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Joining of SiO2 ceramic and TC4 alloy by nanoparticles modified brazing filler metal 认领 引用 被引量：17
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作者 Hong BIAN Yanyu SONG +3 位作者 Duo LIU Yuzhen LEI Xiaoguo SONG Jian CAO 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2020年第1期383-390,共8页
Nano-Al2O3 particles modified Ag Cu Ni filler was adopted to braze the SiO2 ceramic and TC4.The effects of filler size as well as the brazing temperature on the interfacial microstructure and mechanical property of th... Nano-Al2O3 particles modified Ag Cu Ni filler was adopted to braze the SiO2 ceramic and TC4.The effects of filler size as well as the brazing temperature on the interfacial microstructure and mechanical property of the joints were investigated.Nanoscale filler reduced the phases dimension and promoted the homogeneous distribution of microstructure,obtaining a higher joint strength when compared to microscale filler.The increase of brazing temperature made the accelerating dissolution and diffusion of Ti,which promoted the increase of thickness of Ti4O7+TiSi2 layer adjacent to SiO2 ceramic and diffusion layer zone nearby TC4 alloy.The hypoeutectic structure was produced in the brazing seam due to the high Ti content.The maximum shear strength of^40 MPa was obtained at 950°C for 10 min. 展开更多
关键词 Brazing Microstructure Nanoparticles modified filler SiO2 ceramic TC4
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Pulmonary Toxicity in Rats Caused by Exposure to Intratracheal Instillation of SiO2 Nanoparticles 认领 引用 被引量：5
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作者 YANG Hong WU Qiu Yun +2 位作者 LI Ming Yue LAO Can Shah ZHANG Ying Jian 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 2017年第4期264-279,共16页
Objective The effect of the silica nanoparticles（SNs） on lungs injury in rats was investigated to evaluate the toxicity and possible mechanisms for SNs.Methods Male Wistar rats were instilled intratracheally with 1 ... Objective The effect of the silica nanoparticles（SNs） on lungs injury in rats was investigated to evaluate the toxicity and possible mechanisms for SNs.Methods Male Wistar rats were instilled intratracheally with 1 mL of saline containing 6.25,12.5,and 25.0 mg of SNs or 25.0 mg of microscale SiO_2 particles suspensions for 30 d,were then sacrificed.Histopathological and ultrastructural change in lungs,and chemical components in the urine excretions were investigated by light microscope,TEM and EDS.MDA,NO and hydroxyproline（Hyp） in lung homogenates were quantified by spectrophotometry.Contents of TNF-α,TGF-β1,IL-1β,and MMP-2 in lung tissue were determined by immunohistochemistry staining.Results There is massive excretion of Si substance in urine.The SNs lead pulmonary lesions of rise in lung/body coefficients,lung inflammation,damaged alveoli,granuloma nodules formation,and collagen metabolized perturbation,and lung tissue damage is milder than those of microscale SiO_2 particles.The SNs also cause increase lipid peroxidation and high expression of cytokines.Conclusion The SNs result into pulmonary fibrosis by means of increase lipid peroxidation and high expression of cytokines.Milder effect of the SNs on pulmonary fibrosis comparing to microscale SiO_2 particles is contributed to its elimination from urine due to their ultrafine particle size. 展开更多
关键词 Silica （SiO2） nanoparticles Collagen synthesis Lipid peroxidation, Cytokines Pulmonarytoxicity
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TiO2-Ag双功能涂层协同修饰的SiO基复合负极材料制备及高容量锂离子存储性能研究 认领 引用
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作者 吴霞 张海燕 洪浩群 《新能源进展》 CSCD 北大核心 2026年第2期167-175,共9页
为满足锂离子电池领域对高容量、长寿命储能技术的迫切需求,硅基负极材料因其高理论容量优势成为产业化应用研究的重点。然而,硅(Si)在锂化过程中严重的体积膨胀制约了其应用。与Si相比,一氧化硅(SiO)的体积膨胀虽有所降低,但仍存在本... 为满足锂离子电池领域对高容量、长寿命储能技术的迫切需求,硅基负极材料因其高理论容量优势成为产业化应用研究的重点。然而,硅(Si)在锂化过程中严重的体积膨胀制约了其应用。与Si相比,一氧化硅(SiO)的体积膨胀虽有所降低,但仍存在本征电导率低和初始库仑效率低等问题。为解决SiO材料的缺陷,采用二氧化钛(TiO2)和银(Ag)双功能涂层修饰策略,通过球磨法和溶胶凝胶法制备了TiO2和Ag双涂层修饰的SiO基复合材料(D-SiO@TiO2@Ag)。电化学测试表明,在0.2 A/g电流密度下,该复合材料经过100次循环后可逆容量为1164.3 mA·h/g,容量保持率为73.29%,显著高于未修饰SiO的547.9 mA·h/g和34.16%。D-SiO@TiO2@Ag复合材料结合了SiO的高容量和TiO2的缓解体积膨胀优势,同时通过Ag纳米颗粒提升了导电性和电荷传输性能,为新一代高容量、高稳定性的硅基负极材料提供了设计思路。 展开更多
关键词 纳米复合材料 锂离子电池 硅基负极 银纳米颗粒 SiO TiO2
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Synthesis of Ultraviolet Absorber Benzotriazole by Nanoparticles Ag/SiO_2 Catalytic Hydrogenation 认领 引用 被引量：1
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作者 祁刚 张文国 戴勇 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2012年第12期1810-1814,共5页
The Ag/SiO2 nanoparticles had been successfully synthesized. The Ag/SiO2 nano- particles can be an excellent catalyst for the synthesis of ultraviolet absorber benzotriazole by catalytic hydrogenation. The synthesis r... The Ag/SiO2 nanoparticles had been successfully synthesized. The Ag/SiO2 nano- particles can be an excellent catalyst for the synthesis of ultraviolet absorber benzotriazole by catalytic hydrogenation. The synthesis route is very efficient with less pollution and excellent yields. It is also easy to industrialized production. 展开更多
关键词 Ag/SiO2 nanoparticles catalyst benzotriazole
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Biosensor Based on TTF@SiO_2 Nanoparticles as Electron Transfer Mediator for the Determination of Glucose 认领 引用 被引量：1
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作者 LI Xiao-hua XIAN Yue-zhong MIN Hong LI Chen-xin XIE Zong-hong ZHANG Fen-fen JIN Li-tong 《Chemical Research in Chinese Universities》 SCIE EI CAS 2006年第4期474-478,共5页
Tetrathiafulvalene（TTF） was doped in an SiO2 network and the resulting nanocompesite was used as a mediator for the selective detection of glucose. The uniform TTF-doped silica（TIT@SiO2 ） nanoparticles were prepar... Tetrathiafulvalene（TTF） was doped in an SiO2 network and the resulting nanocompesite was used as a mediator for the selective detection of glucose. The uniform TTF-doped silica（TIT@SiO2 ） nanoparticles were prepared by the water-in-oil（W/O） microemulsion method, and were characterized by transmission electron microscopy（TEM）. The core-shell structure TTF@ SiO2 could prevent TIT from leaching out into an aqueous solution. Combined with chitosan （CHIT）, which serves as a scaffold for glucose oxidase and nanocomposite immobilization, the GCE/TTF@ SiO2- CHIT-GOx biosensor was developed. Under optimal conditions, the biosensors exhibit a linear range of 1.0 × 10^-5 5 × 10^-3 mol/L with a detection limit down to 5.0 μmol/L（S/N = 3 ）. The excellent selectivity, sensitivity, and stability of the glucose biosensor show its potential for practical applications. 展开更多
关键词 TTF@ SiO2 nanoparticle Chitosan Glucose Biosensor
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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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Performance optimization of dye-sensitized solar cells by gradient-ascent architecture of SiO_2@Au@TiO_2 microspheres embedded with Au nanoparticles 认领 引用 被引量：2
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作者 Mingyue Li Na Yuan +5 位作者 Yiwen Tang Ling Pei Yongdan Zhu Jiaxian Liu Lihua Bai Meiya Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2019年第4期604-609,共6页
Highly homogeneous, well dispersed SiO_2@Au@TiO_2(SAT) microspheres decorated with Au nanoparticles(AuNPs) were prepared and incorporated into the photoanode with an optimized concentration gradientascent. The effects... Highly homogeneous, well dispersed SiO_2@Au@TiO_2(SAT) microspheres decorated with Au nanoparticles(AuNPs) were prepared and incorporated into the photoanode with an optimized concentration gradientascent. The effects of SAT microspheres and the gradient-ascent architecture on the light absorption and the photoelectric conversion efficiency(PCE) of the dye-sensitized solar cells(DSSCs) were investigated.Studies indicate that the introduction of SAT microspheres and the gradient-ascent architecture in the photoanode significantly enhance the light scattering and harvesting capability of the photoanode. The DSSC with the optimized SAT gradient-ascent photoanode has the maximum short circuit current density(Jsc) of 17.7 mA cm-2 and PCE of 7.75%, remarkably higher than those of the conventional DSSC by 23.7%and 28.0%, respectively. This significantly enhancement of the performance of the DSSC can be attributed to the excellent light reflection/scattering of SAT, the localized surface plasma resonance(LSPR) effect of AuNPs within the microspheres, and the gradient-ascent architecture of SAT microspheres inside the photoanode. This study demonstrates that the tri-synergies of the scattering of SAT microspheres, the LSPR of AuNPs and the gradient-ascent architecture can effectively improve the PCE of DSSC. 展开更多
关键词 SiO2@Au@TiO2 microspheres Au nanoparticles Localized surface plasmon resonance Gradient-ascent architecture scattering Dye-sensitized solar cells
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Enhanced hyperthermia performance in hard-soft magnetic mixed Zn0.5CoxFe2.5−xO4/SiO2 composite magnetic nanoparticles 认领 引用
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作者 Xiang Yu Li-Chen Wang +3 位作者 Zheng-Rui Li Yan Mi Di-An Wu Shu-Li He 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第3期409-415,共7页
High quality Zn0.5CoxFe2.5−xO4(x=0,0.05,0.1,0.15)serial magnetic nanoparticles with single cubic structures were prepared by the modified thermal decomposition method,and Zn0.5CoxFe2.5−xO4/SiO2 composite magnetic nano... High quality Zn0.5CoxFe2.5−xO4(x=0,0.05,0.1,0.15)serial magnetic nanoparticles with single cubic structures were prepared by the modified thermal decomposition method,and Zn0.5CoxFe2.5−xO4/SiO2 composite magnetic nanoparticles were prepared by surface modification of SiO2.The magnetic anisotropy of the sample increases with the increase of the doping amount of Co2+.When the doping amount is 0.1,the sample shows the transition from superparamagnetism to ferrimagnetism at room temperature.In the Zn0.5CoxFe2.5−xO4/SiO2 serial samples,the maximum value of specific loss power(SLP)with 1974 W/gmetal can also be found at doping amount of x=0.1.The composite nanoparticles are expected to be an excellent candidate for clinical magnetic hyperthermia. 展开更多
关键词 magnetic nanoparticles magnetic anisotropy Zn0.5CoxFe2.5−xO4/SiO2 magnetic hyperthermia
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Calculation of photon attenuation coefficient and dose rate in concrete with the addition of SiO_2 and MnFe_2O_4 nanoparticles using MCNPX code and comparison with experimental results 认领 引用
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作者 M.Hassanzadeh S.M.Sadat Kiai 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2018年第11期152-158,共7页
One of the most important safety features of nuclear facilities is the shielding material used to protect the operating personnel from radiation exposure. The most common materials used in radiation shielding are conc... One of the most important safety features of nuclear facilities is the shielding material used to protect the operating personnel from radiation exposure. The most common materials used in radiation shielding are concretes. In this study, a Monte Carlo N-Particle eXtended code is used to calculate the gamma-ray attenuation coefficients and dose rates for a new concrete material composed of MnFe_2O_4 nanoparticles, which is then compared with the theoretical and experimental results obtained for a SiO_2 nanoparticle concrete material. According to the results, the average relative differences between the simulations and the theoretical and experimental results for the linear attenuation coefficient(l) in the SiO_2 nanoparticle materials are 6.4% and 5.5%, respectively. By increasing the SiO_2 content up to 1.5% and the temperature of MnFe_2O_4 up to 673 K, l is increased for all energies. In addition, the photon dose rate decreases up to 9.2% and3.7% for MnFe_2O_4 and SiO_2 for gamma-ray energies of0.511 and 1.274 MeV, respectively. Therefore, it was concluded that the addition of SiO_2 and MnFe_2O_4 nanoparticles to concrete improves its nuclear properties and could lead to it being more useful in radiation shielding. 展开更多
关键词 Shielding Radiation Concrete Attenuation coefficient Photon dose MCNPX code SiO2 and MnFe2O4 nanoparticles
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通过静电相互作用制备CdTe/SiO_2纳米复合物 认领 引用 被引量：5
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作者 赵奎 李军 +4 位作者 王林 潘凯 刘艳梅 白玉白 李铁津 《高等学校化学学报》 SCIE EI CAS 北大核心 2005年第6期1106-1109,共4页
以四乙氧基硅烷(TEOS)为原料,在乙醇相中制备了尺寸为80nmSiO2纳米粒子,用3-氨基丙基三乙氧基硅烷对SiO2纳米粒子进行了氨基化.以巯基乙酸为配体,在水相中合成了CdTe纳米晶.通过静电相互作用,CdTe纳米晶被吸附到氨基化的二氧化硅球的表... 以四乙氧基硅烷(TEOS)为原料,在乙醇相中制备了尺寸为80nmSiO2纳米粒子,用3-氨基丙基三乙氧基硅烷对SiO2纳米粒子进行了氨基化.以巯基乙酸为配体,在水相中合成了CdTe纳米晶.通过静电相互作用,CdTe纳米晶被吸附到氨基化的二氧化硅球的表面上.研究了两种粒子复合后引起的CdTe纳米晶发光光谱的变化. 展开更多
关键词 CdTe纳米晶 二氧化硅微球 静电作用 CdTe/SiO2复合物
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Synthesis of CdTe/SiO2Composites and Their Fluorescence Properties 认领 引用 被引量：1
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作者 WANG Mei-ping LIN Jin-hui SHAN Chuan-sheng 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2011年第4期540-542,共3页
Thioglycolic acid(TGA)-stabilized CdTe nanocrystals(NCs)were prepared with sodium tellurite as tellurium source,which avoids the cumbersome processes associated with H2Te or NaHTe sources.Fluorescent CdTe/SiO2 composi... Thioglycolic acid(TGA)-stabilized CdTe nanocrystals(NCs)were prepared with sodium tellurite as tellurium source,which avoids the cumbersome processes associated with H2Te or NaHTe sources.Fluorescent CdTe/SiO2 composites were synthesized by a sol-gel method without the exchange of surface ligands.The phase structure of CdTe NCs was investigated by X-ray diffractometry.For comparison,some characterizations were done for both the CdTe NCs and the composites.CdTe NCs and CdTe/SiO2 composites were characterized with TEM,digital camera and fluorescence spectrophotometer.The stability of CdTe NCs and the composites were investigated in phosphate-buffered saline(PBS)buffer and the fluorescent properties of the composites were discussed in detail. 展开更多
关键词 CdTe nanocrystal Sodium tellurite CdTe/SiO2
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新型C[6]/SiO_2/CdTe NPs荧光探针对乙二胺的识别和检测 认领 引用 被引量：5
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作者 李涛 胡青大 唐冬宝 《化工管理》 2015年第16期184-185,共2页
基于杯芳烃对分子的识别特性和量子点的高荧光特性，合成了脱叔丁基杯[6]芳烃的溶胶凝胶修饰二氧化硅包覆的碲化镉半导体纳米粒子，得到了新型的水溶性复合纳米粒子，并用。HNMR谱图、红外光谱、荧光光谱、紫外光谱、透射电镜进行了表... 基于杯芳烃对分子的识别特性和量子点的高荧光特性，合成了脱叔丁基杯[6]芳烃的溶胶凝胶修饰二氧化硅包覆的碲化镉半导体纳米粒子，得到了新型的水溶性复合纳米粒子，并用。HNMR谱图、红外光谱、荧光光谱、紫外光谱、透射电镜进行了表征，并以新型的水溶性复合纳米粒子为荧光探针对客体分子乙二胺进行了识别和检测，使得乙二胺在5．0～150．0nmol·L^-1范围内具有良好的线性关系，r=0．99913，最低检出限为5．7Onmol·L^-1。此荧光探针与客体分子乙二胺之间的相互作用，借以朗缪尔等温式加以解释，验证了新型的荧光探针对分子的识别具有高灵敏度、高荧光性、高选择性和高稳定性等优越特点。 展开更多
关键词 量子点 6/SiO2/CdTe NPs荧光探针 乙二胺 荧光探针 识别 检测
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Synthesis and fluorescence properties of CdTe:Eu3+ nanocrystals and core-shell SiO2-coated CdTe:Eu3+ nanospheres 认领 引用 被引量：4
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作者 Jun-Fang Gao Jun-Hong Yang +3 位作者 Xiao-Yong Zhang Jun Zhao Xing-Wang Liu Bing-Feng Shi 《Rare Metals》 SCIE EI CAS CSCD 2019年第10期989-995,共7页
Eu3+ doped-CdTe(CdTe:Eu3+)nanocrystals were prepared via a facile hydrothermal method,and Eu3+ was successfully incorporated into the crystal lattice of CdTe and measured by X-ray powder diffraction(XRD),transmission ... Eu3+ doped-CdTe(CdTe:Eu3+)nanocrystals were prepared via a facile hydrothermal method,and Eu3+ was successfully incorporated into the crystal lattice of CdTe and measured by X-ray powder diffraction(XRD),transmission electron microscopy(TEM),ultraviolet-visible(UV-Vis) absorption spectroscopy and fluorescence emission.The CdTe:Eu^3+ nanocrystals still have a cubic crystal structure,and the corresponding XRD peaks of CdTe:Eu3+nanocrystals shift to larger angles compared with those of pure CdTe.The CdTe:Eu3+ nanocrystals are monodisperse and the particles size is about 2-4 nm.Compared with pure CdTe,the CdTe:Eu^3+ nanocrystals have larger band gap and thus exhibit blueshift in the emission spectra,which could be accounted for by the energy transfer between Eu^3+ and CdTe.To enhance the stability and functionality of CdTe:Eu3+nanocrystals,the CdTe:Eu3+nanocrystals were coated with SiO2 and the core-shell SiO2-coated CdTe:Eu3+nanocrystals(CdTe:Eu^3+@SiO2) were prepared via microemulsion method.TEM results show that CdTe:Eu3+nanocrystals are uniformly dispersed in the shell,and CdTe:Eu3+@SiO2 nanospheres are uniformly spherical with an average diameter of about 75 nm.The fluorescence emission of CdTe:Eu3+@SiO2(567 nm) shows a blueshift compared with that of CdTe:Eu^3+nanocrystals(632 nm),possibly because of altered surface properties after SiO2 coating.CdTe:Eu^3+and CdTe:Eu^3+@SiO2 with tunable photoluminescence are potentially useful in fabricating optical and bioimaging devices. 展开更多
关键词 CdTe:Eu^3+nanocrystals Doping Core-shell SiO2 Fluorescent properties
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SiO2@CdTe@Au复合纳米粒子的制备与非线性吸收特性 认领 引用 被引量：1
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作者 常青 管静 孟天明 《无机化学学报》 SCIE CAS CSCD 北大核心 2021年第9期1683-1690,共8页
应用SiO2纳米粒子、CdTe量子点和Au纳米粒子,采用逐层吸附法制备SiO2@CdTe@Au纳米复合材料。同时对样品进行了测试和表征,从多个方面证明纳米复合材料成功制备。利用Z扫描技术测量了SiO2@CdTe和SiO2@CdTe@Au纳米复合材料在... 应用SiO2纳米粒子、CdTe量子点和Au纳米粒子,采用逐层吸附法制备SiO2@CdTe@Au纳米复合材料。同时对样品进行了测试和表征,从多个方面证明纳米复合材料成功制备。利用Z扫描技术测量了SiO2@CdTe和SiO2@CdTe@Au纳米复合材料在纳秒激光脉冲作用下的非线性吸收光学特性。实验结果表明:SiO2@CdTe和SiO2@CdTe@Au纳米复合材料均表现出饱和吸收特性。SiO2@CdTe@Au较SiO2@CdTe纳米复合材料具有更强的非线性光学特性,并对其机理进行了分析。 展开更多
关键词 SiO2@CdTe@Au 复合纳米粒子 Z扫描 非线性吸收
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Zr(Ⅳ) surface sites determine CH3OH formation rate on Cu/ZrO2/SiO2-CO2 hydrogenation catalysts 认领 引用 被引量：3
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作者 Erwin Lam Kim Larmier +3 位作者 Shohei Tada Patrick Wolf Olga V. Safonova Christophe Copéret 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第11期1741-1748,共8页
Cu/ZrO2/SiO2 are efficient catalysts for the selective hydrogenation of CO2 to CH3OH. In order to understand the role of ZrO2 in these mixed-oxides based catalysts, in situ X-ray absorption spectroscopy has been carri... Cu/ZrO2/SiO2 are efficient catalysts for the selective hydrogenation of CO2 to CH3OH. In order to understand the role of ZrO2 in these mixed-oxides based catalysts, in situ X-ray absorption spectroscopy has been carried out on the Cu and Zr K-edge. Under reaction conditions, Cu remains metallic, while Zr is present in three types of coordination environment associated with 1) bulk ZrO2, 2) coordinatively saturated and 3) unsaturated Zr(Ⅳ) surface sites. The amount of coordinatively unsaturated Zr surface sites can be quantified by linear combination fit of reference X-Ray absorption near edge structure (XANES) spectra and its amount correlates with CH3OH formation rates, thus indicating the importance of Zr(Ⅳ) Lewis acid surface sites in driving the selectivity toward CH3OH. This finding is consistent with the proposed mechanism, where CO2 is hydrogenated at the interface between the Cu nanoparticles that split H2 and Zr(Ⅳ) surface sites that stabilizes reaction intermediates. 展开更多
关键词 CO2 hydrogenation ZrO2/SiO2 supported Cu nanoparticles Lewis acidic surface sites In situ X-ray absorption spectroscopy
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INTERACTION BETWEEN POLY (ETHYLENE OXIDE) AND SILICA NANOPARTICLES IN DILUTE SOLUTIONS 认领 引用 被引量：1
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作者 Da-peng Wang Mu-quan Yang +2 位作者 Zhi-xin Dong Shu-qin Bo Xiang-ling Ji 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2013年第9期1290-1298,共9页
A mixed system that includes poly（ethylene oxide） （PEO） and silica （SiO2） nanoparticles is prepared using two mixing methods. The interaction between PEO and the SiO2 nanoparticles in the dilute basic solution i... A mixed system that includes poly（ethylene oxide） （PEO） and silica （SiO2） nanoparticles is prepared using two mixing methods. The interaction between PEO and the SiO2 nanoparticles in the dilute basic solution is investigated using the dynamic tight scattering （DLS） and isothermal titration calorimetry （ITC） techniques. The DLS results show qualitatively that SiO2 nanoparticles interact with both random coils and aggregates of PEO through hydrogen bonding, and PEO-SiO2 complexes are formed. The degree of disaggregation of aggregates of PEO is readily adjusted by changing the concentration of SiO2 nanoparticle suspensions. Moreover, the ITC results also certify quantitatively the interaction between PEO and SiO2 nanoparticle, and give the evidence of formation of PEO-SiO2 complex. 展开更多
关键词 PEO SiO2 nanoparticles Hydrogen bonding Disaggregation Mixing method Depletion interaction.
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荧光CdTe量子点和CdTe/SiO2纳米粒子的制备与表征 认领 引用
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作者 张春富 徐万帮 +4 位作者 汪勇先 李峥 张国欣 许凤华 尹端芷 《功能材料》 EI CAS 北大核心 2007年第A6期2174-2176,共3页
采用巯基乙酸为稳定剂，在水相中直接合成了不同荧光发射波长的CdTe量子点（QDs），在此基础上，采用反相微乳法对所获得的QDs进行硅烷化处理，得到大小均一、水溶性好的CdTe／SiO2纳米粒子，为该材料的进一步生物应用奠定了良好的基础。
关键词 CdTe量子点 荧光 CdTe/SiO2复合粒子
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Colloidal Dispersion of Nano-Ru/SiO_2 in PEG and its Application for Hydrogenation of Benzene 认领 引用
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作者 Yu Chuan YANG Yan CHEN Yan Hua WANG Jing Yang JIANG Zi Lin JIN 《Chinese Chemical Letters》 SCIE CAS 2006年第10期1413-1416,共4页
Colloidal dispersion of nano-Ru/SiO2 in PEG （polyethylene glycol, M.W.=400） was used for benzene hydrogenation. The system has the features of easy catalyst＇s recycling and high catalyst stability.
关键词 Ru nanoparticles PEG benzene hydrogenation nano-Ru/SiO2
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Preparation of Hydrophilic UHMWPE Hollow Fiber Membranes by Chemically Bounding Silica Nanoparticles 认领 引用 被引量：4
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作者 Lian-Lian Fan Jia-You Quan +3 位作者 Hao Zhang Jun-Rong Yu Zu-Ming Hu Yan Wang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2021年第2期189-200,I0006,共12页
In this work, ultra-high molecular weight polyethylene (UHMWPE) microfiltration hollow fiber membranes prepared via the thermally induced phase separation (TIPS) method were modified by chemically bounding hydrophilic... In this work, ultra-high molecular weight polyethylene (UHMWPE) microfiltration hollow fiber membranes prepared via the thermally induced phase separation (TIPS) method were modified by chemically bounding hydrophilic silica (SiO2) nanoparticles onto the surface to improve anti-fouling performance. A range of testing techniques including attenuated total reflection Flourier transformed infrared spectroscopy(ATR-FTIR), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), water contact angle, mechanical test,filtration and anti-fouling performance were carried out to discuss the influence of different modification conditions on the properties of the membranes. The prepared hollow fiber membranes display the significantly excellent performance when the vinyl trimethoxy silane (VTMS) concentration was 13%, the pH value of the hydrolyzate was 4 and the hydrolysis reaction time was 6 h. In particular, the hydrophilicity of modified membranes was improved effectively, resulting in the enhancement of membrane anti-fouling properties. The results of this work can be consulted for improving the anti-fouling performance of the UHMWPE microfiltration hollow fiber membrane applied in the field of water purification. 展开更多
关键词 Hollow fiber membrane Hydrophilic Anti-fouling Silica(SiO2)nanoparticles Water purification
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Structural and luminescence enhancement properties of Eu3+/Ag nanocrystallites doped SiO_2-TiO_2 matrices 认领 引用 被引量：2
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作者 Arun Kumar K V Revathy K P +3 位作者 Prathibha Vasudevan Sunil Thomas Biju P R Unnikrishnan N V 《Journal of Rare Earths》 SCIE EI CAS CSCD 2013年第5期441-448,共8页
We reported here the structural and optical characterisation of silver nanocrystallites/Eu3＋：SiO2-TiO2 matrices synthesised through sol-gel route. Structural characterisations were done by using energy dispersive sp... We reported here the structural and optical characterisation of silver nanocrystallites/Eu3＋：SiO2-TiO2 matrices synthesised through sol-gel route. Structural characterisations were done by using energy dispersive spectroscopy （EDX）, X-ray diffraction （XRD）, Fourier transform infrared spectroscopy （FTIR）, atomic force microscope （AFM） and transmission electron microscopy （TEM） measurements and optical characterisations were performed by absorption and emission spectroscopy. The TEM and XRD measurements confirmed the presence of nanocrystals. A broad absorption band was observed due to surface plasmon resonance of silver nanocrystals. The effect of silver nanocrystals on the emission spectrum of Eu3＋ doped SiO2-TiO2 matrices was discussed. An attempt was made to explain this fluorescence enhancement by invoking phenomena such as energy transfer, asymmetry ratio, surface plasmon, surface roughness, crystallinity and grain boundary. Our analysis, based on the experimental results, suggested that all the phenomena except crystallinity and grain boundary had favourable effects on fluorescence enhancement. We also estimated the relevant parameters associated with the phenomena that affected the fluorescence emission from the Eu3＋ ions in the matrix. It was seen that the theoretical estimate of fluorescence enhancement agreed well with the experimental estimate. 展开更多
关键词 sol-gel luminescence SiO2-TiO2 silver nanoparticles rare earths
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