30 October 2016, Volume 47 Issue 10
    

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    Focuses& Concern
  • Modification of Li3V2(PO4)3 cathode material for lithium ion batteries
    LI Yuejiao, CAO Meiling,WU Feng
    功能材料. 2016, 47(10): 10001-10005. https://doi.org/10.3969/j.issn.1001-9731.2016.10.001
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In recent years, poly anionic phosphate cathode materials for lithium ion batteries are widely concerned by the researchers because of their stable structure and excellent cycling performance. Lithium vanadium phosphate has the theoretical capacity of 197 mAh/g. It has high energy density, high charge and discharge voltage platform and excellent thermal stability. Compared to other cathode materials, it has obvious advantages. But its electronic conductivity is low and not suitable for high current charge and discharge, which limits its practical application, we must carry on the modification research. Current modification methods include coating conductive materials on its surface, metal doping, controlling its morphology etc. In this paper, combined with the structure of lithium vanadium phosphate, we reviewed various modification methods and make a comparative analysis. Furthermore, combined with the research achievements of our team, the existing problems and the future research trend are discussed.
  • A review of composite of graphene and metal oxide applied for gas sensor
    FENG Qiuxia,WANG Jing,LI Xiaogan
    功能材料. 2016, 47(10): 10006-10012. https://doi.org/10.3969/j.issn.1001-9731.2016.10.002
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    This paper gives a review about the most recent progress in synthesis of composites of graphene and different metal oxides. Several advantages of composites of graphene and metal oxide such as increasing the response, making response/recovery process faster, lowering the working temperature etc. are emphasized. Possible reasons are analyzed for these improvements of sensing properites. The likely gas sensing mechanisms of composites of graphene and metal oxide are considered. To facilitate further research and development, the technical challenges are discussed, and several future research directions are also suggested in this review.
  • Effect of the nanocrystalline TiO2 film thickness on the performance of dye-sensitized solar cells
    SHEN Wei,ZHUANG Yuan, YU Fei,MA Jie,CHEN Junhong
    功能材料. 2016, 47(10): 10013-10018. https://doi.org/10.3969/j.issn.1001-9731.2016.10.003
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    The spraying methodwidely used in the preparation of TiO2 film. In our experiment, the TiO2 films with different thickness were prepared by controlling the spray time. The photoelectrochemical experiments were performed in a sandwich type two-electrode cell and I-V curves were obtained to investigate TiO2 film thickness on the performance of DSSCs. Result of solar cell test manifested that a enhanced short ciruit current is attributed to the increase of TiO2 film thickness, then the efficiency increases from 2.68% to 4.48%, showing a 66.76% improvement when the spraying time prolong from 2 to 6 min. Nevertheless, the efficiency displayed a small drop when we continued to increase the spraying time from 8 to 12 min.
  • Preparation and bioactivity study of glycosylated polymer film based on vinyl sulfone chemistry
    SUN Shiyou,LI Mingyang, WANG Hanqi, CHENG Fang
    功能材料. 2016, 47(10): 10019-10023. https://doi.org/10.3969/j.issn.1001-9731.2016.10.004
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    Glycosylation of polymer film is essential for mimicking the dense “glycocalyx” in biomembrane and development of biofunctional materials. In this study, a convenient method was developed to conjugate glycose onto poly(2hydroxyethyl methacrylate)(pHEMA) film using divinyl sulfone(DVS) as the coupling agent. A mannose glycosylated pHEMA film was prepared and characterized by Fourier transform infrared spectroscopy (FTIR). The reaction conditions were optimized using specific protein adsorption studies, and the bioactivity of the glycosylated film was assessed at protein and cell level. The protein level results show that the mannose glycosylated pHEMA film has good antifouling capabilities and can specifically recognize Concanavalin A (ConA). The cell adhesion experiment using macrophages (RAW 264.7) suggest that the glycosylated film is highly bioactive and low cytotoxic. The glycosylation of polymer film using DVS provides a neat approach for the construction of biomimetic membrane and researches on glycometabolism process at cell level.
  • Synthesis reaction mechanism of polyberylliumcarbosilane
    ZOU Yangjun,HUANG Xiaozhong,YANG Weijun,ZHAO Haoliang,
    功能材料. 2016, 47(10): 10024-10028. https://doi.org/10.3969/j.issn.1001-9731.2016.10.005
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    SiC ceramic fiber containing Be is a new kind of high performance fiber material,and high quality polyberylliumcarbonsilane polymer (PBCS) is an important guarantee for this kind of fiber. In this research, Be(acac)2 and PCS were used to synthesize PBCS to study the mechanism of synthesis reaction. Results of reactions between Be(acac)2 withPCS, Be(acac)2 with paraffin respectively showed that the reaction between Be(acac)2 and PCS is due to the Si—H bond rather than C—H bond. Besides, according to the products, we speculate the formation path of the PBCS chemical bond rationally.
    • Review & Advance
  • Research progress of wire-shaped flexible lithium batteries
    ZHANG Yanping,CHEN Yongchong,LIU Dandan,KANG Libin,ZHANG Ping
    功能材料. 2016, 47(10): 10029-10035. https://doi.org/10.3969/j.issn.1001-9731.2016.10.006
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    Compared with the bulk, thin-film,cylindrical or pouch-type flexible batteries, the wire-shaped flexible batteries have a combination of good bendable property, good twinning property, high energy density and stable capacity retention rate, which makes the circuit design more convenient, and as a result changes the energy supply mode of traditional batteries, and can maximumly utilize the free space inside the electronic devices.In the present paper, different theoretical designs, experimental procedures, advantages and disadvantages of various wire-shaped flexible lithium batteries in the world were reviewed and discussed. The main reasons that limit the industrial quantitative production of wire-shaped flexible lithium batteries were analyzed, and the prospects were also predicted.
  • Progress on research and technology of localized electrochemical deposition
    XU Chen,LIU Derong,LIU Lei,HU Wenbin,WU Zhong
    功能材料. 2016, 47(10): 10036-10043. https://doi.org/10.3969/j.issn.1001-9731.2016.10.007
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    Fabrication techniques for three-dimensional microstructures and nanostructures are limited by their high cost and low efficiency besides their dependence on environmental control, while the development of localized electrochemical deposition to a certain degree solved these problems. In this paper, process simulation and development and parameters optimization are discussed through the introduction of the concept and theory, the process control and the research status. In the end, the research emphasis and future trend are prospected according to the previous work.
  • Research progress in carbon electrodes for perovskite solar cells
    JIANG Xixi, JIN Yingxia, LIU Qingju
    功能材料. 2016, 47(10): 10044-10050. https://doi.org/10.3969/j.issn.1001-9731.2016.10.008
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    Due to its rapidly increased efficiency, simple preparation process, and low cost, perovskite solar cells have aroused widespread concern. In order to further reduce its cost on the basis of high photoelectric conversion efficiency, researchers replaced noble metal with carbon as counter electrodes, with energy conversation efficiency boosted from 6.64% to 15.03%. Based on applications of the carbon electrodes in the perovskite solar cells, the conductive mechanism, component, manufacturing methods and application of the carbon electrodes were discussed, and prospects of perovskite solar cells were assessed.
  • The progress of the superhydrophobic amorphous alloys surface
    LU Baiping, LI Xinbo, ZHU Zhijuan
    功能材料. 2016, 47(10): 10051-10058. https://doi.org/10.3969/j.issn.1001-9731.2016.10.009
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    The superhydrophobic surface originated from the lotus leaf has become one of the research highlights in the field of materials and bionics. By comparison with the organic polymer, the super hydrophobic metallic surfaces exhibit much higher durability. However, the “grain size effect” of the crystalline metals restricts the fabrication of surface micro/nano scale geometry. Due to the excellent forming ability in micro/nano scale of amorphous alloys in the supercooled liquid region, and the lower surface free energy as compared with the crystalline metals, amorphous alloys has been regarded as an ideal material to fabricate the superhydrophobic metal surface. In this work, the surface free energy of amorphous alloys with different compositions, the fabrication of micro/nano scale surface geometric structure, the influence of surface patterns on the hydrophobicity and the related mechanism are reviewed, finally the prospect of the superhydrophobic amorphous alloy surface is commented
    • Research & Development
  • Study on the NO removal activity and poison resistance of Ce-MnOx/TiO2-ZrO2 at low-temperature
    YUN Li,WANG Li,LI Qiang,LI Xin,ZHANG Ru
    功能材料. 2016, 47(10): 10059-10064. https://doi.org/10.3969/j.issn.1001-9731.2016.10.010
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    Using the sol-gel prepared TiO2-ZrO2 carrier, Ce(n)-MnOx/TiO2-ZrO2 composite catalysts were synthesized with critic acid solution impregnation method with manganese nitrate as MnOx precursor. The physical and chemical properties of catalysts were characterized with XRD, SEM-EDS and XPS. Meanwhile, its low-temperature catalytic activities as well as sulfur and water resistance were evaluated with selective catalytic reduction (SCR) of NO by NH3. The results show that there is an interaction between Ce-Mn oxide and TiO2-ZrO2 carrier, which leads to a crystallinity change in carrier. Comparing to the MnOx/TiO2-ZrO2, there is a higher Mn4+ content in Ce(n)-MnOx/TiO2-ZrO2. Furthermore, Ce in the Ce(n)-MnOx/TiO2-ZrO2 exists as Ce4+, Ce3+ state, which has the effect of transmission electron, ion and oxygen storage in the catalytic reaction, and then it improves the redox ability of catalysts. And ionization energy and electronegativity of Ce are much less than Mn. Therefore, Ce takes chemical reactions in preference to Mn. So the activity of Mn could be protected. The low temperature activity and antitoxic performance of Ce(n)-MnOx/TiO2-ZrO2 are superior to MnOx/TiO2-ZrO2. Among the prepared five catalysts with different molar ratios of Ce/Mn, Ce(0.2)-MnOx/TiO2-ZrO2 demonstrates the best performance owing to the best particle dispersion and the small particle size about 20 nm, and a 94% denitrification efficiency can be achieved at 80 ℃ and 100% at 100 ℃. When 5% H2O and 100 mg/m3 SO2 are simultaneously added, the denitrification efficiency decreases slowly and stabilizes at 85% after 210 min.
  • Surface modification of quartz tailing and its effecton strength and drying shrinkage of cement mortars
    CHEN Deng，DENG Min，HAO Chengwei，LAN Xianghui，MO Liwu 
    功能材料. 2016, 47(10): 10065-10069. https://doi.org/10.3969/j.issn.1001-9731.2016.10.011
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    The surface of quartz tailing was modified by calcination method through mixing with carbide slag. The mineral composition and microstructure of the modified quartz tailing were analyzed by using Xray diffraction (XRD), backscattered electron microscopy (BSEM) and energy dispersive spectrometer (EDS). The effects of modified quartz tailing on the drying shrinkage and compressive strength of cement mortars were investigated. The microstructure of cement mortars was analyzed by using BSEM and mercury intrusion porosimetry (MIP). The results show that the βC2S phases were formed on the surface of the modified quartz tailings. Due to the hydration of the βC2S, CSH gel was generated, the interface between cement paste and quartz tailing was densified, the porosity and drying shrinkage of cement mortars with the modified quartz tailing was decreased, and the compressive strength of cement mortars was increased.
  • Research of microscopic dynamic model for magneto-induced rheology
    SUN Lingyi,LIAO Changrong,WANG Fangfang,ZHANG Peng,JIAN Xiaochun
    功能材料. 2016, 47(10): 10070-10075. https://doi.org/10.3969/j.issn.1001-9731.2016.10.012
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    This paper presents a model to solve the uncertain problem of magnetic interaction mechanism, and the composition design of dispersed phase for magnetorheological (MR) glue under external magnetic field. Based on the microscopic magnetic dipole theory, a parallel plates single chain model for ferromagnetic particles in a magnetic field is established. Theoretical expression of shear yield stress for MR glue is obtained, on condition that the angle between magnetic chain and magnetic field direction satisfies exponential distribution law. By means of experimental data, the theoretical expression is optimized to better predict the yield stress under various influence factors. At last, the relationship between yield stress of MR glue and its influence factors (i.e., particle size, mass fraction, and viscosity) is analyzed, which provides a theoretical guidance for design and preparation of MR glue.
  • Preparation of elastin nano-fiber membrane via enzyme-catalyzed cross-linking
    HONG Yanqing, WANG Ping, ZHU Xueke, WANG Qiang, FAN Xuerong
    功能材料. 2016, 47(10): 10076-10080. https://doi.org/10.3969/j.issn.1001-9731.2016.10.013
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    Elastin has excellent properties of elasticity, stability and biocompatibility, and it could be used as a major composite biomaterial for tissue engineering. In the present work, the enzyme-catalyzed cross-linking of elastin was carried out by using tyrosinase and four mediators of phenolic compounds, followed by preparation of elastin nano-fiber membrane by using electrospinning method. The results indicated that tyrosinase could oxidize the phenolic mediators and the oxidation efficiency was highly depended on the sort of phenolic compounds. SDS-PAGE and size exclusion chromatography (SEC) analysis demonstrated that elastin could be cross-linked by tyrosinase in the presence of catechin or caffeic acid, resulting in an increase of molecular weight of elastin. Circular Dichroism (CD) data revealed that the enzymatic cross-linking led to the changes of the secondary structures, the content of α-Helix was increased. Modification of elastin with tyrosinase/catechin improved elastin’s spinnability, and the obtained nano-fibers exhibited uniform fineness and good biocompatibility as well.
  • Effects study of OP emulsifier on the electroless nickel plating coatings of piezoelectric ceramic
    XU Liwen, ZHOU Meijuan, ZHAO Linnan, HUANG Shifeng,
    ZHANG Ying, YUAN Xiao
    功能材料. 2016, 47(10): 10081-10085. https://doi.org/10.3969/j.issn.1001-9731.2016.10.014
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    The surfactant and plating technology played an important role in the process of electroless nickel plating. The experiment based on PZT-4 ceramic plating in the alkaline solution to obtain Ni-P alloy coating. The influence of OP emulsifier on PZT-4 ceramic surface chemical nickel plating was discussed. Using plating speed, coating corrosion resistance, surface morphology, element composition, electrical conductivity test, and the phase structure of plating technology to study the effects of temperature, acidity and OP emulsifier concentration on the properties of the coating. Results show that when the OP emulsifier concentration in plating solution is 15-25 mg/L, the coating has good performance, the best plating process condition range as follows: 40-45 ℃ as the plating temperature range, 8.5-9.0 as the pH value range.
  • The lubricating behavior of hybrid cross-linked double network PAAm/SA inmulti-valence metallic solution
    LI Han, LI Xuefeng, LONG Shijun, HUANG Dahua, LI Jian
    功能材料. 2016, 47(10): 10086-10090. https://doi.org/10.3969/j.issn.1001-9731.2016.10.015
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    Due to the high water content and excellent biocompatibility, Hydrogel is the ideal substitute for artificial cartilage. The mechanical property of hydrogels can be significantly improved by fabricating hybrid cross-linked double network. However the research is rarely reported on the friction mechanisms of hybrid cross-linked double network. Polyacrylamide/alginate (PAAm/SA) is fabricated and the elasticity modulus, swelling ratio and frictional behavior of PAAm/SA immersed in Na+, Ca2+ and Fe3+ was measured. The elasticity modulus of PAAm/SA in Fe3+ ionic solutions is 126 kPa which is 14 times of the PAAm/SA immersed in water. The frictional stress of PAAm/SA hydrogel significantly decreases over the entire range of sliding-velocity contrast to PAAm. The frictional stress of SA and PAAm/SA increased with the valences of ionic. When the solution turn from Ca2+ to Fe3+, the friction mechanism of PAAm/SA shift from mixed lubrication to boundary lubrication. Moreover, the sensitivities about the friction stress of PAAm/SA in Fe3+ to stress decrease with the slip rate increase.
  • The preparation and performance of PVDF hollow fiber heat capillary based on capillary wetting mechanism
    YU Jie, CHEN Huayan, GAO Qijun,WANG Pan, JIA Yue,
    WANG Xuan,WU Chunrui,LU Xiaolong
    功能材料. 2016, 47(10): 10091-10095. https://doi.org/10.3969/j.issn.1001-9731.2016.10.016
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    The heat exchangers of polymer material have the problem of low thermal conductivity. This paper proposes PVDF heat exchange capillary tubes based on capillary wetting mechanism. Namely PVDF heat exchange capillary tubes with porous structure were prepared by nonsolvent induce phase separation, the heat transfer process was intensified by wetting the air gap of the capillary surface, and their mechanical performance, internal porosity and structure were characterized. It is shown that heat transfer has been promoted by the air gap of the capillary surface. However, thermal transmission is hindered by the air gap of the capillary surface for the low conductivity of air. The air gap of the micropores in the tube wall would be filled up with water after the micropores of the tubes wall being hydrophilized which means that water in the micropores would form micro-convection by the temperature difference between two sides of the tube wall. Thus the heat transfer coefficient could be significantly improved. The total heat transfer coefficient of hollow fiber heat exchanger can be improved of 104% after being hydrophilized.
  • Synthesis of calcium carbonate @ octacalcium phosphate powderswith encapsulation of ibuprofen and its release behavior
    LI Chengfeng, LU Hao, YANG Lishuang, FANG Yanfeng, YANG Zhanzhong
    功能材料. 2016, 47(10): 10096-10100. https://doi.org/10.3969/j.issn.1001-9731.2016.10.017
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    Calcium carbonate with encapsulation of ibuprofen (CaCO3-IBU) was firstly prepared by a facile vapor diffusion method, and was then coated with a shell of octacalcium phosphate (OCP) through a modified Pechini process. The phase and morphology of CaCO3-IBU were significantly varied with the amount of IBU addition because the solubility of IBU after consumption of OH- ions influenced the solubility of CO2 gas, the generation of CO2-3 ions and crystallization of CaCO3-IBU. In phosphate buffered saline (pH=7.2-7.4) and lysosome-like buffers (pH=4.7), the release behavior of IBU from CaCO3-IBU@OCP was sensitivity with the pH value of culture solution and the structure of OCP shell, which was varied with molecular weight of PEG, amount of citric acid and polyethylene glycol addition. The mechanism for the improved sustained-release profile was caused by the interaction between ibuprofen and CaCO3, as well as the steric hindrance of core-shell structured drug delivery on the outward diffusion of IBU molecules
  • Study on compatibility of MXD6/PA6/EPT blends
    PENG Huaibing,LIU Xijun,LOU Chunhua,GU Xiaohua
    功能材料. 2016, 47(10): 10101-10106. https://doi.org/10.3969/j.issn.1001-9731.2016.10.018
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    In this paper, poly(m-xylene adipamide)/polyamide 6/ethylene propylene terpolymer(MXD6/PA6/EPT) blends were obtained by melt blending method,and EPT grafted maleic anhydride (MAH) was used as a reactive compatibilizer in this process. The dispersion performance of EPT and rheological property, morphological structure of MXD6/PA6/EPT blends were studied by Molau test, dynamic rheometer, scanning electron microscopy, FT-IR spectrometer and infrared near infrared imaging system. The experimental results showed that EPT-b-PA6 block copolymer was the root cause of compatibilizing MXD6/EPT blend system,which was generated by PA6 and EPT-g-MAH through situ chemical reaction.The energy storage modulus (G′), loss modulus (G″) and complex viscosity (η) of MXD6/PA6/EPT/EPT-g-MAH blend system were higher than MXD6/PA6/EPT blend system’s,and increased more obviously in low frequency area.The introduction of EPT-g-MAH improved phase separation temperature, broadened the scope of applications of time temperature superposition frequency and enhanced interface interaction between EPT and MXD6. Meanwhile,the dispersed phase EPT dispersed more evenly in MXD6 matrix and its size reduced significantly.
  • The theoretical calculation of molecular sieving effect about dioxide gas in Cu-BTC
    ZHAI Shangyu,LI Weixue,DAI Jianfeng,WANG Qing,CHEN Lijing
    功能材料. 2016, 47(10): 10107-10112. https://doi.org/10.3969/j.issn.1001-9731.2016.10.019
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    Configurational-bias monte carlo (CBMC) techniques were combined to simulate the adsorption density field about SO2, CO2 and NO2 at 298 K, 0.1-100 kPa in copper (Ⅱ) benzene-1, 3, 5 tricarboxylate (Cu-BTC). Density funational theory (DFT) were combined to explain the adsorption energy of the Cu-BTC’s structure unit for guest molecules (SO2, CO2, NO2). The research result shows that the structure unit of Cu-BTC had higher adsorption energy for SO2. With the comparison on adsorption process of three kinds of gases, further noted that The obvious molecular sieving effect of Cu-BTC for dioxide gas with the process of pure component sorption and mixture component adsorption is caused by the binding energies’ difference of structure and guest molecules.
  • Synthesis of hierarchical In(OH)3 and application in electrochemical sensing properties of uric acid
    HUANG Qingyou, HUANG Wei, XU Chufeng, WANG Bingrong, WANG Xiaohong,
    TU Jinchun, CAO Yang
    功能材料. 2016, 47(10): 10113-10117. https://doi.org/10.3969/j.issn.1001-9731.2016.10.020
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    Nanostructured Indium hydroxide (In(OH)3) was synthesized through a facile hydrothermal route without any polymer surfactants, which was applied to the non-enzymatic electrochemical detection of uric acid (UA). The results characterized from X-ray diffraction (XRD) and scanning electron microscopy (SEM) indicated that the powders owned good crystallinity and uniform hierarchical 3-D flower-like structure. The experiment results revealed that the obtained material exhibited good electrocatalytic activity for the detection of UA in sodium hydroxide solution. In addition, compared with In2O3, In(OH)3 showed higher electrode stability. The non-enzymatic electrochemical sensor was used in the detection of UA with a detection limit of 75 nmol/L(S/N = 3), a wide linear detection ranged up to 4.696×10-4 mol/L, a high sensitivity of 301.3 μA·mmol/L·cm2 and good selectivity toward UA
  • Electrochemical properties of layered composite electrode materials based on carbon fiber
    XU Jian, ZHOU Shenggang, ZHU Peixian, CAO Yong, HAN Zhaohui
    功能材料. 2016, 47(10): 10118-10123. https://doi.org/10.3969/j.issn.1001-9731.2016.10.021
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    In this paper, we successfully prepared a β-PbO2/carbon fiber (CF) Layered composite as an electrode. The thin β-PbO2 film was deposited onto carbon fiber by an anodic electrodeposition method. XRD, SEM and electrochemical workstation were used to study and characterize the structure, surface morphology and electrocatalytic activity of the β-PbO2/CF electrode. The weight and corrosion resistance between the traditional lead alloy electrode and β-PbO2/CF electrode were also compared. It is found that the carbon fiber cloth uniformly coated with β-PbO2. The β-PbO2/CF electrode possessed the lowest oxygen evolution potential and the best electrocatalytic activity at the current density of 40 mA/cm2 and the electrodeposition time of 100 min. Meanwhile, compared with the traditional lead alloy electrode, the weight of the β-PbO2/CF electrode was reduced by about 69.7%. Moreover, the β-PbO2/CF electrode has higher corrosion potential and lower corrosion rate. Thus, the β-PbO2/CF electrode is a promising electrode material attributed to its smaller weight, insolubilization and better corrosion resistance.
  • Preparation and fluorescence properties of lithium (borate, phosphate)silicate glasses doped with trivalent cerium
    CHEN Yanping, CHENG Hao, TANG Xianchen, LI Qiang
    功能材料. 2016, 47(10): 10124-10127. https://doi.org/10.3969/j.issn.1001-9731.2016.10.022
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    A novel lithium (borate, phosphate) silicate glass doped with trivalent cerium ions has been synthesized by using melt-quenching method. The UV-vis transmission spectra,photoluminescence excitation (PLE) and emission (PL) properties under excitation of UV-rays, have been investigated by UV-vis absorption technology, fluorescence spectroscopy technology. Results showed, with the addition of B3+, P5+ ions into Ce3+ ions doped lithium silicate glass, UV absorption cutoff edge, UV excitation and emission spectra showed an apparent redshift and blue-shift respectively, the intensity of excitation and emission spectra decreased.
  • Effect of temperature on the adsorption of TiO2 molecule on GaN(0001) surface
    LIANG Xiaoqin,ZHOU Jinjun,HUANG Ping,YANG Chun
    功能材料. 2016, 47(10): 10128-10133. https://doi.org/10.3969/j.issn.1001-9731.2016.10.023
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    The dynamics simulates of adsorption process of TiO2 molecule on GaN(0001) surfaces in 300, 400, 500, 600 and 700 ℃ temperature are studied by Ab initio molecular dynamics methods based on the first priciples. The energies of system, dynamic trajectories, the analysis of Mulliken populations, the surface bonding electron density distributions (ELF) and diffusion coefficients in the adsorption process are calculated and discussed. The results show that the bonding sequence of O and Ga atoms are different in the different temperature. The time of O2-Ga3 formation is the earliest and the rate of TiO2 adsorption on GaN (0001) surface is the highest in 500 ℃. The diffusion coefficient of TiO2 molecule in the physical adsorption stage in 600 ℃ in close to 100 times than that of 500 ℃. And the local charge distribution of ELF(0.750) of O-Ga1 in 500 ℃ is the most. The covalent bond of O-Ga1 bond is the strongest in 500 ℃. So the optimal temperature of TiO2 adsorption on GaN (0001) is 500 ℃.
  • The synthesis and luminescence properties of efficient Ba5Zn4Y8O21∶Er3+/Yb3+ upconversion phosphor
    ZHANG Nan,FU Yao,XING Mingming,LUO Xixian
    功能材料. 2016, 47(10): 10134-10137. https://doi.org/10.3969/j.issn.1001-9731.2016.10.024
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    A novel Ba5Zn4Y8O21∶Er3+,Yb3+ upconversion phosphor has been synthesized by solid phase method. XRD and SEM measurement results show that the phosphor crystalized well and presented granular appearance with average particle size of 1-5 μm. Under the excitation of 980 nm laser, extremely bright orange luminescence can be observed. Spectral test results confirm that the emission peaks are located in 520-530 nm, 530-550 nm and 650-690 nm. The green emissions originate from the populations of 2H11/2 and 4S3/2 energy levels, and the subsequent transitions to the ground state. The red emission is mainly related to the cross relaxation of 4I11/2(Er3+)+4F7/2(Er3+)→4F9/2(Er3+)+4F9/2(Er3+) and the reverse energy transfer of 4S3/2(Er3+)+ 2F7/2(Yb3+)→4I13/2(Er3+)+ 2F5/2(Yb3+), as well as the transitions of 4I13/2→4F9/2 and 4F9/2→4I15/2. Due to the cross relaxation and reverse energy transfer, the red emission intensity can be effectively improved and the green emission can be reduced, so that the red emission intensity can reach 6-13 times of the green emission intensity. The best doping concentration of Er3+ was 3mol% under the condition of 7mol% Yb3+ doping content. Improving the power density of excitation light can not only enhance the UCL, but also improve the intensity ratio of red and green light. Under high power excitation, the blue and blue-green emissions caused by three photon absorption can also be observed.
  • Anti-corrosion performance of dodecylbenzenesulfonate acid redoping polyaniline/epoxy-silicone composite coatings
    JIA Yifan, LIU Zhaohui, LIAO Zijun, YE Shengtian, WANG Fei
    功能材料. 2016, 47(10): 10138-10141. https://doi.org/10.3969/j.issn.1001-9731.2016.10.025
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    The epoxy-silicone composite coatings was prepared by the anti-corrosion pigment of dodecylbenzene sulfonate acid redoping polyaniline,mass fraction of it was 0.5%, 1.0%, 1.5%. SEM tests were carried out to observe dispersed state of different quantity of dodecylbenzene sulfonate acid redoping polyaniline in the epoxy-silicone composite coatings, and their anti-corrosion properties were studied by means of open circuit potential, electrochemical impedance spectroscopy and Tafel curves. The results indicated that the coatings with 1.0% dodecylbenzene sulfonate acid redoping polyaniline were uniformly dispersed and density, which had the best anti-corrosion performance on Q235 mild steel in NaCl (3.5wt%) solution.
  • Study on preparation and properties of TiO2 codoped with Boron and Sulfur
    YANG Rong, JIN Yingxia, GAO Honglin, LIU Qingju
    功能材料. 2016, 47(10): 10142-10147. https://doi.org/10.3969/j.issn.1001-9731.2016.10.026
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    B-S-TiO2 photocatalysts were synthesized by sol-hydrothermal method using tetrabutyl titanate, thiourea and boric acid as precursors and characterized by TG-DTA, XRD, FT-IR, UV-Vis and PL methods. The influences of different heat treated temperatures on properties were studied. The photocatalytic activity of B-S-TiO2 photocatalysts was investigated by measuring the degradation rate of methylene-blue (MB) under visible light irradiation. The results show that B, S codoping can not only inhabit the phase transition of anatase to rutile, restrain the growth of the grain but also broaden the absorption region to visible light and inhibit the recombination of the photo-generated electrons and holes. The photocatalytic activity of the sample with molar ratio of n(B)∶n(TiO2)=1∶25, n(S)∶n(TiO2)=1∶50 and calcinated temperature of 450 ℃ was the best under the irradiation of fluorescent light, it was 92.52% within 5 hours and significantly higher than that of Degussa P25(60.74%) under the same experimental conditions.
  • Effects of Fe amount on phases, morphology andmagnetic properties of
    DONG Peng,WANG Xia,LA Peiqing,WEI Yupeng,OU Yujing
    功能材料. 2016, 47(10): 10148-10152. https://doi.org/10.3969/j.issn.1001-9731.2016.10.027
    Abstract ( ) Download PDF ( ) Knowledge map Save
    NiZn ferrite ultrafine powder were prepared by combustion synthesis using Fe, NiO and ZnO as raw materials, NaClO4 as oxygen source and NaCl as diluent. The effects of Fe amount on phases, morphology and magnetic properties were systematically investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectrometer (EDS) and vibrating sample magnetism (VSM). The results showed that the size of annealed powders increased and size distribution became broader with the Fe content. After annealing, the crystalline structure of powders is more complete, the saturation magnetization of the powders reached its maximum value at 6 A·m2/kg when k is 0.7, while the coercivity obtain its minimum value at 16.29×79.6 A/m when k is 0.5.
  • The optical and electrical properties of a-Si∶H/a-SiC∶H multilayer films
    JIANG Bing, DING Ning, CHEN Yihao, MA Lei
    功能材料. 2016, 47(10): 10153-10156. https://doi.org/10.3969/j.issn.1001-9731.2016.10.028
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    The a-Si∶H/a-SiC∶H multilayer film was prepared on the monocrystalline silicon and quartz substrates by radio frequency plasma enhanced chemical vapor deposition technique(RF-PECVD), using SiH4,CH4 and H2 as reaction gas sources. The microstructures of a-Si∶H/a-SiC∶H samples characterized represented using transmission electron microscope(TEM).At the same time, the electrical transport and optical absorption properties of a-Si∶H/a-SiC∶H multilayer films were experimental studied. The results show that the multilayer film samples were amorphous multilayer film with good periodic structure and steep interfaces. At room temperature, sequential resonant tunneling peculiarities on the vertical direction of multilayer film samples were observed. When well layer thickness of a-Si∶H is smaller than 8 nm, the optical band increase and optical absorption coefficient decrease with the decreasing of well layer thickness, which results from quantum size confinement effect.
  • Wear characteristics of ZK61 magnesium alloy
    HU Yaobo, YANG Shengwei, MENG Wanqiu, YAO Qingshan, PAN Fusheng
    功能材料. 2016, 47(10): 10157-10161. https://doi.org/10.3969/j.issn.1001-9731.2016.10.029
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The effect of the load, sliding speed and time on the wear behavior of the ageing ZK61 magnesium alloy was investigated by setting different parameters in this paper. The wear tests were carried out using the MDW-02 high speed reciprocating friction and wear testing machine. Microstructures of worn surfaces were characterized by scanning electron microscope (SEM) and wear mechanism map of the studied alloy was proposed. The results show that, wear mass of ZK61 magnesium alloy both increase with wear time and applied load under the conditions of a sliding speed of 0.12 m/s, and the transformation of mild wear to severe wear is in 120 N and 60 min. Moreover, the wear mechanism of ZK61 magnesium alloy changes with the increase of the applied load and sliding velocity under the conditions of a fixed wear time 20 min. Low sliding velocities led to mild wear regardless of the load used. Intermediate speeds the main mechanism changed from mild wear to severe wear at the applied load exceeded 100 N. At high speeds led to severe wear mechanism under the all applied load.
  • The effects of viscoelastic material on the band gap of one-dimensional locally resonant phononic crystal
    ZUO Shuguang, WEI Xijin, NI Tianxin, WU Xudong
    功能材料. 2016, 47(10): 10162-10167. https://doi.org/10.3969/j.issn.1001-9731.2016.10.030
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Phononic crystals are artificial periodic composite structure with phononic band gap. As common phononic crystals constituent materials, the viscoelastic property of the rubber material is rarely taken into account, but it has a major impact onphononic crystal band gap characteristics. This paper studies the band gap properties of phononic crystal considering the viscoelasticity of the rubber materials for the purpose of studying phononic crystal features in the practical application so that we can have a better application of its vibration control characteristics. The shear modulus relaxation parameter is derived and transformed into the finite element model in Abaqus. The finite element model considering viscoelastic property is thus proposed and employed to analysis. According to the comparison and analysis of the influence on different forms of phononic band gaps after considering the viscoelasticity, it is found that the material viscoelasticity has the influence on the location and width of band gap and will weaken the attenuation ability of the band gap.
  • Fabrication and formation mechanism of iron oxide nanotubes arrays on carbon steel by anodization
    DENG Hongda,CAO Xianlong, TANG Xiao
    功能材料. 2016, 47(10): 10168-10172. https://doi.org/10.3969/j.issn.1001-9731.2016.10.031
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    Thin films consisting of highly self-organized nanotube arrays were fabricated on carbon steel substrate in an aqueous ethylene glycol solution containing fluoride by anodization. It has been investigated by SEM that several synthesis parameters, such as anodizing voltage, anodizing time, concentration of fluoride ion and temperature affected on the morphology of the film comprising nanotube arrays and tube size. XRD and XPS techniques have been used to characterize the nanotube arrays film. Results show that anodization voltage and concentration of fluoride ion are the key factors to effect on the morphology of the film and tube size. The nanotube structured film forms between 30 and 60 V, and in the range of 0.03 and 0.1 mol/L NH4F. The average pore diameter of the tubes increases with the increases of the anodization voltage and concentration of fluoride ion. Temperature only has an influence on the rate of tube formation of flim. Amorphous film transforms into the crystallized film composed of predominant hematite phase and minor magnetite phase. Finally, the possible growth of nanotube arrays was also proposed.
  • Research on removal of simulated uranium contamination by KGM acetate
    CHEN Yunxia,LIN Xiaoyan,LUO Xuegang,SHANG Ningning
    功能材料. 2016, 47(10): 10173-10179. https://doi.org/10.3969/j.issn.1001-9731.2016.10.032
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A kind detergent of KGM acetate (KGMA) was prepared from Konjac glucomannan (KGM), and applied to remove simulated uranium U(Ⅵ) contamination on the surface of various material. The influences of the concentration of KGMA, pollution time, initial content of U(Ⅵ) and temperature on removal rate were studied, and the decontamination mechanism of was analysed with SEM-EDX and XPS. The thermal decomposition characteristics and products of the decontamination film were studied by means of thermogravimetric analysis (TG) coupled with Fourier transform infared spectromotry (FT-IR). The results show that four kinds of materials have remarkable removal effect for U(Ⅵ) on the surface. When the environment temperature changes at 10-40 ℃, the decontamination rate of the four materials is 90%-99%. The mechanism of the removal of U(Ⅵ) by KGMA detergent is the combination of physical and chemical interaction. The main gaseous products from thermal decomposition of KGMA decontamination film at high temperature were H2O, CO2 and CO, no other toxic and harmful substances was detected.
    • Process& Technology
  • Preparation of ferrihydrite nanoclusters using hydrolysis
    LIN Lihua, ZHOU Qun, PU Shengli
    功能材料. 2016, 47(10): 10180-10183. https://doi.org/10.3969/j.issn.1001-9731.2016.10.033
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A new method of preparing Ferrihydrite(Fe5O7(OH)·4H2O) nanoclusters using Fe(NO3)3 solution hydrolysis enhanced by CuO. Ferrihydrite nanocrystals during precipitation will gather to form Ferrihydrite nanoclusters. The morphology and size, magnetization, crystal structure and chemical composition of the precipitated products were characterized by TEM, VSM, XRD, EDX and XPS. The results show that the product is weakly magnetic nanoclusters, the size of nanoclusters are about 40 nm gathered by about 6.13 nm Fe5O7-(OH)·4H2O nanocrystallites, and the surface of the nanoclusters are absorbed by Fe(NO3)3. A new method of preparing nano-sized iron oxide using hydrolysis enhanced by CuO is proposed.
  • Analysis on heat transfer mechanism of diamond/Al composites fabricatedvia hot pressing sintering and pressure infiltration
    CHEN Peijia, ZENG Congyuan, CHEN Feng, YU Xinquan
    功能材料. 2016, 47(10): 10184-10188. https://doi.org/10.3969/j.issn.1001-9731.2016.10.034
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this paper, diamond/Al composites are prepared via the route of vacuum hot pressing sintering and pressure infiltration, the thermal conductivity (TC) of which reaches 410-420 W/(m·K) and 673 W/(m·K) respectively. Based on the analysis of heat transmission mechanism in the composites, a parameter “contribution rate of diamond bridging” is defined to quantify the contribution of diamond bridging to the increase in TC of the composite. It is shown that the higher TC of the composite prepared by pressure infiltration method can be attributed to the following factors: higher volume fraction of diamond particles, lower interfacial thermal resistance between diamond/Al, and especially the effect of diamond bridging which constitutes lots of passageways for fast heat transmission.
  • Influence of oxidant concentration on 4H-SiC chemical mechanical polishing result
    GAO Fei, LI Hui, XU Yongkuan
    功能材料. 2016, 47(10): 10189-10192. https://doi.org/10.3969/j.issn.1001-9731.2016.10.035
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this paper, the processed surface morphology and composition of 4H-SiC were studied by atomic force microscopy and X-ray photoelectron spectroscopy, thus, the effect of oxidant concentration on the material removal rate, together with microstructure of SiC substrates, were discussed. The polishing results indicated that SiC could be oxidized to SiO2 layer during the process of CMP, while the concentration of the oxidant had a distinct influence on the oxidation process. The removal rate could reach up to about 1 200 nm/h when the oxidant concentration was 0.15 mol/L, moreover, a scratch-free, ultra-smooth polished surface with atomic step structure morphology was obtained, with an extremely low Ra of 0.0853 nm level.
  • Effect offlow velocity and particle size on the erosion of QAl9-4 aluminum bronze
    HUANG Weijiu, LIU Chenglong, LI Zhijun, WANG Junjun, LIAO Zhikang
    功能材料. 2016, 47(10): 10193-10197. https://doi.org/10.3969/j.issn.1001-9731.2016.10.036
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The erosion of QAl9-4 aluminum bronze has been investigated in 3.5% NaCl including SiC particles by using a rotating disk system. The results show that the mass loss increases with increasing the flow velocity when the velocity is lower than 28.3 m/s, and the mass loss vs particle size exhibits an transition point beyond which the mass loss decreases obviously, which is 0.3 mm. The variations of particle size can lead to the change of the erosion behavior of QAl9-4 aluminum bronze samples. The failure of samples is mainly attributed to the ploughing wear under condition of little particles, however, the forging and extrusion effect improves and the ploughing wear decreases under condition of big particles.
  • Removal of methyl orange using polypyrrple/attapulgite composites doped with mixed acids
    CHEN Yong, WANG Shiyu, KANG Guiying
    功能材料. 2016, 47(10): 10198-10202. https://doi.org/10.3969/j.issn.1001-9731.2016.10.037
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Doped with hydrochloric acid and p-toluenesulfonic acid PPy/ATP composites were prepar-
    ed by situ polymerization method.The structure of the composites was studied and characterized by Scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR). The results indicated that the surface of ATP was covered with PPy microsphere to form a rough surface and the spectrum of PPy/ATP composites is consistent with PPy except for the intensity of some peaks. The effect of adsorption time, adsorbent dosage, pH and initial concentration was investigated. The optimum conditions were found to be: an initial concentration of 35 mg/L, contact time of 4 h, pH and temperature of 7 and 45 ℃ respectively. The experimental data fited well with the pseudo-second-order kinetic model and Langmuir equation, and the maximum adsorption capacity reached up to 143.07 mg/g.
  • Synthesis of double-crosslinking PUEA composite emulsion
    ZHU Keke, ZHANG Xudong
    功能材料. 2016, 47(10): 10203-10207. https://doi.org/10.3969/j.issn.1001-9731.2016.10.038
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A double crosslinking PUEA emulsion which was used for metal anti-corrosion was successfully synthesized by pre-polymerization method using CYD-014 as pre-crosslinking agent, GMA as post crosslinking agent, and TDI,GE-210,DMPA,MMA as the main raw materials. The effects of the GMA content on the properties of the emulsion and the film were discussed. Additionally the crosslinking curing process of the film was researched. Experimental results showed that the dosage of GMA had an important effect on the properties of PUEA emulsion and film. The emulsion had good performance and stability when the GMA content was 3%. The baking film was endowed with excellent hardness, impact resistance, and the anticorrosion performance. Meanwhile the film had the lowest rate of water and ethanol absorption. The film properties of the post crosslinking PUEA were closely related to the baking temperature and baking time. The suitable film forming condition was 150 ℃/20 min
  • Preparation optimization of Cr3+ doped TiO2 powder by chemical precipitation
    ZHAO Chenxu, DU Jinghong, YAN Jikang, ZHANG Jiamin, LIU Yichun,
    GAN Guoyou, YI Jianhong
    功能材料. 2016, 47(10): 10208-10212. https://doi.org/10.3969/j.issn.1001-9731.2016.10.039
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Cr3+ doped TiO2 powder was prepared by chemical precipitation and the technique was optimized by orthogonal experiment. The structure, surface state and light absorption properties of TiO2 powders were characterized by XRD、XPS and UV-Vis. The results showed that the effect of the amount of Cr3+ on optical absorption properties of TiO2 were significant. With the rising of Cr3+ amount, optical absorption properties of TiO2 increase and band gaps decrease. Cr3+ partially substitutes Ti4+ and promotes the phase transformation from anatase to rutile. In addition, a certain amounts of hydroxyls are also adsorbed on the surface of TiO2 due to Cr3+ doping. The optimal conditions of Cr3+ doped TiO2 powder were as follows: the amount of Cr3+ is 1.0mol%, the calcinated temperature is 500 ℃, the solution temperature is 70 ℃ and the pH value is 10.0. TiO2 powder prepared under the above conditions had the optimal visible light property.
  • Preparation of benzoxazine based on methylcyclopentyl diamine and comparison of thermal stability of its curing system with epoxy
    YUAN Wei,SHI Tiejun,LI Ming,QIAN Ying,CHEN Yang
    功能材料. 2016, 47(10): 10213-10217. https://doi.org/10.3969/j.issn.1001-9731.2016.10.040
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Two different containging-cyclopentana benzoxazine (abbreviated as TPBz and TNBz) were synthesized in this paper, and the raw material phenol (Ph) and nonylphenol (NP) were used to take the Mannich reaction with paraformaldehyde and methylcyclopentyl diamine (TAC), respectively. The chemical structure of TPBz and TNBz was characterized by FT-IR and 1H NMR. Then blending TPBz and TNBz with epoxy resin and curing, which were compared with the blend curing system of material TAC and epoxy resin. The blend characteristics of curing system were studied by DSC, and the thermal stability of which was analyzed by TGA. The result demonstrated that the thermal decomposition temperature of TPBz/EP increased 32 ℃ than that of TAC/EP. the temperature of maximum weight loss rate increased 58 ℃, and the carbon residue at 700 ℃ increased 11.2%,respectively. About TNBz/EP, its thermal decomposition temperature increased 42 ℃, and temperature of maximum weight loss rate increase 56 ℃.
  • The research on PMIA nanofibers via solution blow spinning
    LI Chao,YU Junrong,WANG Yan,ZHU Jing,HU Zuming
    功能材料. 2016, 47(10): 10218-10224. https://doi.org/10.3969/j.issn.1001-9731.2016.10.041
    Abstract ( ) Download PDF ( ) Knowledge map Save
    PMIA nanofibers were successfully prepared by solution blow spinning. The effect of spinning parameters, including PMIA solution concentration, gas pressure, injection rate and receiving distance on the morphology and nanofibers diameter were investigated. The results showed that PMIA nanofibers had good surface morphology and fine fibre diameter (276.7 nm) when solution concentration, gas pressure, injection rate and receive distance are 12wt%, 0.12 MPa, 0.8 mL/h and 40 cm, respectively; Aligned PMIA nanofibers were prepared using a high rotating cylinder as acollector. The effect of rotating speed on PMIA nanofibers membrane performance was studied. The results indicated that orientation degree of nanofibers and the mechanical properties all increased as the rotating speed was raised. The peak values appeared in 1 300 r/min and then decreased over 1 300 r/min. Furthermore, the porosity of membrane decreased when the rotating speed was raised but the porosity was still higher than 79.7%.
  • Preparation and photo-catalytic performance of Bi2O3/RGO composite catalysts for the reduction of carbon dioxide
    LI Xin,WANG Li,ZHANG Ru,YUN Li,LI Qiang
    功能材料. 2016, 47(10): 10225-10229. https://doi.org/10.3969/j.issn.1001-9731.2016.10.042
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Ammonia precipitation and improved Hummer method were used to prepare Bi2O3 and GO respectively. Bi2O3 were dissolve into appropriate concentrated GO solution followed by preparation of Bi2O3/RGO composite catalyst using UV reduction method. XRD, SEM, EDS and BET were employed to characterize the photocatalysts. Meanwhile, the photocatalytic capacity was evaluated by performing photocatalytic reduction of CO2 under ultraviolet light. The results indicated that GO was efficiently reduced to RGO under UV radiation. Monoclinic Bi2O3 with 49 nm grain size and GO solution were mixed under UV radiation to form Bi2O3/RGO composite, which exhibited slightly broadening of main diffraction peaks compared to pure Bi2O3. With the increasing concentration of GO, the amount of the graphene fragments and flocculent material that attached to the surface of Bi2O3 grows and the specific surface areas of the composite catalysts increase. Under UV irradiation, Bi2O3/RGO composite catalysts have significantly stronger photocatalytic effect than Bi2O3. In the condition of 8 h-UV radiation, the composite catalyst with 2.0wt% GO produces 1.012 μmol/g CH4, whose yield is 96.5% higher than pure Bi2O3.
  • Erosion wear characterization of QAl9-4 aluminum bronze with different erosion angles
    LIU Chenglong, HUANG Weijiu, WANG Junjun, LI Zhijun
    功能材料. 2016, 47(10): 10230-10234. https://doi.org/10.3969/j.issn.1001-9731.2016.10.043
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The erosion wear characterization of QAl9-4 aluminum bronze has been investigated with different erosion angles by a self-developed rotating disc erosion wear device. The weight loss, surface morphology and roughness were measured. The results show that the accumulated weight loss of QAl9-4 aluminum alloy samples was improved little by little with increasing the erosion angle when the angle was lower than 30°, in contrast, which decreased when the angle is higher than 30°. With increasing the erosion angle, the sample surface morphology varied from the long-range furrows to the short-range furrows with erosion pits, and the surface roughness decreased gradually.
  • Deformation and fracture behavior of SiNx coating under nanoindentation test
    AN Tao, DENG Xiaofang, WANG Lili, SONG Lijun
    功能材料. 2016, 47(10): 10235-10238. https://doi.org/10.3969/j.issn.1001-9731.2016.10.044
    Abstract ( ) Download PDF ( ) Knowledge map Save
    An amorphous SiNx coating was deposited on a Si(111) substrate by using reactive magnetron sputtering a Si target. The deformation mechanisms and fracture behavior of the coating is characterized by nanoindentation experiments. FT-IR spectrum shows that the coating does not contain impurities like the Si—O bond. The SiNx coating shows median/radial fracture properties like the Si(111) substrate during nanoindentation experiments, and the cracks develop with the increase of displacement. As the peak displacement increases to 1 500 nm, a fan-like interfacial fracture between two median/radial fractures is observed during the unload segment. When the peak displacement increases to 2 500 nm, an obvious blister with a diameter of 27.3 μm were observed on the AFM image. The low interfacial fracture toughness value may be due to the appearance of covalence microstructures between the SiNx coating and the Si(111) substrate
  • Preparation, modification and its appliction of nanocrystalline cellulose in barrier coating of cellulosic paper
    LIU Dongdong,TANG Yanjun,ZHANG Xinqi,HUANG Biaobiao,ZHANG Wanqing
    功能材料. 2016, 47(10): 10239-10244. https://doi.org/10.3969/j.issn.1001-9731.2016.10.045
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In the present work, nanocrystalline cellulose was initially prepared from microcrystalline cellulose by sulfuric acid hydrolysis, and subsequently cationically modified with glycidyltrimethylammonium chloride (GTMAC) in water/DMSO mixture. Eventually, the feasiblity of the application of nanocrystalline cellulose in barrier coating of cellulosic paper was investigated. It was found that NCC exhibited a rod-like structure with a diameter between 10 and 80 nm and a length less than 400 nm, and displayed good dispersion in liquid suspensions. Moreover, CNCC was found to possess adegree of substitution of 4.1% by determination of nitrogen content. Successful modification of NCC was identified by FT-IR and XRD result. More importantly, TEM and TG results indicated that CNCC had remarkable advantage in dispersibility and thermal stability as compared to NCC. The preliminary application experiment showed that, in comparision to NCC, CNCC reinforced cellulosic paper exhibited better barrier properties. Specifically, at an addition of 0.2%, the coated paper showed a desired application efficiency of NCC and CNCC. As compared with the controlled paper, CNCC reinforced cellulosic paper showed a 22.4% decrease in air permeability and a 34.4% decrease in water absorbtion, respectively.
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