30 April 2018, Volume 49 Issue 4
    

  • Select all
    |
    Focuses & Concerns (The Project of Chongqing Press Fundin 2017)
  • MA Tongxiang, GAO Leizhang, HU Mengjun, HU Liwen, WEN Liangying, HU Meilong
    Journal of Functional Materials. 2018, 49(4): 4001-4006. https://doi.org/10.3969/j.issn.1001-9731.2018.04.001
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Hydrogen as a promising clean energy has received more and more attention, and the key to the development and utilization of hydrogen energy is to solve the problem of hydrogen storage. The traditional high-pressure gas hydrogen storage is poor in safety and low in hydrogen storage. Low-temperature liquefied hydrogen storage not only requires high thermal insulation storage tank, but also has high hydrogen storage energy consumption. Since the solid hydrogen storage materials can do well to solve these problems, they have become the main research direction of hydrogen storage technology at present. At present, the main solid-state hydrogen storage materials are alloy hydrogen storage, carbonaceous materials for hydrogen storage and complex hydrogen storage. In this article, the hydrogen storage principle, characteristics, research status and problems to be solved of various hydrogen storage materials are focused on, and the development direction of hydrogen storage materials was pointed out.
  • SHEN Dandan, TANG Wenyong, WANG Zhongyang, LIU Sihua, WU Chunrui, LYU Xiaolong
    Journal of Functional Materials. 2018, 49(4): 4007-4013. https://doi.org/10.3969/j.issn.1001-9731.2018.04.002
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Silicone rubber/polyvinylidene fluoride (PVDF) hollow fiber composite membranes were prepared by solution coating-curing method. The influence of coating times, coating solution concentration, coating and curing temperature on the structure and performance of the membranes were studied. The membrane distillation (MD) performance, especially the stability of the performance in surfactant containing solution treatment was detected. The results showed that uniform silicon-rubber layer was formed after three times of coating process. The pure water contact angle of the membrane was improved from 78° (PVDF membrane) to 149°. When used in MD process for the treatment of solution containing sodium chloride and surfactant (e.g., sodium dodecyl benzene sulfonate (SDBS)), the virgin PVDF membrane was leaking in about 20 min of experiment. The flux of the composite membrane was kept at about 36.6 kg/(m2·h) in 2 h of continuous experiment with a permeate conductivity of 16.0 μS/cm.
  • XIONG Kun, JIN Peiwen, DENG Renhao, ZHOU Lin
    Journal of Functional Materials. 2018, 49(4): 4014-4017. https://doi.org/10.3969/j.issn.1001-9731.2018.04.003
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Hydrogen energy is a clean, high energy, environmentally friendly resource and considered as one of the most promising candidates for replacing fossil fuels in the future. In this work, 3D Ni foam (NF) was etched by hydrofluoric acid (HF), followed by phosphorization in tube furnace to obtain an integrated electrode (Ni2P/E-NF). The relative surface area of Ni2P/E-NF is almost 2.8 times as high as that of NF. The designed Ni2P/E-NF as a binder-free integrated electrode displays enhanced catalytic activity of hydrogen production with a low onset overpotential of about 27 mV. For driving a cathodic current density of 10 mA/cm2, it only needs an overpotential of 63 mV. The negligible difference in the polarization curves from before and after 4 000 CV cycles indicates that the Ni2P/E-NF has excellent electrochemical stability. Such excellent performance of Ni2P/E-NF could be ascribed to the rich surface area and exposed active sites to be utilized during the HER.
  • REN Qian, HE Hanbing, ZHANG Li, QIN Yihong
    Journal of Functional Materials. 2018, 49(4): 4018-4023. https://doi.org/10.3969/j.issn.1001-9731.2018.04.004
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A series of iron based metal organic frameworks MIL-100 (Fe)(xCTAB, x=1/4,1/6,1/12) were prepared by hydrothermal synthesis under the action of surfactant cetyltrimethylammonium bromide (CTAB), with n(Fe)∶n(1,3,5-BTC)∶n(HNO3)∶n(HF)∶n(H2O)=1.0∶0.67∶0.6∶2.0∶277. The prepared catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), specific surface area analyzer (BET), Fourier transform infrared spectroscopy (LR) and microscopic laser Raman spectroscopy (Raman). The results showed that MIL-100 (Fe) (xCTAB, x=1/4,1/6 ,1/12) synthesized by surfactant CTAB had more regular crystal shape, larger specific surface area and higher dispersion than those of MIL-100 (Fe)synthesized without CTAB. The catalytic activity of CO-SCR showed that the catalytic activity of MIL-100 (Fe) (1/4 CTAB) was nearly 40% higher than that of MIL-100 (Fe) at 200 ℃. Moreover, in the sulfur resistance test at 220 ℃, the denitrification rate of MIL-100 (Fe) (1/4CTAB) was still about 88% after SO2 was introduced, and the denitrification rate could return to the original level after the SO2 was stopped.
  • JIANG Xuewei, DONG Jie, ZHAO Xin, ZHANG Qinghua
    Journal of Functional Materials. 2018, 49(4): 4024-4031. https://doi.org/10.3969/j.issn.1001-9731.2018.04.005
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Recently, thermally rearranged (TR) poly(benzoxazole-co-imide) have been paid a lot attention due to their outstanding gas separation performance. Herein, the copolymers 6FDA-APAF/TFMB (molar ratio of n(APAF)∶n(TFMB)=5∶5) containing hydroxyl were synthesized by chemical imidization and they were thermally rearranged at different temperatures. The 4,4′-(hexafluoroisopropylidene) diphthalicanhydride (6FDA) was used as dianhydride monomer, and 2,2′-bis(3-Amino-4-hydroxyl-phenyl) hexafluoropropane (APAF) and 4, 4′- diamino-2, 2′- trifluoromethyl biphenyl (TFMB) were used as diamine monomers. Their physical properties and gas permeation behaviors were investigated. The polyimide precursor has a fairly good solubility in most of the solvents such as NMP, DMAc and DMF, that ensures good film processing. The results show that benzoxazole ring is formed successfully after thermally rearranged at 350-450 ℃. In nitrogen, the TR400-2 has 5% weight loss at temperature of 491 ℃ and 10% weight loss at temperature of 519 ℃. All films' breaking strength and elongation at break are in the range of 85-136 MPa and 3.0%-9.0%, respectively. The gas permeability for CO2 increases from 7.2 to 36.7 mol/(m2·s·Pa) and the CO2/CH4 selectivity decreases a little with increasing the treating temperature. The thermally rearranged films exhibit good thermal stability and mechanical property. In general, the results show that the permeability and separation selectivity of thermally rearranged (TR) poly(benzoxazole-co-imide) have been enhanced obviously, which proves that thermally rearranged membranes have a great application prospect in the field of gas separation.
  • Review & Advance
  • SUN Mengya, MA Jie, ZENG Yulan, LIU Zhenhua
    Journal of Functional Materials. 2018, 49(4): 4032-4039. https://doi.org/10.3969/j.issn.1001-9731.2018.04.006
    Abstract ( ) Download PDF ( ) Knowledge map Save
    As an important functional nanomaterial, magnetic nanomaterials are paid widespread attention from researchers of many different fields. The surface functionalization of magnetic nanomaterials is often the key to their application in many fields. In recent years, internal and external scholars have made great progress in their researches on surface modification techniques of magnetic materials, which have the reference value to the application of magnetic nanoparticles. In the short review, the research developments in this field are systematically classified and summarized in the latest years. The tendency of application on magnetic nanomaterials is also speculated in this paper.
  • YAO Fuyou, SHU Zhaozhu, LONG Jianping
    Journal of Functional Materials. 2018, 49(4): 4040-4045. https://doi.org/10.3969/j.issn.1001-9731.2018.04.007
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In recent years, a large number of experiments and modeling studies have been conducted on lithium-ion air batteries by domestic and foreign scholars. Among them, multiphase transmission is the key and difficult point in the research. In order to better study the reaction mechanism of lithium-air battery, the multiphase transmission process during battery reaction has been studied deeply. The phenomena of heterogeneous transport involve two aspects of oxygen dissolution and oxygen precipitation: (1) the coupling reaction of lithium ions in the liquid electrolyte and the electrons in the solid electrode material and the porous structure, and (2) other reactions, in particular, growth of the discharge product on the porous cathode surface during discharge of the battery. The focus of the discussion is on the morphology of the solid product, the clogging effect of the voids, the reduction of the specific surface area and the passivation effect. At the same time, the macroscopically continuous model is introduced in order to provide a comprehensive overview of the effectiveness and limitations of these methods. In order to better understand the mechanism of heterogeneous transport phenomena and the appearance of cathode products in lithium air, detailed explanations and suggestions are given.
  • Research & Development
  • ZHAO Li, PAN Jing, LIU Xincai, YANG Menglin, DONG Mingyue, LING An
    Journal of Functional Materials. 2018, 49(4): 4046-4053. https://doi.org/10.3969/j.issn.1001-9731.2018.04.008
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The dependence of the nucleation undercooling degree ΔT- of Nd9Fe72Ti4C2B13 permanent magnetic alloy on its melt overheating degree ΔT+ was studied by differential thermal analysis. On this basis, the effects of the melt overheating degree on the glass formability,microstructure evolution and magnetic properties of the alloy were investigated by thermal analysis combining with microstructure analysis and magnetic properties test of the ribbons melt-spun at different melt overheating degree. The results show that the melt overheating degree threshold of the alloy corresponding to its turning points of the mean undercooling degree is found to be 67 K. The ΔT- increases sharply by 58 K with the ΔT+ increasing during the range of 8-67 K, but it increases a little and the mean undercooling degree reaches 181 K when the ΔT+ raises during 67-146 K. The microstructure of the ribbon melt-spun at ΔT+=60 K is composed with Nd2Fe14B, Fe3B, α-Fe, Nd2Fe23B3 and a small amount of amorphous phases. And the amorphous content increases gradually while the Nd2Fe23B3, α-Fe and Fe3B nanocrystals gradually disappear as ΔT + raises from 60 to 130 K, and the completely amorphous structure is obtained when the ΔT+ reaches 130 K. The metastable phase Nd2Fe23B3 that is detrimental to magnetic properties exists in the annealed ribbon melt-spun at ΔT+=60 K, causing its magnetic properties to be very low. But only Nd2Fe14B, Fe3B and α-Fe nanocrystals are found in the annealed ribbons melt-spun respectively at ΔT+=90, 110 and 130 K, and the magnetic properties of these ribbons are substantially higher than those of the annealed ribbon melt-spun at ΔT+=60 K. Among these annealed ribbons, the magnetic properties of the ribbon melt-spun at ΔT+=90 K achieve maximum values, and its optimum magnetic properties are Hci=521.57 kA/m, Br=0.75 T, (BH)max=66.31 kJ/m3 and Mr/Ms =0.67.
  • LI Yuquan, YANG Bo, HUANG Wei, LU Ai
    Journal of Functional Materials. 2018, 49(4): 4054-4058. https://doi.org/10.3969/j.issn.1001-9731.2018.04.009
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Silicone rubber, with unique structure and outstanding properties, plays an important part in vast fields from nuclear power equipment to aviation. As the radiation is quite common in these serves environment, how to promote the radiation resistant property is of interest. In this work, grapheme oxide (GO) filled silicone rubber was prepared and irritated by Co 60 as the radioactive source. Since the GO has similar structure to that of aromatic compounds, it is expected that GO will serve as a radiation resistant addiction in the silicone rubber. The mechanical and thermal properties of the samples before and after irritation were tested to study the effect of GO on the anti-radiation property of the silicone rubber. Dynamic mechanical analyzer (RSA G2) was employed to test the dynamic mechanical properties, differential scanning calorimeter (DSC) and thermal gravity analyzer (TGA) were employed to investigate the crystallization and thermal stability. The results of experiment and theoretical analysis show that graphene oxide has an inprovement on the synergistic effect of the silicone rubber system, and as well as the radiation resistance. The main mechanical and thermal properties like tensile breaking strength, storage modulus and crystallization temperature do show a better stability with the presence of GO, although part of the thermal stability was sacrificed.
  • WANG Huiqiang, LIU Minghua, LUO Xin, CHEN Feier, LYU Xinze
    Journal of Functional Materials. 2018, 49(4): 4059-4066. https://doi.org/10.3969/j.issn.1001-9731.2018.04.010
    Abstract ( ) Download PDF ( ) Knowledge map Save
    ZnO/AC composites, Fe2O3/AC composites, ZnFe2O4/AC and AC blank materials, composites were prepared by In-situ hydro-thermal method using the activated carbons as supporter. The structure and properties of the obtained composite were characterized by scanning electron microscope (SEM), X-ray spectrometer (EDS), X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR), physical adsorption instrument(BET) and X-ray photo-electron spectroscopy (XPS) analysis. In addition, the adsorptive property of AC was tested at 30 ℃ in simulated flue gas. The results showed that the metal oxide compound, as an active component, was successfully loaded on activated carbons. After introducing the metal oxide compound, the specific surface area pore volume decreased, while the pore diameter increased, and the SO2 adsorption can be improved significantly. It was confirmed that desulphurization efficiency by activated carbon loaded with ZnFe2O4 which processed a high specific surface area of 435.9 m2/g, entrance of 0.37 cm3/g, the desulfurization performance test sample breakdown in the time of 136.0 min, and the sulfur capacity of 168.3 mg/g, in comparison to the AC、ZnFe2O4 and other composite materials.
  • MA Mingyue, LEI Genzhu, ZHANG Zhie, LIAO Shuangquan
    Journal of Functional Materials. 2018, 49(4): 4067-4071. https://doi.org/10.3969/j.issn.1001-9731.2018.04.011
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The Natural rubber latex consists of rubber hydrocarbon, water and non-rubber components. Properties of latex film are known to be influenced by the content of protein and phospholipids. In this paper, the deproteinized natural rubber (DPNR), lipid-free natural rubber (PNR) and lipid-free DPNR (P-DPNR) were prepared by high speed refrigerated centrifugation, treatment with enzyme decomposition (alkaline proteinase, lipid enzyme) and high speed centrifugation, research on the impact of protein and phospholipids to tensile properties, transmittance, thermal stability and morphology. The results showed that nitrogen content, lipid content and crosslinking density decreased; the tensile properties of DPNR and PNR decreased from 25.14 to 15.81 and 16.57 MPa, the elongation of DPNR and PNR increased from 810.6% to 930.8% and 895%; the transmittance of DPNR and PNR increased from 71.12% to 85.31% and 85.62%; the film stretching section appears a few holes, particles, after enzyme treatment. The results demonstrated that protein and phospholipids influence the formation of the natural rubber crosslinking between molecular chain network, thus affecting the properties of the film.
  • LI Yueming, HONG Qian, XIE Zhixiang, SHEN Zongyang, WANG Zhumei, SONG Fusheng, HONG Yan
    Journal of Functional Materials. 2018, 49(4): 4072-4076. https://doi.org/10.3969/j.issn.1001-9731.2018.04.012
    Abstract ( ) Download PDF ( ) Knowledge map Save
    (1-x)Zn0.97Cu0.03Zr(Nb0.93Ta0.07)2O8-xTiO2(x=0, 0.4, 0.45, 0.5, 0.55, 0.575, 0.6) microwave dielectric ceramics were prepared by conventional solid method using ZnO, ZrO2, CuO, Nb2O5, Ta2O5 as raw materials. The effect of TiO2 additives on crystal structure, sintering properties, microstructure and microwave dielectric properties was investigated. The results reveal that with the increasing additive amount of TiO2, the crystal structure of (1-x)Zn0.97Cu0.03Zr(Nb0.93Ta0.07)2O8-xTiO2 ceramics changes, and meanwhile the sintering temperature of the ceramics decreases significantly, their dielectric constant increases gradually, the frequency temperature coefficient is close to zero gradually. The optimal microwave dielectric properties were achieved when x=0.575 with the dielectric constant εr=36.25, quality factor Q×f =53 109 GHz and frequency temperature coefficient τf=6.24×10-6/℃,when ceramics were sintered at 1 070 ℃ for 4 h.
  • JIA Yanyan, LI Zhefu, QIU Jie, LENG Bin
    Journal of Functional Materials. 2018, 49(4): 4077-4081. https://doi.org/10.3969/j.issn.1001-9731.2018.04.013
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Molten-salt reactor (MSR), one of the most promising next generation reactors, has incomparable advantages: inherent safety, fission fuel sustainable utilization, producing less long-lived wastes, excellent heat transfer characteristics and so on. Thorium-based molten salt reactor technology is an important way to supply long-term nuclear energy for the future. Hastelloy N alloy used as the structural material in MSR directly contacts with fluoride salts. Fission product Te leads to intergranular embrittlement of Hastelloy N alloy, which seriously affects the service life of Hastelloy N. There are many kinds of element in Hastelloy N alloy and the reaction products of Te and Hastelloy N are complicated. Therefore, it is difficult to analyze the intergranular embrittlement caused by Te. In the present study, the effect of diffusion time on the intergranular embrittlement of Te into nickel (Ni) was investigated to reveal the relations between Ni and Te. The electroplating method was used for preparing samples and the research was mainly concerned on varieties and stability of surface reaction products, tensile property, fracture morphology, trend of cracking and intergranular diffusion depth analysis. This study is helpful to improve Hastelloy N alloy to resist intergranular embrittlement. The results indicate that the main product was Ni3Te2 at 700 ℃, which had good thermal stability. Compared with samples of nickel without Te, the ultimate tensile strength (UTS) of samples with Te dramatically decreased, whereas the elongation was not obviously changed in the diffusion time range from 24 h to 1000 h. Fracture of the alloy with Te exhibited brittle fracture with intergranular section near the surface and transgranular fracture in the center. The depth of diffusion of Te into nickel and intergranular fracture gradually increased with time extension.
  • GE Shuping, ZOU Xingzheng, LIANG Mingyue, GE Shuang, YIN Tieying, WANG Guixue, XU Kai
    Journal of Functional Materials. 2018, 49(4): 4082-4088. https://doi.org/10.3969/j.issn.1001-9731.2018.04.014
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The magnesium alloys have been used as new types of degradable biomedical metal materials. Their mechanical properties, biocompatibility, biodegradation performance are excellent. In recent years, they have become the focus of research in the areas of medical materials. However, their corrosion rate is rapid and not uniform, which hinders their application and development. Therefore, surface modification, increasing the corrosion resistance and improving the biocompatibility have become important parts in development and application of degradable magnesium alloys. This paper used a kind of natural polymer in cells, namely poly-beta hydroxy butyric acid ester (PHB) as coating material. The surface morphology and biological compatibility of materials were investigated after preparing the PHB coating on WE43 magnesium alloy. The experimental results showed that the polymer coating was evenly distributed on the WE43 magnesium alloy surface and had a better protective effect on the materials. In addition, the PHB coating significantly improved the blood compatibility of magnesium alloy, promoted the proliferation and migration of cells. The research will provide a new way for the study of degradable magnesium alloy materials.
  • GENGZANG Duojie, CAI Rangcuo, CHEN Wanjun, ZHANG Guoheng, CHEN Qiong, AN Xiujia
    Journal of Functional Materials. 2018, 49(4): 4089-4093. https://doi.org/10.3969/j.issn.1001-9731.2018.04.015
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Iron doped zinc oxide (ZnO∶Fe) thin films were successfully deposited on Si wafer by radio frequency magnetron sputtering method, and annealed in the vacuum and air. The microstructure was detected by X-ray diffraction (XRD), the surface/cross-section morphology was observed by scanning electron microscopy (SEM), and the ferromagnetism of the films was measured by vibrating sample magnetometer (VSM). The experimental results demonstrate that the ZnO:Fe films have a hexagonal wurtzite structure with highly c-axis preferential orientation. It is found that the annealing atmosphere has some influence on the microstructure of the film. When annealed in the air, the films show the strongest (002) diffraction peak, the grain size becomes the largest, the crystallinity and orientation of the film are obviously better. Furthermore, the ferromagnetism of ZnO:Fe films at room temperature have been proved by the results of VSM measurement. It is found that the saturation magnetization of samples in vacuum annealing was much larger than that in air, and the analysis suggests that this could be caused by oxygen defects in thin films.
  • BAO Lihong, TAO Ruyu, TEGUS
    Journal of Functional Materials. 2018, 49(4): 4094-4097. https://doi.org/10.3969/j.issn.1001-9731.2018.04.016
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The multiple rare-earth hexaboride La0.2Ce0.8B6 single crystal with large size and high quality has been fabricated by the floating zone method. The (110) and (310) crystal surfaces of La0.2Ce0.8B6 are oriented by the X-ray Laue diffraction method and their thermionic emissions properties are measured. The results show that the maximum emission current densities of the (110) and (310) crystal surfaces at 1 673,1 773 and 1 873 K are 3.60, 7.73, 12.44 A/cm2 and 3.25, 11.67, 16.93 A/cm2, respectively. It means that the thermionic emission is strongly anisotropic for the different crystal surfaces. The average value of effective work functions of (110) and (310) crystal surfaces at different temperatures are calculated to be 2.85 eV and 2.80 eV, indicating an excellent thermionic emission properties of La0.2Ce0.8B6 single crystal.
  • ZANG Guozhong, WANG Xiaofei, LI Liben, WANG Dandan
    Journal of Functional Materials. 2018, 49(4): 4098-4101. https://doi.org/10.3969/j.issn.1001-9731.2018.04.017
    Abstract ( ) Download PDF ( ) Knowledge map Save
    SnO2-Zn2SnO4 ceramics were prepared using traditional ceramic technology. A comparison of the electrical performance for SnO2-Zn2SnO4 and a certain type commercial SrTiO3 varistor-capacitor ceramics were provided. The results show that although the breakdown voltages for both materials are lower than 10 V/mm, SnO2-Zn2SnO4 ceramics have more excellent varistor properties and the nonlinear coefficient is as high as 7.6 while maintaining low leakage current density of 56 μA/cm2. At 40 Hz, the relative permittivity of SnO2-Zn2SnO4 ceramics is as high as 2×104, which is much lower than 9×104 of SrTiO3. Moreover, the dielectric loss is much higher than that of SrTiO3 and it decreases sharply with increasing frequency. The comparative study indicates that SnO2-Zn2SnO4 ceramics have potential applications.
  • LI Na, XU Zhonghui, LI Ping, JIANG Zao, XU Yahong, YANG Feihua, HUANG Yang
    Journal of Functional Materials. 2018, 49(4): 4102-4106. https://doi.org/10.3969/j.issn.1001-9731.2018.04.018
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The pozzolanic activity of coal fly ash was activated by mechanical force ball milling, and the properties of coal fly ash based geopolymer before and after mechanical activation were studied.The formation mechanism of mechanical activated coal fly ash and geopolymer was analyzed. The results indicated that the hydration speed of geopolymerization after mechanical activation was obviously improved and the compressive strength of geopolymer blocks increased to 79.97 MPa after curing for 28 d. Meanwhile, the geopolymer specimens after mechanical activation exhibited even better anti-freeze-thaw performance and appeared more compact. The results of XRD, FT-IR and SEM analysis showed that the main hydration product of the fly ash-based geopolymer was amorphous gel. Mechanochemical method is an effective way to activate the pozzolanic activity of coal fly ash and allow the geopolymerization more sufficient.The structure of the activated geopolymer is more compact, which provides a theoretical basis for the engineering application of high performance coal fly ash based geopolymer.
  • CHEN Guangjian, ZHANG Lili, ZHANG Changqi, FENG Xinxing
    Journal of Functional Materials. 2018, 49(4): 4107-4111. https://doi.org/10.3969/j.issn.1001-9731.2018.04.019
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Nylon 1211 was successfully synthesized using a step heating melt polycondensation. FT-IR and 1H NMR were utilized to confirm the successful synthesis of nylon 1211. Meanwhile, the thermal properties, crystal structures and relaxation processes of the samples were characterized by TGA, DSC, WAXD and DMA. When the melt-crystallized nylon 1211 samples are heated from room temperature to a higher temperature, the WAXD measurement indicates that the crystal structures of the samples transform from α-forms to γ-forms. Thermal stability of nylon 1211 was characterized using the TGA and DSC under nitrogen atmosphere.Nylon 1211 has good heat resistance and thermal stability. The DMA measurement shows that nylon 1211 has low-temperature flexibility and good cold endurance. Nylon 1211 not only possesses excellent mechanical properties but also has low water absorption, which make it suitable for uses requiring retention of mechanical properties and thermal properties under varying conditions of humidity.
  • WEI Yinping, ZHU Yuanmin, YANG Shanwu, ZHAN Qian
    Journal of Functional Materials. 2018, 49(4): 4112-4117. https://doi.org/10.3969/j.issn.1001-9731.2018.04.020
    Abstract ( ) Download PDF ( ) Knowledge map Save
    As one of the most promising candidate structural materials for fusion reactors, the irradiation damage behavior of vanadium alloys has been a research focus. Helium ions with 100 keV were adopted to irradiate V-4Cr-4Ti and China low activity martensitic (CLAM) steels at room temperature. Combined with selected area electron diffraction (SAED), X-ray energy dispersive spectroscopy (EDS) and electron energy loss spectroscopy (EELS), the microstructure especially the precipitate evolution before and after He+ irradiation has been investigated by advanced transmission electron microscopy (TEM). The results show that the precipitate present in the vanadium matrix is TiC with FCC structure and they grew along a specific crystal orientation. The length is about 200-1 000 nm. The irradiation of helium ion at room temperature induced lots of fine helium bubbles, ranging from 2 to 8 nm in diameter. Distinctly, large bubbles aggregated at the interface between the precipitate and the matrix. The lattice parameters did not change significantly before and after irradiation at the present conditions. Besides, compared with CLAM steel, V-4Cr-4Ti alloy demonstrated better performance of irradiation damage resistance.
  • XIAO Kunru, HOU Jiaqi, XU Yalan, YANG Ming
    Journal of Functional Materials. 2018, 49(4): 4118-4123. https://doi.org/10.3969/j.issn.1001-9731.2018.04.021
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Self-assembled CuS flower-like microspheres were successfully prepared by liquid-liquid interfacial reaction. The sample was analyzed by XRD, SEM, EDX and UV-Vis. The influence factors for degradation including the time of illumination, the concentration of solution, the pH, the dosage of CuS and the volume of H2O2 on the photocatalytic activity were studied. The results showed that the products were flower-like microspheres with an average diameter of 600-900 nm. The sample had good degradation for phenol, and the experimental data was described with the L-H (Langmuir-Hinshelwood) first kinetic model. Under the optimum conditions, the degradation ratios of phenol, catechol, m-dihydroxybenzene and hydroquinone were 68.54%, 85.31%, 79.56% and 94.99%, respectively.
  • GAO Jianming, LI Yinpeng, GUO Yanxia, CHENG Fanqin
    Journal of Functional Materials. 2018, 49(4): 4124-4127. https://doi.org/10.3969/j.issn.1001-9731.2018.04.022
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this paper, the preparation of spinel ferrites using limonite laterite ore and saprolite laterite ore as raw materials by acid leaching-coprecipitation-calcination and alkali leaching desilication-calcination methods was proposed. The effects of preparation methods on the structure and magnetic properties of as-prepared spinel ferrites were focused and investigated, which were characterized by X-ray diffraction (XRD), Fourier transfer-infrared spectrometry (FT-IR) and physical property measurement system (PPMS). The results showed that single phase of spinel ferrite could be obtained by both the two methods. Using acid leaching-coprecipitation-calcination method, Ni-Co-Mn co-doped magnesium ferrites were synthesized with NaOH solution as precipitant, while using alkali leaching desilication-calcination method, polymetallic ferrites with small amount of impurity SiO2 were obtained. The magnetic properties showed that all the as-prepared samples exhibited typical ferromagnetism. The synergistic effect of multiple metals and doping of a small amount of SiO2 (about 2%) could be beneficial to the enhancement and improvement of the magnetic properties.
  • XI Shouzhi, JIE Wanqi, WANG Tao, ZHA Gangqiang, WANG Aoqiu, YU Hui, XU Lingyan, ZHANG Hao, YANG Fan, ZHOU Boru, XU Yadong, GU Yaxu
    Journal of Functional Materials. 2018, 49(4): 4128-4133. https://doi.org/10.3969/j.issn.1001-9731.2018.04.023
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The CdZnTe films were deposited by radio frequency magnetron sputtering on the FTO substrate at different pressure of Ar range from 0.08 to 1 Pa. The sputtering target was prepared from Cd0.9Zn0.1Te ingot. The effects of Ar pressure on the morphology, structure, composition and electrical properties of CdZnTe film were investigated. As the decrease of Ar pressure, the evolution from column to sheet and then to particle morphology of CdZnTe films were shown. The grain size decreased from 180 to 50 nm. The deposited films possess stable cubic zinc-blende structure with (111) preferred orientation and the internal stress weakened as the Ar pressure decrease. The ZnTe and Te phase also occurred at the Ar pressure of 0.5 and 0.3 Pa. The composition of Zn and Cd was larger than that of target. The sheet resistance of CdZnTe film firstly decreased then increased as the Ar pressure decreasing, the carrier concentration and mobility showed opposite trend.
  • REN Ying, DU Bo, QIN Wenjuan, LIU Lingrong, ZHANG Qiqing
    Journal of Functional Materials. 2018, 49(4): 4134-4138. https://doi.org/10.3969/j.issn.1001-9731.2018.04.024
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Three different sequences of matrix metalloproteinases (MMP) sensitive peptides were designed and covalently crosslinked with hyaluronic acid which was modified with active group of maleimide to prepare a class of hyaluronic acid bionic hybrid hydrogel and then its effect on the cartilage differentiation of rabbit bone marrow mesenchymal stem cells (BMSCs) was studied. The hyaluronic acid (HA) was activated with (Sulfo-NHS) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC·HCl) as catalyst, then N-(2-aminoethyl) maleimide trifluoroacetate (AEM) was grafted with activated HA at room temperature to obtain HA-MAL. The addition reaction of the maleimide group with the mercapto group on the MMP-sensitive peptide could be carried out at room temperature. Covalently cross-linked MMP-sensitive peptide hydrogel has good mechanical properties, cells can be embedded in which for more than 4 weeks. The results show that compared with 2D orifice plate cells culture, hydrogels have different effects on the up regulation of COL1A2,COL2A1,ACAN and SOX9 gene expression, which can promote BMSCs to cartilage differentiation.
  • JIANG Meiqin, CHEN Bing, PAN Jing, LIU Xincai
    Journal of Functional Materials. 2018, 49(4): 4139-4143. https://doi.org/10.3969/j.issn.1001-9731.2018.04.025
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Effects of deformation temperatures, average platelet-grain length, single domain grain ratio and average thickness of platelet grain on coercivity of Nd14Fe80B6 die-upset magnets were investigated with X-ray diffraction, scanning electron microscopy and hysteresis loop instrument. The results show that when Nd14Fe80B6 die-upset temperature is 150-170 K above the melting point of its rich-rare-earth boundary phase, the coercivity of magnets decreases from 737 to 355 kA/m. The average platelet-grain length ranges from 320 to 500 nm and single domain grain ratio changes from 0.52 to 0.26. The increase of multi domain grains is the main cause of the coercivity decreasing. As the deformation temperature increasing or deformation time prolonging, the thickening velocity is higher than the length increasing speed of the platelet grains, resulting in the decrease of coercivity. If the deformation temperature is reduced near to the melting point, the coercivity of the die-upset magnets would be improved.
  • ZHOU Wenbin, LYU Ang, YIN Jilin, WANG Ruimin, ZHANG Jinhe, OUYANG Ai, LI Linjuan, WANG Xinlu
    Journal of Functional Materials. 2018, 49(4): 4144-4149. https://doi.org/10.3969/j.issn.1001-9731.2018.04.026
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A chitosan/gelatin composite membrane with good biocompatibility was prepared by using widely studied chitosan and gelatin as raw materials with genipin as crosslink agent. The composite membrane was subjected to drug loading with topotecan and radioactive labeling with iodine-131, study its performance including drug content, drug release, in vitro degradation and labeling rate. KM mice were intraperitoneally implanted with composite membrane to explore the in vivo degradation and biocompatibility of the composite membrane, and the KM mice were subjected to SPECT and CT imaging. Experiments show that the composite membrane simultaneously achieves labeling with radiotherapy drug iodine-131 and drug loading with chemotherapy drug topotecan. In vitro degradation of the composite membrane was slow and drug release was sustained. Through the KM mice intraperitoneal implantation experiments, the composite membrane showed the in vivo biodegradability and good biocompatibility.
  • JIN Na, YU Qiang, YANG Yanqing, LUO Xian
    Journal of Functional Materials. 2018, 49(4): 4150-4155. https://doi.org/10.3969/j.issn.1001-9731.2018.04.027
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Due to high melting point, high strength, strong oxidation resistance and deformation resistance at elevated temperature, refractory metal silicides have attracted extensively attention. In the refractory metal silicides, the tungsten-silicon binary compounds, where tungsten has the highest melting point, not only have the similar mechanical and physical properties compared to other metal silicides, but also show many other excellent performance characteristics. The theoretical investigation of tungsten-silicon binary compounds was presented by first-principles calculation to fully exploit the potential performance of tungsten-silicon binary compounds. Two prototype structures of WSi2 compounds and three prototype structures of W5Si3 compounds had been taken into account: α-WSi2 (C40), β-WSi2 (C11b), W5Si3-prototype structure (D8m), Cr5B3-prototype structure (D8l) and Mn5Si3-prototype structure (D88). The formation enthalpies were calculated to analyze the stabilities, and the elastic constants, bulk modulus, shear modulus, tensile modulus, Poisson’s ratio, anisotropy factor and Vickers hardness were calculated to obtain the mechanical properties. Otherwise, the total and partial density of states were also calculated to obtain the bonding mechanisms of tungsten-silicon binary compounds. The stability calculation indicated that the stability sequence of the five tungsten-silicon compounds forms the following order: β-WSi2>α-WSi2>W5Si3-prototype structure>Mn5Si3-prototype structure>Cr5B3-prototype structure, and the results of density of state further verified it. The calculation results of mechanical properties showed that the five stable phases of WSi2 and W5S3 with good shape, toughness and hardness are agreement with the mechanical stability. Among them, the shape, toughness and hardness of β-WSi2 are the highest, while those of Cr5B3-prototype structure are the lowest. The calculation of elastic constants showed that for α-WSi2, Mn5Si3-prototype structure, W5Si3-prototype structure and Cr5B3-prototype structure, the bondings along [100] and [010] directions are stronger than that along [001] direction, and the [100](010) shear is easier than [100](001) shear. On the contrary, for β-WSi2, the bondings along [100] and [010] directions are weaker than that along [001] direction, and the [100](010) shear is similar with the [100](001) shear. The results of total and partial density of states exhibited that the bonding mechanisms of these five compounds are all the mixture of strong covalent and certain metal bonds. In this paper, a new idea and theoretical foundation of new materials based on tungsten-silicon binary compounds will be provided.
  • ZHANG Weigang, YAO Dongmei
    Journal of Functional Materials. 2018, 49(4): 4156-4160. https://doi.org/10.3969/j.issn.1001-9731.2018.04.028
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Graphene modified polyurethane (PU)/bronze composite coating was prepared though scraping method by using bronze powders, polyurethane and graphene as functional pigments, adhesives and modifier, respectively. The effects of heat treatment temperature and time on the appearance, microstructure, infrared emissivity and adhesion strength of the prepared coating were systematically investigated. The results show that graphene modification can improve the heat conduction and heat dissipation effects of the coating, thereby improving the heat resistance of the coating. Compared with the unmodified coating, the appearance, microstructure, infrared emissivity and adhesion strength of the coating after graphene modification have higher thermal stability. The prepared graphene modified coating can be used long-term at 170 ℃, after heat treatment at 170 ℃ for 100 h. The appearance and microstructure of the coating remain unchanged, the emissivity can be as low as 0.216, and adhesion strength can be maintained at 1 grade.
  • LYU Qiang, YANG Chunli, MA Xinyu, YAN Min, CHEN Hong
    Journal of Functional Materials. 2018, 49(4): 4161-4165. https://doi.org/10.3969/j.issn.1001-9731.2018.04.029
    Abstract ( ) Download PDF ( ) Knowledge map Save
    BaCe0.7Y0.3-xTaxO3-δ (x=0.05, 0.1) proton conductor powder prepared by liquid phase method was pressed into disk-shape and then sintered at different temperature. The morphology, conductivity and chemical stability were studied. The results indicate that Ta doping can decrease the sintering activity of the high temperature proton conductor BaCe0.7Y0.3-xTaxO3-δ. However, the tolerance to boiling water and CO2 improves for BaCe0.7Y0.3-xTaxO3-δsamples with an increase of Ta-doping. The conductivity of BaCe0.7Y0.3-xTaxO3-δ increases with the temperature increasing. In addition, BaCe0.7Y0.25Ta0.05O3-δ shows the highest conductivity in dry air, while BaCe0.7Y0.2Ta0.1O3-δ has the highest conductivity in wet H2 90%+ 10% Ar (about 3% H2O) atmosphere.
  • WANG Jian, KONG Fangjun, JIAO Guanghua, TAO Shi, QIAN Bin, JIANG Xuefan
    Journal of Functional Materials. 2018, 49(4): 4166-4170. https://doi.org/10.3969/j.issn.1001-9731.2018.04.030
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Pyrite FeS2 and FeS2-RGO composites were synthesized by a one-step mixing solvothermal method, and their electrochemical properties as anode electrode materials for lithium ion batteries were investigated. Structure, morphology and electrochemical properties of materials were characterized by using X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), charge-discharge test, cyclic voltammetry (CV) and electrochemical impedance test (EIS). FeS2 samples delivered an initial discharge/charge capacity of 1 221.7/1 053.4 mAh/g and maintained a discharge capacity of 563.3 mAh/g after 50 cycles between 0.01-3 V at a current density of 100 mA/g. FeS2-RGO samples delivered an initial discharge/charge capacity of 1326.8/1057 mAh/g and maintained a discharge capacity of 1 239 mAh/g after 50 cycles between 0.01-3 V at a current density of 100 mA/g. The electrochemical performance of FeS2 can be effectively improved by graphene compsite.
  • Process & Technology
  • SUN Yao, GAN Zhanghua, JIANG Panhui, XIONG Xujin, LIU Bei, LU Zhihong
    Journal of Functional Materials. 2018, 49(4): 4171-4174. https://doi.org/10.3969/j.issn.1001-9731.2018.04.031
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Al-Ni nanofibers is fabricated successfully via selective etching of Al97.5Ni2.5 alloy with 10%, 20% and 30wt% NaOH, respectively. Composition and morphology of nanofibers were characterized by XRD and SEM. The dispersibility of nanofibers was tested in aqueous water. The results showed that the main phase of Al-Ni nanofibers was Al3Ni and part of fibers neatly arranged in certain direction with desired morphology.Compared with 10% and 20wt% NaOH, dispersibility of nanofibers with 30wt% NaOH selective etching was not good. Statistics indicated that the diameter of fibers were mainly distributed within 400 nm.
  • LI Xiangyu, LI Yude, DONG Xiaolu, JING Jiangfeng, QIE Jiankun, YU Baozhu
    Journal of Functional Materials. 2018, 49(4): 4175-4178. https://doi.org/10.3969/j.issn.1001-9731.2018.04.032
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this paper, MgO-adulterated-ZrO2/Ca3(PO4)2 composite material was fabricated by mould pressing and sintering. Mechanical properties of the composite are characterized by electronic universal-testing machine. The sintering behaviour, crystal structure and microstructure of the composite are characterized by thermal analyzer, thermal dilatometer, X-ray diffraction and Fourier transform infrared spectrometer, respectively. Results show that the MgO content increases with the increase of sintering temperature, leading to improved mechanical properties. With 10% adulterated MgO content, ZrO2 composite sintered at 1 400 ℃ displays optimum mechanical properties with Vickers hardness of 6 350 MPa and breaking strength of 25 MPa. Such performance is contributed by filled pores in the material by formed square ZrO2 phase and the liquid phase. At the same time, the presence of MgO suppresses the allotropic transformation of ZrO2.
  • WANG Congjie, CHEN Nuofu, WEI Lishuai, TAO Quanli, HE Kai, ZHANG Hang, BAI Yiming, CHEN Jikun
    Journal of Functional Materials. 2018, 49(4): 4179-4183. https://doi.org/10.3969/j.issn.1001-9731.2018.04.033
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The Ge films were deposited on the monocrystalline silicon substrate covered with graphite buffer layer by magnetron sputtering equipment, and then treated by rapid thermal annealing and conventional thermal annealing. The crystallization of the films under different annealing conditions were investigated by X-ray diffraction and Raman spectroscopy, and the effect of photons in the crystallization of the films was revealed. The results show that the photon quantum effect has both positive and negative effects on crystallization of germanium films.
  • LI Qingyu, LIAO Tao, LAI Feiyan, MO Renshan, WU Qiang, SHI Hongfeng
    Journal of Functional Materials. 2018, 49(4): 4184-4188. https://doi.org/10.3969/j.issn.1001-9731.2018.04.034
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In order to study the electrochemical performance of La0.7Sr0.3MnO3@LiMn2O4 (LLMO) cathode material at different heat annealing temperatures, the structure and morphology of La0.7Sr0.3MnO3 coating on the surface of spinel LiMn2O4 cathode materials were investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). And the electrochemical performances of the LLMO samples were tested by electrochemical tests via full cells (502030). The XRD results show that there is no other diffraction peak in the La0.7Sr0.3MnO3 coating with a mass fraction of 1.0 %, indicating that the La0.7Sr0.3MnO3 coating does not change the spinel structure of LiMn2O4 cathode material, because the atoms of coating material can only adhere to the surface rather than enter the spinel lattice. Heat annealing temperature has a significant effect on the electrochemical performance of the La0.7Sr0.3MnO3 coating. At the mid-temperature (500 ℃), TEM results exhibit a more uniform and continuous coating, and its thickness is about 80 nm. The electrochemical results indicate that LLMO sample exhibits a good initial charge-discharge efficiency and cycle stability. The initial charge-discharge (0.1 C rate) efficiency of pure LiMn2O4 is 85.97%, and the capacity retention rate is 82.09% after 400 cycles, while the initial charge-discharge efficiency of the sample annealed at 500 ℃ is 98.74%, and the capacity retention rate is 88.89% after 400 cycles. Thus, the La0.7Sr0.3MnO3@LiMn2O4 annealed at 500 ℃ has an excellent electrochemical performance, showing potential for high power applications in lithium ion batteries.
  • WANG Xiaorui, ZHANG Na, CHEN Ruoxiao, LIU Zhijun, WANG Zhanyong
    Journal of Functional Materials. 2018, 49(4): 4189-4192. https://doi.org/10.3969/j.issn.1001-9731.2018.04.035
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Bismuth ferrite (BiFeO3) powders were prepared by chemical co-precipitation method. The BFO precursors were prepared by using Bi(NO3)3·5H2O and Fe(NO3)3·9H2O as raw materials, dilute nitric acid as solvent and sodium hydroxide as precipitant. Then the BiFeO3 powders were obtained after calcination. The effect of pH value and calcining process on structure and photocatalysis of BFO was discussed. The powders were characterized by XRD and SEM. The results showed that when the pH value of the precipitation system was within the range of 8-11, the pure phase BFO powders were acquired by calcining for 2 h at 600 ℃. The pure phase BFO powders showed excellent visible light photocatalytic activity. The photocatalytic degradation rate was increased with the increase of crystal size of BFO.
  • WANG Haiwei, LIU Haoguang, WU Lei, HU Binbin, DU Zuliang
    Journal of Functional Materials. 2018, 49(4): 4193-4196. https://doi.org/10.3969/j.issn.1001-9731.2018.04.036
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Lithium carbonate crystallites with the orientation of the crystal type and symmetry of petal shaped morphology were fabricated below a BSA monolayer by using biomimetic method. The microstructure and surface topography of the obtained lithium carbonate crystallites were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD), and the formation mechanism was discussed. The results of characterization indicate that BSA LB film can be used as a template to induce and regulate the lithium carbonate crystallites to crystallize with a special growth orientation and complex morphologies.
  • LU Junliang, LU Ai, WEI Shilin, SUN Suming, WANG Xianzhong, YU Fengmei
    Journal of Functional Materials. 2018, 49(4): 4197-4202. https://doi.org/10.3969/j.issn.1001-9731.2018.04.037
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Based on solid rheometer and the principle of time-temperature equivalent, the effects of silica content and surface properties on dynamic mechanical properties of phenyl silicone rubber were studied through silica with two different surface characteristics as reinforcing fillers. The dynamic mechanical properties of silica reinforced silicone rubber in the low frequency and wide temperature (-80-25 ℃) and room temperature and wide frequency range (1-106 Hz) were within the scope of the results. The results showed that silica content and surface properties obviously influenced the dynamic mechanical properties of phenyl silicone rubber. Under the same conditions, H2000 reinforced silicone rubber had higher damping factor. At the same time, damping factor of phenyl silicone rubber is less than 0.3 with low frequency at room temperature. The damping factor of phenyl silicone rubber increased significantly with the increasing frequency, whose maximum can reach 1.17 at room temperature in the high frequency range (103-106 Hz).
  • HE Yaping
    Journal of Functional Materials. 2018, 49(4): 4203-4206. https://doi.org/10.3969/j.issn.1001-9731.2018.04.038
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this paper, graphene quantum dots were synthesized by hydrothermal method, and the synthesized ones were also characterized. Prepared process was in details as following six steps: (1) preparing graphene oxide by employing the improved Hummers method; (2)reducing graphene oxide by sodium borohydride and sodiumcitrate; (3)preoxidizing grapheme with sulfuric and nitricacid;(4) expanding treatment;(5) treating the above product by hydrothermal method;(6) dialyzing the solution for seven days to obtain the graphene quantum dots. Ultraviolet spectrum, fluorescence spectral, as well as the electrochemical and electroluminescent analysis was employed to character the final product. The result showed that the synthesized graphene quantum dots had good ultraviolet and fluorescence response signals and stability of the cheniluminescence.
  • ZHANG Zhaohui, WEI Shaoyang, LI Zongli
    Journal of Functional Materials. 2018, 49(4): 4207-4212. https://doi.org/10.3969/j.issn.1001-9731.2018.04.039
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Recycled tyre were breaked into powder with uniform particle size of 700 μm, then different amount of rubber powder were mixed with the rare materials for the manufacture of fly-ash aerated concrete blocks.Dry volume density, drying shrinkage, water penetration height, spliting tensile strength and compressive strength were studied.The results show that the dry volume density is reduced by 4.2%, tensile strength is increased of nearly 40%,compressive strength is increased of 4.7%, and permeability performance is improved significantly.The related properties can be well maintained in the 60 days curing cycle, and the longer the curing period is, the more obvious advantage is, indicating that rubber particles have good application prospects in the field of fly-ash aerated concrete block manufacture.
  • ZHANG Zekui, WANG Donghong, WANG Peng, LI Baoyi
    Journal of Functional Materials. 2018, 49(4): 4213-4216. https://doi.org/10.3969/j.issn.1001-9731.2018.04.040
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this paper, an ultrathin and wideband composite absorber is designed, which is based on resistance film and metamaterial. The absorber is composed of one order Minkowski fractal double square loop (MFDSL) electric resonator structure and two resistance film layers containing dielectric substrates. The two resistance film layers have different structure but with the same square resistance. The simulation analysis shows that the absorption of the composed structure absorber is greater than 90% in a frequency range of 1.2-20 GHz. The simulated absorptions under different polarization conditions and incident angles indicate that this composite structure absorber is polarization-insensitive and of wide-angle. And the thickness of this composed structure is just 1 mm. The further numerical simulation results indicate that the absorption of this absorber originates mainly from the absorbing mechanism of circuit resonance. The bigger square resistance, the better absorbing property is obtained.
  • HAO Shengzhen, WANG Yifei, REN Yaxuan, SUN Chunxin, MA Hongmei, XU Qin, SUN Yubao
    Journal of Functional Materials. 2018, 49(4): 4217-4220. https://doi.org/10.3969/j.issn.1001-9731.2018.04.041
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The microstructure of porous anodic alumina has an important effect on its optical properties. The porous anodic alumina thin films with special nested structure on the surface were prepared by improving the traditional two-step anodization method. The experimental results show that when the first anodization condition is different from the second one, the surface presents two different holes. The interpore distances are 100 and 270 nm respectively, and the microstructure appears in the form of a special nested structure. When the anodization conditions are the same, the surface morphology is a single hole. The pore growth model was established for two kinds of porous anodic alumina thin films, and the theoretical analysis was carried out. UV-Vis reflectance spectroscopy shows that there is blue-shifted in the porous anodic alumina thin films with large porosity on the surface. This study presents a new idea to prepare porous anodic alumina thin films with special surface morphology. The special porous anodic alumina thin films can be used in many areas, including coining process decoration and anti-counterfeiting applications,because of the particularity of their structure and the bright and pure color.