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DEFORMATION INVESTIGATION ON iPP/SiO_2 COMPOSITES: INFLUENCE OF STRETCHING TEMPERATURE AND PARTICLE SIZE ON MORPHOLOGY EVOLUTION AND CRYSTALLINE STRUCTURE OF THIN FILMS 认领 引用
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作者 Xiu-qin Zhang Qian Xing +2 位作者 Rong-bo Li 王锐 Du-jin Wang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2013年第2期275-284,共10页
In the present work, structure changes during （SiO2） composites have been investigated systematically stretching of isotactic polypropylene （iPP） and iPP/silicon dioxide The or-form crystal structure of both iPP a... In the present work, structure changes during （SiO2） composites have been investigated systematically stretching of isotactic polypropylene （iPP） and iPP/silicon dioxide The or-form crystal structure of both iPP and iPP/SiO2 composites is destroyed and transforms into the mesophase as the samples are stretched at a low temperature （35℃）, while stretching at high temperatures （90℃ and 120℃） can restrain the appearance of defects and keep the perfection of crystal structure. FTIR results reveal that the stretching temperatures show no obvious difference of the effect on the orientation of pure iPP, however, the orientation of iPP/SiO2 composites is greatly changed by the tensile temperature. In the case of micron-sized SiO2 particles （average particle diameter d 〉 1 μm）, the orientation of the composites is lower than that of pure iPP at all stretching temperatures. The above results suggest that the stretching temperature and the SiO2 particle size have great influence on the structure variation and orientation behavior of iPP/SiO2 composites. 展开更多
关键词 iPP/SiO2 composites Stretching Morphology Structure variation.
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Effect of boron doping on waterproof and dielectric properties of polyborosiloxane coating on SiO2f/SiO2 composites 认领 引用 被引量：8
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作者 Long XIA Siru LU +7 位作者 Bo ZHONG Longnan HUANG Hua YANG Tao ZHANG Haibo HAN Pan WANG Li XIONG Guangwu WEN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2019年第8期2017-2027,共11页
A hydrophobic coating of the silica fiber reinforced silica composites(SiO2f/SiO2) was synthesized by sol-gel method using methyltriethoxy-silane(MTES) and boric acid(B(OH)3) as raw materials. The relationship among b... A hydrophobic coating of the silica fiber reinforced silica composites(SiO2f/SiO2) was synthesized by sol-gel method using methyltriethoxy-silane(MTES) and boric acid(B(OH)3) as raw materials. The relationship among boron doping, chemical structure of precursors and durability of hydrophobic coatings was discussed. The Si-O-B and methyl groups were successfully introduced in the gel precursors according to the FT-IR and XPS results. The resins were filled in the internal and surface holes of the SiO2f/SiO2 composites partially or completely, which is beneficial to reduce the physical adsorption of the moisture. In addition, hydroxyl groups of the SiO2f/SiO2 composites reacted with the resins and hydrophobic methyl groups were introduced, leading to the reduction of the chemical adsorption of water. Also, the boron doping was beneficial to enhancing the physical cross-linking between the coating and the SiO2f/SiO2 composites, and improved the adhesion of the coating to the substrate. The results show that the optimal hydrophobic coating with contact angle 130.33°, moisture absorption 0.33% and adhesion level 1 is obtained when the molar ratio of MTES to B(OH)3 is 10:4. The real permittivity of M10B4 is constant in the range of 2.32–2.51 and the dielectric tangent loss is constant in the range of 5.5 × 10-4–8.7 × 10-3. The hydrophobic coating has excellent dielectric properties. 展开更多
关键词 Adhesion Dielectric Hydrophobic Polyborosiloxane SiO2f/SiO2 composites
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The influence of ablation products on the ablation resistance of C/C-SiC composites and the growth mechanism of SiO_2 nanowires 认领 引用 被引量：2
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作者 李县辉 燕青芝 +3 位作者 米应映 韩永军 温馨 葛昌纯 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第2期7-11,共5页
Ablation under oxyacetylene torch with heat flux of 4186.8（10%kW/m2 for 20 s was performed to evaluate the ablation resistance of C/C-SiC composites fabricated by chemical vapor infiltration（CVI） combined with liqu... Ablation under oxyacetylene torch with heat flux of 4186.8（10%kW/m2 for 20 s was performed to evaluate the ablation resistance of C/C-SiC composites fabricated by chemical vapor infiltration（CVI） combined with liquid silicon infiltration（LSI） process.The results indicated that C/C-SiC composites present a better ablation resistance than C/C composites without doped SiC.The doped SiC and the ablation products SiO2 derived from it play key roles in ablation process.Bulk quantities of SiO2 nanowires with diameter of 80 nm-150 nm and length of tens microns were observed on the surface of specimens after ablation.The growth mechanism of the SiO_2 nanowires was interpreted with a developed vapor-liquid-solid（VLS） driven by the temperature gradient. 展开更多
关键词 C/C-SiC composites ablation products SiO2 nanowires growth mechanism
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Fabrication and characterization of SiO2(f)/Si)_3N_4 composites 认领 引用 被引量：4
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作者 Yongsheng Liu Laifei Cheng +2 位作者 Litong Zhang Yongdong Xu Yi Liu 《Journal of University of Science and Technology Beijing》 2007年第5期454-459,共6页
A silicon dioxide fiber-reinforced silicon nitride matrix(SiOJSi3N4)composite used for radomes was prepared by chemical vapor infiltration(CVI)process using the SiCl4-NH3-H2 system.The effects of the process condition... A silicon dioxide fiber-reinforced silicon nitride matrix(SiOJSi3N4)composite used for radomes was prepared by chemical vapor infiltration(CVI)process using the SiCl4-NH3-H2 system.The effects of the process conditions,including infiltration temperature,infiltration time,and gas flux were investigated.The energy dispersion spectra(EDS)result showed that the main elements of this composite contained Si,N,and O.The X-ray diffraction(XRD)results indicated that phases of the composite before and after treatment at 1350℃were all amorphous.A little fiber pull-out was observed on the cross section of the composite by scan electron microscope(SEM).As a result,the composite exhibited good thermal stability,but an appropriate interface was necessary between the fiber and the matrix. 展开更多
关键词 SiO2/Si3N4 composite fabrication characterization chemical vapor infiltration
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Fracture Mechanism of 3D, Five-directional Braided (SiO_2)_f /SiO_2 Composites Prepared by Silicasol-infiltration-sintering Method 认领 引用 被引量：1
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作者 李斌斌 ZHU Jianxun +2 位作者 LIN Long LIU Yong CHEN Zhaofeng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第2期355-357,共3页
Three-dimensional （3D） five-directional braided （SiO2）/SiO2 composites were prepared by silicasol-infiltration-sintering （SIS） method. The flexural properties and microstructures were studied. The flexural stren... Three-dimensional （3D） five-directional braided （SiO2）/SiO2 composites were prepared by silicasol-infiltration-sintering （SIS） method. The flexural properties and microstructures were studied. The flexural strength and flexural elastic modulus were found to be 73 MPa and 12 GPa, respectively. The results of stress vs deflection curve and SEM examinations revealed that the fracture mechanism of 3D, five-directional braided （SiO2）/SiO2 composite was a mixture mode of ductile and brittle. The ductile mode was attributed to the weak bonding strength of fiber/matrix at low temperature. The brittle fracture might be caused by the propagation of micro defect or crack, which existed in the as-prepared composites for the ten-cycle process. 展开更多
关键词 fracture mechanism 3D five-directional （SiO2）y/SiO2 composite silicasol-infiltrationsintering method
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Photocatalytic and Thermal Insulating Performances of Fiber Reinforced Hierarchical TiO_2/SiO_2 Xerogel Composites Synthesized by Ambient Drying Route 认领 引用
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作者 徐海珣 赵善宇 +2 位作者 郑猛 贾佳佳 朱平华 《Journal of Donghua University(English Edition)》 CAS 2017年第4期570-576,共7页
Silica( SiO_2) based aerogel/xerogel materials have been received ever-growing attentions for versatile applications. However,the widespread applications are narrowed by the inert properties,fragile and brittle nature... Silica( SiO_2) based aerogel/xerogel materials have been received ever-growing attentions for versatile applications. However,the widespread applications are narrowed by the inert properties,fragile and brittle natureof silica materials and cumbersome preparation processes. In this paper,titania( TiO_2) was introduced into SiO_2 matrix to form photocatalytic hybrid gels. The TiO_2/SiO_2 composites were then reinforced by the impregnation of various fibrillary reinforcements,such as glass,mullite mineral and ceramic fibers. The properties of the composites were studied systematically in terms of fiberstability,microstructure,chemical interaction and thermal conductivity. The final xerogel composites displayed improved monolithic geometry,satisfied thermal conductivity(0. 09-0. 25 W·m-1·K-1) and optimized photocatalytic performance(85% removal of model pollutant of methyl orange( Mo)),which could be expected to be a feasible route to multi-functional building facades in the future. 展开更多
关键词 titania-silica（TiO2/SiO2） composite photocatalytic thermal conductivity fiber reinforcement
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Preparation of hollow B–SiO2@TiO2 composites and their photocatalytic performances for degradation of ammonia-nitrogen and green algae in aqueous solution 认领 引用 被引量：7
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作者 Qin Zhou Hengbo Yin +1 位作者 Aili Wang Yang Si 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第10期2535-2543,共9页
Hollow B–SiO2@TiO2 composites were prepared by the wet chemical deposition method starting from TiCl4 and hollow B–SiO2 microspheres.TiO2 layers composed of anatase TiO2 nanoparticles were coated on the surfaces of ... Hollow B–SiO2@TiO2 composites were prepared by the wet chemical deposition method starting from TiCl4 and hollow B–SiO2 microspheres.TiO2 layers composed of anatase TiO2 nanoparticles were coated on the surfaces of the hollow B–SiO2 microspheres probably through the formation of Ti—O—Si and Ti—O—B bonds.A great number of—OH groups were also present at the TiO2 coating layers.The presence of Ti—O—Si bonds and Ti—O—B bonds resulted in the formation of defects in the TiO2 coating layers,which decreased the band gap of the TiO2 coating layers to ca.3.0 eV and endowed the TiO2 coating layers with visible light absorption performance.The buoyancy hollow B–SiO2@TiO2 composites exhibited high photocatalytic activities for the degradation of ammonia-nitrogen and green algae.The conversion of ammonia-nitrogen reached 65%when the degradation of ammonia-nitrogen(43 mg·L-1 at pH value of 8)was catalyzed by the B–SiO2@TiO2(100:10)composite under the simulated solar light irradiation at 35°C for 660 min.The green algae(5 mg·L-1)were almost completely degraded over the B–SiO@TiO2(100:20)photocatalyst under the visible light irradiation at 35°C for 510 min. 展开更多
关键词 B–SiO2@TiO 2composites Photocatalysis Ammonia-nitrogen Green algae
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SiO_x-based(0 认领 引用 被引量：4
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作者 Tong Wang Xiaotian Guo +2 位作者 Huiyu Duan Changyun Chen Huan Pang 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第3期654-666,共13页
Silicon(Si) materials as anode materials for applications in lithium-ion batteries(LIBs) have received increasing attention.Among the Si materials,the electrochemical properties of SiOx-based(0<x≤2)composites are ... Silicon(Si) materials as anode materials for applications in lithium-ion batteries(LIBs) have received increasing attention.Among the Si materials,the electrochemical properties of SiOx-based(0<x≤2)composites are the most prominent.However,due to the cycling stability of SiOx being far from practical,there are some problems,such as Iow initial coulombic efficiency(ICE),obvious volume expansion and poor conductivity.Researchers in various countries have optimized the electrochemical properties of SiOx-based composites by means of pore formation,surface modification,and the choice of constituents.In this review,SiOx-based composites are classified into three categories based on the valency of Si(SiO2 composites,SiO composites and SiOx(0<x<2) composites).The synthesis,morphologies and electrochemical properties of the SiOx-based composites that are applied in LIB are discussed.Finally,the prope rties of several common SiOx-based composites are briefly compared and the challenges faced by SiOx-based composites are highlight. 展开更多
关键词 Lithium-ion battery Anode material SiO2 composites SiO composites SiOx-based(0composite
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Nanoindentation Study on Mechanical Properties of Nano-SiO2/Dental Resin Composites 认领 引用 被引量：1
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作者 Chao Zha Jianhua Hu +7 位作者 Ainong Li Shangyu Huang Hanxing Liu Gang Chen Anqi Lei Zuoqi Zhang Bei Li Zhengzhi Wang 《Journal of Materials Science and Chemical Engineering》 2018年第4期57-64,共8页
The microano-scale indentation tests were performed to explore the performance of bisphenol-α-glycidyl methacrylate (Bis-GMA)riethylene glycol dimethacrylate (TEGDMA) dental resin composites. The effect of the fillin... The microano-scale indentation tests were performed to explore the performance of bisphenol-α-glycidyl methacrylate (Bis-GMA)riethylene glycol dimethacrylate (TEGDMA) dental resin composites. The effect of the filling content of nano-SiO2 particles on the mechanical properties of the dental composites was studied as well. The experimental results showed that the incorporation of the nano-SiO2 particles at low concentrations (up to 10 wt.%) can apparently increase the hardness and elastic modulus of the dental rein composites. The plasticity index indicates a best elastic recovery capability at a proper amount (4 wt.%) of the nanoparticles. Combined with the infrared spectrum, the mechanical enhancement mechanisms of the dental resin composites were analyzed. 展开更多
关键词 Indentation SiO2 Nanoparticles Dental Resin Composites Mechanical Properties
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Fe2O3-SiO2复合气凝胶材料的制备及耐温性能 认领 引用 被引量：2
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作者 侯建业 张忠伦 +2 位作者 付晓晴 王明铭 刘振森 《耐火材料》 CAS 北大核心 2025年第2期133-137,共5页
为了提高SiO2气凝胶在高温下的隔热性能,以溶胶-凝胶两步法制备SiO2前驱体溶液,将遮光剂Fe2O3粉末添加到SiO2前驱体溶液中,结合二氧化碳超临界干燥技术,制备出Fe2O3-SiO2复合气凝胶,探究Fe2O3遮光剂的添... 为了提高SiO2气凝胶在高温下的隔热性能,以溶胶-凝胶两步法制备SiO2前驱体溶液,将遮光剂Fe2O3粉末添加到SiO2前驱体溶液中,结合二氧化碳超临界干燥技术,制备出Fe2O3-SiO2复合气凝胶,探究Fe2O3遮光剂的添加(Fe2O3外加质量分数分别为0、0.2%、0.5%、1.0%和3.0%)对气凝胶的影响。结果表明:1)Fe2O3添加到气凝胶中,不会影响气凝胶的形貌;Fe2O3的添加抑制了材料因高温造成的质量损失,提高了复合材料在高温下的稳定性。2)温度低于800℃时,Fe2O3外加量为0.5%(w)的试样,其热导率最低,隔热性能最好;而在800~1000℃温度下,Fe2O3外加量为1%(w)的试样,其热导率最低,仍保持较好的纳米多孔结构。3)通过控制Fe2O3外加量,可以得到适用于不同温度段的复合气凝胶。 展开更多
关键词 Fe2O3-SiO2复合气凝胶 遮光剂 孔结构 热导率 高温性能
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A phase inversion based sponge-like polysulfonamide/SiO_2 composite separator for high performance lithium-ion batteries 认领 引用 被引量：8
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作者 Xiao Wang Gaojie Xu +5 位作者 Qingfu Wang Chenglong Lu Chengzhong Zong Jianjun Zhang Liping Yue Guanglei Cui 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第6期1292-1299,共8页
In this work,a sponge-like polysulfonamide(PSA)/SiO_2 composite membrane is unprecedentedly prepared by the phase inversion method,and successfully demonstrated as a novel separator of lithium-ion batteries(LIBs).Comp... In this work,a sponge-like polysulfonamide(PSA)/SiO_2 composite membrane is unprecedentedly prepared by the phase inversion method,and successfully demonstrated as a novel separator of lithium-ion batteries(LIBs).Compared to the commercial polypropylene(PP) separator,the sponge-like PSA/SiO_2 composite possesses better physical and electrochemical properties,such as higher porosity,ionic conductivity,thermal stability and flame retarding ability.The LiCoO_2/Li half-cells using the sponge-like composite separator demonstrate superior rate capability and cyclability over those using the commercial PP separator.Moreover,the sponge-like composite separator can ensure the normal operation of LiCoO_2/Li half-cell at an extremely high temperature of 90 °C,while the commercial PP separator cannot.All these encouraging results suggest that this phase inversion based sponge-like PSA/SiO_2 composite separator is really a promising separator for high performance LIBs. 展开更多
关键词 Polysulfonamide/SiO2 composite Phase inversion method Separator Performance enhancement Lithium-ion battery
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The effects of radiation damage on power VDMOS devices with composite SiO_2-Si_3N_4 films 认领 引用 被引量：3
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作者 高博 刘刚 +5 位作者 王立新 韩郑生 宋李梅 张彦飞 腾瑞 吴海舟 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第3期393-398,共6页
Total dose effects and single event effects on radiation-hardened power vertical double-diffusion metal oxide semiconductor（VDMOS） devices with composite SiO2-Si3N4 film gates are investigated.The relationships amon... Total dose effects and single event effects on radiation-hardened power vertical double-diffusion metal oxide semiconductor（VDMOS） devices with composite SiO2-Si3N4 film gates are investigated.The relationships among the important electrical parameters of the samples with different thickness SiO2-Si3N4 films,such as threshold voltage,breakdown voltage,and on-state resistance in accumulated dose,are discussed.The total dose experiment results show that the breakdown voltage and the on-state resistance barely change with the accumulated dose.However,the relationships between the threshold voltages of the samples and the accumulated dose are more complex,and not only positively drift,but also negatively drift.At the end of the total dose experiment,we select the group of samples which have the smaller threshold voltage shift to carry out the single event effect studies.We find that the samples with appropriate thickness ratio SiO2-Si3N4 films have a good radiation-hardening ability.This method may be useful in solving both the SEGR and the total dose problems with the composite SiO2-Si3N4 films. 展开更多
关键词 power VDMOS device total dose effects single event effects composite SiO2-Si3N4 films
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Effect of catalyst on structure of(PEO)_8LiClO_4-SiO_2 composite polymer electrolyte films 认领 引用 被引量：3
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作者 潘春跃 张倩 +2 位作者 冯庆 高金环 赵悠曼 《Journal of Central South University of Technology》 2008年第4期438-442,共5页
(PEO)8LiClO4-SiO2 composite polymer electrolytes(CPEs)were prepared by in-situ reaction,in which ethyl-orthosilicate(TEOS)was catalyzed by HCl and NH3.H2O,respectively.The ionic conductivity,the contact angle and the ... (PEO)8LiClO4-SiO2 composite polymer electrolytes(CPEs)were prepared by in-situ reaction,in which ethyl-orthosilicate(TEOS)was catalyzed by HCl and NH3.H2O,respectively.The ionic conductivity,the contact angle and the morphology of inorganic particles in the CPEs were investigated by AC impedance spectra,contact angle method and TEM.The conductivities of acid-catalyzed CPE and alkali-catalyzed CPE are 2.2×10-5and 1.1×10-5S/cm respectively at 30℃.The results imply that the catalyst plays an important role in the structure of in-situ preparation of SiO2,and influences the surface energy and conductivity of CPE films directly.Meanwhile,the ionic conductivity is related to the surface energy. 展开更多
关键词 PEO（polyethylene oxide） SiO2 composite polymer electrolyte conductivity catalytic reaction
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Grain Size and Wettability of TiO_2/SiO_2 Photocatalytic Composite Thin Filing 认领 引用 被引量：11
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作者 Jiaguo Yu, Xiujian Zhao, Jimmy C Yu, Jun Lin (State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China Deportment of Chemised The Chinese University of Hong Kong, Hong Kong, 《Rare Metals》 SCIE EI CAS 2001年第2期81-86,共6页
The uniform transparent TiO2/SiO2 photocatalytic composite thin films are prepared by sol-gel method on the soda lime glass substrates, and characterized by UV-visible spectroscopy, X-ray diffraction (XRD), transmissi... The uniform transparent TiO2/SiO2 photocatalytic composite thin films are prepared by sol-gel method on the soda lime glass substrates, and characterized by UV-visible spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), BET surface area, FTIR spectroscopy and X-ray photoelectron spectroscopy (XPS). It was found that the addition of SiO2 to TiO2 thin films can suppress the grain growth of TiO2 crystal, increase the hydroxyl content on the surface of TiO2 films, lower the contact angle for water on TiO, films and enhance the hydrophilic property of TiO2 films. The super-hydrophilic TiO2/SiO2 photocatalytic composite thin films with the contact angle of 0((o) under bar) are obtained by the addition of 10%-20% SiO2 in mole fraction. 展开更多
关键词 sol-gel method TiO2/SiO2 photocatalytic composite thin films grain size wettability
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Microstructure and hardness of Mg-based composites reinforced with Mg_2Si particles 认领 引用
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作者 Mustafa Aydin Cem zgür Osman San 《Rare Metals》 SCIE EI CAS 2009年第4期396-400,共5页
Magnesium powders were mechanically alloyed with SiO2 powder particles having different particle sizes using nigh-energy ball milling techniques under Ar atmosphere for 1 h. The powders were consolidated with cold pre... Magnesium powders were mechanically alloyed with SiO2 powder particles having different particle sizes using nigh-energy ball milling techniques under Ar atmosphere for 1 h. The powders were consolidated with cold pressing under 560 MPa. They were then sintered at 550℃ for 45 min under Ar atmosphere. The composites obtained on the Mg-SiO2 system were investigated using the Archimedes principle, a differential scanning calorimeter, X-ray diffraction, optic microscopy, and scanning electron microscopy. For the mechanically alloyed powders, the solid-state reaction of the synthesis of Mg2Si and MgO progressed further during sintering of the materials. The results showed that the strengthening mechanisms were dependent on dispersion hardening of fine Mg2Si and MgO particulates dispersed homogeneously in the matrix. Mg- 展开更多
关键词 based composites SiO2 mechanical alloying strengthening mechanism
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Preparation of Al_2O_3-SiO_2-TiO_2-ZrO_2 Composite Ceramic Membranes by Sol-Gel Method 认领 引用
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作者 吴建锋 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2005年第1期42-45,共4页
Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO 2(a nat... Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO 2(a natase), Al 2SiO 5, and ZrO 2 in these membranes. Changing the molar ratio of Al∶Si∶Ti∶Zr,the kinds and content of crystal phases of composite membranes could be different, which may lead to a variety of microstructure of membranes. The surface nanoscale topography and microstructure of membranes were investiga ted by XRD,SEM,AFM,EPMA. The effects of additives and heat treatments on the sur face nanoscale topography and microstructure of composite ceramic membranes were also analyzed. 展开更多
关键词 sol-gel method Al 2O 3-SiO 2-TiO 2-ZrO 2 composite ceramic membranes surface nanoscale topography microstructure
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Preparation of Supermacroporous Composite Cryogel Embedded with SiO_2 Nanoparticles 认领 引用 被引量：4
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作者 许潘萍 姚雨辰 +2 位作者 沈绍传 贠军贤 姚克俭 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2010年第4期667-671,共5页
Supermacroporous composite cryogels embedded with SiO2 nanoparticles were prepared by radical cryogenic copolymerization of the reactive monomer mixture of acrylamide（AAm） and N,N-methylene-bis-acrylamide（MBAAm） c... Supermacroporous composite cryogels embedded with SiO2 nanoparticles were prepared by radical cryogenic copolymerization of the reactive monomer mixture of acrylamide（AAm） and N,N-methylene-bis-acrylamide（MBAAm） containing SiO2 nanoparticles（mass ratios of nanoparticles to the monomer AAm from 0.01 to 0.08） under the freezing-temperature variation condition in glass columns.The properties of these composite cryogels were measured.The height equivalent to theoretical plate（HETP） of the cryogel beds at different liquid flow rates was determined by residence time distribution（RTD） using tracer pulse-response method.The composite cryogel matrix embedded with the mass fraction of SiO2 nanoparticles of 0.02 presented the best properties and was employed in the following graft polymerization.Chromatographic process of lysozyme in the composite cryogel grafted with 2-acrylamido-2-methyl-1-propanesulfonic acid（AMPSA） was carried out to evaluate the protein breakthrough and elution characteristics.The chromatography can be carried out at relatively high superficial velocity,i.e.,15 cm·min-1,indicating the satisfactory mechanical strength due to the embedded nanoparticles. 展开更多
关键词 composite cryogel SiO2 nanoparticle protein chromatography
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Preparation and Characterization of Tetracomponent ZnO/SiO2/SnO2/TiO2Composite Nanofibers by Electrospinning 认领 引用
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作者 Chao Song Xiangting Dong 《Advances in Chemical Engineering and Science》 CAS 2012年第1期108-112,共5页
[Zn(CH3COO)2 + PVP]/[C2H5O)4Si + PVP]/[SnCl4 + PVP]/[Ti(OC4H9)4 + CH3COOH + PVP] precursor composite fibers have been fabricated through self-made electrospinning equipment via electrospinning tech-nique. ZnO/SiO2/SnO... [Zn(CH3COO)2 + PVP]/[C2H5O)4Si + PVP]/[SnCl4 + PVP]/[Ti(OC4H9)4 + CH3COOH + PVP] precursor composite fibers have been fabricated through self-made electrospinning equipment via electrospinning tech-nique. ZnO/SiO2/SnO2/TiO2 composite nanofibers were obtained by calcination of the relevant precursor composite fibers. The samples were characterized by thermogravimetric-differential thermal analysis (TG-DTA), X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), and Scanning electron microscopy (SEM). TG-DTA analysis reveals that solvents, organic compounds and inorganic in the precursor composite fibers are decomposed and volatilized totally, and the mass of the samples kept constant when sintering temperature was above 900?C, and the total mass loss percentage is 88%. XRD results show that the precursor composite fibers are amorphous in structure, and pure phase ZnO/SiO2/SnO2/TiO2 com-posite nanofibers are obtained by calcination of the relevant precursor composite fibers. FTIR analysis manifests that pure inorganic oxides are formed. SEM analysis indicates that the width of the precursor composite fibers is ca. 1.485 ± 0.043 μm. The width of the ZnO/SiO2/SnO2/TiO2 composite nanofibers is ca. 1145.098 ± 68.093 nm. 展开更多
关键词 ZnO/SiO2/SnO2/TiO2 Tetracomponent Composite Nanofibers Electrospinning
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Photocatalytic activity of TiO_2 supported SiO_2-Al_2O_3 aerogels prepared from industrial fly ash 认领 引用 被引量：10
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作者 王慧龙 齐慧萍 +2 位作者 魏晓娜 刘潇彧 姜文凤 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第11期2025-2033,共9页
A ternary composite of TiO2 and a SiO2-Al2O3 aerogel with good photocatalytic activity was prepared by a simple sol-gel method with TiO2 nanoparticles and SiO2-Al2O3 aerogels derived from industrial fly ash.The struct... A ternary composite of TiO2 and a SiO2-Al2O3 aerogel with good photocatalytic activity was prepared by a simple sol-gel method with TiO2 nanoparticles and SiO2-Al2O3 aerogels derived from industrial fly ash.The structural features of the TiO2/SiO2-Al2O3 aerogel composite were investigated by X-ray powder diffraction,Fourier transform infrared spectroscopy,transmission electron microscopy,gas adsorption measurements and diffuse reflectance UV-visible spectroscopy.The optimal conditions for photocatalytic degradation of 2-sec-butyl-4,6-dinitrophenol（DNBP],included an initial DNBP concentration of 0.167 mmol/L at pH = 4.86 with a catalyst concentration of 6 g/L,under visible light irradiation for 5 h.A plausible mechanism is proposed for the photocatalytic degradation of DNBP.Our composite showed higher photocatalytic activity for DNBP degradation than that of pure TiO2.This indicates that this material can serve as an efficient photocatalyst for degradation of hazardous organic pollutants in wastewater. 展开更多
关键词 Titania SiO2-Al2O3 aerogel Composite photocatalyst Industrial fly ash 2-sec-butyl-4 6-dinitrophenol Wastewater treatment
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纳米SiO2-矿渣-水泥复合胶凝材料的抗硫酸盐侵蚀试验 认领 引用 被引量：18
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作者 谢超 王起才 +3 位作者 于本田 张戎令 代金鹏 王云天 《材料科学与工程学报》 CAS CSCD 北大核心 2020年第1期88-93,共6页
为研究纳米二氧化硅-矿渣-水泥复合胶凝材料的抗硫酸盐侵蚀性能,将砂浆试件浸泡在不同温度下的3%硫酸钠溶液中进行侵蚀试验,以抗折强度和抗蚀系数作为指标对其抗蚀性进行评价,并与普通硅酸盐水泥和抗硫酸盐水泥试件进行对比。采用微观... 为研究纳米二氧化硅-矿渣-水泥复合胶凝材料的抗硫酸盐侵蚀性能,将砂浆试件浸泡在不同温度下的3%硫酸钠溶液中进行侵蚀试验,以抗折强度和抗蚀系数作为指标对其抗蚀性进行评价,并与普通硅酸盐水泥和抗硫酸盐水泥试件进行对比。采用微观分析方法对腐蚀产物的成分进行分析。研究结果表明:纳米二氧化硅-矿渣-水泥复合胶凝材料在不同温度下均具有优异的抗硫酸盐侵蚀能力,随着纳米二氧化硅掺量的增加,抗蚀性能增强;随着温度的降低,试件的侵蚀速率加快,270d的抗蚀系数及抗折强度逐渐降低。养护温度的改变导致腐蚀产物的成分发生变化,5℃养护条件下腐蚀产物中钙矾石及碳硫硅钙石均存在,但以后者为主。 展开更多
关键词 复合胶凝材料 硫酸盐侵蚀 纳米SiO2 低温养护
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