30 May 2016, Volume 47 Issue 5
    

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    Focuses & Concerns
  • Drag reduction mechanism of feather-like riblet film
    FENG Beibei, WANG Jiadao, CHEN Darong, LIU Zhiyong, JIANG Shengyao
    功能材料. 2016, 47(5): 1-4. https://doi.org/10.3969/j.issn.1001-9731.2016.05.001
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Based on the riblet geometry of bird flight feather or tail feather, a kind of film with rule micron-scale riblets was manufactured using hot wheel pressing technique and significant drag reduction was obtained through wind tunnel tests. In this paper, effect of smooth surface and riblet surface on skin friction was studied through establishing numerical model and revealed that the microvertex induced inside the riblets was the main factor resulting in the drag reduction effect of bionic film which changed along with the wall shear stress and pressure distribution. Results indicated: it was a contradiction relationship between the reduced viscous friction and the increased pressure drag affecting the skin friction reduction of bionic film. But, we achieved the minimum pressure drag and maximum drag reduction through the optimized riblet geometry.
  • Low-temperature solvothermal synthesis of morphology controlled EuS hollow microspheres
    PENG Yong, LI Peng, WANG Hong, LUO Xixian, FU Yao, XING Mingming
    功能材料. 2016, 47(5): 5-10. https://doi.org/10.3969/j.issn.1001-9731.2016.05.002
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    EuS crystals are synthesized by low-temperature solvothermal decomposition of the single source precursor complex (Phen)Eu(Et2CNS2)3 in acetonitrile. Scanning electron microscopy, Fourier transform infrared spectroscopy, and UV-Visible absorption spectroscopy are used to characterize the structure and properties of the obtained EuS crystals. The results show that the formed EuS crystals are uniform hollow microspheres. Organic matters adsorbed surface of EuS hollow microspheres are identified. We explores the effect of different thermal conditions on EuS product, and finally we find out that the crystalline quality of the product is getting better, and the particle size is getting smaller durch the rising of the temperature, and the increasing of the pressure. By changing thermal conditions on EuS product, difference morphology EuS hollow microspheres can be synthesized.
  • PAMAM dendritic macromolecules in the application of waterborne polyurethane synthetic study
    WANG Xuechuan,ZHANG Zhe,GUO Zidong,WANG Na,QIANG Taotao
    功能材料. 2016, 47(5): 11-17. https://doi.org/10.3969/j.issn.1001-9731.2016.05.003
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    The polyurethane prepolymer was prepared by the isophorone diisocyanate (IPDI), polyether polyol (DL-2000D), polyester polyol (CMA-244), 2,2-Dimethylol propionic acid (DMPA), 1,4-Butylene glycol and ethylene glycol. The polyurethane prepolymer was grafted on whole generation of polyamide-amine (PAMAM), and then a new series of dendritic waterborne polyurethane was synthesized. The products were characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscope (TEM), laser particle size analysis. Then the apparent performances were analyzed by using atomic force microscope (AFM) and water contact angle. At last, the physical and chemical properties of the film were studied. The results show that the high elasticity characteristics of PAMAM can effectively improve the physical and chemical performance of waterborne polyurethane. Comprehensive compare different algebraic PAMAM and the physical properties of the modified waterborne polyurethane, the relative molecular mass of smaller PAMAM (G2) modification of water-based polyurethane WPU-G2 can obviously improve the aqueous polyurethane water resistant and heat resistant performance.
  • Preparation and characterization of ordered porous carbon membrane materials by SBA-15 template method
    ZHANG Bing, ZHOU Jialing, WANG Dan, WU Yonghong, LI Lin, WANG Tonghua
    功能材料. 2016, 47(5): 18-21. https://doi.org/10.3969/j.issn.1001-9731.2016.05.004
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    Ordered porous carbon membrane materials (OPCM) were prepared by using mesoporous molecule sieves SBA-15 as template and polyimide as precursor via a combined process involving the blending, membrane-forming, pyrolysis and template removal steps. The thermal stability of precursor, functional groups on membrane surface, structural morphology and microstructure were respectively characterized by the techniques of thermogravimetric analysis, infrared spectroscopy, electron microscopy and X-ray diffraction. The microstructure and morphology of membranes before and after SBA-15 removal, as well as the gas separation performance of OPCM, were investigated. Results have shown that the gas separation factors significantly exceed the Knudsen diffusion, when the OPCM was fabricated under the condition of pyrolysis temperature of 650 ℃ and the content of SBA-15 of 1%.
  • Researchon chemical structures and properties of pre-ceramic polymer polyborosilazanes with different boron contents
    TENG Yadi,HUANG Xinlong
    功能材料. 2016, 47(5): 22-29. https://doi.org/10.3969/j.issn.1001-9731.2016.05.005
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    A series of polyborosilazanes(PBSZ) were prepared from dichloromethylvinylsilane by hydroboration, ammonolysis polycondensation and thermopolymerization. The polyborosilazanes have weight-average molecular weights (MW) of 9.0×104-2.6×105. The real boron contents of the polyborosilazanes are 2.59%-9.92%(ω) determinated by modified curcumin spectrophotometric method. The structures of the polyborosilazanes were characterized by FT-IR and 1H NMR. The high boron contents polyborosilazanes have linear structures and low boron contents polyborosilazanes have star structures. PBSZ with linear structures are soluble in common organic solvents such as THF, toluene, ethyl acetate, trichloromethane, absolute alcohol and so on whereas star PBSZ are insoluble. The thermal properties of the polyborosilazanes and self-made polysilazanes were contrastive tested by TGA. The results showed that the mass loss of the polyborosilazanes at 1 350-1 500 ℃ were 0%-0.09% whereas the mass loss of the polysilazanes were 0.73%. It revealed that quaternary system Si-B-C-N ceramics derived from the polyborosilazanes had better high-temperature stability than ternary system Si-C-N ceramics.
    • Review & Advance
  • Research progress on thermal conductivity of magnesium alloys
    YOU Guoqiang, BAI Shilei, MING Yue, MA Xiaoli
    功能材料. 2016, 47(5): 30-35. https://doi.org/10.3969/j.issn.1001-9731.2016.05.006
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    The recent research progress of thermal conductivity of magnesium alloy was reviewed. The effects of temperature, alloying elements, extrusion and heat treatment on thermal conductivity of magnesium alloy were analyzed respectively. The chief conclusions are as follows: (1) Thermal conductivity of magnesium alloy is based on the movement of electron and phonon. The processing factors influence the thermal conductivity by changing the microstructure of alloy that has direct effects on the movement of electron and phonon; (2) Thermal conductivity of most magnesium alloys increase with increasing temperature, while that of some magnesium alloys increase firstly, followed by decreasing and increasing again near the temperature of absolute zero; (3) Except for some alloying elements, the addition of most alloying elements has a negative effect on thermal conductivity of magnesium alloy; (4) Extrusion decrease thermal conductivity of magnesium alloy and lead to anisotropy of thermal conductivity; (5) Thermal conductivity of magnesium alloy decrease after solution treatment and slightly increase after subsequent aging treatment.
  • Compressive strength and its test methods of carbon fibers
    OUYANG Ting, FEI Youqing
    功能材料. 2016, 47(5): 36-42. https://doi.org/10.3969/j.issn.1001-9731.2016.05.007
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    Inferior axial compressive strength in comparison with tensile strength of carbon fibers has always been a prompt in research of improving its compressive properties. However, comparing with well developed techniques for measuring tensile properties of carbon fibers and composites, accurate measurement of compressive properties has not been without problem. Different test methods for determing the compressive strength of single carbon fibers have been reviewed here. The testing results were compared and anaylzed to indicate their applicability. Possible compressive failure mechanisms in relate to microstructure of carbon fibers were discussed.
  • Advance in cellulose nanofiber for functional materials
    QING Yan, WU Yiqiang, LUO Sha, CAI Zhiyong, WU Qinglin, TIAN Cuihua
    功能材料. 2016, 47(5): 43-49. https://doi.org/10.3969/j.issn.1001-9731.2016.05.008
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    Cellulose nanofiber is originally prepared from natural cellulosic resources such as wood, bamboo, agricultural residuals, and several marine animals. As a promising candidate for functional materials, cellulose nanofiber behaves numerous merits including excellent mechanical properties, well optical transmission, natural interconnected network, and abundant chemical groups on fiber surface. In this work, the present status of cellulose nanofiber for the preparation of green energy storages (Li-ion battery and supercapacitors), flexible nano-devices, controlled optical transmission materials, functional templates, novel plant-based carbon nanofiber, medicine carrier and tissue cultivation was summarized.
  • Research progress of high-entropy alloys with multi-principal elements and its prospective application
    SUI Yanwei, CHEN Xiao, QI Jiqiu, HE Yezeng, SUN Zhi
    功能材料. 2016, 47(5): 50-54. https://doi.org/10.3969/j.issn.1001-9731.2016.05.009
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    Research progress and some achievements of high-entropy alloys with multi-principal elements today are summarized.Firstly,the broad design principles,four effects and several preparation methods of this new kind alloy are covered.Then major research areas of high-entropy alloys are introduced. Besides,the problems existed in application process and relevant achievements are described in detail.At last,according to the characteristics of high-entropy alloys,probable applications fields are presented.
  • Research and application of colloidal crystal self-assembly by polystyrene microspheres
    WU Duoduo,MA Jianzhong,BAO Yan,ZHANG Yonghui
    功能材料. 2016, 47(5): 55-62. https://doi.org/10.3969/j.issn.1001-9731.2016.05.010
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    Colloidal crystal has been attracted with considerable interest as a new material, and a common method to prepare colloidal crystal is self-assembly of colloidal particles. Polystyrene (PS) microspheres are common colloidal particles, this paper reviews common methods for self-assembly of PS microspheres to prepare colloidal crystal, including vertical deposition, gravitational deposition, interfacial self-assembling, spinning coating and physical limitation, etc. Also, progress of preparation of nanostructure materials with PS colloidal crystal as template or mask is summarized.
    • Research & Development
  • The adsorption properties of chloromethane on a metal organic framework MIL-53
    WANG Mingyang, TIAN Fengming, Zhou Lin, Zhang Xinghua, CHEN Yunlin
    功能材料. 2016, 47(5): 63-67. https://doi.org/10.3969/j.issn.1001-9731.2016.05.011
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    MIL-53(Al, Fe, Cr) were synthesized by hydrothermal method. Resulting samples were characterized by X-ray diffraction (XRD) and N2 adsorption-desorption. The adsorption behavior of dichloromethane (CH2Cl2) and chloroform (CHCl3) on MIL-53(Al, Fe, Cr) was studied at 298 K, 101 kPa using a fixed bed continuous flow reactor and a gas chromatography. The experimental results indicated that MIL-53(Al,Fe,Cr) have better adsorption capacity for CH2Cl2 than CHCl3, the adsorption capacity for chloromethane was in the order MIL-53(Al)>MIL-53(Cr)>MIL-53(Fe), and the maximum adsorption amount for CH2Cl2 and CHCl3 on MIL-53(Al) were 16.88 mmol/g and 7.11 mmol/g, respectively. In addition, the results of adsorption experiments were supported by the Grand canonical Monte Carlo (GCMC) simulation.
  • Experimentalon parameters of temperature-humidity of gypsum-based composite phase change material
    SHANG Jianli,ZHANG Hao,XIONG Lei,MA Xianglong
    功能材料. 2016, 47(5): 68-72. https://doi.org/10.3969/j.issn.1001-9731.2016.05.012
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    In order to further supplement and improve the reliability of coupled heat and moisture mathematical model in building wall, experimental research on thermal and humid property of gypsum-based composite phase change material that with building gypsum as basis material, phase change microcapsule mixed with gypsum-based. Performance of gypsum-based composite phase change material was tested by saturated salt solution, simulation experiment of heat and moisture transfer, equivalence heat conduction test, etc; and the test results were analyzed by the calculus and mathematical fitting. The results show gypsum-based composite phase change material can provide good performance of thermal storage and saturation humidity; this subject firstly brings up important parameters of gypsum-based composite phase change material, such as the surface mass transfer coefficient, moisture diffusion coefficient, phase transformation factor, etc; there parameters provides an important basis for calculating the energy saving efficiency of gypsum-based composite phase change material.
  • Effects of support type to the CO hydrogenation performance and activation energy of cobalt-based catalytic materials
    XING Yu, LIU Zhenxin, XUE Yingying, WU Depeng,FANG Shaoming
    功能材料. 2016, 47(5): 73-77. https://doi.org/10.3969/j.issn.1001-9731.2016.05.013
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    Under the reduction temperature of 450-550 ℃, two types of crystalline cobalt species coexist within Co/ZnO catalytic material. There are many literature about the reactions of cobalt-based catalytic materials in Fischer-Tropsch synthesis (FTS). Comparison of the F-T catalytic performance of cobalt materials loaded over a Lewis basic support (ZnO) as well as a Lewis acidic support (γ-Al2O3) were conducted with a space velocity (SV) of 1 500 mL/g cat·h, a total pressure of 2.0 MPa and a H2 to CO ratio of 2:1. It was found that supports with different acidic or basic properties may significantly affect the CO hydrogenation activity, product selectivities and apparent activation energy of cobalt-based catalytic materials.
  • The fretting fatigue behavior of 35CrMoA under square and diamond paths
    TIAN Dandan, HE Guoqiu, SHEN Yue, LIU Xiaoshan, LV Shiquan, LIN Guobin, REN Jingdong, HU Jie
    功能材料. 2016, 47(5): 78-83. https://doi.org/10.3969/j.issn.1001-9731.2016.05.014
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    In this paper, the fretting fatigue behavior of 35CrMoA was studied at 150 MPa contact stress and 400 MPa equivalent stress amplitude under square and diamond paths. This included cycle stress response characters, fatigue life, morphological characteristics of fretting spot and the failure fracture. The result shows: under square path, 35CrMoA reached the stage of stability through slow and rapid softening, while under diamond path, it reached the final stage only through rapid softening; The fatigue life have little difference under those two paths; Under square path, the slip region is wide, and the stick region is relatively narrow, but opposite under diamond path; The crack extension perpendicular to the sample surface under square path, but for diamond path, the micro crack is tortuous, and extension to a certain angle with axis.
  • Finite element analysis and testing of the stacked piezoelectric composite ring array transducer
    WANG Hongwei
    功能材料. 2016, 47(5): 84-90. https://doi.org/10.3969/j.issn.1001-9731.2016.05.015
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    Using finite element software, the sensitive element of the axial stack piezoelectric composite ring array transducer is designed. The transducer has the characteristics of high frequency, wide band, and horizontal directional emission.Using finite element analysis software of ANSYS transducer sensitive element of modal analysis and harmonic response analysis, by changing the structure of the composite material parameters, analysis of obtained composite ring radial thickness of the vibration frequency and the bandwidth with the thickness, height and average radius, and to determine the best parameters required composite material preparation as for preparation of composite materials based on simulation. According to the optimal parameters obtained by the simulation, the sensitive element of the double ring laminated composite transducer is fabricated. After testing, the transducer has formed a distinct mode coupling vibration, the working bandwidth of -3 dBd is 90 kHZ. The test results are in good agreement with the simulation results, and the high frequency, broadband, and horizontal omnidirectional emission of the transducer are achieved.
  • Synthesisof silver nanowires by polyol process and the application in transparent & conductive films
    XIA Xingda, YANG Bingchu, ZHANG Xiang, ZHOU Conghua
    功能材料. 2016, 47(5): 91-95. https://doi.org/10.3969/j.issn.1001-9731.2016.05.016
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    Silver nanowires were synthesized from silver nitrate by polyol process with ethylene glycol as reducing agent and the reaction solution, polyvinyl pyrrolidone (PVP) as the surfactant. The influence of the reaction temperature and the adding amount of titanium dioxide (P25) in the mixed system on the length of silver nanowires were studied. The morphologies of silver products were investigated using scanning electron microscopy (SEM), the structure of AgNWs were characterized using X-ray powder diffraction (XRD), the transmittance of the silver nanowires film at different wavelength between 350 nm to 1 100 nm were investigated using UV visible transmission spectroscopy (UV-Vis). The results show that when the temperature is 140 ℃, and the addition of 4mg P25 in the reaction system, the average length of silver nanowires is the longest, the transmittance at 550 nm of silver nanowire film is 88% while the sheet resistance of the film is 12.1 Ω/□.
  • Preparation of polypyrrole-carboxylated chitosan composite and its improving the anti-corrosion property of epoxy resin coating
    YAN Qun,LI Chuanxian,SHI Enhua,YANG Shuang,YANG Fei
    功能材料. 2016, 47(5): 96-100. https://doi.org/10.3969/j.issn.1001-9731.2016.05.017
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    Polypyrrole-carboxylated chitosan composite was prepared in situ in an aqueous solution of carboxylated chitosan and p-toluene sulfonic acid using FeCl3 as the oxidizing agent. Fourier transform infrared spectroscopy(FT-IR) indicated that graft reaction took place between CCS and PPy to afford the PPy-CCS composite. The structure and morphology of the resulting composite were investigated using X-ray diffraction(XRD) and scanning electron microscope(SEM). It was discovered that the interplanar spacing increased gradually and the particle size decreased significantly with increasing the CCS content. Quantitative PPy-CCS composites (0.5wt%) were dispersed in epoxy resin. The influence of the composite on the anti-corrosion property of epoxy resin coating was studied by means of electrochemical workstation. The results indicate that PPy-CCS composite can markedly reduce the corrosion current of epoxy resin coating and improve its anti-corrosion property. More CCS content facilitates dispersion of the composite in epoxy resin and film formation on the surface of metal, thus further improving the anti-corrosion property of epoxy resin coating.
  • The research on controlling the degradation rate of MgZnSrLa alloy with the biomimetic coating
    FENG Jianjun, ZHANG Yajing, ZUO Lijing,YANG Wenhao
    功能材料. 2016, 47(5): 101-104. https://doi.org/10.3969/j.issn.1001-9731.2016.05.018
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    Magnesium and Magnesium alloys are considered to have wide developmental foreground due to their good biocompatibility and degradability, they would partially replace stainless steel, titanium alloys and other traditional medical metal materials, and the secondary surgery can be effectively avoided. However, the biggest problem of magnesium alloys as biomaterial is high corrosion rate and low mechanical properties, which badly confines their application in clinic. Hydroxyapatite (HA) was coated on surfaces of MgZnSrLa alloys by biomimetic technique, and the coatings were studied by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The corrosion properties of MgZnSrLa alloys with and without coating were researched by immersion corrosion and electrochemical corrosion tests in simulated body fluid (SBF). The results show that the MgZnSrLa alloy with coating exhibits better corrosion properties than without coating in SBF.
  • SiO2/APP composites gel formation in-situ timber and properties of flame retardance and smoke suppression
    XIA Liaoyuan,WU Yiqiang,LI Xianjun,HU Yunchu, HUANG Qiongtao
    功能材料. 2016, 47(5): 105-110. https://doi.org/10.3969/j.issn.1001-9731.2016.05.019
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    Firstly, wood was treated by high-strength microwave in order to improve its permeability. Then, the different mass ratio of silica source precursor and ammonium polyphosphate (APP) mixture solution was introduced into the wood through impregnating method under pressure, after that the SiO2/APP composites gel formation in-situ the wood after subsequently condensation and drying processing. The morphology, synergistic effect on fire-retardance and smoke behavior of the SiO2/APP composite were investigated by electronic scanning microscope (SEM), cone calorimeter and other techniques in present work. The results show that the SiO2/APP composite gel has excellent flame retardance and smoke suppression performance. As a result, silicon source and APP precursor mass ratio of 1:8 post-treatment samples ignited 155 s then extinguished. It is clearly seen that a reduction of total heat release (THR) to 93.7%, the total smoke production (TSP) and the mean of CO yield (m-COY) were decreased to 61.6% and 53.9%, respectively. The mass ratio of 1:9 specimens under the experimental conditions for 30 min is non-combustible, exists excellent flame retardance. By comparing the fire parameters of specimens before and after leaching, it is found that the gel composites can prevent the loss of APP, which can extend the period of wood flame retardance.
  • Synthesis, folic acid modification and characterization of core-shell structured upconversion NaYF4: Yb3+, Er3+@nSiO2@mSiO2 nanoparticles
    WU Hao, LIU Meifang, QI Ze, LIANG Xuhua, HU Xiaoyun, FAN Jun
    功能材料. 2016, 47(5): 111-115. https://doi.org/10.3969/j.issn.1001-9731.2016.05.020
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    Core-shell structure NaYF4:Yb3+,Er3+@nSiO2@mSiO2 nanoparticles were synthesized via hydrothermal method and modified by folic acid, then the structure and luminescence property of the samples were characterized by XRD, TEM, FT-IR, BET and upconversion luminescence spectrum. The results show that the obtained nanoparticles are cubic phase and uniformly coated with a layer of transparent SiO2, which possess obvious spherical core-shell structure with average size of 80 nm. The results in present research indicate that the folic acid is successfully modified on the surface of UCNPs. The UCNPs has a good up-conversion luminescent effect and the main emission peak is located in 524, 541, 655 nm. This study may provide a new idea to the development of drug carrier target which possess both biological imaging and good drug loading properties.
  • Dielectric and piezoelectric properties of BiScO3-Bi(Zn1/2Ti1/2)O3-PbTiO3 high Curie temperature ceramics
    ZHANG Qiang,LI Zhenrong
    功能材料. 2016, 47(5): 116-120. https://doi.org/10.3969/j.issn.1001-9731.2016.05.021
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    (1-x)Bi(Sc0.9(Zn1/2Ti1/2)0.1)O3-xPbTiO3 (BS-0.1BZT-xPT) ceramics were prepared by conventional powder-processing method. It is found that the lattice structure gradually changes from rhombohedral phase to tetragonal phase with increasing the PT content, and the PT content between 0.60 and 0.62 is the phase transitional region between the rhombohedral phase to the tetragonal phase. When PT content is 0.6, the samples exhibited good piezoelectric properties with d33 about 250 pC/N and kp about 43%. With increasing the PT content, the Curie temperature (Tc) is increased, and the value ofεr max is first increased and then decreased. Finally, it can be found that, when PT content is 0.6, the samples also exhibit good ferroelectric properties with Pr=34.4 μC/cm2 and Ec=19.2 kV/cm.
  • Reaction mechanism of epichlorohydrin-modified rice straw and its characterization
    HUANG Yu, LI Guanglu, CHAO Yuesheng, WANG Linshan, XING Ying
    功能材料. 2016, 47(5): 121-124. https://doi.org/10.3969/j.issn.1001-9731.2016.05.022
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    Etherification of rice straw with epichlorohydrin was carried out at 120 ℃ for 1-8 h in toluene with NaOH as catalyst. The extent of etherification was estimated by the use of weight percent gain (WPG) as an indication. The effects of reaction time on WPG and reaction mechanism of etherification were investigated. Natural rice straw, pretreated rice straw and epichlorohydrin modified rice straw were characterized by both degraded methods, such as neutral sugar analysis and elementary analysis, and non-destructive techniques, i.e., Fourier transform infrared (FT-IR), CP/MAS 13C nuclear magnetic resonance spectrum (CP/MAS 13C NMR). Characterization results indicate that the etherification of the hydroxyl groups were occurred at C2, C3 and C6 positions in the cellulose. Mass percentage of C and H increased, while mass percentage of O and amount of hydroxyls in rice straw decreased after modification.
  • Red LED spectral analysis based on organic fluorescent material
    YUAN Taoli, ZHANG Fanghui, ZHANG Silu
    功能材料. 2016, 47(5): 125-128. https://doi.org/10.3969/j.issn.1001-9731.2016.05.023
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    The organic fluorescent material 2,3,5,6-tetrakis (3,6-di-Butylcarbazo-9-y1)-1,4-dicyanobenzene (4CzTPN-Bu) is stimulated by the blue LED chip, its spectrum, light efficiency, chromaticity characteristics were studied. The results show that the spectrum from blue LED chip decreased gradually and disappeared, 4CzTPN-Bu phosphors spectrum gradually strengthen with the increase of mass fraction 4CzTPN-Bu, and when the mass fraction of 4CzTPN-Bu is 7%, the Forster energy transfer from blue chips to 4CzTPN-Bu is the most complete. In terms of light efficiency, with the increase of mass fraction, the device of light efficiency decreases after increasing first, up to maximum, then decreased. The occurrence of this process is mainly because there is t competition between he excited level of phosphors and the loss in the process of energy transfer. When 4CzTPN-Bu mass fraction increases, the color coordinates range from the blue, blue purple, red blue to the pure red, and color purity of the full red device reached 99.8%.
  • Preparation and characterization of the lightweight concrete produced by H2O2 chemical foaming in situ
    FAN Chuangang, WU Rui, HUANG Xingtian, CHEN He, MENG Fangfang, LI Jiamao
    功能材料. 2016, 47(5): 129-132. https://doi.org/10.3969/j.issn.1001-9731.2016.05.024
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    The lightweight concrete (LC) specimens were prepared using the method of chemical foaming in situ. In the foaming process, the H2O2 was used as foaming agent, the coarser and fine expanded perlites were used as lightweight aggregate and as carrier for H2O2 respectively, and the gelatin was used as foam stabilizer. The foaming reaction of H2O2 was taken place after it was being charged into carriers and the charged carriers were mixed into the mortar previously. The mortar was enclosed by the lightweight aggregates in fresh concrete. The properties of the resulting LC specimens were characterized systemically. It was found that the adding amount of 1.5wt% foam stabilizer had the promising stabilization for the foam formed in situ, which resulted in the bubbles with 0.5-1 mm diameter in homogeneous distribution. The bulk densities (BD) of resulting LC specimens were decreased with the increasing of the adding amount of foaming agent, and increased with the adding amount of foam stabilizer. For the resulting LC specimens with foam stabilizer amount of 1.5wt%, their 28 d compressive strengths (CS) and thermal conducting coefficients (TCC) were decreased with the increase of the amount of foaming agent. Among them, the resulting LC specimen with foaming agent of 1.4wt% had the 28 d CS of 21 MPa and the BD of 940 kg/m3. As compared with that of the resulting LC specimen without foaming agent, its specific strength value was improved by 14% and its TCC was decreased by 13%, respectively.
  • Fabrication and sensing properties of Au-doped flower-like In2O3 microstructures
    ZHANG Meng, LIANG Yanfei, ZHANG Jun, ZHANG Wendong, HU Jie
    功能材料. 2016, 47(5): 133-137. https://doi.org/10.3969/j.issn.1001-9731.2016.05.025
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    In this paper, the different concentrations of Au-doped (0mol%, 1mol%, 3mol% and 5mol%) flower-like In2O3 microstructures have been synthesized by hydrothermal method. The crystal phase, composition and morphology of the as-prepared In2O3 microstructures were investigated by X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and scanning electron microscope (SEM). The results exhibit that the average diameter of the flower-like microstructure reaches to 4 μm, and the measured thickness of the nanosheet is only 25 nm. Meanwhile, the gas sensing experiments were carried out on the fabricated Au-doped In2O3 gas sensors. The measured results show that the sensitivity of 3mol% Au-doped In2O3 gas sensor can reach to 23.1 at the optimum operating temperature(250 ℃)to 100×10-6 acetone, and the response/recovery times are 10 and 13 s, respectively. At last, the gas sensing mechanism of Au-doped In2O3 gas sensor was discussed.
  • Early-stage sintering kinetic characteristics of MnO2-doped NiFe2O4 spinel
    DU Jinjing,WANG Bin, LIU Yihan, YAO Guangchun
    功能材料. 2016, 47(5): 138-141. https://doi.org/10.3969/j.issn.1001-9731.2016.05.026
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    The influence of heating rates and MnO2 additives on early-stage sintering behavior to synthesize NiFe2O4 has been investigated. The results show that lower heating rates can produce more obvious shrinkage. Introduction of MnO2 can shift the onset of sintering toward lower temperatures. The early-stage sintering of NiO-Fe2O3 system is mainly controlled by grain boundary diffusion. For MnO2-doped samples, the early-stage sintering mechanisms are controlled by volume diffusion. The apparent activation energy of these doped samples decreased obviously, and for the 1.0wt% MnO2-doped sample, apparent activation energy decreased from 813.9 to 441.9 kJ/mol.
  • Calculation and analysis of the thermodynamic properties of the monoclinic and cubic copper oxide
    ZHENG Zhong, ZHOU Xiaolong, ZHOU Yunhong, ZHANG Hao, TAO Qiying, ZHOU Zhaobo
    功能材料. 2016, 47(5): 142-146. https://doi.org/10.3969/j.issn.1001-9731.2016.05.027
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    The crystal structure models of monoclinic and cubic copper oxide are established in this paper. Then the geometry optimization, phonon spectra and the thermodynamic properties are calculated and analyzed. The following conclusions are obtained. Thermodynamic instability of copper oxide is mainly dominated by the oxygen atom. The thermodynamic properties of monoclinic copper oxide is dominated by the copper atom and oxygen atom in both low temperature and high temperature. But the thermodynamic properties of cubic copper oxide is dominated by the copper atom in low temperature, and it is dominated by the oxygen atom in high temperature. The thermodynamic properties of two kinds of structural copper oxide are dominated by calculation of phonon density. The thermodynamic temperature of the phase transition between the monoclinic crystal and the cubic copper oxide crystal is 1 013.28 K.
  • Modified beewax with such mixed modifiers as chitosan and its effect on compressed poplar surface performance
    REN Lili,CAI Yingchun,REN Limin,SUN Xiaomin,KONG Fanxu,XUAN Lihui,CHAI Haojie
    功能材料. 2016, 47(5): 147-153. https://doi.org/10.3969/j.issn.1001-9731.2016.05.028
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    Use nano-TiO2, chitosan, acid dyes, and neutral dyes for direct blending modification respectively in the procession. Treat the compressed poplar as based material polished with melted modified beeswax which is represented by methods including SEM, FT-IR, TG. Results as follows: elements including O, N, Au, S, Ti in the polished modification materials successfully permeated into poplar pits, which showed that modification beeswax had strong permeability, colorfully. When 10% mass fraction of beeswax, 0.2% mass fraction of chitosan, 0.05% mass fraction of neutral red were blended to modify, there was uniform color on compressed poplar surface and considerable improvement in respect of durability, surface glossiness, angle of contact and obvious texture transition, to an extent that painting effect was perfect on the surface of compressed poplar or that wax modification gained a dreamful result.
  • Modifications of montmorillonite and rheological behaviors of their suspensions
    LIAO Xiaofeng, BO Wenxiang, YAN Qiuling, YIN Xianze, CHEN Dongzhi, ZHANG Hongwei
    功能材料. 2016, 47(5): 154-158. https://doi.org/10.3969/j.issn.1001-9731.2016.05.029
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Four small molecular compounds which could occur non-covalent interactions with montmorillonite (hexadecyl trimethyl ammonium bromide, CTAB, sodium dodecyl sulfate, SDS, 4-aminobutyric acid, AA and Octa-quaternary ammonium silsesquioxane, Poss), two small molecular compounds which could occur covalent interactions with montmorillonite (1,3-propanesultone, PS and 3-aminopropyltriethoxysilane, KH550) and three polymer (Polyethylenimine, PEI, poly(acrylamide-co-diallyldimethylammonium chloride), PAADDA and quaternary ammonium polyethylenimine, QPEI) were used to modify montmorillonite. Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis and laser particle size analyzer were employed to investigate modified montmorillonites. And rheological behaviors of suspensions consisted of modified montmorillonite and styrene and 4-chloromethylstyrene copolymer in N,N′-dimethylacetamide also were studied. The results showed that the silicate layer spacing of all modified montmorillonites have been broadened and the layer spacing of the modified montmorillonite with QPEI was up to 2.41 nm. The stronger the hydrophobicity of montmorillonites modified by small molecular compounds was, the higher the Zeta potential of the corresponding montmorillonite was. The zeta potential of the modified montmorillonite with CTAB increased from -38.5 mV to 31.2 mV. The suspensions containing modified montmorillonites demonstrated a behavior of non-Newtonian fluid and revealed a slight viscosity reduction in the high shear rate region, the viscosity of suspensions containing the modified montmorillonite with QPEI increased about 40%.
  • Effects of temperature on the structure and performance of LiMnPO4/C prepared by a microwave solvothermal method
    LIU Zhenzhen, HUANG Qiaoying, YAO Hua, SU Jing, LONG Yunfei, LV Xiaoyan, WEN Yanxuan
    功能材料. 2016, 47(5): 159-164. https://doi.org/10.3969/j.issn.1001-9731.2016.05.030
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    LiMnPO4/C composites were prepared by a microwave solvothermal method using MnSO4·H2O and Li3PO4 precursor as source materials, water and diethylene glycol mixed solvents as reaction solvents. The effects of temperature on the structure and electrochemical performances of samples were investigated by XRD, SEM, CV, EIS charge/discharge tests. As the temperature increased, block like Li3PO4 precursor gradually transformed into a flaky LiMnPO4. The sample prepared at 190 ℃ formed the olivine structure with the space group Pmnb. The prepared LiMnPO4/C delivered an initial discharge capacity of 108.3 mAh/g with a capacity retention of 99.9% after 50 cycles at 1 C.
  • Research on synthesis and thermal stability of hexa (phenoxy) cyclotriphosphazene
    BAO Dongmei, LIU Jiping, XIE Bing, PAN Yu, LU Yunxian,WANG Huabiao
    功能材料. 2016, 47(5): 165-169. https://doi.org/10.3969/j.issn.1001-9731.2016.05.031
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    Hexa (phenoxy) cyclotriphosphazene(HPCTP) was an environmentally friendly flame retardant and it has attracted significant attention because of its excellent heat-resistance and flame-resistance. In the study, HPCTP was synthesized by the reaction of hexachlorocyclotriphosphazene (HCCP) with phenol and sodium hydroxide, and characterized by means of infrared spectrometer (IR), X-Ray diffraction (XRD),nuclear magnetic resonance (NMR), elemental analysis(EA), mass spectrometry(MS), differential scanning calorimetry(DSC) and thermogravimetry(TG). The influences of reaction temperature(T), reaction time(t) and raw material ratio on the yield of HPCTP were investigated. The results showed when n(phenol):n(sodium hydroxide)=1:1, n(phenol):n(HCCP)=8:1,T=65 ℃, t=48 h, THF as solvent, the yield of HPCTP was the highest and amounted up to 92.0%.Thermal analysis results showed that the onset decomposition temperature of HPCTP was 365 ℃. Therefore, HPCTP was a flame retardant with perfect thermal stability, and it can be applied in high processing temperature system.
  • Numerical simulation research on hysteresis nonlinear of giant magnetostrictive actuator
    YU Caofeng, HE Tao, WANG Chuanli,DENG Haishun,BAO Yan
    功能材料. 2016, 47(5): 170-175. https://doi.org/10.3969/j.issn.1001-9731.2016.05.032
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    Aiming at the phenomenon on the hysteresis nonlinearity of giant magnetostrictive actuator (GMA), based on the classical Jiles-Atherton model, a hysteresis nonlinear model is establised containing bias magnetic field intensity and preloading stress of GMA. The law of GMA magnetization curves and magnetostrictive strain curves are obtained respectively about bias magnetic field intensity and preloading stress by numerical simulation analysis. Analysis results show that magnetization curve and magnetostrictive strain curve are influenced greatly by the bias magnetic field intensity at shape, and that the linear range of the magnetization curve can be changed and the frequency doubling effect of magnetostrictive strain curve can be restrained or eliminated by adjusting the size of the bias magnetic field intensity, and that the magnetization curve and magnetostrictive strain curve shape are affected by preloading stress, and that with the increase of preloading stress, the rate of change of magnetization curve and magnetostrictive strain curve are increasing and the amplitude were reduced slowly. The hysteresis nonlinearity model is reasonable beacuse these conclusions are consistent with the experiments.
  • Study on the water decomposition reaction by Zr30Ni70 alloy
    YAO Yong,HUANG Zhiyong,XIONG Renjin,ZHANG Zhi,SONG Jiangfeng, LUO Deli
    功能材料. 2016, 47(5): 176-179. https://doi.org/10.3969/j.issn.1001-9731.2016.05.033
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    In order to fulfill the requirement of tritiated water decomposition in tritium extraction system in ITER HCCB-TBM, Zr30Ni70 was selected and the following performances at 500 ℃ were investigated: hydrogen absorption property, phase transformation in water decomposition process and trace water decomposition reaction in micro fixed-bed reactor. The results showed that the hydrogen absorption in alloy obeys to Sievert law with very low capactity, the effective element in alloy for water decomposition is Zr and the product is ZrO2. The breakthrough capacity increased with the decrease of powder size, the granulation of powder with 400 mesh size could guarantee both high breakthrough capacity and low pressure drop, the breakthrough capacity didn’t change with the variety of water concentration and with the hydrogen concentration less than 1%, the utilization rate of bed exceeded 98% with the packing height larger than 120 mm.
    • Process & Technology
  • Microstructures and mechanical properties of bulk nanoporous copper fabricated by dealloying Al-Cu alloys
    YAO Yanfei, LIAN Lixian, LIU Ying, KONG Qingquan, AN Xuguang
    功能材料. 2016, 47(5): 180-184. https://doi.org/10.3969/j.issn.1001-9731.2016.05.034
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    Bulk nanoporous copper (BNPC) with different morphology was synthesized through chemical dealloying of nanocrystalline Al-Cu alloys prepared by mechanical alloying combining with spark plasma sintering. The effect of the composition on phases of precursor alloys, as well as microstructure and mechanical properties of BNPC, was investigated. The results show that when the proportion of copper in alloys is low, the alloys comprise of α-Al and Al2Cu phase. However, with the increase of copper, the contents of α-Al decrease and finally the precursor alloy which simply contains Al2Cu phase can be formed. After dealloying, we found the bimodal pore structures gradually become uniform and interconnected because of the increase of copper. Moreover, uniaxial compression tests of bulk nanoporous copper were investigated. With the increase of Cu atom fraction in precursor alloy, the compression properties of bulk samples improved dramatically.
  • Influences of halogen-free flame retardant to ethylene-vinyl acetate copolymer
    LIU Xiaoqing, XU Lusi, JI Weikun, YANG Chengjun, YUAN Yuan
    功能材料. 2016, 47(5): 185-189. https://doi.org/10.3969/j.issn.1001-9731.2016.05.035
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    The authors studied the influences of Halogen-free flame retardant to elastic ethylene-vinyl acetate (EVA) foaming material, especially its flame retardant properties. Three types of flame retardants were investigated: magnesium hydroxide (MH), aluminum hydroxide (ATH), and red phosphorus. The results showed that, individually, each of the flame retardant improved the flame retardant properties of EVA foaming material, to various degrees.However, none of the flame retardant by itself provided adequate improvement. On the other hand, by compounding MH, ATH and red phosphorus together, the flame retardant properties were improved significantly. The best improvement was achieved with the following combination: MH 32.1%, ATH 10.7% and red phosphorus 5%. The corresponding properties of the resulting EVA foaming material were: Coefficient of Thermal Conductivity: 0.079 W/(m·K); the limit oxygen index (LOI): 34.5%; the vertical burning level:V-O; the horizontal burning level: HB. In summary, the resulting EVA foaming material meets the burning level requirements B1 for insulation materials, while at the same time resolved the brittleness issue of EVA foaming materials.
  • Preparation of nano hollow TiO2 microspheres
    ZOU Hanbo, LU Heng, CHEN Shengzhou
    功能材料. 2016, 47(5): 190-194. https://doi.org/10.3969/j.issn.1001-9731.2016.05.036
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    PS/TiO2 microspheres were synthesized with PS emulsion as templates. Nano hollow TiO2 microspheres was formed through refluxing the nano emulsion and dissolving the PS template in the PS/TiO2 microspheres. The effects of different monomer concentration, the dosage of initiator and emulsifier, the reaction temperature on the performance of PS emulsion were discussed. X-ray diffraction (XRD), thermogravimetric analyzer (TG), specific surface area tester (BET), infrared spectrum (IR) and ultraviolet-visible spectroscopy (UV-Vis) were used to characterize the microspheres. The optimal conditions were as follows, the concentration of monomer was 20%, the ratios of the initiator and emulsifier to the monomer mass were 0.3% and 3%, respectively, the reflux time was 12 h at 80 ℃. The nano TiO2 hollow spheres with the external diameter and specific surface area about 180 nm and 283.4 m2/g were synthesized, respectively. The thin shell was composed of closely packed TiO2 nanoparticles with the diameter of 8-10 nm.
  • Study on procine acellular dermal matrix crosslinked by Isomaltooligosaccharide dialdehyde
    CHEN Yining, DAN Nianhua,WANG Lei, HE Can, DAN Weihua
    功能材料. 2016, 47(5): 195-200. https://doi.org/10.3969/j.issn.1001-9731.2016.05.037
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    Porcine acellular dermal matrix (pADM) was crosslinked by a new type crosslinker which is called Isomaltooligosaccharide dialdehyde (IMODA), the crosslinking conditions were optimized. the modification index, fourier transform infrared spectroscopy, mechanical properties, hydrophilicity, scanning electron microscopy and the cytotoxicity of IMODA-pADM were tested. The results indicated that when the dosage, reaction temperature and reaction time were increased, the shrinkage temperature was increased firstly and then gradually stayed steady, when the pH value was increased,the shrinkage temperature was increased firstly and then decreased. It was showed that the comprehensive performance was best when the reaction temperature was 37 ℃, the reaction time was 48 h, dosage was 16%,pH value was 9.4. After crosslinking, the tensile strength of IMODA-pADM was improved, the hydrophilicity was weakened, the surface of the material is conducive to the adhesion and growth of cells, and the ctotoxicity grade of crosslinked material was grade 0-Ⅰ.
  • Effect of alkali etching solution concentration on secondary zinc dipping on pure aluminum surface
    ZHANG Jian,CHEN Guohong,WANG Ruoming, MIAO Chunhui,ZHENG Zhixiang,TANG Wenming
    功能材料. 2016, 47(5): 201-206. https://doi.org/10.3969/j.issn.1001-9731.2016.05.038
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    Twice zinc dipping is the pretreatment process for electroplating the pure aluminum and alloys. If alkali erosion of Al is not suitable, it has a negative effect on the zincking, even subsequent electroplating process of the Al substrate. After etching in the NaOH aqueous solutions with different concentrations and secondary zinc dipping, surface morphologies of the pure Al substrates and the Zn layer were observed. And thus, the quality of the Cu plating layer on the Al substrate is also evaluated. The results show that big and deep corrosion holes are formed on the Al substrate surface, especially at the Al boundaries, when etching in the 20 g/L NaOH aqueous solution for 1 min. These holes can not be filled by the Zn deposited particles in the secondary zinc dipping process. However, as the concentration of the NaOH solution decreased to 5 g/L, the holes on Al substrate surface are smaller and more shallow than the former, when the Al substrate dipping in the solution for the same time. Roughness of the etched surface is modest, which is beneficial to the secondary zinc dipping of the Al substrate. The Zn layer has a coverage ratio more than 95%, and the electroplating Cu layer on it is very fine.
  • The fabrication of SiO2@Ag@Cu2O and SiO2@Ag@Cu core-shell structure
    LIANG Xiao,LIAN Lixian,LIU Ying,KONG Qingquan,WANG Li
    功能材料. 2016, 47(5): 207-211. https://doi.org/10.3969/j.issn.1001-9731.2016.05.039
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    In this article, SiO2@Ag@Cu and SiO2@Ag@Cu2O composite core-shell structure is synthesized by electroless plating a Cu2O or Cu shell on the powder of SiO2@Ag, where the basic SiO2@Ag is fabricated through the silver plating on different sizes of silica templates. It is found that the changes of parameters like pH value and reducing agent addition rate can regulate and control the outmost shell phase: the Cu2O shell is appreciable when pH maintains between 10-11 with lower reducing agent addition rate, while higher pH and addition rate of reducing agent will result in a shell mainly composed of Cu.
  • Preparation of monodispersed spherical silicon dioxide particles used as pattern transfer etching mask
    WANG Ying, WANG Quandai, XIAO Jiming, WANG Li, LI Pengyang
    功能材料. 2016, 47(5): 212-216. https://doi.org/10.3969/j.issn.1001-9731.2016.05.040
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    In this work, the monodispered spherical silicon dioxide particles have been prepared through the traditional sol-gel process with ammonia as catalyst and with TEOS as silica source in anhydrous ethanol. The influences of various reaction conditions involving TEOS concentration, ammonia concentration and water concentration on the particle size and morphology have been investigated through the field emission scanning electron microscope. Experimental results show that the diameter of the spherical SiO2 particle increases with the increase of TEOS concentration and ammonia concentration and decreases with the increase of deionized water concentration. Besides, the higher temperature reduced agglomeration significantly and aging time influenceagglomeration. However, the agglomeration due to aging is reversible through agitation in ultrasonic set-up. The formation mechanism of silicon dioxide particles under different reaction conditions has been discussed. Finally, the agglomeration due to the high surface energy and poor stability of the nano-SiO2 particles is analyzed employing DLVO theory and the preliminary solution is proposed.
  • Synthesis and characterization of pendent-sulfonatedpoly (aryl ether sulfone) copolymers for proton exchange membranes
    LI Dongsheng
    功能材料. 2016, 47(5): 217-223. https://doi.org/10.3969/j.issn.1001-9731.2016.05.041
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    Poly(aryl ether sulfone) copolymers (Co-PSFs) containing sulfonated phenyl pendent groups are synthesized through nucleophilic aromatic substitution polycondensation by using 1,1-Bis(4-hydroxyphenyl)-1-phenylethane, hydroquinone and 4, 4’-dichlorodiphenyl sulfone, followed by postsulfonation with chlorosulfonic acid at 0 ℃. The chemical structures of sulfonated poly(arylene ether sulfone)s copolymers (SCo-PSFs) are characterized by IR and 1HNMR spectra. These ionomers generally show good thermal stability with glass transition temperaturesand initial degradation temperature. Transmission electron microscopic observations reveal that SCo-PSFs membranes form well-defined microphase separated structures. The samples have moderate mechanical property with Young’s modulus of 0.29-1.10 GPa and SCo-PSF100 with the IEC value 1.65 mmol/g shows conductivity of 1.2×10-1 S/cm at 80 ℃ and the methanol permeability values of membranes at room temperature were in the range of 2.15 × 10-7 to 5.49 × 10-7 cm2/s at 20 ℃.
  • Epitaxial growth of wurtzite ZnS thin films on c-plane sapphire substrates by PLD
    ZHANG Lei,FANG Long,LIU Panke,LIU Yueyan, LI Mingkai,HE Yunbin
    功能材料. 2016, 47(5): 224-226. https://doi.org/10.3969/j.issn.1001-9731.2016.05.042
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    A series of ZnS thin films were fabricated by pulsed laser deposition on c-sapphire using a ZnS target, and characterized by X-ray diffraction in terms of the crystal structure and orientation with respect to the substrate. Firstly, we have investigated the growth temperature effects on the quality of ZnS films in the temperature range of 400-750 ℃. It was found that all ZnS thin films have a wurtzite structure, and the crystalline quality of the ZnS films improves with increasing deposition temperature. The highest quality ZnS films were obtained at 750 ℃, which show epitaxial relationship with the substrate as ZnS(001)∥Al2O3(001) and ZnS(110)∥Al2O3(110). Then we grew ZnS films with ZnO buffer layers deposited at different time (1, 2 and 3 min) and fixed temperature of 750 ℃. The results suggest that applying a ZnO buffer layer can effectively improve the crystal quality of ZnS films. In particular, the ZnS film grown with a 2min-deposited ZnO buffer layer exhibits a rocking curve half width of (002) plane as small as 1.35°. These results are of importance when considering ZnS films for making ZnS related optoelectronic devices.
  • Influenec of process gas ratio on the properties of alumina film deposited by microwave mocvd thchnology
    ZHANG Jian, BA Dechun, ZHAO Chongling,DU Guangyu,LIU Kun
    功能材料. 2016, 47(5): 227-230. https://doi.org/10.3969/j.issn.1001-9731.2016.05.043
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    AlO,as Surface passivation film to P type silicon in high efficiency solar cells, caused concern by leading company.AlO thin film were deposited onto monocrystalline silicon using self-developed LMW-PECVD technology with difference process gas proportion between N2O and TMA. Composition and surface morphology of the films were investigated by SEM. SE800 spectroscopic ellipsometer was employed to measure thickness and refractivity of the films. The result shows that, with the increasing of N2O ratio, element ratio of O/Al in film is on the rise; deposition rate of AlO film remarkably decrease;refractivity of the film began to level off and then decreased rapidly. So,Process gas proportion plays an important role in AlO films.
  • Preparation and properties of PLA/PBAT/PCL biodegradable composites
    ZHOU Zhibin,LIU Yuejun,CUI Lingna,WEN Tao
    功能材料. 2016, 47(5): 231-237. https://doi.org/10.3969/j.issn.1001-9731.2016.05.044
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    PLA and PBAT were blended in a twin-screw extruder with the compatilizer of PCL to provide PLA/PBAT/PCL composites.The thermal properties,mechanical properties and rheological performance of PLA/PBAT/PCL composites were studied.The results showed:when the content of PCL was 2%,the impact strength and tensile strength of composite reached to the maximum value;with the increase of the content of PBAT,the crystallization temperature Tc of composite gradually decreased,while the thermal initial decomposition temperature To of composite presented a downward trend after rising first;when the content of PBAT was 15%,the initial decomposition temperature To of composite reached to 334.18 ℃;when the content of PBAT increased from 0% to 20%,the impact strength of the composite increased from 3.26 to 7.07 kJ/m2,while the elongation at break increased from 2.46% to 118.22%;The elasticity of the composite also increased with the concentration of PBAT.
  • Thermoelectric properties of Ag2S/Bi2S3 composite synthesized by hydrothermal method
    LUO Shijie,XIAN Cong,WANG Wei,XIE Shuhong, CHEN Qiufan,YAN Yanci,ZHOU Xiaoyuan
    功能材料. 2016, 47(5): 238-242. https://doi.org/10.3969/j.issn.1001-9731.2016.05.045
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    Ag2S/Bi2S3 composite powders with spherical structure was synthesized successfully by hydrothermal method and then pressed into bulk by spark plasma sintering technique. The crystalline structure and morphology of the powder was determined by X-ray diffraction and scanning electron microscopy. The effect of Ag2S content on the Ag2S/Bi2S3 composite thermoelectric properties was investigated systematically. The thermoelectric performance results showed that the Seebeck coefficients of all the Ag2S/Bi2S3 samples were negative, which indicated that the composites were n-type semiconductors. Appropriate Ag2S added in Bi2S3 could not only reduce the thermal conductivity, but also enhanced the electrical conductivity. The maximal ZT of Bi2S3 with 3% Ag2S was 0.29 at 724 K, which is twice than that of the pure Bi2S3.
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