30 December 2017, Volume 48 Issue 12
    

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    Focuses & Concerns
  • LIU Yanbo,CHEN Ting,ZHENG Hongpeng,XU Biyi,DUAN Huanan, LIU Hezhou,WANG Ke,WU Yongmin
    Journal of Functional Materials. 2017, 48(12): 12001-12004. https://doi.org/10.3969/j.issn.1001-9731.2017.12.001
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    Solid state lithium-ion battery represents an important trend of battery technology. For the researching for the interface’s performance of solid state electrolyte, in this work, LLZO with different dopants (Ta, Nb, Sb and Te) was synthesized and the conductivity and interfacial resistance with lithium metal were compared. The ionic conductivity and interfacial properties under different temperatures were also investigated. The results show that the LLZO doped with Ta maintained the ionic conductivity of 5×10-4 S/cm and had the best performance in terms of the interfacial resistance. The EIS results showed that the interfacial resistance was decreasing with the increasing temperature, so that the LLZO would be one of the most promising solid state electrolyte.
  • WANG Aiping,ZHOU Aihua
    Journal of Functional Materials. 2017, 48(12): 12005-12010. https://doi.org/10.3969/j.issn.1001-9731.2017.12.002
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    Rod-like α-MnO2 nanostructures were prepared via hydrothermal process by using KMnO4 and MnSO4·H2O for different time. The effects of hydrothermal reaction time on physical and electrochemical properties of obtained MnO2 were studied by using X-ray diffraction (XRD), scanning electron microscope(SEM), specific surface measurement (BET), cyclic voltammetry (CV), galvanostatic charge-discharge method and electrochemical impedance spectroscopy (EIS). Results indicated that the crystallinity degree of MnO2 increased with the increasing of synthesis time. The α-MnO2 nanorods prepared by hydrothermal synthesis method showed fine capacitive behavior in 1 mol/L Na2SO4 solution. With the increasing of synthesis time, the specific capacitance increased to a maximum value and then decreased. The composite prepared by hydrothermal conditions for 24 h has the highest specific capacitance of 189F/g. The EIS tests showed that the MnO2 sample prepared via hydrothermal process for 24 h promoted the ability of faradic charger-transfer and the diffusion of ion on the interface between the active material particles and electrolyte, showing an excellent electrochemical performance and high specific capacitance.
  • YAN Hongbo,TAN Runhua,YANG Zezhong,HAO Hongbo
    Journal of Functional Materials. 2017, 48(12): 12011-12016. https://doi.org/10.3969/j.issn.1001-9731.2017.12.003
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    In the paper, patent literatures of giant magnetostrictive materials in engineering application were comparatively collected and analyzed through statistics, from the overall overview, IPC technology and patent map. Patent literatures of giant magnetostrictive material in engineering application were collected by keywords, and the data integrity and multiplicity of retrieval results were processed and verified to obtain complete patent literature. Based on the patent literature information extraction and data processing, the overview, the IPC distribution, the patent map technology, patent keywords, patent value and other aspects were overall analyzed. The global development status and trend of giant magnetostrictive materials in engineering application were studied. The research is crucial to the China's technology innovation and the patent strategy of giant magnetostrictive materials in engineering application.
  • CHENG Qi, TANG Shun, LIU Chang, ZHAO Jinxing, GUO Jinglong, LAN Qian, LIANG Jiyuan, YAN Ji, CAO Yuancheng
    Journal of Functional Materials. 2017, 48(12): 12017-12022. https://doi.org/10.3969/j.issn.1001-9731.2017.12.004
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    In this paper, the recent advances of Li4Ti5O12 as anode material for high power lithium-ion batteries in recent years were reviewed. For the problem of low conductivity of Li4Ti5O12, the research progress of improving its conductivity was reviewed as well. The modification of Li4Ti5O12 was discussed by means of the redesign of size and morphology, the doping of cation and anion, and the introduction of conductive carbon and metal elements. The influence on the electrochemical performance and the future development direction are described, and the development prospect of Li4Ti5O12 anode material is prospected.
  • SONG Liubin,LI Xinyu,XIAO Zhongliang,CAO Zhong,ZHU Huali
    Journal of Functional Materials. 2017, 48(12): 12023-12029. https://doi.org/10.3969/j.issn.1001-9731.2017.12.005
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    LiNi0.5Co0.2Mn0.3O2 cathode material with enormous energy density, higher capacity and lower cost has basically realized industrialization. But its comprehensive and rapid development are hampered attributed to its low retention rate and poor thermal stability. In this paper, the effects of preparation process optimization, doping and coating methods on the properties of ternary cathode materials are reviewed. The research status and application of thermoelectrochemistry and numerical simulation are introduced.
  • Review & Advance
  • CHEN Shuaichao,LUO Jianlin,LI Qiuyi,LI He,ZHANG Peng
    Journal of Functional Materials. 2017, 48(12): 12030-12035. https://doi.org/10.3969/j.issn.1001-9731.2017.12.006
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    In the contemporary, carbon nanotube (CNT) has become one of the most valuable materials with its particularity in mechanics, electromagnetics and chemistry. In this paper, the state-of-the-art of several typical functionalized modification processes of CNT and the application performance of this corresponding CNT-based composites were analyzed, and the possible main directions in the future were expounded.
  • CHEN Hui,LI Haili,GUO Mengxi
    Journal of Functional Materials. 2017, 48(12): 12036-12040. https://doi.org/10.3969/j.issn.1001-9731.2017.12.007
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    The research status, characteristics, application fields of the phosphate cementitious materials were summarized, the advantage and application prospect of this materials were pointed out, and the problems existed in the present research were analyzed.
  • WENG Li,MIN Yonggang
    Journal of Functional Materials. 2017, 48(12): 12041-12049. https://doi.org/10.3969/j.issn.1001-9731.2017.12.008
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    The traditional absorbing material is limited in application development, due to its large density, weak absorption strength and narrow absorption band. Graphene, as the allotrope of the carbon family, has a zero-band-gap structure with excellent electrical properties. Therefore graphene, as a dielectric loss type with absorbing mechanism, is combined with magnetic loss type composite material. The enhancement of wave absorbing properties of the absorber is achieved by the synergy of the two, which makes the current absorbing materials meet the performance requirements of "light, thin, wide and strong". In this paper, the preparation of graphene based absorbing composites, absorbing mechanism and absorbing properties were introduced, and the future development of graphene based absorbing composites was prospected.
  • LUO Jun, WANG Yanxiang,SUN Jian, GUO Pingchun,ZHANG Qifeng
    Journal of Functional Materials. 2017, 48(12): 12050-12059. https://doi.org/10.3969/j.issn.1001-9731.2017.12.009
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    Quantum dot-sensitized solar cells (QDSSCs) have attracted much attention in the past few years because of low cost, easy fabrication, size-dependence bandgap and multiple exciton generation (MEG) of quantum dots (QDs) and high theoretical photoelectric conversion efficiency (PCE). The counter electrode as an important part of QDSSCs is one of the key factors that influence the performance of QDSSCs. This review demonstrates the development of counter electrodes. Furthermore, the classification, preparation methods and the advantages and disadvantages of counter electrodes are introduced in detail. Finally, the future research direction of counter electrodes is prospected.
  • Research & Development
  • ZHANG Nizhen,HE Mengke,YU Peng,ZHOU Dahua
    Journal of Functional Materials. 2017, 48(12): 12060-12063. https://doi.org/10.3969/j.issn.1001-9731.2017.12.010
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    As a new two-dimensional material, graphene has attracted a lot of research interest due to its unique physical properties and potentialapplications. However, the low absorption coefficient of graphene limits its photodetection performance, which cannot meet the practical needs. The combination of graphene with CH3NH3PbIxCl3-x perovskitecan not only enhance the absorption, but also make full use of the high conductivity of graphene. Because of the wide absorption band and easy fabrication, perovskite materials were appliedas aphotodetector. The combination of graphene and perovskite detectorshows a high photo-responsibility of 0.66 A/W, which is more than 3 times higher than that of single layer graphenephotodetectors.
  • CHEN Hexiang,ZHAO Chunbao,XU Suichun,YANG Xujie
    Journal of Functional Materials. 2017, 48(12): 12064-12068. https://doi.org/10.3969/j.issn.1001-9731.2017.12.011
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    A series of thermally conductive and electric-insulating epoxy composites filled with boron nitride (BN) modified by octadecyl trimethyl ammonium bromide and graphene nanoplatelets (GNP) were prepared. The effects of modified-BN (BNOTAB) and GNP content on thermal conductivity, electric-insulation and thermal stability properties of epoxy composite were investigated. The results indicate that the BNOTAB can uniformly disperse into epoxy system. When the mass ratio of BNOTAB/GNP is 6:4 (total filler content is 10%), the thermal conductivity of the composites reached 0.48 W/(m·K), which is 108.7% higher than that of the neat epoxy. Meanwhile, the composite retains excellent electric-insulating property. TGA and DSC results show that the addition of BNOTAB/GNP filler particles can improve the thermal stability of epoxy resin composites.
  • ZHANG Lu,HE Xuan,CHEN Hui,ZHANG Wanqiu,ZHAO Lei,ZHAO Xiujian
    Journal of Functional Materials. 2017, 48(12): 12069-12073. https://doi.org/10.3969/j.issn.1001-9731.2017.12.012
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    Zn/Ni composite based bimetallic-organic framework compound with luminescence properties was synthesized by self-assembly of ligand terephthalic aicd and metal center Zn2+ and Ni2+ under solvothermal conditions. It was found that crystal structure of Zn/Ni-MOFs is similar to the MOF-5, but its morphology was a ”tremella” porous structure that different from the MOF-5, which has micro-mesoporous composited pore structure. The growth mechanism of product also was explored. In addition, photoabsorption and luminescence properties of Zn/Ni-MOFs were measured by ultraviolet spectrometry and fluorescence spectrometry. The results show that the product has strong luminescence properties at 425 nm wavelength, which is a kind of versatile functional materials.
  • ZHANG Jingjing,SUN Jie,LI Jigang, ZHOU Tian
    Journal of Functional Materials. 2017, 48(12): 12074-12079. https://doi.org/10.3969/j.issn.1001-9731.2017.12.013
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    Flower-like CeO2 support was prepared by hydrothermal synthesis. Au/CeO2 catalysts were prepared by deposition-precipitation method, using three precipitants NH4OH, Na2CO3 and NaOH. Their catalytic performance for CO oxidation reaction was investigated by means of ICP-AES, XRD, TEM, XPS and H2-TPR techniques. The results revealed that the Au/CeO2 catalyst prepared by using NaOH as the precipitant exhibited the lowest catalytic activity to CO oxidation, while the samples prepared by NH4OH and Na2CO3 showed higher catalytic activities, whose conversion rates at ambient temperature were greater than 95%, however, the activity of the latter was relatively higher. The activities of catalyst samples prepared by different precipitants were closely related with actual gold loading, gold particle size and difficult degree of CeO2 reduction.
  • LIU Zhangqi,TANG Wei,MA Chunyang
    Journal of Functional Materials. 2017, 48(12): 12080-12083. https://doi.org/10.3969/j.issn.1001-9731.2017.12.014
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    The Ni-TiN nanocoating was prepared on the surface of GCr15 steel by ultrasonic electrodeposition method in this paper, and the wear loss weight, surface morphology and phase composition of Ni-TiNnanocoatings were analyzed by means of friction and abrasion testing machine, micro electron balance, scanning electron microscope and X ray diffractometer. The results show that the Ni-TiNnanocoating obtained at ultrasonic power of 150 W exhibited a minimum wear loss of 1.1 mg. The average microhardness of Ni-TiNnano coating is 648.5 Hv, and the average friction factor is about 0.45. Ni-TiNnano coating mainly contains Ni, Ti, N and other elements, and the diffraction angles of Ni elements are located at 44.8,52.2 and 76.8°, while the diffraction angles of the TiN particles are at 36.7,42.6 and 61.8°, respectively.
  • ZHANG Wenhua,LIANG Ye,ZHOU Quan,LI Tong,LI Mingyu, MIAO Yu,XU Wenhua,WANG Liping
    Journal of Functional Materials. 2017, 48(12): 12084-12093. https://doi.org/10.3969/j.issn.1001-9731.2017.12.015
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    Chitosan is a natural cationic polysaccharide, which is often used for preparing biomedical materials because of its high biocompatibility. In this study, chitosan with different molecular weights was chosen to prepare chitosan nanoparticles (CSNPs) as gene vector by ionic cross-linking with tripolyphosphate (TPP). CSNPs were characterized in terms of particle size, zeta potential, polydispersity index (PDI) by the Zetasizer, and morphology was detected with transmission electron microscopy (TEM). Furthermore, the cytotoxicity and biocompatibility of CSNPs were correspondingly examined by MTT assay and the muscle slices of mice. The transfer effect on plasmids and siRNA was evaluated. Agarose gel electrophoresis method and spectrophotometry were used to detect the loading efficiency. The cell transfection efficiency of plasmids or siRNA loaded by CSNPs was analyzed by the fluorescence microscopy, laser scanning confocal microscopy or flow cytometry. The blood compatibility was analyzed by hemolytic experiment and full-automatic blood coagulator. Results showed that when CS(160 kDa) was 1 mg/mL with TTP(mass ratio was 10∶1), CSNPs were prepared successfully by ionic gelation method, which had smaller particle size (about 100 nm), stable dispersibility, high gene loading efficiency and spheroidal particles with morphological rules under TEM. Their cytotoxicity is at the 0-1 level, which is in line with the toxicity standard of biomedical materials. No obvious inflammatory reaction was found in the tissue section, showing good tissue-biocompatibility. CSNPs could transfer the plasmids or siRNA to cells with highloading rate. However, CSNPs might have much higher transfecting efficiency for siRNA than plasmids, which implied that CSNPs might be more suitable for being a safe and efficient vector for delivering siRNA than plasmids.The results of flow cytometry showed that the transfection rate was higher than that of commercial transfection reagents. Results also showed that CSNPs had good blood compatibility, so it can be applied as a safe and efficient siRNA delivery vector in cancer therapies.
  • DING Yongbo, LIU Youfa, LIU Yuqing, SHEN Liang
    Journal of Functional Materials. 2017, 48(12): 12094-12099. https://doi.org/10.3969/j.issn.1001-9731.2017.12.016
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    Aniline trimer (AT) was prepared by chemical oxidation and FT-IR and UV-visible spectroscopy were used to characterize its structure.Then the epoxy coating was prepared with aniline trimer as corrosion inhibitor, and the anti-corrosive property was evaluated by polarization curve, AC impedance spectrum and salt resistance test on Q235 steel. The results show that the solubility of aniline trimer in dimethyl sulfoxide is up to 37 mg/mL, andthe corrosion resistance of epoxy coating increased gradually with the increase of the content of aniline trimer in epoxy anticorrosive coating from 0 to 0.9%. Especially when the content of aniline trimer was 0.9%,no blister was found in the coating after 720 h cross scratch neutral salt spray test, and the rusted frontier around the scratch was less than 1 mm. Moreover, when the AT content was 0.9%,its inhibition efficiency was up to 97.8%, indicating its very nice anti-corrosion performance.
  • YANG Zhongzheng,ZHANG Ti,ZHANG Dewei,YAO Xianhua,LI Lei
    Journal of Functional Materials. 2017, 48(12): 12100-12103. https://doi.org/10.3969/j.issn.1001-9731.2017.12.017
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    La0.6Sr0.4Co1-xFexO3 perovskites (LSCF) were prepared using the nitrates of La, Sr, Co and Fe as main materials by sol-gel method, and its catalytic properties in the automobile exhaust smoke carbon particles (soot) were studied. The results show that the perovskite appears porous structure, particles are spherical and the particle distribution is uniform. The amount of forming perovskite and the spacing of its main crystal surface increase with the increase of substitution of Co by Fe. The Fe substitution is 0.4 to 0.8, which is favorable to the formation of perovskite. Compared with the soot without perovskite, the maximum combustion rate and perfect combustion temperature of soot with perovskite are greatly reduced. The catalytic effect of soot is improved effectively.
  • WU Shuping,DAI Xiangzi,SHILONG Fangdi,LI Jianan,WANG Wei
    Journal of Functional Materials. 2017, 48(12): 12104-12109. https://doi.org/10.3969/j.issn.1001-9731.2017.12.018
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    In recent years, antibacterial and antioxidant materials attracted increasing attention in the field of food industry, biomedical and environment engineering. A hemicellulose-glucosamine-Zn(Ⅱ) complex (HGZC) was developed via Maillard reaction. The HGZC was characterized by UV absorbance, browning intensity, fluorescence changes, FT-IR, XRD, antioxidant activity and antibacterial assessment were evaluated. Results showed HGZC is a Schiff base Zn(Ⅱ) complex and had amorphous structure. UV absorbance indicated Zn(Ⅱ) can inhibit the Maillard reaction between hemicellulose and glucosamine. HGZC had good antioxidant activity and the maximum DPPH scavenging activity was 85.6%. Meanwhile, HGZC exhibited excellent antibacterial activity. The synergy effect between polymer matrix and Zn(II) had greatly enhanced antibacterial and antioxidant activity of the complex.
  • GUO Fengjiao,LUO Jianmin,LI Zhiwei,CHEN Nannan,MI Hongyu
    Journal of Functional Materials. 2017, 48(12): 12110-12114. https://doi.org/10.3969/j.issn.1001-9731.2017.12.019
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    Granular polyaniline (PANI) is grown on multi-walled carbon nanotube (MWCNT) surface by in-situ polymerization route with the use of camphorsulfonic acidas the doping acid and ammonium persulfate as the initiator to obtain PANI/MWCNT composites. The composites are made into the working electrode and tested for investigating the capacitive properties in a three-electrode setup. With a current density of 0.5 A/g, its specific capacitance reaches 629.0 F/g that is distinctly higher than that of pure PANI (451.9 F/g). When cycled to 1000 times, PANI/MWCNT retains 74.4% of initial capacitance at a 5.0 A/g current density, but only 57.9% of initial capacitance is left for pure PANI, which indicates that the addition of MWCNT can enhance the capacitance and cyclic stability of PANI.
  • JIA Xingge,WANG Liqiang,SUN Xinxing,CHENG Xueyu
    Journal of Functional Materials. 2017, 48(12): 12115-12119. https://doi.org/10.3969/j.issn.1001-9731.2017.12.020
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    In this pater, glutaraldehyde was used as a cross-linking agent on the fish scale collagen modification. The effect of cross-linking agent on the mechanical properties and water resistance of tilapia scale collagen membrane was studied. The collagen film was characterized by the tensile strength, elongation at break, water resistance, water absorption and angle contact of the modified collagen membranes. The result showed that the factors influencing the mechanical properties of the collagen film were pH>temperature>glutaraldehyde. The factors affecting the water resistance of the collagen film were glutaraldehyde>pH>temperature. And when the dosage of glutaraldehyde was 8%, pH was 2.9, and the heating temperature was 40 ℃,the water resistance and mechanical properties of the modified film were the best. The tensile strength was 31.32 MPa, the elongation at break was 65.24%, the water resistance was 34.85%, and the water contact angle is 120.24°.
  • YANG Chen,ZHOU Xianliang,RAO Youhai,WEI Zhenkun
    Journal of Functional Materials. 2017, 48(12): 12120-12124. https://doi.org/10.3969/j.issn.1001-9731.2017.12.021
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    The precursor of powder materials applied in super-capacitor was prepared to obtain MnO2/nano carbon sphere composite powder by three different methods. X-ray diffraction (XRD), field emission scanning electron microscopy (FSEM) and specific surface area test (BET) were used to analyze the properties of composite powder. The electrochemical properties of composite powder were tested by cyclic voltammetry and constant current charge-discharge. Based on the experimental results, the powder keeping the feature of precursor showed good capacitive performance, and the retention rate of specific capacity were 80.3% and 88% respectively under the scanning rate of 5-50 mV. A sample of MnO2 coated activated carbon ball with network had the highest specific capacity of 122.6 F/g. Its reticular structure makes it have higher specific capacity and rate performance.
  • CHEN Hui,TIAN Yue,CUI Caie,HUANG Ping,WANG Lei,SHI Qiufeng
    Journal of Functional Materials. 2017, 48(12): 12125-12129. https://doi.org/10.3969/j.issn.1001-9731.2017.12.022
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    A series of Mn4+-Er3+ co-doped LaAlO3 near-infrared phosphors were synthesized by conventional high temperature solid-state reaction. The structure and luminescence properties were characterized by X-ray diffraction (XRD), fluorescence spectra and the fluorescence decay curves. The results show that when the Mn4+ is excited, the LaAlO3∶Mn4+/Er3+ phosphors exhibit strong near infrared emission of Er3+, which are corresponded to the 4I11/24I15/2 (990 nm) and 4I13/24I15/2(1 552 nm) of Er3+respectively, indicating that there is an efficient energy transfer from Mn4+to Er3+. The optimal Er3+doping concentration is 2mol% in the LaAlO3∶Mn4+/Er3+ phosphors. And it is observed that concentration quenching occurs with the continuous increase of Er3+doping concentration. It further reveals the existence of energy transfer from Mn4+to Er3+in the LaAlO3∶Mn4+/Er3+ phosphors by the fluorescence lifetime analysis of Mn4+ depended on the Er3+ concentration. Moreover, it is confirmed that a quadrupole-quadrupole interaction is responsible for the energy transfer mechanism from Mn4+ to Er3+.
  • YANG Yun,QIN Yimei
    Journal of Functional Materials. 2017, 48(12): 12130-12134. https://doi.org/10.3969/j.issn.1001-9731.2017.12.023
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    Supplemented by computer tools, the mathematical model was established by appropriate mathematical ideas with the neural network algorithm, which can solve the practical problems. Neural network as an auxiliary computing tools have be widely used in some mechanics performance prediction. Because of heterogeneity characteristics in micro-hardness data samples, a fuzzy cluster method and neural network were combined to forecast micro-hardness measurement in this paper. Fuzzy cluster analysis was applied to carry on the similarity training data classification, and BP neural network prediction model was established based on clustering samples. Similar data was chosen as training samples for each forecast model. The experimental values of micro-hardness of TiAl composites were taken as the research object, and the similarity between samples and clusters was used as the test standard for experimental verification. The value of MAE is 4.8157 and MSE is 5.0904, which show that the model is superior to the general prediction model.
  • CHENG Yue,XIAO Zhiguo,YU Hongwei,WAN Mengying,LU Mang
    Journal of Functional Materials. 2017, 48(12): 12135-12141. https://doi.org/10.3969/j.issn.1001-9731.2017.12.024
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    Fe3O4 as the magnetic core, coated with a layer of SiO2 in the middle, and cetyltrimethylammonium bromide (CTAB) as a template, mesoporous silicawas formed, and using 3-aminopropyl triethoxysilane (APTES) as a surface functional group, the surface of the mesoporous magnetic material is subjected to amino functionalization. The magnetic nanoparticles and core-shell magnetic nanocomposite particles were characterized by XRD, TEM and FT-IR.The adsorption performance of amino functionalized mesoporous magnetic nanoparticles on Cu(Ⅱ) in water was studied. The effects of the contact time, the pH value of the solution, the initial concentration and the amount of the adsorbent on the adsorption effect were investigated, and the adsorption kinetics and adsorption isotherm were studied. At the same time, the adsorption efficiency of the adsorbent with heavy metal ions was investigated by sonication after ultrasonic treatment.The results show that the second-order kinetic model is more suitable for describing the adsorption kinetics of Cu(Ⅱ) than the first-order kinetic model, indicating that the adsorption process is chemisorption. The adsorption of Cu(Ⅱ) can be carried out by Langmuir adsorption isotherm, which shows that adsorption is monolayer adsorption. The maximum adsorption capacity of Cu(Ⅱ) is 120 mg/g, when pH is 5.0 andthe contact time is 120 min.And the adsorption rate can reach 68.75%, after desorbed and regenerated for four times, indicating that the amino functionalized nanomaterials prepared in this paper have a high adsorption capacity, which is a kind of adsorbable material which can adsorb heavy metal ions in waste water efficiently.
  • WANG Jianji,LIU Tao
    Journal of Functional Materials. 2017, 48(12): 12142-12146. https://doi.org/10.3969/j.issn.1001-9731.2017.12.025
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    The polyimide and graphite filled PTFE composites were studied, and the composites and HT250 composites were matched. Using the MMU-10G friction and wear tester, the friction coefficient, wear rate and temperature of friction pairs were measured under different loads and different rotational speeds. Then, the surface of the specimen and dual parts was analyzed by JSM-5600LV scanning electron microscope. The results show that the tribological properties of filled PTFE were significantly better than that of pure PTFE. In the process of using polyimide and graphite filled PTFE composites, load and rotational speed had the limit value. When the load exceeded 300 N and the rotational speed exceeded 1 500 r/min, the friction coefficient and the volume wear rate were increased greatly. At the same time, when the surface temperature of the sample was more than 140 ℃, the transfer film formed by the composite material would be burned.
  • FAN Fei,YANG Fuxin,ZHANG Jiongjiong,QIU Yanna,DING Xiaotong
    Journal of Functional Materials. 2017, 48(12): 12147-12151. https://doi.org/10.3969/j.issn.1001-9731.2017.12.026
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    This work is aimed to research the effect on the properties of modified low density polyethylene (LDPE) resin antibacterial film by the addition of ethylparaben (ELN). The ELN-modified polyethylene antimicrobial film was prepared by blending and blow molding after adding ELN to the modified polyethylene and polyethylene. The effects the addition of ELN on the mechanical properties, optical properties, oxygen permeability, structure characterization and antibacterial properties of the films were studied. The results indicated that with the increase of ELN, the elongation at break increased firstly and then decreased, the transmittance decreased gradually, the haze increased gradually, the oxygen permeability and water vapor transmission coefficient of the film decreased firstly and then increased, and the thermal stability increased firstly and then decreased. When the mass fraction of ELN was more than 0.5%, the inhibitory effect on Escherichia coli and Staphylococcus aureus was significantly enhanced. The addition of ELN improves the comprehensive performance and antibacterial properties of the film, which is of great significance for the study of new packaging materials.
  • Process& Technology
  • LIU Jianfeng,YUAN Zizhou,LU Shisheng,ZHANG Xiangyun,CHEN Wenbin
    Journal of Functional Materials. 2017, 48(12): 12152-12155. https://doi.org/10.3969/j.issn.1001-9731.2017.12.027
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    The corrosion resistance of (Zr56Al16Co28)100-xNbx (x=0, 2, 4) metallic glasses at room temperature in Hank’s solution was systematically investigated. Electrochemical measurements indicate that the addition of niobium into Zr-Co-Al amorphous alloys improves the corrosion resistance in Hank's solution, and XPS demonstrates that the addition of alloys can increase the amount of Zr-enriched surface film, which is mainly responsible for the high corrosion resistance. Finally, the increased mechanism of Zr-enriched surface film has been analyzed after adding the Nb by the bond energy which had been calculated in the icosahedron model by the MS.
  • XIA Zhuoying,LIANG Qiaofa,ZHENG Mingyi,ZENG Guo
    Journal of Functional Materials. 2017, 48(12): 12156-12164. https://doi.org/10.3969/j.issn.1001-9731.2017.12.028
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    Silver doped cuprous oxide/zeolite composites with different amount of silver loaded were synthesized through complexation impregnation method with glucose as the reductant and nano cuprous oxide/zeolite as carrier, which were fabricated by a chemical coprecipitation method with glucose as the reductant and polyethylene glycol PEG400 as the template. Effects of doping content of silver on antibacterial properties and the structure of composites were investigated by using X-ray diffraction analysis and SEM method. The results show that the diffraction peaks of cubic Cu2O appeared on X-ray diffraction of zeolite/Cu2O samples with different silver doped amount, besides a few amount of the diffraction peaks of Ag with face centered cubic structure. The grain size of Cu2O decreased gradually, but the silver nano particle size increased with increasing loading amount of Ag. The diameter of bacteriostatic annulus and minimum inhibitory concentration (MIC) were determinated with filter paper method and multiple dilution method, by which the antimicrobial properties of cuprous oxide zeolite composite of different Ag doping amount were researched. The results show that silver loaded cuprous oxide/zeolite has certain antibacterial property for Staphylococcus aureus, Escherichia coli and Bacillus subtilis, in which the amount of silver loaded as 1%, 3%, 3%+2%, and when the amount of silver loaded is 3%, the antibacterial effect is strongest. The antibacterial effect of silver loaded cuprous oxide/zeolite with 3% of silver doping amount on Escherichia coli is more obvious, MIC of which is 7.2 μg/mL, yet MIC of Staphylococcus aureus and Bacillus subtilis are 24 and 18 μg/mL, respectively.
  • WANG Yueyou,BAI Xuelian, FAN Jia,LEI Qin,SHI Peiluo,SUN Hongjie,ZHAO Yunfeng
    Journal of Functional Materials. 2017, 48(12): 12165-12165. https://doi.org/10.3969/j.issn.1001-9731.2017.12.029
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    A high-performance cyanate ester system (R701 system) suitable for RTM process was developed and quartz/R701 composites were fabricated by the RTM technique. Viscosity dependence on time and temperature, DSC curve at different heating rates of resin, mechanical, dielectric, thermal and water absorption properties of resin and quartz/R701 composites were investigated. The results show that the viscosity of the R701 system is low at ambient temperature with suitable pot life greater than 24 h and thus meets the need of RTM techniques at ambient injection temperature. The resin’s dielectric constant is 3.0 and dielectric loss factor is 0.009. The composites’ glass transition temperature is 230 ℃. The dielectric constant is 3.4 and dielectric loss factor is 0.006, suggesting that this quartz/R701 composites fabricated by RTM process have great potential to be used as advanced structural/functional composite.
  • ZHANG Feng,LI Wei,YUE Meichen,DAI Shaojun,LU Rong, HOU Guihua,ZHU Fudong
    Journal of Functional Materials. 2017, 48(12): 12166-12170. https://doi.org/10.3969/j.issn.1001-9731.2017.12.030
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    Urea/straw-based superabsorbent composites were prepared by radical solution polymerization with acrylic acid as the monomer and K2S2O8-Na2SO3 as the initiator at room temperature. The materials were characterized by scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FT-IR). The SEM images show that flake-like straw powders and needle-like urea crystals are uniformly embedded in the matrix of the superabsorbent resin. The FT-IR spectra further demonstrate the formation of the composite of urea and straw-based superabsorbent. The urea content in the urea/straw-based superabsorbent resin can be easily controlled by the amount of urea in the reaction system. The water absorption of the urea/straw-based superabsorbent resins with the urea mass fractions of 10%, 30% and 50wt% is 318.0, 167.2 and 109.3 g/g, respectively. The results of water dissolution experiment and soil column leaching experiment show that the prepared urea/straw-based superabsorbent composites exhibit good slow-release performance and are promising in slow-release fertilizer.
  • HUANG Wei,LIN Jiaqi,YANG Wenlong
    Journal of Functional Materials. 2017, 48(12): 12171-12176. https://doi.org/10.3969/j.issn.1001-9731.2017.12.031
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    (BCZT) lead-free piezoelectric ceramics were prepared by solid-state sintering method. The effects of different dibasic pentoxide doping concentrations on the ceramic structure and piezoelectric, ferroelectric and dielectric properties were investigated. The experimental results show that BCZT lead-free piezoelectric ceramics with different doping amounts are typical perovskite structure, and the ceramic grains grow evenly. The doping of tantalum has a great influence on the growth of grains. Ba0.7Ca0.3) TiO3-0.52Ba (Zr0.2Ti0.8) O3, the inverse piezoelectric coefficient and the remnant polarization are both 0.3mol% Ta2O5, and the comprehensive performance is d33 of 489 pC/N, the piezoelectric coefficient is up to 657 pm/V at 2 kV/mm, Pr is 9.61 μC / cm2 and Ec is 0.237 kV/mm at 1 kV/mm.
  • LI Linxian,FENG Shan,CHEN Haoze,ZHANG Li
    Journal of Functional Materials. 2017, 48(12): 12177-12181. https://doi.org/10.3969/j.issn.1001-9731.2017.12.032
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    Electronic band structures, spin-polarized density of states and optical properties of (La0.75Ba0.25)-(Ag0.75Mn0.25)SO are discussed mainly by CASTEP module in Material Studio based on the first-principle calculation of density functional theory. It shows that (La0.75Ba0.25)(Ag0.75Mn0.25) SO is a direct semiconductor with a reduced band gap of 1.20 eV. The DOS presents asymmetry in the vicinity of Fermi surface, leading to obvious spin orders and ferromagnetism due to the p-d hybridization by Mn 3d and S3p. In case of the optical property, the reflection and absorption peaks locate at the ultraviolet band, especially in the 100-300 nm range. However, the value of the reflection and absorption is very small in the near infrared and visible bands. Therefore (La0.75-Ba0.25)(Ag0.75Mn0.25)SO can be used in high-transparency visible light field.
  • WU Junchen,SHEN Xiangdong
    Journal of Functional Materials. 2017, 48(12): 12182-12188. https://doi.org/10.3969/j.issn.1001-9731.2017.12.033
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    The frost and corrosion resistance of six types of aeolian sand concretes were studied through accelerated test method in three salt solution, and finally the damage laws of ordinary concrete and aeolian sand concrete were demonstrated. In addition, the damage mechanism of aeolian sand concrete under freeze-thaw and salt corrosion conditions was analyzed by using the testing measures such as, environmental scanning electron microscope (ESEM), analyzer of air void spacing, and nuclear magnetic resonance (NMR), etc. This result indicated that aeolian sand concrete is subjected to freeze-thaw in the salt solution, and the damage degree of concrete decreases in the order according to sodium sulfate and sodium chloride compound solution, sodium sulfate solution and sodium chloride solution.But the damage mechanism of freeze-thaw in 3 kinds of salt solution is different. Besides, in salt solution, the greater the amount of aeolian sand, the better the frost resistance. It provides theoretical basis for the aeolian sand concrete widespread application, the research of aeolian sand concrete under the influence of complex factors in low temperature and salt corrosion environment.
  • ZHAO Jianjiang,LI Hongfei,XIE Shuang,XU Mingsheng
    Journal of Functional Materials. 2017, 48(12): 12189-12192. https://doi.org/10.3969/j.issn.1001-9731.2017.12.034
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    Due to their unique mechanical, optical and electrical properties, two-dimensional (2D) layered materials such as graphene and transitional metal dichalcogenides (TMDs) have been gaining strong interests and they have great potentials for applications in flexible devices. However, the controllable synthesis is the prerequisite for their applications. Here, 2D MoS2 was synthesized by chemical vapor deposition (CVD) method. In this study, the influence of substrate placement on the synthesis of 2D MoS2 was investigated. The results show that under the same experimental conditions, the 2D MoS2 prepared by the substrate placement of face-up and face-down have different shapes and coverage rates. Despite these, the structure and the photoluminescence properties of the monolayer MoS2 achieved by different placements of the substrate are identical. The results would be helpful to design the procedures for controllable synthesis of TMDs.
  • YE Beirong,HUANG Miaoliang,FAN Leqing,LIN Jianming,WU Jihuai
    Journal of Functional Materials. 2017, 48(12): 12193-12199. https://doi.org/10.3969/j.issn.1001-9731.2017.12.035
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    In this paper, flake-like S doped NiTe was synthesized by one-step hydrothermal method. The phase and morphology of the materials were characterized by X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and field emission scanning electron microscopy (FESEM). The results show that the doping ratio of S to Te had a great influence on the electrochemical properties of NiTe∶S as the electrode material of supercapacitor. When the molar ratio of S∶Te was 3∶50, the specific capacitance of the electrode material at a current density of 5 A/g reached 887.3 F/g, which was increased by 214% compared to undoped one. Furthermore, the as-prepared NiTe∶S electrode (as positive electrode) was assembled with an AC electrode (as negative electrode) to form an asymmetric supercapacitor (ASC). The ASC exhibited an excellent electrochemical performance and the energy density and power density could reach 32.8 Wh/kg and 800.5 W/kg, respectively.
  • REN Lijun,ZHANG Gaini,WAN Yan,WEI Dan
    Journal of Functional Materials. 2017, 48(12): 12200-12203. https://doi.org/10.3969/j.issn.1001-9731.2017.12.036
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    By using polyvinyl alcohol (PVA) asstabilizer, polyaniline (PANI) nano-spheres with diameters of about 200 nm were prepared via chemical oxidative polymerization method.The composition, structure, and morphology of as-prepared electrode material were characterized by XRD, FT-IR, FESEM and TEM techniques. The capacitive properties of PANI nano-sphere electrode material for supercapacitor was investigated in three electrode system.The specific capacitance of the PANI nano-sphere electrode material was 494 F/g at the current density of 0.5 A/g.And the capacitance retention was 71% when the current density increases from 0.5 to 20 A/g.
  • WANG Yueming,SONG Yusu,SHEN Zhen
    Journal of Functional Materials. 2017, 48(12): 12204-12208. https://doi.org/10.3969/j.issn.1001-9731.2017.12.037
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    The carbon fiber field electric field detection electrode was prepared by concentrated nitric acid oxidation method. The underwater electric field response performance of prepared electrodes was characterized through an underwater electric field generating device. The results show that the carbon fiber electrode treated by concentrated nitric acid can accurately respond to the electric field signal of 1 mHz-10 Hz compared with the untreated carbon fiber electrode, and the linearity has improved nearly by 98%. The electrode under oxidation in concentrated nitric acid for 2 h has the best response performance in the view of both linearity and sensitivity.
  • LI Yingtao,LI Shengjuan,XU Bo,SUO Lulu, CHENG Zhihai,REN Guangpeng, ZHANG Li
    Journal of Functional Materials. 2017, 48(12): 12209-12213. https://doi.org/10.3969/j.issn.1001-9731.2017.12.038
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    NiFe2O4 and Ni0.5Zn0.5Fe2O4 spinel nanoparticles with good crystallinity were prepared by the synergy of the ultrasonic reaction and the chemical co-precipitation method. The microwave absorbing properties were improved by the Zn2+ doping. XRD and SEM analysis indicated that the NiFe2O4 and Ni0.5Zn0.5Fe2O4 flaky nanoparticles, with size of 30 and 70 nm, respectively, showed better crystallization with the increasing temperature. The exploration of static magnetic properties showed that the coercive force of samples decreased, while the saturation magnetization of the samples was reinforced via the Zn2+ doping. The testing results of the vector network analyzer showed that Zn2+ doping effectively improved the microwave absorption properties of NiFe2O4, and the wave absorbing properties were also strengthened with the increasing calcination temperature.
  • SHANG Xiaojuan,LIU Qibin,GUO Yaxiong,XU Peng,ZHOU Fang
    Journal of Functional Materials. 2017, 48(12): 12214-12220. https://doi.org/10.3969/j.issn.1001-9731.2017.12.039
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    In order to obtain high performance coating material, MoFeCrTiWAlNbx (x=1, 1.5, 2, 2.5, 3) high-melting-point high-entropy alloy coatings were prepared by laser cladding on W6Mo5Cr4V2AlA tool steel. The effect of Nb on the microstructure and properties of high-melting-point high-entropy alloy coatings was investigated by X-ray diffractometer (XRD), scanning electron microscope (SEM), microhardness tester and wear resistance tester. The results show that the microstructure of the coating consists of BCC phase, MC phase and a small amount of Laves phase, including the first eutectic and eutectic microstructure. With the increase of Nb content, the number of the first eutectic carbides decreases, but the size increases, and the particles phase change irregularly. The volume fraction of the eutectic microstructure increases with the BCC phase increasing and the (MC)e phase decreasing, and the eutectic microstructure gradually changes from small irregular particles + rod dendrites to bulk particles + network dendrites. The hardness of the coatings decreases gradually with the wear resistance increasing. The wear mechanism mainly consists of the adhesive wear and the abrasive wear in the coatings.