removed by photocatalysis. Furthermore, oxygen vacancies play crucial roles in causing the reversible conversion of the surface wettability, which has been confirmed by XPS analysis. This work provides a new idea for studying the mechanism of UV-induced wettability conversion.
Process & Technology
• Select
  Study on flame retardant properties of inorganic particleboard with a uniform mixture of wheat straw and wood

  PAN Yage, ZHU Lingbo, TANG Qian, HUANG Qinghua, LU Li, ZHENG Xia, LI Xingong

  Journal of Functional Materials. 2017, 48(5): 5164-5168. https://doi.org/10.3969/j.issn.1001-9731.2017.05.030

  Abstract ( ) Download PDF ( ) Knowledge map Save

  With Mg-based inorganic adhesive and uniform mixed particles of wheat straw and wood as materials, inorganic particleboard with a uniform mixture of wheat straw and wood was prepared by hot-pressing technology. Cone calorimeter and thermal conductivity measure instrument were used for the comparative study of flame retardancy and smoke suppression of ordinary wheat straw particleboard, wheat straw inorganic particleboard, wood inorganic particleboard and inorganic particleboard with a uniform mixture of wheat straw and wood. The results show that compared with ordinary wheat straw particleboard, inorganic adhesive can significantly reduce the release of heat and smoke. Heat release rate(HRR), total heat release(THR), smoke production rate(SPR), total smoke production(TSP)and mass loss of inorganic particleboard with a uniform mixture of wheat straw and wood are higher than wheat straw inorganic particleboard but lower than wood inorganic particleboard and time to ignition(TTI)of that is shorter than wheat straw inorganic particleboard but longer than wood inorganic particleboard, indicating that inorganic particleboard with a uniform mixture of wheat straw and wood has a good effect on flame retardancy and smoke suppression.
• Select
  Experimental study on the preparation of three dimension polylactic acid tissue engineering porous scaffold based on supercritical fluid

  JIANG Jingzhi, MIAO Kai, CUI Haiting, PENG Peiying

  Journal of Functional Materials. 2017, 48(5): 5169-5173. https://doi.org/10.3969/j.issn.1001-9731.2017.05.031

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Structuring of ideal three dimension (3D) porous scaffold is the prerequisite for the study success of tissue-engineered artificial organs. Tissue engineering scaffolds with 3D external stereoscopic structure and 3D internal interflow were prepared by supercritical fluid induced phase separation process with polylactic acid as model material and dichloromethane as solvent. The feasibility of this process was investigated. The influences of operation parameters such as operating pressure, operating temperature and solution concentration on the pore morphology, structure and the wall were analyzed. The results showed that the tissue engineering 3D porous scaffold with uniform pore diameters, good intercommunication and high porosity can be prepared successfully by supercritical fluid induced phase separation process characterized by short operating time and simple process. With the increase of operating pressure, operating temperature and solution concentration, the pore diameters decreases gradually. However, lower operating temperature, higher operating pressure and solution concentration results in a rapid precipitation of polylactic acid in the polymer rich phase which leads to specific pore walls composed of nano or micro-meters polylactic acid particles. In this experimental range, the optimal operating parameters is of operating pressure 10 MPa, the operating temperature 45 ℃ and solution concentration 20wt%.
• Select
  Experimental observation on the thermo-mechanically cyclic deformation behavior of shape memory polyurethane

  ZHANG Zebin, LI Jian, CHEN Kaijuan, QIU Bo, KANG Guozheng, KAN Qianhua

  Journal of Functional Materials. 2017, 48(5): 5174-5179. https://doi.org/10.3969/j.issn.1001-9731.2017.05.032

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Shape memory polyurethane is a kind of thermotropic functional polymer materials, which can be stimulated by the external temperature and recover to initial state by changing its molecular structures. Firstly, monotonic tensile experiments were carried out to obtain the mechanical properties of glass and rubber states at different temperatures. Moreover, the thermo-mechanically cyclic experiments under different peak strains show that the increased stress amplitude decreases with the increased peak strain during the cooling process. The recovery rate increases but the recovery ratio decreases with the increased number of cycles, which implies a functional degradation of shape memory. Finally, it was found that the interaction between mechanical and thermo-mechanical cycles can increase the rate and ratio of recovery, resulting in the stability improvement of shape memory polyurethane.
• Select
  Study on the Al doped Cu₃N films prepared by magnetron sputtering

  YUAN Zuobin, ZUO Anyou, LI Xingao

  Journal of Functional Materials. 2017, 48(5): 5180-5184. https://doi.org/10.3969/j.issn.1001-9731.2017.05.033

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Al doped Cu₃N films were prepared on glass substrate by reactive magnetron co sputtering, and the structure, morphology, optical and electronic properties of Al doped Cu₃N films were studied. According to XRD results, the site of peaks have not been changed obviously, which indicates that Al could substitute for Cu or turn into the grains boundary. With the increase of Al doped concentration, the crystallization of Cu₃N films gradually decreases. SEM shows that the shape of crystal grains has been varied to irregular after doping with Al, and the grain boundary of films has been confused, which can be demonstrated that Al restrained the growth of Cu₃N crystals. The optical energy gap of Cu₃N films are becoming smaller with the increase of Al doping content, which make clear adjustable optical energy gap. The decreasing gap may be attributed to the localized states of Al into band gap of Cu₃N. Simultaneously, the resistivity grows to smaller after doping with Al.
• Select
  Fluorescence characteristics and labeling mechanism for living cells of pathogenic fusarium with silicon carbide quantum dots

  LIU Hongjie, SUN Fengfei , SONG Yuepeng , ZHU Yanmin , KANG Jie , KIM Hyoung-seop

  Journal of Functional Materials. 2017, 48(5): 5185-5189. https://doi.org/10.3969/j.issn.1001-9731.2017.05.034

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Fluorescence characteristics of silicon carbide quantum dots(SiC-QDs) prepared by chemical corrosion method and labeling mechanism for the living cells of pathogenic fusarium were explored. The results indicate that SiC-QDs photoluminescence intensity reach the maximum value when excitation wavelength is 340nm. Red shift phenomenon of emission wavelength will occur with the excitation wavelength increasing. Because of larger Stokes shift and tunable color fluorescent, near ultraviolet detection for living cells with SiC-QDs fluorescent marking was achieved, which can effectively detect and quantitatively analyze the autofluorescence cells. The results of labeling mechanism for living cells of pathogenic fusarium with SiC-QDs exhibit that quantum dots can reach the cells interior through the clathrin endocytosis action, and achieve homogeneous distribution. So the living cells were marked with stably fluorescent labeling. Moreover, marking model for living cells with SiC-QDs was established based on the experimental results and theoretical analysis.
• Select
  Manufacture of superalloy wire for nuclear power engineering

  WANG Mingbo, HE Wenhai, LIU Haiding, WANG Dongzhe, CHANG Liang, Mo Yan, ZHU Tianqi

  Journal of Functional Materials. 2017, 48(5): 5190-5192. https://doi.org/10.3969/j.issn.1001-9731.2017.05.035

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Effect of cold-drawing deformation, solution treatment and ageing treatment on the grain size and mechanical properties of GH4169 wire for nuclear power engineering was studied. It was shown that with a rise in solution treatment temperature, the alloy grain size increased but its hardness decreased. Due to the effect of strain hardening, higher amount of cold deformation resulted in superior room temperature strength, and when the cold drawing deformation is greater than 25%, the contribution of work hardening on tensile strength significantly increased.
• Select
  Research of different heat treatment on microstructure and property of V150 drill pipe material

  LIU Ge, CHEN Linyan, SONG Yongshi, LI Zhenyu, HE Renqi

  Journal of Functional Materials. 2017, 48(5): 5193-5198. https://doi.org/10.3969/j.issn.1001-9731.2017.05.036

  Abstract ( ) Download PDF ( ) Knowledge map Save

  As acid oil-gas fields appear in succession, the research of corrosion performance of drill pipe in acidic environment is particularly important. Corrosion properties of V150 drill pipe material after different heat treatment were investigated by means of microscope, universal testing machine, impact tester, scanning electron microscope and energy spectrometer and so on. The results showed that heat treatment can improve the resistance to hydrogen sulfide stress corrosion (SSC) and hydrogen induced cracking (HIC) performance of V150 drill pipe materials. The mechanical properties and corrosion resistance of V150 drill pipe materials were not affected by secondary tempering. Inclusions and defects are the main causes which reduce resistance to SSC. The main corrosion products were Fe-sulfide and Mn-sulfide after hydrogen induced cracking test. In addition, Cu, Ni can improve resistance to HIC.
• Select
  Green controlled synthesis of gold nanoparticles and its reaction mechanism

  SUN Li, YIN Yuechao, ZHANG Lixin, SU Wenxian, WEI Zhong

  Journal of Functional Materials. 2017, 48(5): 5199-5204. https://doi.org/10.3969/j.issn.1001-9731.2017.05.037

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The monodisperse Au nanoparticles (NPs) were rapidly synthesized with the soluble starch and chloroauric acid as the reduce agent and the precursor of Au element, respectively. Au NPs were characterized using the ultraviolet-visible spectrophotometer (UV-Vis), transmission electron microscope (TEM), X-ray diffraction (XRD) and energy dispersive X-Ray spectroscopy (EDX). It was found that spherical Au NPs with face-centered cubic phase and the average diameter size less than 40nm were synthesized and their surface plasma resonance (SPR) peak was lineally controlled in the range from 534 to 552 nm. Effects of the hydrolysis time, the adding quantity of chloroauric acid and the reaction time on optical properties of Au NPs were investigated. The optimal hydrolysis time was 5 min. The SPR peak of Au NPs was regularly red-shifted with the increase of the reaction time and the adding quantity of chloroauric acid.
• Select
  Synthesis andproperties of comb-like polycarboxylates AMPS/MAA/MAAMPEG

  ZHU Junfeng, WANG Pei, ZHANG Guanghua, LI Junguo

  Journal of Functional Materials. 2017, 48(5): 5205-5210. https://doi.org/10.3969/j.issn.1001-9731.2017.05.038

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The methoxy polyethylene glycol methacrylate ester monomer (MAAMPEG) was prepared by methoxy polyethylene glycol (MPEG, ethylene oxide units of 11, 23) and methacrylic acid (MAA) as raw materials. Comb-like polycarboxylate (PC) dispersants AMPS / MAA /MAAMPEG (AMAPEG) bearing side chains of different lengths were prepared using the esterification monomer, methacrylic acid,and 2-acrylamido-2-methyl propane sulfonic acid (AMPS). The structure, molecular weight and distribution of the polycarboxylate were characterized by infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy (¹H-NMR), gel permeation chromatography (GPC). The PCs and naphthalene sulfonate (NSF) were applied to make Binchang coal-water slurry (CWS). The results show that the M_w of the PC is 2×10⁴~3×10⁴ and the dispersion coefficient D is about 1.3. When the optimum dosage of dispersant is 0.4%, the highest concentration of CWS can reach 65%, the viscosity slurry is about 447 mPa·s and zeta potential is -56 mV. The PC shows better wetting property and better dispersion viscosity as well as stability than the NSF dispersant.
• Select
  Preparation and properties of Al₂O₃ modify 3D-SiC/Al composite materials

  ZHANG Dachuan, WANG Dongmei, ZHENG Zhixiang, WU Yucheng

  Journal of Functional Materials. 2017, 48(5): 5211-5215. https://doi.org/10.3969/j.issn.1001-9731.2017.05.039

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Using Al₂O₃ as modifier to reactively sinter SiC preforms and form mullite interface between SiC particles, a 3D-SiC/Al interpenetrated composite was fabricated by pressureless infiltration technique. The influence of Al₂O₃ content, preform sintering time, infiltration temperature and infiltration time on the bending strength and thermal conductivity of 3D-SiC/Al composite were investigated through orthogonal experiment. The results showed that Al₂O₃ content had a significant effect to the bending strength and thermal conductivity, the optimal bending strength of 344Mpa and thermal conductivity of 165 W/(m·K) were obtained under the conditions of 2.0at% Al₂O₃ content, 2 h preform sintering time, 950 ℃ infiltration temperature and 1 h infiltration time.
• Select
  Synthesis and properties of photochromic waterborne polyurethane finishing agent system

  CHAI Chunpeng, XU Dandan, MA Yifei, LI Shuaijie, LI Guoping, LUO Yunjun

  Journal of Functional Materials. 2017, 48(5): 5216-5220. https://doi.org/10.3969/j.issn.1001-9731.2017.05.040

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The commercial photochromic materials (MC) and waterborne polyurethane were finished on a type of photochromic and environment-friendly waterborne polyurethane (WPU) finishing agent by traditional synthetic process. The finishing agents were characterized by laser particle size measuring instrument, scanning electron microscope (SEM), color difference machine and contact angle apparatus. The results showed that the color-change effect of photochromic waterborne polyurethane (MC-WPU) finishing agent is remarkable. After coating finishing, the fabric surface is uniform and smooth with breathable tiny pores, and similar to the rough surface of lotus leaves. The total color difference and contact angle were increasing gradually and reached a maximum value at 1.6 percent with the increasing content of MC powder. The test results showed that MC-WPU has good photosensitive and hydrophobic properties.