30 December 2016, Volume 47 Issue 12

    

• Select all
  |

Focuses& Concerns
• Select
  Study on the correlation between surface energy andtribological property of silicon-nitride films

  SHI Zhifeng,HUANG Nan,WANG Lin,NING Chengyun,WANG Yingjun

  功能材料. 2016, 47(12): 12001-12006. https://doi.org/10.3969/j.issn.1001-9731.2016.12.001

  Abstract ( ) Download PDF ( ) Knowledge map Save

  A systematic study on the preparation and properties of silicon-nitride (Si-N) films under varying different substrate bias voltage was carried out on the matrix of Co-Cr-Mo alloy by direct current unbalanced magnetron sputtering techniques. With the increase in the substrate bias voltage from 50 to 200 V, the ratio of polar component and dispersion component of the films surface energy decreases from 0.5 to 0.25, the surface tension between solid surface of the Si-N films and water has increased rapidly. The films showed high hardness and elastic modulus at 100 V, while the state of samples between sputtering and the control for Si, Ar, and N plasma reached to equilibrium at 150 V to grow slow and dense. The lowest mean steady-state friction coefficient of 0.18 was obtained for the Si-N/SiC tribo-pair in FBS, and that in ambient air is approximately 0.5. The as-deposited Si-N films are amphipathic nature, the Si-N films showed good tribological properties in wet environment, and the friction coefficient fell sharply in fetal bovine serum. So it is a kind of potential water medium lubrication of biological machinery membrane layer.
• Select
  Study on transmission performance of transparent concrete

  ZHOU Zhi, SHEN Juan, JIAO Siyu, YANG Mingjie, YANG Huanyu

  功能材料. 2016, 47(12): 12007-12013. https://doi.org/10.3969/j.issn.1001-9731.2016.12.002

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Transparent concrete, as a new style functional material, is made of a large number of fibers or transparent resin with ordinary concrete, with the characteristics of high transparency thus allowing the sunlight to penetrate through. In order to facilitate further application of transparency concrete materials and achieve the purpose of saving the fiber and concrete materials, improving the efficiency of the analysis and providing light performance analysis of reliable data, the paper established a evaluation and forecast model to assess transparent performance of transparent concrete by means of combining with the light performance test of transparent concrete and using ZEMAX for simulation of the test. It was found that light transmittance had the relationship with optical fiber type and its spatial distribution and the evaluation index and calculation method of light performance were summed up. Besides, the results show that the light performance has the relationship with the density of optical fiber configuration, fiber properties as well as the block surface polishing degree. Light transmittance through the fiber spacing span is monotonically decreasing exponential function, and the fiber radius is monotonically increasing exponential function.
• Select
  Effect of Y addition on the microstructure and mechanical properties of Mg-6Zn-1Mn magnesium alloy

  ZHANG Hongju,ZHANG Dingfei,PAN Fusheng

  功能材料. 2016, 47(12): 12014-12018. https://doi.org/10.3969/j.issn.1001-9731.2016.12.003

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The microstructure and mechanical properties of Mg-6Zn-1Mn magnesium alloy with different Y content were investigated by OM, XRD and tensile testing, respectively. It was found that the phase evolution with the Y content of as-cast ZM61 magnesium alloys was α-Mg+ Mg7Zn3→α-Mg+I→α-Mg+W→α-Mg+X, which is mainly attributed to the different atomic ratio of Zn/Y. when the Y content was lower than 2%, the extruded ZM61 magnesium alloys show a high strength and good ductility due to the precipitation of fine second phase under extrusion. In addition, dimple size is larger from the fracture surface. With the incensement of Y, the second phase particles, mainly precipiting on the grain boundary, become larger, which is difficult to be crushed and refined under the hot extrusion process. Therefore, the comprehensive mechanical properties of extruded alloys decrease due to the weakening interfacial energy of the precipitates and matrix.
• Select
  Chloride binding capacity of portland cement subjected to complex salt corrosion

  XIAO Jia,GUO Minglei

  功能材料. 2016, 47(12): 12019-12024. https://doi.org/10.3969/j.issn.1001-9731.2016.12.004

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Chloride binding capacity of portland cement subjected to complex corrosion of sulfate, carbonate, nitrate with chloride salt was studied. The chloride ion binding rate of cement pastes were obtained through free chloride ions concentrations testing and analyzed by XRD and pH testing techniques. The results show that chloride ion binding rate of cement pastes increased with age increasing. With chloride ion concentration increasing, the amount of formation of Friedel’s salt increase, while the chloride ion binding rate increase at first then decreased. With sulfate and carbonate concentration increasing, chloride ion binding rate of cement pastes decrease similarly which decrease slightly larger with sulfate than carbonate. Sulfate and carbonate can react with AFm to the generation of 3CaO·Al₂O₃·3CaSO₄·31H₂O and 3CaO·Al₂O₃·CaCO₃·12H₂O respectively, and it lead to the rise of the pH value and reduce the amount of formation of Friedel’s salt. Nitrate has no effect on chloride binding capacity of portland cement.
• Select
  Research on microstructure model and structure formation mechanism of CAE

  HUANG Shaolong, JIN Fan, SHEN Fan, HU Shuguang

  功能材料. 2016, 47(12): 12025-12028. https://doi.org/10.3969/j.issn.1001-9731.2016.12.005

  Abstract ( ) Download PDF ( ) Knowledge map Save

  CAE meet requirement for paving in steel bridge deck pavement materials, which possessing cohesiveness to steel plate, good flexibility and high temperature stability. This paper used SEM to investigate the micro morphology of CAE: asphalt and epoxy present hydration net structure connected by cement. It inferred that the formation of CAE including four processes: dispersion, reaction, net structure forming, strength development, which was validated by proper experiment.
Review & Advance
• Select
  Progress in preparation of metal nanoparticles coated by polymer

  XU Guoyuan, LI Aixiang, CHEN Fuqiang, LI Qiuhong

  功能材料. 2016, 47(12): 12029-12037. https://doi.org/10.3969/j.issn.1001-9731.2016.12.006

  Abstract ( ) Download PDF ( ) Knowledge map Save

  In recent years, metal nanoparticles (NPs), particularly gold, silver, and copper, have attracted significant research interest due to their unique thermal, electrical, and optical properties and are of great important potential applications in many fields such as nano-electronics, nano-optics, data storage, catalyst, biology, and biomedicine. Metal NPs coated by polymer shell are currently undergoing intense research. On one hand, they can keep the special properties and function of metal NPs. On the other hand, the polymer shell not only can improve the long term stability and regulate the solubility of NPs but also improve the compatibility between metal NPs and polymer matrix and the processing properties etc. In this paper, the recent progress in preparation methods of metal NPs coated by polymer shell was reviewed in detail, including emulsion polymerization, precipitation polymerization, in situ polymerization, ligand exchange method, and shell crosslink method. And the advantages and disadvantages of every method were put forward and analyzed. At last, the foregrounds and challenge of metal NPs coated by polymer shell materials were also discussed. The industry product of metal NPs compactly coated by polymer shell is still an important challenge. And new preparation method for industry product also needs to be further improved.
• Select
  The recent development of lithium titanate as anode materials for lithium-ion batteries

  WEN Shujian, ZHANG Yixiao, CHEN Yang, SONG Chunyang, CUI Xiaoli

  功能材料. 2016, 47(12): 12038-12049. https://doi.org/10.3969/j.issn.1001-9731.2016.12.007

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Lithium-ion batteries are one of the most promising battery systems to be widely used in portable electronics, electric vehicles, and energy storage systems. Lithium titanate (Li₄Ti₅O₁₂) has been intensively investigated as an important anode material for lithium-ion batteries due to its high potential of around 1.55 V (vs. Li/Li⁺) during charge and discharge, excellent cycling stability, and high thermal stability and safety. This paper reviews the recent advances in structure and electrochemical performance of lithium titanate involving on new preparation methods of micro/macro particle, surface modification and ion doping. The micro/macro particles can provide greater surface area and shorten the migration distance for Li⁺. The better contact between the electrode and electrolyte produces benefits transportation of Li⁺, which improves the cycling performance of Li₄Ti₅O₁₂. The major methods of surface modification are carbon coating, forming Li₄Ti₅O₁₂/metal composites and modification by new surface phase. Such methods aim to increase the conductivity and improve the cycling performance of Li₄Ti₅O₁₂. Doping ions increases the electron concentration and electronic conductivity since the partial Ti⁴⁺ transform to Ti³⁺. The future development of lithium titanate as anode materials in lithium-ion batteries is also prospected in this review.
• Select
  Progress on the conducting mechanism of the surface-modified diamond films

  LIU Fengbin,CHEN Wenbin

  功能材料. 2016, 47(12): 12050-12057. https://doi.org/10.3969/j.issn.1001-9731.2016.12.008

  Abstract ( ) Download PDF ( ) Knowledge map Save

  By different surface modification, the diamond films would show various surface conductivities. This makes it have a broad application prospect in the development of in-plane micro-electronics and micro-electrochemical devices. By summarizing the research at home and abroad, combined with the recent research results of our group, the preparation methods of the various surface-modified diamond films are described in detail. In addition, the equilibrium geometries and electronic structure of the surface-modified diamond films are discussed. Finally, the main opinions on the conducting mechanism of the surface-modified diamond films are also analyzed. On the basis of the above, the remarkable research points on the surface conductivity of the diamond films with different surface modification in the future are proposed.
• Select
  Key issues in hybrid perovskite solar cells

  KE Xiaolong, WANG Xiaoping, WANG Lijun, NING Renmin, CHEN Haijiang,
  SONG Mingli, LIAN Jiqing

  功能材料. 2016, 47(12): 12058-12063. https://doi.org/10.3969/j.issn.1001-9731.2016.12.009

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Because of the PSCs low cost and high efficiency significantly advantage, it becomes the global hot topic in the field of solar cells in the past two years. However, its low reproducibility and stability limit the wide application of this potential technology. How to obtain continuous and compact high quality lead halide perovskite membrane layer also severely limits the research and development of the future. This paper introduces the organic-inorganic hybrid perovskite structure and performance, reviews the research progress of solar cell based on such materials, discusses the working mechanism and summarizes the key problems affecting the battery performance, illustrates the development direction of the perovskite.
• Select
  Application and advance in the research of cathode materialsfor Li-ion batteries by using electrospinning technology

  LUO Biao, ZHANG Yongxin, XIAO Qizhen, LI Zhaohui, LEI Gangtie

  功能材料. 2016, 47(12): 12064-12070. https://doi.org/10.3969/j.issn.1001-9731.2016.12.010

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Electrospinning is a new technology for preparing nano-fiber, nano-belt and nano-membrane. In recent years, it was widely used in biomedical and materials engineering. In this review, we introduce the principle and the development process of electrospinning technology,especially the application and advance in the research of high-performance cathode materials for Li-ion batteries by using electrospinning technology.
• Select
  Research progress on preparation technology of boron nitride nanosheets

  ZHAO Di, KE Ruilin, ZOU Xiong, MAO Lin, HU Xingbing, WANG Jinhe

  功能材料. 2016, 47(12): 12071-12075. https://doi.org/10.3969/j.issn.1001-9731.2016.12.011

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Boron nitride nanosheets has attracted much interest in recent years due to its unique and outstanding properties in physics, chemistry, electronics and materials academia. Preparation methods of boron nitride nanosheets used in recent years are intensively introduced, including chemical vapor deposition, chemical cleavage, ultrasonication exfoliation and low-energy ball milling, ect. Each method’s advantages and shortcomings are further discussed in detail. The preparations of boron nitride nanosheets are also prospected.
• Select
  Latest studies of doped Bi₂WO₆ visible light photocatalyst materials

  ZHENG Huajie, MENG Fanmei, GUAN Yi, ZHU Jiao

  功能材料. 2016, 47(12): 12076-12082. https://doi.org/10.3969/j.issn.1001-9731.2016.12.012

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The band gap of Bi₂WO₆ is only 2.7 eV, which allows it absorb ultraviolet and visible light at the same time. With the characteristics of controllable morphology, strong oxidizing property, light corrosion resistance, non-toxic and non-polluting, Bi₂WO₆ becomes an ideal material for visible light photocatalysis. However, the quantum efficiency of pure Bi₂WO₆ is relatively low, photo generated electron-hole recombine easily. So, further modification of Bi₂WO₆ has become a hot research topic in recent years. At present, the research method of Bi₂WO₆ is mainly focused on the doping modification. The doping modification has important effects on the electronic structure, appearance, particle size and surface properties of the catalyst, so as to improve the quantum efficiency, reduce the width of the band gap and electron hole recombination rate, thus improve the photocatalytic capability. In this paper, we introduced the latest progress in the study of the doped Bi₂WO₆ photocatalyst from mental doping, nonmetals doping, co-doping and so on. We also clarified the mechanism of photocatalytic reaction and prospected for its development.
• Select
  Research progress of nano ZnO materials in dye/quantum dot sensitized solar cells

  HU Jinglu,XU Tingting,CHEN Lixin, MA Tengbo, WEI Pengli

  功能材料. 2016, 47(12): 12083-12089. https://doi.org/10.3969/j.issn.1001-9731.2016.12.013

  Abstract ( ) Download PDF ( ) Knowledge map Save

  ZnO is an environmental-friendly semiconductor material with excellent performance. It has a wide application in energy, information, environment, etc, owing to numerous advantages of being abundant, simple preparation and feasible morphology controllable morphology structures. ZnO is commonly used as photoanode materials in dye/quantum dot sensitized solar cells, to loadling light absorber, accepting and transporting electrons. A series of different nanostructures, such as nanoparticles, nanowires, nanosheets and nanoflowers have been used in the sensitized solar cells, and the performance of the sensitized solar cells have been greatly improved via morphology adjusting. This review summarizes the ZnO nanomaterials in the aspect of the single structure and hierarchical structure. It also discusses the recent research progress in dye/quantum dot sensitized solar cells fabricated from ZnO photoanode, and the further trends for improving ZnO nanomaterials based device performance are reviewed as well.
Research & Developmen
• Select
  Thermocapillary convection in Czochralski silicon growth by bidirectional temperature gradients under microgravity

  WEI Chengxingyun,PENG Lan, ZHANG Quanzhuang

  功能材料. 2016, 47(12): 12090-12096. https://doi.org/10.3969/j.issn.1001-9731.2016.12.014

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The bidirectional temperature gradients play an important part in the convection of crystal growth. However, most of the researches before only focused on unidirectional temperature. In this paper, under microgravity, a serious of numerical simulations was conducted to study the thermocapillary convection in Czochralski growth of silicon crystal. The coupling effects of vertical and horizontal temperature gradients were discussed. The radiation on the melt surface was considered, the range of horizontal and vertical temperature gradient were Ma=(0-3000) and Q=(1.39×10^-2-1.76×10^-2) respectively. Results show that flow is steady for small Q and Ma. In this case, there are three flow cells in the melt, the melt flow is dominated by Q; the flow is more stable due to the decrease of the Q and the increase of the Ma. When the Ma exceeds a threshold value, an unsteady three dimensional flow is developed. With the increase of the Q, the critical Ma significantly decreased. When the flow is unsteady, a new way of the flow pattern transtion is found. Ma is the key for the change of the surface fluctuation pattern. The number of the hydrothermal wave is changed by Q, and the generation of hydrothermal wave which is near the crystal is determined by Q. With the enhancement of the Q and Ma, the flow pattern enventually changes into curved spoke patterns.
• Select
  Thesurface construction by heparin-poly-l-ly-sine (Hep-PLL) nanoparticles

  TAN Jianying,LIU Tao,CHEN Junying,HUANG Nan

  功能材料. 2016, 47(12): 12097-12103. https://doi.org/10.3969/j.issn.1001-9731.2016.12.015

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The ideal biomaterials surface for the blood or vascular contacting should be hemocompatibility and endothelialization ability. This study focuses on improving the anti-coagulation and endothelial regeneration of 316L stainless steel (316L SS) surface by introduced VEGF-loaded heparin-poly-l-lysine (Hep-PLL) nanoparticles to its surface. The VEGF-loaded nanoparticles (NPV) were firstly constructed by electrostatic interactions. And the NPV were then immobilized on dopamine-coated 316L SS surface. The physicochemical properties of the modified surface were characterized by water contact angle assay, Alcian blue staining and toluidine blue O assay, etc. The adhesion behavior and morphology of platelets on the modified surfaces were evaluated by fluorescence staining and scanning electron microscope (SEM). The clotting time were tested by APTT. The endothelial cell growth behaviors were evaluated by fluorescent staining and Cell Counting Kit-8 (CCK-8). The results revealed that the NPV were successfully immobilized onto 316L SS surface. The introduction of the loaded-VEGF nanoparticles obviously increased the blood compatibility due to the less platelet adhesion compared to the 316L SS surface. The modified surface also provided favorable endothelial regeneration according to the endothelial cells adhesion, proliferation and its biological activity based the CCK-8 measurements. Meanwhile, the modified surface still exhibited exciting antithrombogenic properties after immersed in PBS solutions for 5 and 15 d. Our results indicated that the surface modification of loaded VEGF heparin-poly-l-ly-Sine (Hep-PLL) nanoparticles could be a promising strategy for cardiovascular contacting device.
• Select
  Thermal cycle effects on microstructures and mechanical properties of copper-clad aluminium bus bars

  WANG Bing,LIU Ping,LIU Xinkuan,WANG Ziyan,CHEN Xiaohong,LIU Xiaozhi

  功能材料. 2016, 47(12): 12104-12109. https://doi.org/10.3969/j.issn.1001-9731.2016.12.016

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The thermal cycle tests were conducted on copper-clad aluminium bus bars which were produced by the roll casting method with an independently developed device. To explore the effects of different thermal cycle temperatures and times on microstructures and mechanical properties of the interface,thermal cycle tests of 2000 cycles, 600 cycles and 100 cycles were performed at 200, 250 and 300 ℃ respectively. The bond strength was tested on electronic universal test machine ZWICK-Z050, the microstructures of interfaces were observed by scanning electron microscope (SEM) and polarizing microscope (PM), and the phases were determined by electro-probe microanalyzer (EPMA) and X-ray diffraction (XRD). The results indicated that at 200 ℃, the bond strength increased firstly and decreased lately while the width of the interface bonding layer decreased first and then increased with cycle times increasing. At 250 ℃ or 300 ℃, the bond strength decreased apparently and the width of the interface bonding layer increased obviously. The wider the bonding layer, the lower the bond strength. The intermediate compounds at the interface were mainly Al₂Cu, Cu₉Al₄ and CuAl. Cu₉Al₄ and CuAl phases were mainly on Cu side, and Al₂Cu phase was chiefly on Al side. Besides, the thermal cycle between 200 and 300 ℃ didn't change variety or quantity of the intermediate compounds.
• Select
  Synthesis and property study on negative thermal expansion ZrW₂O₈ thin film

  SUN Xiujuan, ZUO Fangyuan, JIAO Lei, CHENG Xiaonong,

  功能材料. 2016, 47(12): 12110-12113. https://doi.org/10.3969/j.issn.1001-9731.2016.12.017

  Abstract ( ) Download PDF ( ) Knowledge map Save

  ZrW₂O₈ thin film was synthesized using sol-gel method. The structure and morphology of the resulting film were characterized by Powder X-ray diffraction (XRD), Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) respectively. The results show that the films are single phase of α-ZrW₂O₈. The surface of ZrW₂O₈ thin film has small holes without obvious cracks. On the whole, the film is composed of rod-like particles, during which film is composed of small particles. The thickness of the film is about 500 nm. ZrW₂O₈ thin film is transparent in the visible region with two absorb peaks in the ultraviolet region, which are 348.3 and 277.2 nm respectively.
• Select
  Microstructural characterization of Sr_0.5Ba_0.5TiO₃/La_0.5Sr_0.5CoO₃ bi-layer

  WANG Mingguang, QI Yang

  功能材料. 2016, 47(12): 12114-12117. https://doi.org/10.3969/j.issn.1001-9731.2016.12.018

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The microstructure of Sr_0.5Ba_0.5TiO₃ films deposited on (001) LaAlO₃ substrate with La_0.5Sr_0.5CoO₃ as bottom electrode by pulsed laser deposition method was investigated by transmission electron microscopy. The results showed that La_0.5Sr_0.5CoO₃ layer was epitaxially grown on LaAlO₃ substrate with a cube-cube orientation relationship. A new oxygen-deficient ordering structure was formed due to structural deformation in La_0.5Sr_0.5CoO₃ film, which was different from its counterpart in bulk. The La_0.5Sr_0.5CoO₃ film was consists of numerous orientation domains, some defects such as stacking faults and anti-phase boundaries in the film were also identified. Sr_0.5Ba_0.5TiO₃ film with free oriented columnar polycrystalline was grown on La_0.5Sr_0.5CoO₃ layer at the growing temperature of 500 ℃, however, when the deposition temperature increased to 820 ℃, a perfect single-crystalline film of Sr_0.5Ba_0.5TiO₃ was obtained.
• Select
  Study on microstructure and mechanical properties of CrAlN/WS₂ nanomultilayered films

  LIU Jingjing, LI Wei, MENG Jia, LIU Ping, ZHANG Ke, MA Fengcang,

  功能材料. 2016, 47(12): 12118-12123. https://doi.org/10.3969/j.issn.1001-9731.2016.12.019

  Abstract ( ) Download PDF ( ) Knowledge map Save

  CrAlN/WS₂ nanomultilayered films with different modulation periods were synthesized on Si substrate by reactive magnetron sputtering. The influences of modulation periods on microstructure and mechanical properties were investigated by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), nano-indentation techniques and coating friction-wear testing machine,scanning electron microscope(SEM). The results indicated that, when WS₂ layer thickness was less than 0.8nm, hexagonal-structured WS₂ layers were forced to transform to B1-NaCl structure under the template effect of CrAlN layers and grew epitaxially with CrAlN layers, resulting in enhancement of mechanical properties. The maximum hardness and elastic modulus could respectively reach 37.3 and 341.2 GPa when WS₂ thickness was 0.8nm. With further increase of WS₂ layer thickness WS₂ layer could not keep fcc structure and transformed to hexagonal-structure, making epitaxial growth structure broken and leading to the decrease of hardness and elastic modulus. The friction coefficient of CrAlN/WS₂ nanomultilayered films was 0.2-0.3, much lower than that of monolithic CrAlN film, and the wear rate obviously decrease, suggesting that the insertions of WS₂ layers greatly improved the friction and wear resistance of CrAlN/WS₂ nanomultilayered films.
• Select
  Electrical conductivity study on phosphate cement-based carbon fiber composites

  YI Feng, DING Zhu, XIA Yuying

  功能材料. 2016, 47(12): 12124-12128. https://doi.org/10.3969/j.issn.1001-9731.2016.12.020

  Abstract ( ) Download PDF ( ) Knowledge map Save

  A comparative study on mechanical and electrical properties of both phosphate cement carbon fiber composites (PCFC) and carbon fiber reinforced cement composites (CFRC) were studied in this paper. The PCFC sample was prepared by using phosphate cement with high volume of fly ash as matrix, while the CFRC sample was prepared by using Portland cement as matrix. The same short cut carbon fiber was used in the both cement composites samples as the conductive components. The results showed that comparing with CFRC, PCFC has both higher electrical conductivity and mechanical properties, it is also easy to be prepared when they have same carbon fiber content. Mechanism analysis showed that there is a secondary percolation in PCFC samples, but there is no the phenomenon in CFRC. By SEM image analysis, the results showed the distribution of carbon fibers in PCFC is more uniform than that of CFRC when the both cement composites contain a high carbon fiber content. The aging time test results indictedd that when carbon fiber dosage is higher than 1.4wt%, aging time has a little effect on electrical conductivity of PCFC, which means it has an excellent stability in electrical property.
• Select
  Effects of CNT the content on electrochemical pr-operties of nature graphite anode materials

  DENG Lingfeng, PENG Huiyan, QIN Yukun, WU Yiqiang

  功能材料. 2016, 47(12): 12129-12133. https://doi.org/10.3969/j.issn.1001-9731.2016.12.021

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Carbon nanotube (CNT) were coated on the natural graphite by sol-gel method, which were to improve the properties of charging-discharging specific capacityity and cycle life. The influences of CNT content on electrochemical properties of nature graphite were investigated. The composite materials were characterized by SEM, XRD, and charge-discharge method. The results showed that CNT formed 3D conducting network structure.The crystal structure of natural graphite was retained. With the increase of the mass fraction of CNT, the electrochemical properties of composite material increased and then decreased. The CNT content of 7% had excellent performance. The initial discharge capacities of CNT/nature graphite are 427 mAh/g at 0.1 C,which are 20% higher than natural graphite(356 mAh/g). The capacity retention still had 93.6% after 100 cycles.
• Select
  The effect and mechanism of m(M)/m(P) ratio for the drying shrinkage of magnesium phosphate cement

  DAI Fengle, QI Zhaoqing, WANG Hongtao, JIANG Zichao,

  功能材料. 2016, 47(12): 12134-12138. https://doi.org/10.3969/j.issn.1001-9731.2016.12.022

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The effect of m(M)/m(P) ratio for the drying shrinkage and mechanism of magnesium phosphate cement was investigated by temperature recorder, Mercury mercury analyzer, X-ray diffractometer, scanning electron microscope and energy spectrometer. The results show that with the increase of m(M)/m(P) ratio, the expansion and drying shrinkage of magnesium phosphate cement decreases. The drying shrinkage of cement produced about hydrate 8 hours later, and tends to be stable at the age of 20 days. The increase of m(M)/m(P) ratio which lends to the decrease of the hydration temperature, the increase of the porosity, the decrease of MgKPO₄·6H₂O, and the looser structure of the hydration products will results in the decrease of drying shrinkage of magnesium phosphate cement.
• Select
  First-principles study of the effects of GaN∶Mn with N vacancy and Ga vacancy on electronic structures,ferromagnetism and optical properties

  JIANG Lianjiao,FU Silie,QIN Yingxing,LI Jianxiang

  功能材料. 2016, 47(12): 12139-12146. https://doi.org/10.3969/j.issn.1001-9731.2016.12.023

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The electronic structures and optical properties of Ga vacancy and N vacancy from the incorporation of Mn atoms doping as nearest neighbor,next nearest neighbor and far neighbor each of the three cases GaN systems were calculated by using plane wave ultra-soft pseudo-potential method based on density functional theory.This article analyzed and compared the effects of different positions of vacancies on the performance of magnetic properties of Mn doped GaN.The results indicate that the band gap becomes wider after Mn doped GaN,and it shows half metallic ferromagnetism.N vacancies enhance the ferromagnetism of Mn doped GaN systems and the total magnetic moment of the doped systems increases with the decrease of the N vacancy away from Mn impurity.However,Ga vacancies reduce the ferromagnetism of Mn doped GaN systems and the total magnetic moment of the doped systems decreases with the reduction of the Ga vacancy away from Mn impurity. Furthermore,the main absorption peaks and absorption edge move towards a lower energy region in all cases of vacancies of Mn doped systems,which shows a red shift phenomenon.
• Select
  Research on thermoelectric properties of semiconductor P-N type thermoelectric power generation device

  WANG Changhong,LI Na,LIN Tao,WU Haodong

  功能材料. 2016, 47(12): 12147-12151. https://doi.org/10.3969/j.issn.1001-9731.2016.12.024

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Ti₂Be₃ thermoelectric materials were prepared through zone melting method, the PN junction as the research object. The temperature and flow field of the model of the single semiconductor PN junction was simulated through finite volume method, and the heat transfer process was calculated through the thermal resistance analysis method, considering the influence of convection, heat conduction and radiation of the gas in the cavity of PN junctions on thermoelectric conversion process. Research results show that: the results of numerical simulation and thermal resistance analysis were consistent. The temperature diffrernce dissipation of the ceramic substrate thermal resistance reached to 46% in the chip heat transfe process, and when the temperature at the hot end was 1 000 K, radiation heat transfer accounts for 37% of the total heat transfer; So the optimization of semiconductor PN junction model and appropriate to reduce the thermal resistance of the ceramic substrate are conducive to improve the actual temperature difference and application value of semiconductor PN junction.
• Select
  Effects of microstructureof Cu thin films deposited by magnetron sputtering on electro-explosive performance

  HU Yunqin,QIU Linjun,DAI Bo,WEI Xianhua,REN Yong,GE Nina,LONG Zhen

  功能材料. 2016, 47(12): 12152-12156. https://doi.org/10.3969/j.issn.1001-9731.2016.12.025

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Copper (Cu) thin films were deposited by DC magnetron sputtering method. The structure, morphology and resistivity of the deposited Cu films have been examined with respect to the sputtering power and sputtering pressure. The exploding bridge foils were fabricated with photolithography, and their electro-explosive performances were studied by the test circuit. Both increasing sputtering power and decreasing sputtering pressure result in quicker deposition rate, larger grain size and lower resistivity of the deposited Cu films. Besides, the samples have higher crystalline orientation along the (111) direction with decreasing sputtering power and increasing sputtering pressure. Moreover, the Cu bridge foils with larger grain size have an earlier burst moment. Meanwhile, the bridge foils have higher peak current and peak power with higher Cu (111) preferred orientation.
• Select
  Effect ofNi microalloying on microstructure and electrochemical performance of nanoporous Cu

  WANG Ziyu, LIU Xuyan, PAN Deng

  功能材料. 2016, 47(12): 12157-12161. https://doi.org/10.3969/j.issn.1001-9731.2016.12.026

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Nanoporous Cu (NPC) was successfully prepared by chemical dealloying Cu-Al-Ni as-spun ribbons produced by induction melting and a single-roller melt-spinning method in dilute hydrochloric acid solution with high temperature water bath. The phase composition and the micro-morphology of the precursor and dealloyed ribbons were characterized by XRD and SEM. It was found that as-spun ribbon was consisted of tetragonal Al₂Cu and cubic Al₄Cu₉ phases. Ni addition was found to be effective in improving current density of electro-oxidation of methanol under alkaline conditions by decreasing bicontinuous structure pore size and distribution through the electrochemical tests. Using NPC prepared from (Cu₄₀Al₆₀)₉₅Ni₅ precursor alloy, the current density of electro-oxidation of methanol was improved by 3.5 times.
• Select
  Electrochemical properties of expanded graphite prepared by electrochemical method for Na-ion batteries

  LI Huan, CAO Xiaoyan,HAN Xiaoqi, WANG Wei

  功能材料. 2016, 47(12): 12162-12168. https://doi.org/10.3969/j.issn.1001-9731.2016.12.027

  Abstract ( ) Download PDF ( ) Knowledge map Save

  In order to investigate the properties for sodium-ion storage of expanded graphite, an expanded graphite was prepared by electrochemical method. The structure of the samples were characterized by X-ray diffraction (XRD) and the electrochemical behaviors were studied using galvanostatic charge/discharge test, cyclic voltammogram, and electrochemical impedance spectra. The results indicated that the modified flake graphite still kept the layer structure after electrochemical oxidation and expansion, while the average interlayer distance expanded slightly. Using diethylene glycol dimethyl ether (DEGDME) as the solvent, the capacity of sodium-ion insertion and extraction of the expanded graphite as well as the the rate performance and cycling behavior were improved significantly. A high reversible capacity of 110.9 mAh/g could be obtained at 700 mA/g, which was 66.8% of the capacity at 10 mA/g. After cycling over 100 charge/discharge cycles at 100 mA/g, the expanded graphite still maintained the high capacity of 154.8 mAh/g, with a capacity retention ration ratio of 114.8%. A study of potentiostatic intermittent titration technique(PITT) yield that the mean Na-ion diffusion coefficient, was 7.7×10^-8 cm²/s.
• Select
  Synthesis and characterization of P-phenylenediamine-aniline copolymer nanomaterials

  HOU Jingli, SHEN Yiding, WANG Haihua, FEI Guiqiang, HU Miaomiao, WANG Xue

  功能材料. 2016, 47(12): 12169-12172. https://doi.org/10.3969/j.issn.1001-9731.2016.12.028

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Polyaniline(PANI), Poly(p-phenylenediamine)(PPDA), P-phenylenediamine-aniline copolymer P(ANI-PDA) nanomaterials were synthesized in hydrochloric acid by chemical oxidation method using aniline, p-phenylenediamine as monomers, ammonium persulfate as oxidant and ammonia as de-dopant. The structure, crystallinity, thermal ability and morphology were characterized by FT-IR, XRD, UV, TGA and SEM. The dispensability was tested in aqueous water.The results showed that the quinoid structure in PPDA and P(ANI-PDA) was reduced compared with PANI. P-phenylenediamine-aniline copolymer exhibited the highest crystallinity and dispensability in aqueous water. polyaniline exhibited the best thermal stability. PANI displayed irregular porous particle agglomeration structure, whereas nanosheet structure was detected in the morphology of PPDA and P(ANI-PDA)and which can increase the crystallinity and dispensability of polymers.
• Select
  Activation of initial hydrogenation of magnesium by doping with sodium halide

  QIU Shujun, MA Xingyu, WANG Errui, HUANG Jianling, ZHANG Zhan,

  功能材料. 2016, 47(12): 12173-12177. https://doi.org/10.3969/j.issn.1001-9731.2016.12.029

  Abstract ( ) Download PDF ( ) Knowledge map Save

  As one of most potential materials for storing hydrogen, it needs a long time to activate magnesium (i.e., incubation period) before its initial hydrogen absorption due to the formation of magnesium oxide. In order to eliminate the incubation period, alkaline metal chlorides (NaCl and NaBr) were doped into magnesium by high energy ball milling (HEBM). It is found that at 2 000 kPa hydrogen pressure, Mg-NaCl and Mg-NaBr could absorb 5.6 and 5.0wt% hydrogen without an incubation period observed at 573 and 608 K, respectively. This indicates that doping with alkaline metal chlorides by HEBM could give rise to an enhancement of the kinetics for the initial hydrogenation of magnesium, whereas it has little effect on the alteration of the thermodynamics.
• Select
  Study on reinforcing of graphene oxide to microcapsule phase change materials of polystyrene/butyl stearate

  GUO Junhong,ZHANG Pengzhong,MU Bo,SHAO Jingyao,YANG Baoping,CUI Jinfeng

  功能材料. 2016, 47(12): 12178-12183. https://doi.org/10.3969/j.issn.1001-9731.2016.12.030

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Modified graphene oxide (MGO) was obtained by using graphene oxide (GO) modified with the γ-methyl-propylene (KH-570). Microcapsule phase change materials of polystyrene/butyl stearate (MGO-MicroPCMs), reinforced by graphene oxide, was prepared by the seeded micro-suspension polymerization using the MGO and styrene monomer composites as wall material, n-Butyl stearate as core material. The chemical compositions, microstructure, thermal stability and mechanical properties of MGO-MicroPCMs were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), contact angle tester, particle size analyzer, differential scanning calorimeter (DSC), thermogravimetric analyzer (TG) and nano-indenter. The results showed that MGO-MicroPCMs was a spherical structure with uniform distribution. With the increase of MGO content, the average particle diameter of the microcapsules was reduced, the sealing property of microcapsules increased, permeability decreased 32.17% when the content of MGO was 0.6wt%, the hardness increased from 5.83 to 11.79 MPa, the thermal stability and hydrophilicity were also improved obviously.
• Select
  Synthesis andphotocatalytic properties of cactus-like heterostructure of Ag₃PO₄ MC/ZnO NRs

  YANG Xin, JIANG Bingxin, ZHU Liguo

  功能材料. 2016, 47(12): 12184-12188. https://doi.org/10.3969/j.issn.1001-9731.2016.12.031

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Heterostructure of Ag₃PO₄ microcube (MC)/ZnO nanorobs(NRs) were fabricated via a heteroepitaxial growth strategy. As-prepared Ag₃PO₄ MC/ZnO NRs was cactus-like. Scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) was used to characterize the morphology of the samples, the X-ray diffraction (XRD) was used to characterize the crystal structure, and the photocatalytic properties and stability were studied with degradation of Rhodamine B (RhB) under visible light irradiation. The experimental results showed that Ag₃PO₄ MC/ZnO NR heterostructures exhibited superior photocatalytic activity toward degradation of RhB under visible light irradiation. The degradation rate was about 98%. The enhanced catalytic performance was owned to the hetero-structured catalyst which supplied more active sites, meanwhile improved the efficient separation of photo-excited electron-hole pairs.
• Select
  Effect of W element on corrosion resistance of CrWMn iron-based cladding layer in liquid lead bismuth eutectic by TIG

  HUANG Fei,LEI Yucheng,ZHANG Xin,LIU Faqiang,ZHU Qiang

  功能材料. 2016, 47(12): 12189-12194. https://doi.org/10.3969/j.issn.1001-9731.2016.12.032

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The corrosion and wear resistance of CrWMn iron-based cladding layer in dynamic lead bismuth eutectic (LBE) at 550 ℃ and the effect of tungsten compound was researched in this paper. Four samples were placed at the location where the velocity was equal. After test, obvious corrosion, dissolution of components and a little PbBi penetration is observed on the surface of four samples. A double layer oxide film which consists of a loose and porous Fe₃O₄ outer layer and a dense FeCr₂O₄ and (Fe_0.6Cr_0.4)₂O₃ inner layer forms and contains a little tungsten compound. When the content of WC is between 3.73% and 5.33%, the microhardness of the cladding layer is the highest, and the thickness of the outer layer becomes bigger while that of the inner layer decreases, and the corrosion and wear is relatively less. Moderate tungsten compound could distinctly increase corrosion and wear resistance of the cladding layer and protect the surface of cast 316L components well.
• Select
  Research on the performance of graphene coated silicon composite synthesized by microwave method

  WANG Lizhen, LIU Jingjie, FANG Hua,GAO Haili

  功能材料. 2016, 47(12): 12195-12201. https://doi.org/10.3969/j.issn.1001-9731.2016.12.033

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The graphene coated silicon composite (Si/RGO) was synthesized by microwave method. The structure, morphology and electrochemical performances of the as-prepared samples were studied by methods of XRD, Raman, FT-IR, TEM, cyclic voltammetry, galvanostatic charge-discharge and AC impedance. The XRD, Raman and FT-IR results showed that graphene oxide was reduced tographenewith low graphitization degree and disordered increased. The TEM images indicated that the nano silicon was evenly coated with graphene, with thickness of about 4 nm. Charge and discharge results show that graphene coated silicon samples showed high specific capacity, goodrate performance and cycle stability. The initial discharge specific capacity and the coulomb efficiency was 1 747 mAh/g and 67.4%.The power conversion efficiency was increased to 98% after 3 cycles at a current density of 400 mA/g. After 100 cycles at 400 mA/g, the reversible specific capacity retained 1 175 mAh/g.
• Select
  The effect of the solution viscosity on the microstructure and superconducting properties of the SmBa₂Cu₃O_7-x films

  WANG Zhen, WANG Wentao, ZHANG Xin,LEI Ming,WANG Mingjiang,ZHAO Yong

  功能材料. 2016, 47(12): 12202-12205. https://doi.org/10.3969/j.issn.1001-9731.2016.12.034

  Abstract ( ) Download PDF ( ) Knowledge map Save

  SmBCO superconducting films were deposited on (00l) LaAlO₃ single crystal substrate by self-developed fluorine-free chemical solution deposition approach. The effect of the solution viscosity on the texture, microstructure and superconducting properties of the films were investigated. In this work, the solution viscosity was adjusted by changing the amount of polymers in the precursor solution. The results indicate that SmBCO films with different viscosities show good c-axis texture of the grains. And the film with 4% polymer addition in the precursor solution has much smoother and denser surface morphologies, showing the good grains connectivity. In addition, this film has a high T_C of 89.5 K and J_c (65 K, self-field) above 1 MA/cm², illustrating better superconductivity.
• Select
  Influence of fatigue loading factors on adhesion properties of rubber-steel wire complexes

  LI Li, LIU Xiaodong,XIAO Peiguang, WANG Jiangzhong

  功能材料. 2016, 47(12): 12206-12211. https://doi.org/10.3969/j.issn.1001-9731.2016.12.035

  Abstract ( ) Download PDF ( ) Knowledge map Save

  In order to explore the influence of fatigue loading on the adhesive properties of rubber-steel wire complexes. In this paper, dynamic and static measurement methods are integrated using to research the influence of these items on the adhesive properties of rubber-steel wire complexes,which items contain fatigue frequency,fatigue loading times and storage time after dynamic fatigue measurement. The results show that the tensile elongation of sample at fracture shows obviously decreased with the increasing of fatigue frequency. The extraction force of rubber-steel wire complexes sample shows a variation tendency of firstly increases and then decreases with the increase of fatigue imposed times.In addition,the steel cord surface adhesive amount shows a variation tendency of firstly increases and then decreases with the increase of fatigue imposed times. The adhesion force also has a variation tendency of firstly increases and then decreases with the increasing of storage time,and the recovery of adhesion force after fatigue imposed mainly occurred in the initial stage of storage time.
• Select
  Preparation andproperties of addition type nano-ZrO₂/silanehybrid films with high refractive index

  ZHONG Minhua, HANG Jianzhong, SUN Xiaoying, JIN Lujiang, SHI Liyi, CHEN Wei

  功能材料. 2016, 47(12): 12212-12216. https://doi.org/10.3969/j.issn.1001-9731.2016.12.036

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Nano-ZrO₂/vinyl silane hybrid resins were obtained via sol-gel condensation among dimethoxymethylvinylsilane(MVDMS), diphenyldimethoxysilane(DPS)and zirconium n-butoxide dispersed in isopropanol. And the synthesized nano-ZrO₂/vinyl silane hybrid resins were thermally cured by hydrosilylation with phenyl hydro-silicone fluid in the presence of a Pt catalyst,addition type nano-ZrO₂/silane hybrid films were synthesized. The effects of ZrO₂ content on transmittance, refractive index and thermal stability of the films were studied. The results indicated that transmittance in visible range of all films was above 99%;refractive indices of the films were tunable between 1.583-1.628;TGA test showed that the thermal stability of the hybrid films decreased with the ZrO₂ content. And the zirconia with a particle size under 15 nm was uniformly dispersed in the silica resin without observable agglomerates as the TEM image exhibited. In addition,the LED encapsulation reslut showed that the light extraction efficiency can be increased to 125.1% with 30% mole content zirconia doped hybrids encapsulation.
• Select
  CeO₂ coated rutile TiO₂ and weatherability

  CHEN Long, HOU Qinglin, DUAN Haiting, WANG Jingwen, HOU Yihui

  功能材料. 2016, 47(12): 12217-12221. https://doi.org/10.3969/j.issn.1001-9731.2016.12.037

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The CeO₂-coated rutile TiO₂ were prepared by sol-gel method. The influence of oxygen, microstructure, amount of surface coating and cerium, silicon and zirconium inorganic oxide on rutile TiO₂ weatherability were studied by rhodamine b ultraviolet aging test method. The results showed that dense and uniform cerium oxide surface coating can improve the rutile TiO₂ weatherability and cut off contact with the oxygen around; rutile TiO₂ coated 3% cerium oxide have the best weatherability; cerium oxide can better improve the rutile TiO₂ weatherability than silicon and zirconium inorganic oxide.
• Select
  Preparation and properties of AZO@TiO₂ nanowhisker

  MA Hui, GAO Qiang, LIU Weihua, LIU Wanwan, GE Mingqiao

  功能材料. 2016, 47(12): 12222-12226. https://doi.org/10.3969/j.issn.1001-9731.2016.12.038

  Abstract ( ) Download PDF ( ) Knowledge map Save

  In recent decades, electroconductive nanowhisker as the conductive filler material has developed into a kind of nanomaterials with the property of antistatic targeting. Among them, the electroconductive nanowhisker with fine conductivity, light weight and environment friendly has aroused extensive concerns. Co-precipitation method was conducted to prepare a layer of AZO conductive coating on the surface of TiO₂nanowhiskers. The four probe tester, Scanning electron microscopy (SEM) and UV spectrophotometer were employed to test the nanowhiskers and fabrics. The results showed that AZO@TiO₂ nanowhiskers revealed both effective electric conductivity and anti-UV property.
• Select
  Effect of MgO addition on thermal conductivity of Gd₂Ce₂O₇

  SHAN Chunyang, CHEN Xiaoge, ZHANG Hongsong, REN Bo,
  TANG An, DANG Xudan

  功能材料. 2016, 47(12): 12227-12229. https://doi.org/10.3969/j.issn.1001-9731.2016.12.039

  Abstract ( ) Knowledge map Save

  Using Gd₂O₃, MgO and Ce(NO₃)·6H₂O as reactants, (Gd_1-xMg_x)₂Ce₂O_7-x/2 solid solutions were prepared by Sol-gel method. Their phase structure was analyzed by X-diffraction, their microstructure was observed by scanning electronic microscope, and their thermal diffusivities were measured by laser-flashing method. Results show that pure (Gd_1-xMg_x)₂Ce₂O_7-x/2 ceramics with fluorite structure are synthesized successfully, the dense bulk samples have dense microstructure and clean grain boundaries. The new produced oxygen vacancies results in the lowest thermal conductivity of (Gd_0.95Mg_0.05)₂Ce₂O_6.95 solid solution. The (Gd_1-xMg_x)₂Ce₂O_7-x/2 solid solutions can be used as ceramic materials for thermal barrier coatings
Process& Technology
• Select
  Synthesis and characterization of tourmaline methacylate-vinyl acetate copolymer

  LI Mengcan, HU Yingmo, LI Yunhua, HOU Chunyan, LIU Quan, LIU Yuhang

  功能材料. 2016, 47(12): 12230-12234. https://doi.org/10.3969/j.issn.1001-9731.2016.12.040

  Abstract ( ) Download PDF ( ) Knowledge map Save

  In order to synthesize the tourmaline-containing functional copolymer, tourmaline methacylate was prepared by means of the surface organic modification of tourmaline powder with methacrylic anhydride, and then copolymerized with vinyl acetate to get a tourmaline methacylate-vinyl acetate copolymer, and the structures of tourmaline methacylate and its copolymer were characterized via IR, XRD and SEM. Experimental results show that tourmaline powder was successfully introduced into the copolymer, and exhibited an excellent dispersion in copolymer and storage stability. And the membrane of methacylate-vinyl acetate copolymer revealed a good mechanical properties and excellent negative ion release, far infrared radiation performances.
• Select
  Synthesis of controllable multi-layer graphene by MPEE-CVD

  CHEN Xinyao, TIAN Bo, CAI Weiwei

  功能材料. 2016, 47(12): 12235-12239. https://doi.org/10.3969/j.issn.1001-9731.2016.12.041

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Graphene is a promising advanced 2 dimensions material for broad applications in many fields. However, synthesis of high quality, multi-layer graphene is still challenging. In this paper, by using commercial microwave, we demonstrate a method of microwave plasma enhanced chemical vapor deposition (MPEE-CVD) to synthesis multi-layer graphene.
• Select
  Preparation of three-layered membrane for antimicrobial and alveolar bone regeneration

  ZHANG Liang,TAN Minghao,YANG Fanwen,ZHU Jixiang,TIAN Xiumei,CHEN Xiaoming

  功能材料. 2016, 47(12): 12240-12245. https://doi.org/10.3969/j.issn.1001-9731.2016.12.042

  Abstract ( ) Download PDF ( ) Knowledge map Save

  This paper design a multifunctional alveolar bone regeneration membrane. Preparation the three-layered membrane by solution spreading and electrospinning. The microstructure observation was carried out by scanning electron microscopy (SEM); the three-layered structure demonstrated higher strength (6.5 MPa); the drug release showed sustainable 3 d time. The results testified that it is promising for use in alveolar bone regeneration.
• Select
  Research on fabrication and property of NiMn₂O₄ coatingsfor Fe-Cr alloy interconnect applications

  ZHANG Yong, CHAI Hanghang, ZHI Long, ZHAO Zhiyu, PU Jian, XING Yazhe

  功能材料. 2016, 47(12): 12246-12249. https://doi.org/10.3969/j.issn.1001-9731.2016.12.043

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Fe-Cr ferritic stainless steels are the prospective interconnect materials used for intermediate temperature solid oxide fuel cells (IT-SOFCs). However, the efficient and safe operation of SOFC stacks is still limited due to poor oxidation-resistance of Fe-Cr ferritic stainless steels at high temperatures. In present work, NiMn₂O₄ coating was initially prepared as the protective coating materials for pre-oxidized Fe-Cr interconnect by traditional Sol-gel dip-coating method. The effect of coating on microstructure, oxidation-resistance and electrical behavior of Fe-Cr interconnect at high temperature was investigated. The results revealed that a relatively dense, uniform and well adherent NiMn₂O₄ coating was successfully prepared on the surface of pre-oxidized Fe-Cr alloy interconnect using Sol-gel dip-coating method. After oxidation at 800 ℃ for 168 h, the high temperature oxidation rate of NiMn₂O₄-coated Fe-Cr interconnect was only 1/3 of the uncoated one. In addition, the coated interconnect showed a lower and more stable area specific resistance of 10 mΩ·cm² as compared with that of uncoated interconnect.
• Select
  The influence of dispersant on microstructure and electrical properties of PZTS - SZTS piezoelectric ceramics

  CHENG Cheng,PENG Guigui,ZHENG Deyi,ZHANG Hao,HU Shunmin,ZHANG Jing

  功能材料. 2016, 47(12): 12250-12254. https://doi.org/10.3969/j.issn.1001-9731.2016.12.044

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The influence of dispersant on microstructure and electrical properties of Pb_0.88Sr_0.12Zr_0.54Ti_0.44Sb_0.02O₃ was investigated. Ammonium citrate was added during ball milling. XRD and SEM of the ceramics were employed to study the crystal structure and morphograghy, respectively. The results show that the single perovskite phase and the morphotropic phase boundary was obtained after adding ammonium citrate. The fluctuation of dielectric and piezoelectric properties was showed for the samples with different amount of ammonium citrate. Pb_0.88Sr_0.12Zr_0.54Ti_0.44Sb_0.02O₃'s comprehensive performance was enhanced for adding ammonium citrate. The piezoelectric constant(d₃₃) 597.75 pC/N,the dielectric constant(ε) 3343.83,the electromechanical coupling coefficient (K_p) 0.662 and the dielectric loss (tanδ) 2.09% were obtained for the sample with 5% dispersant.
• Select
  Preparation and photocatalytic properties ofhydrotalcite- like Li/Al-LDHs

  KONG Tingting, ZHANG Yingping, ZHANG Yagang, ZHOU Anning,

  功能材料. 2016, 47(12): 12255-12260. https://doi.org/10.3969/j.issn.1001-9731.2016.12.045

  Abstract ( ) Download PDF ( ) Knowledge map Save

  CO₂(Carbon dioxide) is the main greenhouse gases. The capture and photocatalysis is considered to be one of the effective approaches for reducing carbon dioxide emission. So, the preparation of CO₂ adsorption and photocatalysis materials is being a research hot spot, which is of high efficiency and low enregy consumption. A series of Hydrotalcite like Li/Al-LDHs catalytic materials were prepared by coprecipitation method and characterized by atoimc absorption spectrophotometer (AAS), X ray diffraction (XRD), scanning electron microscopy (SEM), thermal gravimetric analysis (TG) and ultraviolet visible spectrophotometer (UV), etc. The influence of preparation condition(contain ph and water bath time) and adding Ti⁴⁺ on the structure, morphology and CO₂ photocatalytic properties of LDHs was discussed. The results showed that, the Li₃Al₁-LDHs displays the highest crystallinity when the ph in 7-8 and water bath time for 36 h. Meanwhile, all the moles ratios of Li/Al-LDHs were photocatalytic activities. The photocatalytic activity and the productivity of CH₄ were improved of Ti₁Li₃Al₁-LDHs obtained by adding Ti⁴⁺.