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Reverse Microemulsion Synthesis of Monodispersed Square-shaped SnO2Nanocrystals 认领 引用 被引量：4
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作者 YU Chang-Lin ZHOU Wan-Qin +3 位作者 YANG Kai LI Li-Qing CHAO Fang-Fang LI Xin 《无机材料学报》 SCIE EI CAS 北大核心 2010年第12期1340-1344,共5页
A nanosized reverse microemulsion reactor was designed for the fabrication of monodispersed SnO2 nanosquares by oxidation of SnF2 under hydrothermal conditions.As-prepared samples were characterized by X-ray diffracti... A nanosized reverse microemulsion reactor was designed for the fabrication of monodispersed SnO2 nanosquares by oxidation of SnF2 under hydrothermal conditions.As-prepared samples were characterized by X-ray diffraction,scanning electron microscope,transmission electron microscope and high resolution transmission elec-tron microscope.The results show that the morphology of the SnO2 nanocrystals can be controlled by regulating the amount of the used oleylamine which direct influenced the pH values of the aqueous phase.Well monodispersed SnO2 nanosquares with the size around 10 nm can be obtained.A proper pH value could benefit the oriented attachments of the crystalline seeds which gradually grew into a square-plate NCs shape in the microemulsion reactor. 展开更多
关键词 reverse microemulsion SnO2nanosquares oleylamine hydrothcrmal
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Preparation and Characterization of CeO_2-ZrO_2 Solid Solution Ultrafine Particles Using Reversed Microemulsion 认领 引用 被引量：5
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作者 安源 李丽 +1 位作者 王军 沈美庆 《Journal of Rare Earths》 SCIE EI CAS 2005年第4期416-419,共4页
Ce0.6Zr0.4O2 solid solution ultrafine particle was prepared in the cyclohexane/water/OP-10-hexanol reversed microemulsion. The quasi-ternary phase diagram investigations showed that the system has narrow W/O type micr... Ce0.6Zr0.4O2 solid solution ultrafine particle was prepared in the cyclohexane/water/OP-10-hexanol reversed microemulsion. The quasi-ternary phase diagram investigations showed that the system has narrow W/O type microemulison region, so it is the proper system to prepare Ce0.6Zr0.4O2 solid solution ultrafine particle. Some physical-chemical techniques such as TG/DTA, XRD, BET, and HRTEM are used to characterize the resultant powders. The results show that the fluorite cubic Ce0.6Zr0.4O2 solid solution is obtained at 400 ℃. The surface area is （146.7 m^2·g^-1）, which is higher than the surface area for sol-gel prepared sample （59.5m^2·g^-1）. HRTEM images indicated that the Ce0.6Zr0.4O2 solid solution ultrafine particle is well-crystallized, narrow size distribution, less agglomeration, within mean size of 5 -7 nm. 展开更多
关键词 reverse microemulsion CeO2-ZrO2 solid solution ultrafine particle rare earths
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Synthesis of Cu_2O nanowhiskers with CTAB as a template in water-in-oil microemulsion system 认领 引用 被引量：1
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作者 YU Ying DU Feipeng +3 位作者 MA Lili LI Jialin ZHUANG Yuanyi QI Xinhua 《Rare Metals》 SCIE EI CAS 2005年第3期283-287,共5页
Dispersed cuprite （Cu2O） nanowhiskers were synthesized in a water/butanol/cyclohexane/cetyl trimethyl ammonium bromide （CTAB） water-in-oil microemulsion system at 25℃. The nanowhiskers with a diameter of about 8 ... Dispersed cuprite （Cu2O） nanowhiskers were synthesized in a water/butanol/cyclohexane/cetyl trimethyl ammonium bromide （CTAB） water-in-oil microemulsion system at 25℃. The nanowhiskers with a diameter of about 8 am exhibit a well-crystallized one-dimensional （1D） structure over several hundreds nanometers in length and mainly grow along the 〈111〉 direction. However, without CTAB, only cubic and hexagonal bulks are obtained. Without emulsifier, short and thick nanowhiskers can be prepared but they are apt to agglomerate. The possible growth mechanism of Cu2O nanowhiskers is speculated. The surfactant and the microemulsion system are related to the 1D shape formation and the even dispersion of Cu2O nanomaterials, respectively. 展开更多
关键词 Cu2O nanowhiskers microemulsion system CTAB preparation
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Microemulsion synthesis of ZnMn2O4/Mn3O4 sub-microrods for Li-ion batteries and their conversion reaction mechanism 认领 引用 被引量：6
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作者 Ting-ting FENG Jian YANG +2 位作者 Si-yi DAI Jun-chao WANG Meng-qiang WU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第1期265-276,共12页
The hierarchical ZnMn2O4/Mn3O4 composite sub-microrods were synthesized via a water-in-oil microemulsion method followed by calcination.The ZnMn2O4/Mn3O4 electrode displays an intriguing capacity increasing from 440 t... The hierarchical ZnMn2O4/Mn3O4 composite sub-microrods were synthesized via a water-in-oil microemulsion method followed by calcination.The ZnMn2O4/Mn3O4 electrode displays an intriguing capacity increasing from 440 to 910 mA·h/g at 500 mA/g during 550 consecutive discharge/charge cycles,and delivers an ultrahigh capacity of 1276 mA·h/g at 100 mA/g,which is much greater than the theoretical capacity of either ZnMn2O4 or Mn3O4 electrode.To investigate the underlying mechanism of this phenomenon,cyclic voltammetry and differential capacity analysis were applied,both of which reveal the emergence and the growth of new reversible redox reactions upon charge/discharge cycling.The new reversible conversions are probably the results of an activation process of the electrode material during the cycling process,leading to the climbing charge storage.However,the capacity exceeding the theoretical value indicates that there are still other factors contributing to the increasing capacity. 展开更多
关键词 ZnMn2O4/Mn3O4 sub-microrods microemulsion conversion reaction mechanism cyclic voltammetry differential capacity analysis
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STRUCTURAL STUDIES ON PROTEINS IN MICROEMULSION I.FTIR STUDY ON LYSOZYME IN D_2O/SURFACTANT/n-HEPTANE SYSTEM 认领 引用
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作者 Yan Ll Shi Fu WENG Jin Guang WU and Guang Xian XU 《Chinese Chemical Letters》 SCIE CAS 1994年第11期955-958,共4页
FTIR method was used in this paper to investigate the structure of lysozyme in D2O solution and in microemulsions.It was found from the subtraction spectra that the Amide Ⅰband shifts to lower wavenumbers in microemu... FTIR method was used in this paper to investigate the structure of lysozyme in D2O solution and in microemulsions.It was found from the subtraction spectra that the Amide Ⅰband shifts to lower wavenumbers in microemulsions. The assignment of deconvoluted AmideⅠbund was given.The curve-fitting resulte show that the α-helix structure of lysozyme is reduced a lot in microemulsions. 展开更多
关键词 FTIR STUDY MICROEMULSION LYSOZYME HEPTANE D2O
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对偶表面粗糙度对Nano-SiO2改性PTFE复合材料摩擦学性能的影响 认领 引用 被引量：12
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作者 高贵 李瑞红 +4 位作者 龚俊 王宏刚 杨东亚 任俊芳 陈生圣 《工程科学与技术》 EI CAS CSCD 北大核心 2020年第2期207-214,共8页
为了研究干摩擦条件下对偶面粗糙度对纳米粒子填充改性聚四氟乙烯(PTFE)摩擦学性能的影响,采用冷压成型、热烧结的工艺方法制备nano-SiO2填充改性PTFE复合材料;采用LSR–2M型往复摩擦磨损试验机评价了nano-SiO2改性PTFE复合材料与具有3... 为了研究干摩擦条件下对偶面粗糙度对纳米粒子填充改性聚四氟乙烯(PTFE)摩擦学性能的影响,采用冷压成型、热烧结的工艺方法制备nano-SiO2填充改性PTFE复合材料;采用LSR–2M型往复摩擦磨损试验机评价了nano-SiO2改性PTFE复合材料与具有3种不同表面粗糙度的对偶钢块(GCr15)之间的摩擦学特性;利用光学显微镜(OM)、扫描电子显微镜(SEM)和能谱仪(EDS)分别表征了转移膜及磨屑的形貌、微观结构以及化学成分,从微观角度揭示nano-SiO2改性PTFE复合材料的摩擦转移机理。试验结果表明:纯PTFE及不同含量nano-SiO2改性PTFE复合材料的摩擦系数随着对偶钢块表面粗糙度的增大整体呈现增大趋势,在粗糙度Ra为0.1的对偶表面上复合材料的摩擦系数随着nano-SiO2含量的增加变化相对较小;在3种不同粗糙度对偶表面上,nano-SiO2的加入均有效降低了PTFE的磨损体积,当填充比例为0.5%时复合材料在粗糙度Ra为1.2的对偶面上摩擦学性能最佳,磨合时间比纯PTFE缩短了近10 min,耐磨性比纯PTFE提高了33.3%;复合材料中nano-SiO2的含量与对偶表面粗糙度存在一定的协同效应,即填充适量nano-SiO2的PTFE复合材料与具有一定表面粗糙度的对偶钢块组成的摩擦配副能有效促进复合材料的摩擦转移,并能在对偶表面形成覆盖率高、均匀、连续、表面较粗糙且与摩擦方向趋向一致的转移膜,有利于降低材料的磨损。 展开更多
关键词 聚四氟乙烯 nano-SiO2 对偶表面粗糙度 摩擦转移 转移膜
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Influence of Nano-SiO2 Addition on Properties of Sulphoaluminate Cement Based Material 认领 引用 被引量：3
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作者 马保国 李海南 +1 位作者 MEI Junpeng LI Xiangguo 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第1期106-112,共7页
The influences of different nano-SiO2（NS） contents on the mechanical properties and rheological behavior of sulfoaluminate cement（SAC） based composite materials were studied.Results show that with increasing conte... The influences of different nano-SiO2（NS） contents on the mechanical properties and rheological behavior of sulfoaluminate cement（SAC） based composite materials were studied.Results show that with increasing content of NS,the apparent viscosity,and shearing strength of fresh paste gradually increase but the fluidity decreases.With a dosage of 3.0%NS,the tensile and flexural strengths of mortars at 56 days were increased by 87.0%and 84.6%,respectively,compared with that in the absence of NS,indicating that the toughness of hardened mortars is significantly improved.Besides,the exothermic peaks of hydration are obviously increased and will earlier occur,and the second and the third peaks appear 2.61 hours and 2.56 hours earlier,respectively than that in the absence of NS,and the hydration of SAC before 8 hours is accelerated.The forming mechanism of strengths was revealed by scanning electron microscopy（SEM）,hydration heat,X-ray diffraction（XRD） and derivative thermogravimetry（DTG）.The micro-aggregate filling effect and nucleation effect at early age and weak pozzolanic effect at late age of NS make the microstructure more compact,which obviously enhances the strength of SAC mortars. 展开更多
关键词 sulfoaluminate cement nano-SiO2 ettringite strengths hydration process
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石英和Nano-SiO2粉体对A549细胞炎性因子的影响 认领 引用 被引量：3
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作者 霍婷婷 董发勤 +3 位作者 邓建军 张青碧 代群威 王明翠 《矿物学报》 CAS CSCD 北大核心 2013年第3期402-407,共6页
采用体外培养的方法,研究了2种粒径的石英粉体(KWC-Q3和KWC-Q4)和纳米二氧化硅粉体(Nano-SiO2)对A549细胞存活率、乳酸脱氢酶(LDH)释放、白细胞介素(IL-6)和肿瘤坏死因子(TNF-α)的影响。结果表明Nano-SiO2对A549细胞的毒性作用最大,对K... 采用体外培养的方法,研究了2种粒径的石英粉体(KWC-Q3和KWC-Q4)和纳米二氧化硅粉体(Nano-SiO2)对A549细胞存活率、乳酸脱氢酶(LDH)释放、白细胞介素(IL-6)和肿瘤坏死因子(TNF-α)的影响。结果表明Nano-SiO2对A549细胞的毒性作用最大,对KWC-Q3其次,对KWC-Q4毒性最弱;随着暴露矿物粉体浓度的升高,细胞的死亡率明显升高,细胞释放的LDH随之升高,存在剂量效应关系。石英和Nano-SiO2能够引起A549细胞分泌IL-6的增加,但是并未引起TNF-α变化。 展开更多
关键词 石英 Nano-SiO2 细胞存活率 LDH IL-6 TNF-α
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Catalytic Activity of Ceria-Zirconia Nanostructured Materials Prepared via Reversed Microemulsion Method 认领 引用 被引量：5
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作者 An Yuan Zhu Lingyun +1 位作者 Wang Jun Shen Meiqing 《Journal of Rare Earths》 SCIE EI CAS 2005年第6期690-694,共5页
Single-phase homogeneous Ce1-x ZrxO2 solid versed microemulsion method.The structural properties solutions with various compositions were synthesized using the reand performance of Ce1-xZrxO2 were studied using XRD,BE... Single-phase homogeneous Ce1-x ZrxO2 solid versed microemulsion method.The structural properties solutions with various compositions were synthesized using the reand performance of Ce1-xZrxO2 were studied using XRD,BET,SEM,HRTEM,TPR and CO oxidation measurements.The results show that in the range of x=0.4-0.5 and x=0.6-1.0,the solid solutions posses the cubic and the tetragonal phase structure,respectively,Solids obtained by the reversed microemulsion method were more homogeneous on the whole range of composition,XRD investigations of the prepared materials did not show segregation of cerium or zirconium oxides,Highly uniform nanosize solid solution particles of ceria-zirconia with high specific area(146.7 m^2·g^-1)were attained under the conditions of this study.The TPR results and CO oxidation measurements indicate that the performance of the CeO2-ZrO2 mixed oxides is strongly related to the composition and structure of the oxides.Enhancement of the activity was found for the catalyst prepared by reversed microemulsion method as compared to the sample prepared by sol-gel method. 展开更多
关键词 CeO2-ZrO2 solid solution reversed microemulsion nanosize catalytic property carbon monoxide oxidation rare earths
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Freezing Resistance of HPC with Nano-SiO_2 认领 引用 被引量：5
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作者 王宝民 WANG Lijiu F C Lai 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2008年第1期85-88,共4页
The test of fast-freezing method is employed to research the freezing resistance of C60 and C80 high-performance concrete with nanometer-SiO2, and XRD and SEM are employed to analyze the mechanism of its influence. Th... The test of fast-freezing method is employed to research the freezing resistance of C60 and C80 high-performance concrete with nanometer-SiO2, and XRD and SEM are employed to analyze the mechanism of its influence. The experimental results show that the freezing resistance of high-performance concrete has been effectively improved. The compressive strength of C60, C70 and C80 high-performance concrete added with nano-SiO2 can be improved by 8%, 6% and 5% respectively, the weight loss can be reduced by 1%, 0.6% and 0.3% respectively and the relative dynamic elastic modulus can be improved by 7%, 4% and 6% respectively after the 300 times freeze-thaw cycle. 展开更多
关键词 nano-SiO2 high-performance concrete freezing resistance
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偶联剂SCA-3对CE/nano-SiO_2复合材料胶粘性的影响 认领 引用 被引量：6
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作者 张学英 张文根 祝保林 《中国胶粘剂》 CAS 北大核心 2010年第6期42-45,共4页
采用高速均质剪切法制备了氰酸酯树脂(CE)ano-SiO2复合材料,考察了经偶联剂(SCA-3)表面处理过的nano-SiO2对复合材料黏度和凝胶时间的影响。结果表明:SCA-3能够有效提高复合材料的黏度;当温度为100℃时,与未经偶联剂表面处理过的nano-Si... 采用高速均质剪切法制备了氰酸酯树脂(CE)ano-SiO2复合材料,考察了经偶联剂(SCA-3)表面处理过的nano-SiO2对复合材料黏度和凝胶时间的影响。结果表明:SCA-3能够有效提高复合材料的黏度;当温度为100℃时,与未经偶联剂表面处理过的nano-SiO2/CE复合材料相比,经SCA-3表面处理后的nano-SiO2/CE复合材料,其黏度相对提高率为13.42%,凝胶时间相对减小率为8.17%。 展开更多
关键词 氰酸酯树脂 偶联剂 nano-SiO2 胶粘性
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Synthesis of Waterborne Polyurethane Modified by Nano-SiO_2 Silicone and Properties of the WPU Coated RDX 认领 引用 被引量：4
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作者 Li Yang Zhao Tianbo +2 位作者 Qu Xiaoling Ding Hongjing Li Fengyan 《China Petroleum Processing & Petrochemical Technology》 CAS 2015年第2期39-45,共7页
A series of nano silica/silicone modified waterborne polyurethane(WPU) have been synthesized from polytetramethylene glycol and isophorone diisocyanate, dihydroxymethyl propionic acid and triethylamine, ethylenediamin... A series of nano silica/silicone modified waterborne polyurethane(WPU) have been synthesized from polytetramethylene glycol and isophorone diisocyanate, dihydroxymethyl propionic acid and triethylamine, ethylenediamine, trimethylolpropane, nano-SiO2 and the silane coupling agent KH550. The effect of the dosage of nano-SiO2 on the WPU-Si membrane and the coated RDX(cyclotrimethylenetrinitramine) particles have been studied in terms of their surface properties, mechanical properties, and thermal stability. The results showed that with the increase of Si content, the stability of the emulsion reduced gradually. The material with more Si content displayed an increased thermodynamic stability, an increased high temperature resistance, an increased tensile strength and a decreased elongation at break. With the increase of Si content, the surface tension of the material decreased, the bibulous rate reduced, and the contact angle increased gradually, so that the surface tension of the polyurethane and RDX are close to each other which could improve the performance of coating. 展开更多
关键词 nano-SiO2 organic silicon waterborne polyurethane coating of RDX
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Effect of Wet Surface Treated Nano-SiO2on Mechanical Properties of Polypropylene Composite 认领 引用 被引量：3
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作者 WANG Dongbo FENG Yujie +1 位作者 HAN Liwei TIAN Yan 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2008年第3期354-357,共4页
Nano-SiO2/polypropylene composite was prepared by melt-blending process.The nano-SiO2 particles were organized by wet process surface treatment with silane coupling agent KH-570.The effect of mass fraction of nano-SiO... Nano-SiO2/polypropylene composite was prepared by melt-blending process.The nano-SiO2 particles were organized by wet process surface treatment with silane coupling agent KH-570.The effect of mass fraction of nano-SiO2 particles and dosage of KH-570 on the toughening and strengthening of PP matrix were investigated based on the fractography of impact notch and the analysis of crystal structure by X-ray and dispersive structure of nano-SiO2 by TEM.Results show that the impact and flexural strength and modulus of the composite are improved obviously with low loading of nano-SiO2(3 wt%-5 wt%),and the izod impact strength of PP increases twice with 4 wt%nano-SiO2.The nano-SiO2 particles treated can disperse into the matrix resin,which has evident heterogeneous nucleation effects on the crystallization of PP.The optimal toughening and strengthening effects of PP matrix can be obtained when the content of nano-SiO2 and KH-570 are 4 wt%and 3 wt%,respectively. 展开更多
关键词 nano-SiO2 silane coupling agent wet process surface treatment polypropylene mechanical properties
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改性nano-SiO2/HDPE复合体系性能的研究 认领 引用 被引量：2
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作者 魏凤琴 薛涛 +1 位作者 曾舒 房春燕 《化工新型材料》 CAS 北大核心 2009年第1期63-65,共3页
采用母粒法将改性后的粉体SiO2与HDPE树脂混合、制样,并对样品的力学性能及粉体在基体树脂中的分散情况等进行了测试。结果表明:纳米SiO2对HDPE有一定的增强增韧作用;填充纳米SiO2的改性PE强度和韧性高于纯PE;随着纳米SiO2含量的增大,... 采用母粒法将改性后的粉体SiO2与HDPE树脂混合、制样,并对样品的力学性能及粉体在基体树脂中的分散情况等进行了测试。结果表明:纳米SiO2对HDPE有一定的增强增韧作用;填充纳米SiO2的改性PE强度和韧性高于纯PE;随着纳米SiO2含量的增大,复合材料的增强增韧效果越强.同时经过改性的SiO2在树脂中有很好的分散效果。 展开更多
关键词 nano-SiO2 HDPE 增强增韧
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Preparation of Nano-SiO_2/Amino-modified Polysiloxane Hybrid Superhydrophobic Coating and Thermal-stability Characterization 认领 引用 被引量：3
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作者 李金桦 翁睿 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第1期35-39,共5页
We put forward a large-area and cost-effective method to fabricate superhydrophobic coating by introducing in-situ functionalized nano-SiO2 into side-amino modified hydroxy-terminated polydimethylsiloxane （SA-HTPDMS... We put forward a large-area and cost-effective method to fabricate superhydrophobic coating by introducing in-situ functionalized nano-SiO2 into side-amino modified hydroxy-terminated polydimethylsiloxane （SA-HTPDMS） curing system. With the characterization using water contact angle （WCA） tester, Fourier transform infrared spectroscopy （FTIR）, scanning electron microscope （SEM）, atomic force microscopy （AFM） and simultaneous thermal analysis, the as-prepared coating displayed a tremendous WCA of 154.8±1°, sliding angle （SA） about 3.5° and stable self-cleaning property range from -10 to 80 ℃. It was also found that the synergistic effect of surface micro-nano hierarchical structure and chemical hydrophobicity, stability from matrix had made contributions to the superhydrophobicity and excellent heat resistance up to 300 ℃. 展开更多
关键词 nano-SiO2 amino-modified polysiloxane thermal-stability superhydrophobic
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Effect of Hyperbranched Poly(amine-ester) Grafted Nano-SiO_2 on Reinforcement and Toughness of PVC 认领 引用 被引量：2
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作者 李杰 赵辉 +1 位作者 孙瑞敏 罗运军 《Journal of Beijing Institute of Technology》 EI CAS 2008年第1期104-108,共5页
Nano-SiO2 was modified using silane coupling agent （KH-550） and hyperbranched poly（amine-ester） respectively, and Poly（vinyl chloride） （PVC）/modified nano-SiO2 composites were made by melt-blending. The compos... Nano-SiO2 was modified using silane coupling agent （KH-550） and hyperbranched poly（amine-ester） respectively, and Poly（vinyl chloride） （PVC）/modified nano-SiO2 composites were made by melt-blending. The composites＇ structures andmechanical properties were characterized by transmission electron microscopy（TEM）, sanning electronic microscopy（SEM） and electronic universal testing machine. The results. show that nano-SiO2 grafted by hyperbranched poly （amine-ester） increases obviously in dispersion in PVC matrix, and mechanical properties of PVC are effectively improved. Moreover, it was found that mechanical properties of PVCano-SiO2 composites reach the best when weight percent of nano-SiO2 in PVC matrix is 1%. Compared with crude PVC, the tensile strength of hyperbranched poly （amine-ester） grafted nano-SiO2/ PVC composite increases by 24.68 % and its break elongation, flexural strength and impact strength increase by 15.73%, 4.07% and 1 841.84%, respectively. Moreover, the processing of the composites is improved. 展开更多
关键词 nano-SiO2 hyperbranched poly （amine-ester） one-step polycondensation dispersion and stability
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PLA/PBS/Nano-SiO_2制备及性能研究 认领 引用 被引量：5
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作者 苏桂仙 王佳伟 +2 位作者 李佳 陈冰钰 张斌 《唐山师范学院学报》 2017年第5期9-12,共4页
采用γ-缩水甘油醚氧丙基三甲氧基硅烷(GPTS)对nano-SiO_2进行表面改性。然后采用熔融共混法,以聚丁二酸丁二酯(PBS)、GPTSano-SiO_2为改性剂,聚乙烯蜡(PEW)为润滑剂,聚乙二醇(PEG)为增塑剂,改性聚乳酸(PLA),对改性后共混物耐热性、力... 采用γ-缩水甘油醚氧丙基三甲氧基硅烷(GPTS)对nano-SiO_2进行表面改性。然后采用熔融共混法,以聚丁二酸丁二酯(PBS)、GPTSano-SiO_2为改性剂,聚乙烯蜡(PEW)为润滑剂,聚乙二醇(PEG)为增塑剂,改性聚乳酸(PLA),对改性后共混物耐热性、力学性能和流变性能的研究。结果表明,改性的nano-SiO_2加入量为1.5份时,PLA的综合力学性能最好,其拉伸强度为63.4 MPa。PBS和nano-SiO_2的加入并未使PLA复合物的热性能和加工性能降低。 展开更多
关键词 聚丁二酸丁二酯 nano-SiO2 共混 聚乳酸
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A Comparative Study on the Pozzolanic Activity between Nano-SiO_2 and Silica Fume 认领 引用 被引量：12
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作者 叶青 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2006年第3期153-157,共5页
The pozzolanic activity of nano-SiO2 and silica fume was comparatirely stndied by X-ray diffraction （ XRD ） , differential scanning calorimetry （DSC）, scanning electron micrascopy （SEM） and the compressive , bon... The pozzolanic activity of nano-SiO2 and silica fume was comparatirely stndied by X-ray diffraction （ XRD ） , differential scanning calorimetry （DSC）, scanning electron micrascopy （SEM） and the compressive , bond and bending streugths of hardened paste and concrete were also measured. Results indicate that the compressive strength development of the paste made from Ca（OH）2 and nano-SiO2, the reaction rate of Ca（ OH）2 with nano- SiO2 and the velocity of C-S-H gel formation from Ca （ OH）2 with nano-SiO2 showed marked increases over those of Ca（ OH）2 with silica fume. Furthermore, the bond strength at the interface between aggregate and hardened cement paste, and the bending strength of concrete incorporated with 3% .NS increased more than those with SF, especially at early ages. To sum up, the pozzolanic activity of nano-SiO2 was much greater than that of silica fume. The results suggest that with a small amount of nano-SiO2, the Ca（ OH）2 crystal at the interface between hardened cement paste and aggregate at early ages may be effectively absorbed in high performance concrete. 展开更多
关键词 Ca（OH）2 interaction nano-SiO2 pozzolanic activity silica fume
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Effect of NH_4F and Nano-SiO_2 on Morphological Control of α-Al_2O_3 Platelets via Solid-state Reaction 认领 引用 被引量：8
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作者 Miao Zhuang Shi Jiangong +1 位作者 Zhang Wenping Zhang Minhong 《China Petroleum Processing & Petrochemical Technology》 CAS 2016年第4期19-24,共6页
Alpha-alumina(α-Al_2O_3) platelets were prepared via solid-state reaction using pseudo-boehmite as the starting material, while NH_4F and nano-SiO_2 were used as additives, and nitric acid was used as the binder. The... Alpha-alumina(α-Al_2O_3) platelets were prepared via solid-state reaction using pseudo-boehmite as the starting material, while NH_4F and nano-SiO_2 were used as additives, and nitric acid was used as the binder. The effect of these additives on properties of the alumina platelets was determined via scanning electron microscopy, X-ray diffraction, and measurements of the surface area and silicon content. A mechanism governing their role in the synthesis process was proposed. The results indicated that NH_4F could promote the formation of highly crystalline platelets. Addition of nano-SiO_2 could lead to increase in the diameter and reduction in the thickness of the platelets, and could also prevent their transformation to α-Al_2O_3. This addition weakened the effect of NH_4F because of the reaction of nano-SiO_2 with F-species and the formation of volatile SiF_4. 展开更多
关键词 α-Al2O3 nano-SiO2 NH4F solid-state reaction
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Synthesis of Modified Epoxy Resin Undercoat for Resistor by Nano-SiO_2 认领 引用 被引量：1
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作者 王秀宇 张之圣 +1 位作者 李海燕 胡明 《Transactions of Tianjin University》 EI CAS 2006年第3期193-198,共6页
A kind of undercoat for resistor with high temperature and humidity resistance was obtained by modifying epoxy resin with proper nano-SiO2 added at 80℃. The structure, thermal stability, humidity resistance, and morp... A kind of undercoat for resistor with high temperature and humidity resistance was obtained by modifying epoxy resin with proper nano-SiO2 added at 80℃. The structure, thermal stability, humidity resistance, and morphological characteristics of the modified epoxy resin undercoat were studied by electrical tests, infrared spectra （IR） analysis, and scanning electron microscopy （SEM）. The results show that more compact and steady inter-crosslinked network structures are formed in the modified epoxy resin undercoat added with nano-SiO2, which greatly improves the performance of modified epoxy resin undercoat. The undercoat with nano-SiO2 of about 2. 71%, kept for six months at room temperature without flocculating and aggregating, is of good stability, and the surface of painted resistor is uniform, tight and without air holes on it. The varying ratio of resistance with such undercoat painted is less than one in a thousand after high temperature and humidity resistance tests. 展开更多
关键词 epoxy resin nano-SiO2 undercoat high temperature and humidity resistance
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