30 May 2019, Volume 50 Issue 5

    

• Select all
  |

Focuses & Concerns (The Project of Chongqing Press Fund in 2018)
• Select
  Enhanced photoelectric response of Ni-doped ZnO nanorod film prepared by hydrothermal method under UV illumination

  JIANG Xiaotong, LU Linzhi, XIE Changsheng

  Journal of Functional Materials. 2019, 50(5): 5001-5005. https://doi.org/10.3969/j.issn.1001-9731.2019.05.001

  Abstract ( ) Download PDF ( ) Knowledge map Save

  In this paper, Ni-doped ZnO nanorod arrays with different concentrations were synthesized by hydrothermal method using nickel acetate as Ni source. The structure of doped ZnO nanorod arrays was characterized by XRD, PL and XPS, and the photoconductivity was tested by self-made photoelectric performance platform. The results show that the doping of Ni changed the lattice constant of ZnO. The photoresponse of doped ZnO nanorod array films was very high. Among them, the photoresponse of ZnO nanorod array films with nickel acetate concentration of0.05 mol/L was the highest, reaching 3 112.1, which was 38 times higher than that of pure ZnO nanorod array films. The doping of Ni broadened the depletion layer width of ZnO nanorods, reduced dark conductance and increased the photoresponse.
• Select
  Electrocatalytic behaviors of bifunctional oxygen catalyst Sr_1-xSm_xCoO₃ (x=0-0.6)

  WANG Zhouhang, MIAO He, LIN Peijian, CHEN Bin, WU Xuyang, LI Qingfeng, YUAN Jinliang

  Journal of Functional Materials. 2019, 50(5): 5006-5011. https://doi.org/10.3969/j.issn.1001-9731.2019.05.002

  Abstract ( ) Download PDF ( ) Knowledge map Save

  In recent years, reversible fuel cells (RFCs) have attracted much attention due to their high efficiency and environmental friendliness. However, the further development of RFCs is severely hindered by bifunctional oxygen catalysts. As a promising bifunctional oxygen catalyst, cobalt-based perovskites become a research hotspot in this field. However, its oxygen catalytic activity and stability still need to be further improved. In this paper, a series of Sr_1-xSm_xCoO₃ (SSC, x=0-0.6) oxygen catalysts were prepared by a modified sol-gel method and their oxygen catalytic activity and stability were studied. The results showed that samarium ion doping could effectively improve the bifunctional oxygen catalytic activities of SrCoO₃ perovskite. Among them, Sr_0.7Sm_0.3CoO₃ (SSC-30) had the highest oxygen reduction reaction (ORR) catalytic activity, and its onset potential and half-wave potential could reach 0.798 V and 0.638 V(vs RHE). Sr_0.8Sm_0.2CoO₃ (SSC-20) had the highest oxygen evolution reaction (OER) catalytic activity and its potential and corresponding overpotential η could respectively reach 1.692 V and 462 mV at a current density of 10 mA/cm². Based on the results of ORR and OER catalytic activities, SSC-30 had the best bifunctional oxygen catalytic activity and the potential difference ΔE between OER and ORR was only 1.071 V. In addition, Sm-doping could further improve the oxygen catalytic stability of SrCoO₃, and its catalytic stability toward ORR and OER of SSC-30 was much higher than that of SrCoO₃. The results of this paper can give guidance for the development and application of bifunctional cobalt-based perovskites.
• Select
  Progress on preparation and application of nanofluids with high thermal conductivity

  XU Ying, WANG Weiwang, HUANG Yunyun, HONG Ruoyu

  Journal of Functional Materials. 2019, 50(5): 5012-5017. https://doi.org/10.3969/j.issn.1001-9731.2019.05.003

  Abstract ( ) Download PDF ( ) Knowledge map Save

  As time goes on, the heat transfer performance of traditional pure liquids shows obvious weakness, and the nanofluids with high thermal conductivity have gradually attracted more attention. The developments of nanotechnology and nanofluids were reviewed. The preparation methods and performances of nanofluids, especially the performances of stability and thermal conductivity, were discussed. The potential of nanofluids in heat transfer field was emphasized under a brief introduction for their applications in several industries. Moreover, the current problems and development direction of nanofluids with high thermal conductivity were pointed out.
• Select
  Influence of heat treatment process on the high frequency soft magnetic properties of Fe_75.5Si_12.9B₇Cu₁Nb_1.8V_1.4Co_0.4 nanocrystalline alloy

  ZENG Yuting, GAN Zhanghua, WU Chuandong, NI Ming, LIU Jing, LU Zhihong, CHEN Yufeng, ZHU Zhaofeng

  Journal of Functional Materials. 2019, 50(5): 5018-5022. https://doi.org/10.3969/j.issn.1001-9731.2019.05.004

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The Fe_75.5Si_12.9B₇Cu₁Nb_1.8V_1.4Co_0.4 amorphous alloy ribbon was prepared by single-roller melting spin-quenching process. The effects of crystallization holding time (t), final annealing temperature (T_a) and transverse magnetic field strength (H) on the high frequency soft magnetic properties of nanocrystalline alloys were analyzed in the current paper. The results indicate that the highest effective magnetic permeability (μ_e), the lowest P_5/20k (the iron loss under frequency (f) of 20 kHz, flux density (B) of 0.5 T) and the lowest coercivity H_c (f＜100 kHz) could be obtained while T_a=550 ℃, t=150 min,while f=1 kHz, μ_e,H_c and P_5/20k were 80 900, 3.17 A/m and 37.64 W/kg, respectively. The normal annealing of the nanocrystalline alloys were performed in vacuum at the various T_a ranged from 530 to 610 ℃, the lower P_5/20k value of 37.64 and 35.28 W/kg could be achieved at 550 and 610 ℃, respectively. For a specific T_a, the P_5/20K decreased initially and then increased with increasing the direct current I. For a particular I, the relatively lower P_5/20K of nanocrystalline alloys could be achieved at 550 and 610 ℃. As a result, the optimum high frequency soft magnetic properties (P_5/20K=20.26 W/kg, B_r=0.3 T) of nanocrystalline alloy were obtained while T_a, t and I were 610 ℃, 150 min and 40 A, respectively.
• Select
  Study on phase change slurry performance test of adding nanoparticles and dispersants

  CHEN Hongbing, GONG Yutong, YAO Huaning, ZHANG Xiaokun, LI Siqi, WANG Congcong

  Journal of Functional Materials. 2019, 50(5): 5023-5027. https://doi.org/10.3969/j.issn.1001-9731.2019.05.005

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Combined with solar low-temperature heat collecting and heat storage, based on the selected hydrocarbon phase-change slurry, the suitable nano-particles (TiO₂) and dispersants (SDBS) were selected by thermal property and stability test, and the effect of particle size and dispersant mass fraction on the thermal properties and stability of phase change slurry was analyzed. The results show that the larger the mass fraction of nanoparticles, the larger the particle size and the worse the thermal properties and dynamic stability of phase change slurry. And the mass fraction of dispersant had little effect on the dynamic stability of phase change slurry. 20 nm TiO₂ nanoparticles with a mass fraction of 0.1% and SDBS dispersant with a mass fraction of 0.1% were added to the hydrocarbon phase change slurry, respectively, which had the best thermal properties and stability.
Review & Advance
• Select
  Analysis on the technology route and policies of advance materials used in major technical equipment

  CHEN Da, YANG Xiaoliang, ZHAO Anzhong, TANG Rui, TAN Jun

  Journal of Functional Materials. 2019, 50(5): 5028-5032. https://doi.org/10.3969/j.issn.1001-9731.2019.05.006

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Advance materials are the critical support to major technical equipment such as nuclear island equipment, aircraft engine and gas turbine etc. Currently, major countries in the world paid high attention and made strategies and plans to the development of advanced materials industries. This paper studies the policies, strategies and plans of developing advanced materials industries in main countries of the world, and puts forward some suggestions for developing advanced materials industries.
• Select
  Research progress of visible-light response photocatalysts for organic pollutant degradation

  WEI Haitang, ZHANG Dongming, LYU Tianping, ZHANG Genlin, LIU Qingju

  Journal of Functional Materials. 2019, 50(5): 5033-5041. https://doi.org/10.3969/j.issn.1001-9731.2019.05.007

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Photodegradation of aqueous organic pollutants is a very promising strategy to address environmental issues and energy problems. In this paper, the latest research progress of photocatalytic degradation of organic pollutants in recent years was introduced, focusing on titanate photocatalyst, tantalum photocatalyst, niobate photocatalyst, inorganic layered compounds, metal sulfides, and Z-type photocatalytic reaction system. The problems and feasible solutions of degradation of organic pollutants by metal chalcogenide catalysts were summarized, and the future research work on visible light photocatalytic degradation of organic pollutants was prospected.
• Select
  Advances in the formation, identification and biological effects of crowns on nanoparticles

  ZHANG Changping, ZHANG Yuhao, MA Liang, SONG Erqun, SONG Yang

  Journal of Functional Materials. 2019, 50(5): 5042-5047. https://doi.org/10.3969/j.issn.1001-9731.2019.05.008

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The understanding of the interactions of nanosized materials with living organism has developed rapidly. Nanoparticles can readily pass through various cell layers, cell fluids, and finally enter into the blood stream. Nanoparticles in contact with biological fluids are rapidly covered by a selected group of biomolecules to form a corona that interacts with biological systems. It has an important influence on the biological effects of nanoparticles. Here, we review the basic concept of the nanoparticle corona, and its formation mechanisms and factors that regulate corona formation. We summarize the current analytical methods and characterization techniques for corona. Finally, the effect of protein corona on biological effects were discussed. Studying highlight the properties of protein corona on its biological impacts may provide a deeper understanding of the molecular effects of nanoparticles in the human body, as well as regulate and enhance the functional application of nanomaterials by surface modification of nanoparticles.
• Select
  Research progress on copper and silver bonding wires for microelectronic packaging technology

  LIANG Shuang, HUANG Fuxiang, PENG Cheng, ZHONG Mingjun, WU Baoan, TANG Huiyi

  Journal of Functional Materials. 2019, 50(5): 5048-5053. https://doi.org/10.3969/j.issn.1001-9731.2019.05.009

  Abstract ( ) Download PDF ( ) Knowledge map Save

  With the development of high density, high speed and miniaturization in the electronic packaging industry, the gold bonding wire cannot meet the requirements due to cost and performance. Copper and silver bonding wires, which are cheaper, are gradually becoming a substitute for gold wire, but copper wires have problems, such as high hardness, easy oxidation, complicated process, etc. Silver wires have low tensile strength, Ag migration and poor high temperature oxidation resistance. In view of the above problems, the majority of scholars have carried out analysis and research. In this paper, the performance characteristics, composition design, preparation process, reliability research and performance improvement methods of copper and silver bonding wires according to related literatures, patents and products were reviewed and its development prospects were prospected.
• Select
  Recent advances on aerogels for indoor air pollutant removal

  KONG Yong, ZHANG Jiayue, SHEN Xiaodong

  Journal of Functional Materials. 2019, 50(5): 5054-5063. https://doi.org/10.3969/j.issn.1001-9731.2019.05.010

  Abstract ( ) Download PDF ( ) Knowledge map Save

  As special nanoporous materials with consecutive 3D network, aerogels have many unique properties, such as low density, high surface area, large pore volume and porosity, leading to their high performances and promising applications in aerospace, military, industrial production, green building, new energy and biological medicine, etc. Large porosity and penetrating nanopore of aerogels provide good gas diffusion capacity and enough space for the retention of adsorbates, high specific surface area of aerogels favours the gas-phase interaction. Therefore, aerogels are ideal mediums for the removal of indoor air pollutants, such as airborne particles, VOCs, formaldehyde and CO₂. In this paper, recent advances on the removal of these indoor air pollutants using aerogels were reviewed.
• Select
  A scientometric review of research focusing on coral aggregate concrete

  YOU Weiguo, XU Yidong, ZOU Yisong, CHEN Jiangang, LU Lei, ZHANG Guojun

  Journal of Functional Materials. 2019, 50(5): 5064-5071. https://doi.org/10.3969/j.issn.1001-9731.2019.05.011

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Coral concrete with coral crumbs as coarse aggregate and coral sand as fine aggregates plays a huge role in solving the shortage of materials in the construction of distant island reefs. This paper began with a scientific measurement analysis of mainstream journals, keywords, scholars and institutions active in coral aggregate concrete research. Then the problems of preparation, mechanical properties, durability and microstructure of coral concrete were summarized, and the shortcomings of coral concrete research were proposed.
• Select
  Syntheses and modifications of late transition-metal oxides based on chemical energy storage applications

  WANG Yuan, HAN Kai, YI Xiaoyi

  Journal of Functional Materials. 2019, 50(5): 5072-5082. https://doi.org/10.3969/j.issn.1001-9731.2019.05.012

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Energy storage technology is important to solve the shortage of fossil energy. Chemical energy storage has the incomparable advantages of less environmental pollution, convenient usage and no geographical restrictions, therefore it has received extensive attentions in recent years both in academia and industry. The developments of environmentally friendly high-activity electrode materials with high specific capacity, good cycle stability and low cost are currently top priorities for chemical energy storage. In this review, the syntheses and modifications of late transition-metal oxide electrode materials used in chemical energy storage devices in recent three years were summarized.
Research & Development
• Select
  Preparation and high temperature mechanical property of porous FeAl(Si) material

  GAN Qingzhan, XIE Wei, GAO Haiyan, FENG Luli, HE Yuehui

  Journal of Functional Materials. 2019, 50(5): 5083-5089. https://doi.org/10.3969/j.issn.1001-9731.2019.05.013

  Abstract ( ) Download PDF ( ) Knowledge map Save

  FeAl(Si) porous material was prepared by powder metallurgy method by partial diffusion/reaction sintering with Fe, Al and Si element powders as raw materials. The pore structure, microstructure and high temperature mechanical properties of FeAl(Si) porous material were investigated by XRD, SEM, EDS, porous performance tester and heat-strength tensile testing machine. The results show that the number of pores and pore size increased significantly with the increasing temperature. The pores were rounded and evenly distributed after sintering, and a single FeAl(Si) phase was obtained after sintering at 1 120 ℃. The open porosity of the prepared FeAl(Si) porous material was 51.0%, the maximum pore size was 27.3 μm, and the air permeability was 373.7 m³/(h·kPa·m²). The high temperature mechanical properties of the FeAl(Si) porous material increased first and then decreased with temperature increasing gradually from room temperature. When the temperature was 500 ℃, the FeAl(Si) porous material exhibited the maximum tensile strength of 15.24 MPa. While further increasing the temperature, the tensile strength decreased sharply. By studying the morphologies of the fractures surfaces, it was brittle fracture at low temperatures and plastic fracture at high temperatures.
• Select
  Numerical investigation of the effect of ply orientation on the mechanical characteristics of a composite wing

  DING Yongle, SONG Baowei, WANG Peng

  Journal of Functional Materials. 2019, 50(5): 5090-5094. https://doi.org/10.3969/j.issn.1001-9731.2019.05.014

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Composite materials, such as CFRP, are used as smart materials in underwater structures for its bend-twist coupling properties. In this paper, the CFD/FEM coupling fluid-structure method was used to investigate relationship between the ply orientation and the bend-twist coupling and the drag reduction properties. The results show that influence of ply orientation on the composite wing mechanical properties was negligible with small attack angle and significant with large attack angle. Appropriate ply orientation could effectively reduce drag force. The stress concentration area was consistent with ply orientation direction.
• Select
  Study on magnetocaloric effect of Fe₂₅Co₂₅Ni₂₅Cr₅P₁₀B₁₀ high entropy bulk amorphous alloy

  WU Kenan, LIU Cong, LI Qiang, HUO Juntao, SUN Yanfei

  Journal of Functional Materials. 2019, 50(5): 5095-5098. https://doi.org/10.3969/j.issn.1001-9731.2019.05.015

  Abstract ( ) Download PDF ( ) Knowledge map Save

  In this work, Fe₂₅Co₂₅Ni₂₅Cr₅P₁₀B₁₀ High-entropy bulk metallic glasses (HE-BMGs) with a maximum diameter of 1.2 mm were prepared by combination of fluxing treatment and J-quenching technique. Its magnetocaloric effect (MEC) has been investigated and the effect of high entropy on the magnetocaloric properties of amorphous alloys was studied. The Curie temperature of this HE-BMG was 572 K. The peak values of the magnetic entropy change and refrigerant capacity (RC) of the Fe₂₅Co₂₅Ni₂₅Cr₅P₁₀B₁₀ HE-BMG were 0.66 J/(kg·K), 42.9 J/kg and 1.88 J/(kg·K), 136.1 J/kg, respectively, under the applied field of 1.5 and 5 T. Compared of the magnetocaloric properties with other amorphous alloys, the high entropy effect did not have obvious effect on the magnetic entropy change of HE-BMGs. However, the magnetic entropy change curves showed a larger full width at half maximum temperature (ΔT_FWHM).
• Select
  Preparation of titanium pillared montmorillonite particles and its adsorption of cadmium ions

  SONG Xiang, TUO Biyang, ZHAO Xuxia, CHEN Bingbing, LONG Wenjiang

  Journal of Functional Materials. 2019, 50(5): 5099-5105. https://doi.org/10.3969/j.issn.1001-9731.2019.05.016

  Abstract ( ) Download PDF ( ) Knowledge map Save

  In order to remove cadmium ions from wastewater, sodium montmorillonite was used as the matrix material, and tetrabutyl titanate was used as the titanium source to prepare titanium pillared montmorillonite. Then, polyvinyl alcohol, sodium alginate and titanium pillared montmorillonite were prepared to prepare titanium pillared montmorillonite particles with a certain mass ratio, and cadmium ion adsorption experiments and particle loss experiments were carried out. The results show that titanium pillared montmorillonite had a large interplanar spacing d₀₀₁ of 3.43 nm. When polyvinyl alcohol:sodium alginate:titanium pillared montmorillonite was 0.6∶1.0∶20.0, 0.25 g of granules were added to 100 mg/L of Cd²⁺ wastewater. The adsorption capacity of Cd²⁺ by titanium pillared montmorillonite reached 7.89 mg/g and the removal rate reached 98.63% after 120 min adsorption at 40 ℃ with ph of 6. The adsorption of Cd²⁺ by the particles fitted well to the Langmuir isotherm model and the adsorption kinetics followed the pseudo-second-order model.
• Select
  Synthesis and properties of Cu₂ZnSn(SSe)₄ thin films

  HOU Guanyu, LIU Yuchao

  Journal of Functional Materials. 2019, 50(5): 5106-5109. https://doi.org/10.3969/j.issn.1001-9731.2019.05.017

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Cu₂ZnSn (SSe)₄ (CZTSSe) thin films were synthesized by different liquid phase precursors. The results showed that the activity of Zn source in the precursors directly affects the properties of CZTSSe crystal materials. It was found by X-ray diffraction and scanning electron microscope that the zinc source provided by hydrazine, S powder and zinc powder was not easy to form nuclei, and the reaction temperature was higher, but it was easy to form large crystals. The energy conversion rate of CZTSSe crystal was 6.21%. The zinc source provided by dry ice, N₂H₄ and zinc powder was easy to form nuclei, but the subsequent reaction of crystal growth was difficult and not easy. The energy conversion of CZTSSe crystal was only 5.50%. The effects of different Zn precursors on the structure, crystal size and conversion of CZTSSe thin films were revealed, and the mechanism was preliminarily discussed.
• Select
  Preparation and properties of alkali lignin-based polyurethane foam with expanded graphite

  LI Xu, LIU Zhiming

  Journal of Functional Materials. 2019, 50(5): 5110-5115. https://doi.org/10.3969/j.issn.1001-9731.2019.05.018

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The alkali lignin-based polyurethane foam material was preparedwith one-step foaming method by modifying the hydroxymethylated alkali ligninand using the modified alkali lignin portion instead of the polyether polyol. And then the expanded graphite was added as a flame retardant to the alkali lignin-based polyurethane foamto prepare flame-retardant biomass polyurethane foam. The flame retardant properties of the flame-retardant biomass polyurethane foam were studied by limiting oxygen index (LOI) test. The thermal degradation behavior and char forming properties, combustion behavior and surface shape of carbon residue after full combustion were analyzed by means of thermo gravimetric analysis (TGA), cone calorimetry (CONE) and scanning electron microscopy (SEM). The results show that the limiting oxygen index of the flame retardant alkali lignin-based polyurethane foam was 30.1%, when 60% amount of polyether glycol was replaced by the hydroxymethylated alkali ligninand the loading amount of EG was 30%. The addition of EG reduced the maximum thermal degradation rate, heat release rate and total heat release rate of the material. Additionally, EG could promote the degradation and charring of the PUF, thereby improving the flame retardant properties of the PUF.
• Select
  Effect of super-hydrophobic structure on surface condensation

  YU Chunhao

  Journal of Functional Materials. 2019, 50(5): 5116-5120. https://doi.org/10.3969/j.issn.1001-9731.2019.05.019

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The super-hydrophobic surface made by the artificial technology is expected to protect the metal surface from condensation, which is very popular now. In this paper, super-hydrophobic surfaces were fabricated by laser etching and nano-solution, respectively, to obtain aluminium and silicon surfaces with super-hydrophobic properties. Then the process of condensation on the samples under certain condition was recorded by high speed camera. The droplet shedding frequency and shedding diameter were tested to measure the resist condensation of super-hydrophobic surface. According to the picture taken by the camera, the result shows that super-hydrophobic surfaces had a better resist condensation compare to the normal aluminum and several types of different structure silicon surfaces. This was because water condensed on the super-hydrophobic surface had a smaller contact surface and contact angle with the super-hydrophobic surface and also the water droplet hung on the micro-nano pillars kept in Cassie-Baxter state, which was very easy to slide from the surface.
• Select
  Rhodamine B adsorption characteristics on magnetic biochar derived from Ginkgo Biloba

  LI Yanchun, ZHANG Penghui, WANG Deqian, HU Haobin, WANG Jiusi

  Journal of Functional Materials. 2019, 50(5): 5121-5127. https://doi.org/10.3969/j.issn.1001-9731.2019.05.020

  Abstract ( ) Download PDF ( ) Knowledge map Save

  A magnetic biochar (MBC) was prepared by chemical precipitation method with Ginkgo biloba as raw material. The synthesized samples were studied systematically by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and BET surface area. Then MBC was applied to remove Rhodamine B (RB) from wastewater. By simulation experiment, adsorption characteristic of MBC to RB was studied, and the effect of pH value, contact time, initial concentration and adsorbent dosage on adsorption capacity was investigated. The results showed that MBC was an ideal absorbent for RB removal. The iron in the MBC existed in the forms of Fe₃O₄.The maximum removal efficiency reached 99.34% under the following conditions: initial RB concentration of 100 mg/L, MBC dosage of 0.2 g and 120 min. The adsorption kinetic could be well simulated by first order model (R²=0.9914). The results from the intra-particle model also showed that the adsorption process was influenced by both liquid film diffusion and intra-particle diffusion. Adsorption isotherms for MBC were fitted the Langmuir-Freundlich (R²=0.9934) more effectively than other models. MBC is an efficient adsorbent to remove RB from waste water of dye.
• Select
  Synthesis and properties of a self-healing black polyurethane

  HU Xianhai, LI Gen, XIAN Yuxi, LIU Xiang, Li Mingjun, HU Pengwei

  Journal of Functional Materials. 2019, 50(5): 5128-5131. https://doi.org/10.3969/j.issn.1001-9731.2019.05.021

  Abstract ( ) Download PDF ( ) Knowledge map Save

  In this paper, self-healing black polyurethane (PU-3BF) was prepared by using dendritic polyester polyol (H3OP) with multi-functional groups as the core.The polyurethane prepolymer was formed into an inner layer by an in situ polymerization.The outer layer was formed by dispersing diazo black 3BF (3BF, CAS: 6232-57-1) in situ crosslinking. The expected structure of PU-3BF was characterized by FT-IR and UV-Vis spectra. The glass transition temperature and thermal stability of polyurethane were studied by DSC and TGA. The self-healing mechanism and property of PU-3BF were studied. The results showed that PU-3BF could be repaired repeatedly at room temperature, and with the increase of self-healing times, the effect on the self-healing efficiency and performance was not obvious.
• Select
  Synthesis and optical properties of Pr doped CaTiO₃ nanophosphors

  YUAN Sicheng, XIE Panping, HU Likun, ZHENG Feng

  Journal of Functional Materials. 2019, 50(5): 5132-5137. https://doi.org/10.3969/j.issn.1001-9731.2019.05.022

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Pure praseodymium doped calcium titanate nanophosphors with average grain size of 56 nm was synthesized by coprecipitation and followed by sintering at 900 ℃. Thermodynamic behavior, crystal structure and optical properties of precursors and CaTiO₃∶Pr nanophosphors were studied by DSC/TG, XRD and PL, respectively. Specific reaction processes during calcination of precursors, and effect of pH and Pr³⁺ doping concentration on structure and properties of CaTiO₃∶Pr powders were examined and discussed in detail. Experimental results showed that grain size of CaTiO₃∶Pr nanophosphors was consistent regardless of pH (5.5-8.5), but increasing pH was beneficial to luminescent performance due to decrease of microstrain inside grain. Optimal Pr³⁺ doping concentration was determined to be 0.1 at%. The results of spectral analysis showed that electric dipole action was dominant cause of concentration quenching effect.
• Select
  The adsorption mechanisms of TiCl₄ and O₂ on the surface of rutile TiO₂(110)

  TIAN Lin, LI Rongxing, YU Xiaohua, HUANG Jun, LIN Yan, ZHUANG Xiaodong

  Journal of Functional Materials. 2019, 50(5): 5138-5145. https://doi.org/10.3969/j.issn.1001-9731.2019.05.023

  Abstract ( ) Download PDF ( ) Knowledge map Save

  In the paper, based on the BLYP and PBE functionalities of generalized gradient approximation (GGA) in density functional theory (DFT), the adsorption of TiCl₄ and O₂ molecules on the surface of rutile TiO₂ (110) and their dissociation process in the most stable adsorption configuration were studied. The results show that the most stable adsorption site of O₂ molecule on the surface of TiO₂ (110) cell was oxygen vacancy. After the O₂ molecule was adsorbed on the oxygen vacancy, one O atom formed a bridge with the Ti5c atom, and the other O atom was added at the same time. The adsorption energy was -11.58 kJ/mol. The Mulliken charge population analysis shows that the charge transfer of O₂ molecule to the surface was 0.12 eV. The most stable adsorption site on the unit cell was the bridge oxygen site with an adsorption energy of -48.64 kJ/mol. The Mulliken charge population analysis shows that the TiCl₄ molecule transfered 0.26 eV charge to the unit cell surface. TiCl₄ molecules were dissociated by the path of —TiCl₄→—TiCl₃→—TiCl₂→—TiCl under the action of O atom (O_ada) after TiCl₄ molecules were adsorbed on the adsorbed sites. In the TiCl₄ molecule dissociation process, the energy barriers in the positive reaction direction were less than those in the reverse reaction direction, indicating that the dissociation process of TiCl₄ molecules was exothermic.
• Select
  High-quality bilayer graphene synthetized on Cu substrate by HFCVD

  CUI Danjie, HUANG Zhewei, JI Zhe, CHEN Xi, SHEN Bin

  Journal of Functional Materials. 2019, 50(5): 5146-5151. https://doi.org/10.3969/j.issn.1001-9731.2019.05.024

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Because of its unique physical properties, bilayer graphene has broad application prospects in electronics filed, which has attracted wide attention of scholars. Here, hot-filament chemical vapor deposition method (HFCVD) was usedto deposit graphene on 1 cm×2 cm Cu substrate. The effect of pressure, substrate temperature, deposition time and carbon source concentration on the layers and quality was investigated to deposit bilayer graphene with low defect. Moreover, the surface morphology, microstructure and layer number of graphene were examined by Raman, SEM and AFM. The results show that a dense low-defect bilayer graphene was uniformly covered on Cu with a thickness of 1.5 nm. In addition, decreasing the pressure would reduce defect and layer number, while increasing the substrate temperature would reduce the layer number, and no graphene formed when deposition time was less than 4 min or carbon source concentration was more than 1%. So the growth of graphene could be implemented controllably by controlling gas pressure, substrate temperature, deposition time and carbon source concentration.
• Select
  Preparation and characterization of ABZ/PPENK microspheres

  JIN Zhao, LIU Hongfu, GUAN Shanshan, GUAN Wenna, JIAN Xigao

  Journal of Functional Materials. 2019, 50(5): 5152-5154. https://doi.org/10.3969/j.issn.1001-9731.2019.05.025

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The preparation of ABZ-PPENK microspheres by emulsifying solvent evaporation method was studied. The morphology and structure of ABZ-PPENK microspheres were characterized by SEM, TEM and FT-IR. The particle size distribution of ABZ-PPENK microspheres was calculated by optical microscopy, and ABZ-PPENK microspheres with different particle size were screened out. The drug loading and encapsulation efficiency of the microspheres were calculated. The ABZ-PPENK microspheres prepared by this method had smooth surface and spherical shape. The average diameter of the microspheres was 9.9 μm. The diameter of the microspheres was close to normal distribution. ABZ drugs were completely encapsulated in the PPENK microspheres, and the drug loading and encapsulation efficiency were high.
• Select
  Preparation and photodegradation of silver bromide/polypyrrole composites

  LI Hang, FU Hai, BAN Daming, GONG Wei, YIN Xiaogang

  Journal of Functional Materials. 2019, 50(5): 5155-5159. https://doi.org/10.3969/j.issn.1001-9731.2019.05.026

  Abstract ( ) Download PDF ( ) Knowledge map Save

  A silver bromide (AgBr)/polypyrrole (PPy) composite was synthesized in one step by using cetyltrimethylammonium bromide (CTAB) as the bromine source, silver nitrate as the silver source and ammonium persulfate to oxidize the pyrrole monomer. The chemical structure, mass specific gravity, crystal structure and morphology of AgBr/PPy composite were analyzed by Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray diffractometry and scanning electron microscopy. The catalytic performance of AgBr/PPy composites for degradation of rhodamine B under ultraviolet light was investigated. The results showed that the composite had a spherical morphology under the electron micrograph. The particle size of AgBr microspheres was 200~300 nm. The XRD pattern diffraction peaks proved the presence of PPy and AgBr in the composite. Affected by the bonding between PPy and AgBr, red shift was observed in the infrared spectrum compared to that of the PPy sample. The TG test showed that the AgBr content in the composite was 29%. Under ultraviolet light, the efficiency of the degradation of rhodamne B by the AgBr/PPy composite was 86% for 60 min, which was better than that of the AgBr sample and also about 10% higher than that of physical mixed sample.
Process & Technology
• Select
  In situ synthesis process and properties of Ni/Fe-LDHs/Fe film based on ferric oxide template

  DU Baozhong, LU Ning, ZHANG Qianlan, WANG Miaojuan

  Journal of Functional Materials. 2019, 50(5): 5160-5165. https://doi.org/10.3969/j.issn.1001-9731.2019.05.027

  Abstract ( ) Download PDF ( ) Knowledge map Save

  A Ni/Fe-NO₃-LDHs/Fe film was prepared on anodized Fe substrate by template in-situ growth method. The pH of the reaction solution was adjusted by NH₃·H₂O to release Ni²⁺ slowly by the formation of nickel-ammonia complexion. Sulfosalicylic acid anion intercalated Ni/Fe-SSA-LDHs/Fe composite film was synthesized through ion-exchange method using the Ni/Fe-NO₃-LDHs/Fe film as precursor. The prepared film was investigated by XRD, FT-IR, SEM,UV-Vis,TG/DTA and electrochemical test. The results confirmed the successful incorporation of SSA anions into the interlayer galleries of NI/Fe-LDHs with an expansion of d-spacing from 0.9051 to 1.1837 nm. The LDHs films were mainly oriented with the c axis of the platelet crystallites parallel to the substrate surface. The results indicated that the as-prepared LDHs films possessed excellent corrosion-resistant and UV absorption properties.
• Select
  Preparation and mechanical properties of alternating multilayered silicone rubber with different silica content

  LUO Fang, JIA Yalan, LIU Tao, ZHANG Fengshun, LUO Shikai, ZHANG Xianlong

  Journal of Functional Materials. 2019, 50(5): 5166-5170. https://doi.org/10.3969/j.issn.1001-9731.2019.05.028

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The silicone rubber materials with soft and hard alternating multilayered structure were successfully fabricated by multilayer co-extrusion technique. The influence of alternate multilayer structure on the mechanical properties of silicone rubber was discussed. The regular and continuous multilayered structure was observed. Meanwhile, with the increase of the layer number, the tensile strength and elongation at break increased, and the compressibility was also obviously improved. Compared with that of 3-layer of silicone rubber, the elongation at break and tensile strength of 129-layer silicone rubber were increased by 42.5% and 70.2%, respectively.
• Select
  Structural control and magnetostrictive properties of Fe_71.3Ga_28.7

  LIU Yongqing, CHENG Chao, ZHANG Hongping

  Journal of Functional Materials. 2019, 50(5): 5171-5174. https://doi.org/10.3969/j.issn.1001-9731.2019.05.029

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The effects of zone melting directional solidification rate and heat treatment regime on the microstructure, crystal structure and orientation of Fe_71.3Ga_28.7 alloy were investigated. The results show that when the zone melting rate was 72 mm/h, the A2 phase was obtained. When the zone melting rate was 36 mm/h, the A2+D0₃ phase was obtained. When the zone melting speed was small, the strong η-type fiber texture was formed in the alloy bar. Quenching treatment at 680 ℃ could greatly improve the magnetostrictive properties of the material. But when quenched at 580 ℃ or furnace cooled at 705 ℃, L1₂ phase was obtained, resulting in a negative value of the magnetostriction coefficient.
• Select
  Preparation and adsorption properties of 3D graphene synergistic magnetic functional materials

  ZHU Chen, LIU Min, LI Xiaoyan, LIU Li, WANG Fang

  Journal of Functional Materials. 2019, 50(5): 5175-5174. https://doi.org/10.3969/j.issn.1001-9731.2019.05.030

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Fe₃O₄ nanoparticles were synthesized by co-precipitation method. 3D graphene was modified on the surface of Fe₃O₄ nanoparticles, and then covered with tetraethyl orthosilicate(TEOS) and vinyltrimethoxysilane(VTMO). Finally, the magnetic functional material Fe₃O₄@3DG@VTMO@MPS was synthesized by the polymerization of functional monomer 3-mercapto-1-propanesulfonate(MPS) on the surface using “thiol-ene” click chemistry. The structure, morphology and thermal stability of the functional materials were characterized by scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), dynamic light scattering(DLS), Fourier transform infrared spectroscopy(FI-IR) and thermogravimetric analysis(TGA), respectively. The adsorption properties of this functional material for Lysozyme were studied by static adsorption experiments. The results show that the magnetic functional materials had nice adsorption capacity(the maximum adsorption capacity was 162.1 mg/g) and fast adsorption kinetics(the adsorption equilibrium could be reached in 150 min). The pseudo-second-order kinetic model was suitable for describing the adsorption kinetics of lysozyme on functional materials, and the adsorption process of functional materials on lysozyme was more in line with Langmuir adsorption model, indicating that adsorption is monolayer adsorption. Fe₃O₄@3DG@VTMO@MPS as solid phase extraction materials as solid phase extraction materials could be used for separation and enrichment of lysozyme, then combined with high performance liquid chromatography(HPLC) to detect honey in actual samples.
• Select
  Curing effect of MgAl₂O₄ spinel to aluminum dihydrogen phosphate

  YANG Xiaobo, SUN Zhiqiang, MIAO Zhenjiang, WANG Huadong, WU Tao

  Journal of Functional Materials. 2019, 50(5): 5185-5189. https://doi.org/10.3969/j.issn.1001-9731.2019.05.031

  Abstract ( ) Download PDF ( ) Knowledge map Save

  MgAl₂O₄ spinel powders were first applied for aluminum dihydrogen phosphate hydrosol curing reaction. The solidification of spinel powders to phosphate hydrosol was studied in middle and low temperature condition. Besides, composites were prepared with quartz textile as reinforcing part, aluminum hydrogen phosphate hydrosol as matrix and spinel MgAl₂O₄ as firming agent. Curing temperature of phosphate hydrosol and the additive content of spinel MgAl₂O₄ powders were measured by thermogravimetric analysis and differential scanning calorimeter. At the same time, the crystalline phase of curing products was identified by X-ray powders diffraction. Microstructures of the composites were observed by scanning electron microscope. Moreover, the mechanical and resistant moisture absorption properties of phosphate composites were investigated. The results showed that aluminum dihydrogen phosphate resin had occurred dehydration reaction and formed into cross-linkage net in the temperature near to 170 ℃,while the resin was added spinel MgAl₂O₄ powders. And it was contributed to reduce original pores and flaws in the matrix with mild reaction process. Owing to the promoting effect of spinel, the mainly reaction products were aluminum phosphate with the style of quartz and magnesium phosphate with monoclinic structure. Meanwhile, the reaction that aluminum dihydrogen phosphate changed into aluminum polyphosphate was prevented, which was benefit to enhance the resistant moisture absorption property of the composite. When the content of spinel MgAl₂O₄ powders arrived at 18wt%, the composite obtained the highest properties, which the flexual strength at room temperature and at 800 ℃ were about 165 MPa and 75 MPa. And dielectric properties of the composite were remained stably during long time storage, which dielectric constant was about 3.5 to 3.6 and loss tangent was less than 0.01 at room temperature respectively.
• Select
  Optimization of the tribological properties of PTFE-based composites based on orthogonal experiments

  XIA Lu, XIE Ting

  Journal of Functional Materials. 2019, 50(5): 5190-5193. https://doi.org/10.3969/j.issn.1001-9731.2019.05.032

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Polytetrafluoroethylene(PTFE)is an excellent solid self-lubricant material, which has a wide range of industrial applications. In this paper, PTFE was modified with lubricants graphite (Gr), molybdenum disulfide(MoS₂) and reinforcements glass fiber (GF), carbon fiber (CF). The orthogonal experimental design was used to establish the orthogonal experimental table with the volume fraction of each filler as the orthogonal experimental design factor and the wear rate and friction coefficient as the objective factors. Through orthogonal analysis, the effect of different volume fraction of fillers on tribological properties of PTFE-based composites was studied. The result showed that the sequence of factors that influenced the friction coefficient of PTFE-based composites is Gr, MoS₂, GF and CF. The order of the factors that influenced the wear rate of samples is GF, CF, MoS₂ and Gr. The optimizing formulation was proposed according to the analysis of the experiment results, it may provide some references for the optimization design of tribological properties of high-performance PTFE composites.
• Select
  Study on preparation and electrochemical properties of nano-MoS₂ and MoS₂-RGO nano-composites

  ZHANG Jie, ZENG Xiaofei, LI Kexun, MA Jiangjiang, WANG Donghong

  Journal of Functional Materials. 2019, 50(5): 5194-5198. https://doi.org/10.3969/j.issn.1001-9731.2019.05.033

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The preparation of electrode material with good electrochemical properties is the key to promote the performance of new type energy storage device. Molybdenum disulfide (MoS₂) has the structure similar to grapheme. The interlayer of MoS₂ can store charge efficiently.However, the conductivity of MoS₂ is poor. In order to improve the conductivity of electrode, MoS₂ is need to compound with other materials. Two kinds of nano-MoS₂ with different morphology and structure were synthesized by hydrothermal method using ascorbic acid and thiourea as reducing agent, respectively. Using graphene as template, molybdenum disulfide-reduced graphene oxide (MoS₂-RGO) nano-composite was synthesized by hydrothermal method. The electrochemical properties were characterized by cyclic voltammetry and galvanostatic charge-discharge. The results show that MoS₂-RGO nano-composite appeared a double layer capacitance. The specific capacitance of MoS₂-RGO reached to 136.2 F/g at the current density of 1 A/g.
• Select
  Preparation of environmental-friendly conductive silver paste and properties of electronic paper

  HOU Chengmin, KOU Yanping, LI Na, CAO Congjun

  Journal of Functional Materials. 2019, 50(5): 5199-5203. https://doi.org/10.3969/j.issn.1001-9731.2019.05.034

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Conductive silver paste is a key functional material for the preparation of electronic components. Conductive silver paste with silver and starch used as conductive fillers was prepared by redox method with molar ratio of starch to silver nitrate of 2∶1, 1∶1, 1∶2 and 1∶3. The effect of physical factors, such as heating and sintering, ultraviolet light irradiation, soaking water, and ultrasonic wave, on the conductivity of the conductive silver paste was studied by measuring resistance, and the morphology of the conductive silver paste was observed with a microscope. The results showed that when the starch/silver nitrate was 1∶3, the uniform conductive particles with starch as core and silver particles as shell were formed. When the ratio was 1∶2 and 1∶3, the resistivity decreased to 60% to 70% of the initial value during the low-temperature heating and sintering. The resulting silver paste was resistant to UV light, blisters and ultrasound. Among them, the conductivity for the sample prepared with the molar ratio of 1∶3 was the best. Finally, a silver paste with a starch/silver nitrate ratio of 1∶3 was mixed with 30%, 45%, or 60% of the ink, coated with paper, and subjected to low-temperature thermal sintering, and the resulting electronic paper had a resistivity of 10 mΩ/cm.
• Select
  Preparation and electrochemical performance of humic acid/graphene composites

  CHANG Qimin, LI Ying, BAI Lizhong

  Journal of Functional Materials. 2019, 50(5): 5204-5208. https://doi.org/10.3969/j.issn.1001-9731.2019.05.035

  Abstract ( ) Download PDF ( ) Knowledge map Save

  The humic acid/graphene composite material was produced by heating reduction method with hydrazine hydrate using humic acid extracted from lignite and graphene oxide prepared from natural graphite. The morphology and microstructure of the composites were characterized by X-ray diffraction (XRD), Raman spectroscopy (Raman), scanning electron microscopy (SEM) and electrochemical tests. The results show that the humic acid was uniformly dispersed in the graphene sheet to form a sandwich porous framework structure, which could shorten the path of electrolyte propagation and transportation. When the current density was 50 mA/g, the composite material HRGO-0.1 exhibited high specific capacitance (185 F/g) as an electrode material with low resistivity and a good capacitance ratio.
• Select
  Influence of polyphosphate flame retardant on PC/ABS alloy

  GOU Jia, SHEN Huiying, CHEN Chao, QIN Wei, GONG Wei, BAN Daming

  Journal of Functional Materials. 2019, 50(5): 5209-5214. https://doi.org/10.3969/j.issn.1001-9731.2019.05.036

  Abstract ( ) Download PDF ( ) Knowledge map Save

  A novel flame retardant, poly (2-10-hydrogen-9-oxa-phosphaphenanthrene hydroquinone phenyl phosphate) (POPP), was incorporated to PC/ABS to improve the flame retardancy of PC/ABS. Flame retardant properties of PC/ABS were investigated by limited oxygen index test, vertical combustion test, thermal gravimetric analysis test, cone calorimetric test and scanning electron microscopy test. The results showed that the addition of 15% POPP to PC/ABS could achieve UL-94 V-0 grade with LOI value of 21.1%. The cone test showed that peak of heat release rate and total heat release decreased by 41.7% and 31.1%, respectively. TGA and SEM analysis demonstrated that the modified PC/ABS alloy exhibited better char forming effect, which promoted the formation of dense porous carbon layer on the surface after combustion, and effectively insulated the oxygen to improve the flame retardant properties of the material.
• Select
  The study to the removal of copper(Ⅱ) ions by sodium alginate loaded with HFO gel spheres

  LIU Shan, LIU Danrong, SUN Zhaohui, ZHANG Yue, ZHAO Chunpeng, WEI Li

  Journal of Functional Materials. 2019, 50(5): 5215-5220. https://doi.org/10.3969/j.issn.1001-9731.2019.05.037

  Abstract ( ) Download PDF ( ) Knowledge map Save

  Based on the embedding method, millimeter sodium alginate ball SA/HFO hydrated ferric oxide gel was prepared to study the adsorption behavior of Cu(Ⅱ) in water. The results showed that the best pH of SA/HFO gel ball for Cu(Ⅱ) was 5.5. The kinetic study showed that the equilibrium time of adsorption was 21 h, and the adsorption process was more consistent with the quasi-second-order kinetic model. The adsorption isotherm fitting results revealed that the adsorption behavior was more consistent with the Langmuir adsorption isotherm model. And the temperature data showed that increasing the temperature was conducive to the reaction, and the thermodynamic process was spontaneous, endothermic and entropy increasing. The SA/HFO gel ball was conducted desorption and adsorption experiments again after adsorption of Cu(Ⅱ), and it could still maintain good adsorption properties after eight cycles.