期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到637篇文章
< 1 2 … 32 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Preparation and High-temperature Resistance of Fe2O3-SiO2Composite Aerogel Materials 认领 引用
1
作者 HOU Jianye ZHANG Zhonglun +2 位作者 FU Xiaoqing WANG Mingming LIU Zhensen 《China's Refractories》 CAS 2025年第4期42-46,共5页
To improve the thermal insulation performance of SiO2aerogels at high temperatures,SiO2precursor solutions were prepared via a sol-gel two-step method.Fe2O3powder was extra added as an opacifier to the SiO... To improve the thermal insulation performance of SiO2aerogels at high temperatures,SiO2precursor solutions were prepared via a sol-gel two-step method.Fe2O3powder was extra added as an opacifier to the SiO2precursor solutions with mass fractions of 0,0.2%,0.5%,1.0%,and 3.0%;and Fe2O3-SiO2composite aerogels were fabricated using CO2supercritical drying technology.The effects of the Fe2O3extra addition on the aerogels were investigated.The results show that:(1)Fe2O3doping does not alter the aerogel morphology;Fe2O3suppresses the mass loss at high temperatures and enhances the high-temperature stability of the composite;(2)below 800℃,the aerogel with 0.5%Fe2O3exhibits the lowest thermal conductivity and the best thermal insulation performance;at 800-1000℃,the aerogel with 1%Fe2O3exhibits the lowest thermal conductivity and a good nanoporous structure;(3)by adjusting the Fe2O3extra addition,composite aerogels suitable for different temperature ranges can be tailored. 展开更多
关键词 Fe2O3-SiO2composite aerogels opacifier pore structure thermal conductivity high temperature performance
暂未订购 下载PDF
Ti3C2Tx Composite Aerogels Enable Pressure Sensors for Dialect Speech Recognition Assisted by Deep Learning 认领 引用 被引量：5
2
作者 Yanan Xiao He Li +8 位作者 Tianyi Gu Xiaoteng Jia Shixiang Sun Yong Liu Bin Wang He Tian Peng Sun Fangmeng Liu Geyu Lu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2025年第5期1-15,共15页
Wearable pressure sensors capable of adhering comfortably to the skin hold great promise in sound detection.However,current intelligent speech assistants based on pressure sensors can only recognize standard languages... Wearable pressure sensors capable of adhering comfortably to the skin hold great promise in sound detection.However,current intelligent speech assistants based on pressure sensors can only recognize standard languages,which hampers effective communication for non-standard language people.Here,we prepare an ultralight Ti3C2TxMXene/chitosan/polyvinylidene difluoride composite aerogel with a detection range of 6.25 Pa-1200 k Pa,rapid responseecovery time,and low hysteresis(13.69%).The wearable aerogel pressure sensor can detect speech information through the throat muscle vibrations without any interference,allowing for accurate recognition of six dialects(96.2%accuracy)and seven different words(96.6%accuracy)with the assistance of convolutional neural networks.This work represents a significant step forward in silent speech recognition for human–machine interaction and physiological signal monitoring. 展开更多
关键词 Pressure sensor Wearable sensor Ti3C2Tx composite aerogel Dialect speech recognition
暂未订购 下载PDF
Preparation and Properties of Ti3SiC2-modified High Silica/Phenolic Aerogel Composite 认领 引用
3
作者 CAO Wenjing LIU Yiming +4 位作者 ZHAO Dongmei WAN Xiaobo LIU Yang HUANG Kun SHI Minxian 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2025年第6期1563-1571,共9页
A Ti3SiC2-modified high-silica oxygen/phenolic aerogel composite with excellent oxidation resistance and high-temperature performance was prepared.The experimental results show that the obtained composite has si... A Ti3SiC2-modified high-silica oxygen/phenolic aerogel composite with excellent oxidation resistance and high-temperature performance was prepared.The experimental results show that the obtained composite has significantly improved oxidation resistance.When the addition amount of Ti3SiC2is 75%,the carbonization volume shrinkage rate of the composite after aerobic static combustion is only 5.95%.At the same time,the LAR and MAR after 30 seconds of oxyacetylene ablation under a heat flux density of 1.5 MW/m2 are 0.0307 mm/s and 0.0149 g/s,respectively.The compressive strength after aerobic static combustion at 1000℃is up to 20.43%of that before aerobic static combustion,which is 1.99 times that of the unfilled material,significantly improving the high-temperature mechanical properties of the composite. 展开更多
关键词 Ti3SiC2 phenolic aerogel composites high silica fiber thermal conductivity
暂未订购 下载PDF
Scalable Synthesis of Ultrathin Silica Nanosheets for Applications in Thermal-Management Aerogels and Flexible Composite Films 认领 引用
4
作者 Qun-Yao Yuan Yuan-Fan Gu +1 位作者 Rong-Rong Cheacharoen Jie Zhao 《Rare Metals》 SCIE EI CAS CSCD 2026年第1期569-579,共11页
Silica nanosheets(SiO2 NSs) hold great promise for advanced thermal protection applications because of their exceptional thermal and chemical stability.However,their development has been hindered by challenges in s... Silica nanosheets(SiO2 NSs) hold great promise for advanced thermal protection applications because of their exceptional thermal and chemical stability.However,their development has been hindered by challenges in scalable synthesis and structural integration for specialized applications.Herein,we report a facile and scalable wet-chemical strategy for producing high-quality and ultrathin SiO2 NSs with lateral dimension more than 5 μm and thickness of ~2 nm.After graphene oxide(GO)-templated thermal treatment,the mechanical stiffness of the SiO2 NSs was significantly enhanced from 60.9 to 76.1 GPa.Leveraging their unique ultrathin and large lateral properties,the ultralight SiO2 NSs aerogel was achieved via a bidirectional freeze-casting technique.The aerogel demonstrates excellent fire resistance and high-temperature tolerance,maintaining its structure upon direct exposure to 1200℃ flames.Furthermore,the integration of SiO2 NSs into a polycaprolactone(PCL) matrix has enabled the development of a large-area and flexible fire-retardant composite film,which exhibits an exceptional flame selfextinguishing time of 2 s and mechanical flexibility.This work offers a scalable platform for fabricating functional SiO2 NSsbased materials and paves the way for their potential application in energy devices,aerospace protection,and flexible electronics. 展开更多
关键词 SiO2aerogels SiO2composite films SiO2nanosheets thermal management
暂未订购 下载PDF
Structural Characteristics and Photocatalytic Activity of Ambient Pressure Dried SiO2/TiO2 Aerogel Composites by One-step Solvent Exchange/Surface Modification 认领 引用 被引量：3
5
作者 徐海珣 朱平华 +2 位作者 WANG Lijiu JIANG Zuqiang 赵善宇 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第1期80-86,共7页
An ambient pressure synthesis of SiO2/TiO2 binary aerogel was prepared through the low-cost precursors of titanium tetrachloride（TiCl4） and sodium silicate（Na2O·nSiO2）.After gelation,solvent exchange and surf... An ambient pressure synthesis of SiO2/TiO2 binary aerogel was prepared through the low-cost precursors of titanium tetrachloride（TiCl4） and sodium silicate（Na2O·nSiO2）.After gelation,solvent exchange and surface modification were performed simultaneously and the modified gel was finally dried under ambient pressure.Microstructural analyses by transmission electron microscope（TEM） indicate that fabricated SiO2/TiO2 aerogel composite shows similar sponge-like nanostructure as silica aerogel,and the Brunauer-EmmettTeller（BET） analysis shows that the specific surface area of the composite reaches 605 m^2/g,and the average pore size is 9.7 nm.Such binary aerogel exhibits significant photocatalytic performance in this paper for treating model pollutant of methyl orange（MO）,and the decolorizing efficiency of MO is detected as 84.9%after 210 mins exposure to UV light irradiation.Degraded gel suspends in the water so as to separate from solution for reuse,and after 4 times recycling,70%degradation efficiency can be easily reached when composite catalyzed system is exposed for 210 mins under UV irradiation. 展开更多
关键词 photocatalytic activity water glass SiO2/TiO2 binary aerogel ambient drying
暂未订购 下载PDF
Preparation and Characterization of Alumina-coated Hollow Quartz Fiber Reinforced Al2O3-SiO2 Aerogel Composite 认领 引用 被引量：3
6
作者 ZHANG Han LIU Junlong ZHU Shizhen 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2022年第3期324-330,共7页
Al2O3–SiO2sols were synthesized by using aluminum chloride hex hydrate and tetraethoxysilane(TEOS)as precursors,deionized water and ethanol mixture as the solvent,and propylene oxide as the coagulant aids.Al... Al2O3–SiO2sols were synthesized by using aluminum chloride hex hydrate and tetraethoxysilane(TEOS)as precursors,deionized water and ethanol mixture as the solvent,and propylene oxide as the coagulant aids.Alumina coatings were prepared on the surfaces of hollow quartz filament fiber,then a new lightweight and thermal insulating material were successfully prepared by impregnatingAl2O3–SiO2sol into a needle fabric made by coated hollow quartz filament fiber.The coated quartz fiber,aerogels and composites were characterized by Fourier transform infrared spectroscopy(FTIR),X-ray diffraction(XRD),energy dispersive spectroscopy(EDS),nitrogen adsorption-desorption(BET),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and tensile tests.The effects of different fiber and calcination temperatures on the microstructures and properties ofAl2O3–SiO2composite aerogels were investigated.The test results indicate that the mechanical properties of the aerogels are improved by introducing quartz filament fabrics and the introduction of alumina coating improves the thermal stability of the material.Compared to other fibers,Al2O3-coated hollow quartz fiber has significant advantages as reinforcement for composite,and their tensile strength is well retained after high temperature heat treatment. 展开更多
关键词 Al2O3-SiO2aerogel composites hollow quartz fiber thermal insulation property thermal stability
暂未订购 下载PDF
Corrosion Resistance of Sintered NdFeB Permanent Magnet With Ni-P/TiO_2 Composite Film 认领 引用 被引量：20
7
作者 SONG Lai-zhou YANG Zhi-yong 《Journal of Iron and Steel Research International》 SCIE CAS 2009年第3期89-94,共6页
The Ni-P/TiO2 composite film on sintered NdFeB permanent magnet was investigated by X-ray diffraction （XRD）,environmental scanning electron microscopy （ESEM）,and energy dispersive X-ray spectrometer （EDX）. The c... The Ni-P/TiO2 composite film on sintered NdFeB permanent magnet was investigated by X-ray diffraction （XRD）,environmental scanning electron microscopy （ESEM）,and energy dispersive X-ray spectrometer （EDX）. The corrosion resistance of Ni-P/TiO2 film coated on NdFeB magnet,in 0.5 mol/L NaCl solution,was studied by potentiodynamic polarization,salt spray test and electrochemical impedance spectroscopy （EIS） techniques. The self-corrosion current density （icorr） and the polarization resistance （Rp） of Ni-P/TiO2 film are 0.22 μA/cm2 （about 14% of that of Ni-P coating）,and 120 kΩ·cm2 （about 2 times of that of Ni-P coating）,respectively. The anti-salt spray time of Ni-P/TiO2 film is about 2.5 times of that of the Ni-P coating. The results indicate that Ni-P/TiO2 film has a better corrosion resistance than Ni-P coating,and the composite film increases the corrosion resistance of NdFeB magnet markedly. 展开更多
关键词 sintered NdFeB permanent magnet Ni-P/TiO2 composite film sodium chloride solution corrosion resistance
暂未订购 下载PDF
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
8
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
暂未订购 下载PDF
PREPARATION AND CORROSION RESISTANCE OF NiP/TiO_2 COMPOSITE FILM ON CARBON STEEL IN SULFURIC ACID SOLUTION 认领 引用 被引量：5
9
作者 L.Z. Song S.Z. Song J. Zhao 《Acta Metallurgica Sinica(English Letters)》 EI CAS 2006年第2期117-123,共7页
A NiP/TiO2 composite film on carbon steel was prepared by electroless plating and sol-gel composite process. An artificial neural network was applied to optimize the prepared condition of the composite film. Corrosion... A NiP/TiO2 composite film on carbon steel was prepared by electroless plating and sol-gel composite process. An artificial neural network was applied to optimize the prepared condition of the composite film. Corrosion behavior of the NiP/TiO2 composite film was investigated by polarization resistance measurement, anode polarization, ESEM （environmental scanning electron microscopy） and EIS （electrochemical impedance spectroscopy） measurements. Results showed that the NiP/ TiO2 composite film has a good corrosion resistance in 0.5mol/L H2SO4 solution. The element valence of the composite film was characterized by XPS （X-ray photoelectron spectroscopy） spectrum, and an anticorrosion mechanism of the composite film was discussed. 展开更多
关键词 electroless plating and sol-gel composite process artificial neural network NiP/TiO2 composite film corrosion resistance
暂未订购 下载PDF
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
10
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
暂未订购 下载PDF
Preparation of NaYF_4:Er3+/TiO_2 composite and up-conversion luminescence properties under visible light excitation 认领 引用 被引量：3
11
作者 叶岩溪 胡晓云 +6 位作者 闫志云 刘恩周 樊君 张德恺 苗慧 商毅博 杨娟 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第8期449-453,共5页
The up-conversion luminescence composite NaYF4：Er3＋/TiO2 is prepared using the sol-gel method. The specimen has good crystallinity and two shapes, i.e., viereck and round, while the sizes of viereck and round partic... The up-conversion luminescence composite NaYF4：Er3＋/TiO2 is prepared using the sol-gel method. The specimen has good crystallinity and two shapes, i.e., viereck and round, while the sizes of viereck and round particles are both micron-sized. The TiO2 has an anatase structure, while the NaYF4 has a hexagonal phase, which can be hardly obtained through the common sol-gel method. Due to the big particle size and the high crystallinity of pure NaYF4： Er3＋, the composite has a small specific surface area that is less than Degussa P25 TiO2. The NaYF4：Er3＋/TiO2 composite shows several emission peaks at 211, 237, and 251 nm under the excitation of 388 nm, at 395 nm and 411 nm under the excitation of 500 nm, and at 467, 481,492, and 508 nm under the excitation of 570 nm. 展开更多
关键词 ~p-conversion luminescence NaYF4：Er3＋/TiO2 composite excitation of visible light
暂未订购 下载PDF
Construction of SiO2-TiO2/g-C3N4 composite photocatalyst for hydrogen production and pollutant degradation: Insight into the effect of SiO2 认领 引用 被引量：1
12
作者 Sijia Sun Hao Ding +5 位作者 Lefu Mei Ying Chen Qiang Hao Wanting Chen Zhuoqun Xu Daimei Chen 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第9期2287-2294,共8页
Using low-cost precipitated silica(SiO2) as the carrier,a ternary SiO2-TiO2/g-C3N4 composite photocatalyst was prepared via the sol-gel method associated with a wet-grinding process.The asprepared composite exhibits p... Using low-cost precipitated silica(SiO2) as the carrier,a ternary SiO2-TiO2/g-C3N4 composite photocatalyst was prepared via the sol-gel method associated with a wet-grinding process.The asprepared composite exhibits photocatalytic hydrogen production and pollutant degradation performance under solar-like irradiation.The effect of SiO2 carrier on the properties of the heterostructure between TiO2 and g-C3N4(CN) was systematically studied.It is found that SiO2 has important effects on promoting the interaction between TiO2 and CN.The particle size of TiO2 and CN was obviously reduced during the calcination process due to the effects of SiO2.Especially,the TiO2 particles exhibit monodispersed state with particle size below 10 nm(quantum dots),resulting in the improvement of the contact area and the interaction betweenTiO2 and CN,and leading to the formation of efficient TiO2/CN Zscheme heterostructure in SiO2-TiO2/CN.Besides,the introduction of SiO2 can increase the specific surface area and light absorption of SiO2-TiO2/CN,further promoting the photocatalytic reaction.As expected,the optimum SiO2-TiO2/CN composite exhibits 12.3,3.1 and 2.9 times higher photocatalytic hydrogen production rate than that of SiO2-TiO2,CN and TiO2/CN under solar-like irradiation,while the photocatalytic active component in SiO2-TiO2/CN is only about 60 wt%.Moreover,the rhodamine B degradation rate of SiO2-TiO2/CN is also higher than that of SiO2-TiO2,CN and TiO2/CN. 展开更多
关键词 SiO2 carrier Heterostructure Photocatalyst g-C3N4 TiO2
暂未订购 下载PDF
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
13
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
暂未订购 下载PDF
Grain Size and Wettability of TiO_2/SiO_2 Photocatalytic Composite Thin Filing 认领 引用 被引量：12
14
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
暂未订购 下载PDF
Fabrication and characterization of SiO2(f)/Si)_3N_4 composites 认领 引用 被引量：4
15
作者 Yongsheng Liu Laifei Cheng 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 ... 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
暂未订购 下载PDF
Sol-Gel Preparation of TiO2/SiO2 Nanocomposites and Their Application in Self- cleaning Textiles 认领 引用
16
作者 LI Wan-di LIU Jun +3 位作者 TANG Hong-yu XUE Hai-jun GAO Jing WANG Lu 《Journal of Donghua University(English Edition)》 EI CAS 2014年第5期589-594,共6页
The present study involves the preparation of TiO 2/ SiO 2nanocrystals and their application in self-cleaning wool-polyester fabrics.The TiO 2/ SiO 2nanocrystals were successfully synthesized and deposited onto wool-p... The present study involves the preparation of TiO 2/ SiO 2nanocrystals and their application in self-cleaning wool-polyester fabrics.The TiO 2/ SiO 2nanocrystals were successfully synthesized and deposited onto wool-polyester fabrics using the low-temperature sol-gel technique.The as-prepared nanocomposites and the nanocomposites coated samples were characterized by X-ray diffraction( XRD) and scanning electron microscopy( SEM),respectively.The XRD and SEM results showed that the single-phase anatase nanocrystallites were formed and loaded on the fabric surface successfully.The photocatalytic activities of TiO 2-coated and TiO 2/ SiO 2-coated wool-polyester fabrics were measured by studying photodegradation of methylene blue dye.Comparison of the photocatalytic activity of the coated samples reveals superiority of TiO 2/ SiO 2modified sample with respect to that of pure TiO 2modified sample.Our observations indicate that by applying this technique to the fabrics,self-cleaning materials can be designed for practical application. 展开更多
关键词 wool-polyester fabrics TiO2/SiO2 sol-gel photocatalytic self-cleaning
暂未订购 下载PDF
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
17
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.
暂未订购 下载PDF
Photocatalytic and Thermal Insulating Performances of Fiber Reinforced Hierarchical TiO_2/SiO_2 Xerogel Composites Synthesized by Ambient Drying Route 认领 引用
18
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
暂未订购 下载PDF
Preparation of Al_2O_3-SiO_2-TiO_2-ZrO_2 Composite Ceramic Membranes by Sol-Gel Method 认领 引用
19
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
暂未订购 下载PDF
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
20
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
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 32 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈