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Morphology and Mechanical Properties of PS/Al_2O_3 Nanocomposites Based on Selective Laser Sintering 认领 引用 被引量：8
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作者 Zhifeng XU Jian ZHANG +2 位作者 Haizhong ZHENG Changchun CAI Yinhui HUANG 《Journal of Materials Science & Technology》 SCIE EI CAS 2005年第6期866-870,共5页
Selective laser sintering （SLS） is a new process to prepare the polystyrene （PS）/Al2O3 nanocomposites. In this paper, with different laser power and other processing parameters unchanged, the morphology, density a... Selective laser sintering （SLS） is a new process to prepare the polystyrene （PS）/Al2O3 nanocomposites. In this paper, with different laser power and other processing parameters unchanged, the morphology, density and mechanical properties of the sintered specimens were investigated. It was found that nano-sized inorganic particles are uniformly located in the PS matrix and the maximum density of the sintered specimens with pure PS powder reaches 1.07 g/cm^3, higher than 1.04 g/cm^3 that of the sintered specimens with mixture powder. Due to strengthening and toughness of the nano-sized Al2O3 inorganic particles, the maximum notched impact strength and tensile strength of the sintered part mixed with nano-sized inorganic particles are improved greatly from 7.5 to 12.1 kJ/m^2 and from 6.5 to 31.2 MPa, respectively, under the same sintering condition. 展开更多
关键词 Selective laser sintering （SLS） Nanocomposites Polystyrene （PS） Nano-Al2O3,Laser power Mechanical properties Morphology
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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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Concentration and annealing effect on PL properties of sol-gel derived SiO_2-Y_2O_3:Eu3+ nanocomposites 认领 引用 被引量：2
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作者 王忆 曾庆光 +3 位作者 胡社军 吴坤彬 蒋俊宏 陈根廷 《Journal of Rare Earths》 SCIE EI CAS 2010年第2期176-180,共5页
An improved sol-gel method was employed to prepare Eu3+ ions doped SiO2-Y2O3 nanocomposites.Systematic study was carried out on the effect of post-annealing treatment on photoluminescence(PL) properties of the samples... An improved sol-gel method was employed to prepare Eu3+ ions doped SiO2-Y2O3 nanocomposites.Systematic study was carried out on the effect of post-annealing treatment on photoluminescence(PL) properties of the samples under various europium ions doping concentrations.X-ray diffraction(XRD) patterns indicated that the samples showed an amorphous matrix structure,and the scanning electron microscopy(SEM) pictures showed that the samples presented a nano size(from 21 to 42 nm) granular-stack structure after hi... 展开更多
关键词 Eu3+doped SiO2-Y2O3 glass photoluminescence（PL） nanocomposites rare earths
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Nafion/SiO_2 Nanocomposites:High Potential Catalysts for Alkylation of Benzene with Linear C_9-C13 Alkenes 认领 引用 被引量：4
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作者 HaiWANG MingHanHAN 《Chinese Chemical Letters》 SCIE CAS 2002年第11期1121-1124,共4页
High surface area Nafion/SiO2 nanocomposites with nano-sized Nafion resin particles entrapped and dispersed within the highly porous silica matrix exhibited significantly enhanced activity, high selectivity and long-t... High surface area Nafion/SiO2 nanocomposites with nano-sized Nafion resin particles entrapped and dispersed within the highly porous silica matrix exhibited significantly enhanced activity, high selectivity and long-term stability for the alkylation of benzene with linear C9-C13 alkenes owing to the increased accessibility of Nafion resin-based acid sites to reactants. 展开更多
关键词 Nafion/SiO2 nanocomposites Friedel-Crafts alkylation linear alkylbenzenes.
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Preparation and upconversion luminescence properties of LaF_3:Yb^(3 +),Er^(3 +) /SiO_2 nanocomposites with core /shell structure 认领 引用
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作者 曲玉秋 李美成 赵连城 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2012年第3期73-76,共4页
LaF^3＋ Yb^3＋ , Er^3＋ nanoparticles were successfully synthesized using solvothermal treatment, and LaF^3＋ Yb^3＋ , Er^3＋/SiO2 core/shell nanoparticles were also prepared with reverse microemulsion technique. The ... LaF^3＋ Yb^3＋ , Er^3＋ nanoparticles were successfully synthesized using solvothermal treatment, and LaF^3＋ Yb^3＋ , Er^3＋/SiO2 core/shell nanoparticles were also prepared with reverse microemulsion technique. The crystal structure, morphology and photoluminescence properties of as-prepared core/shell nanoparticles were in- vestigated by X-ray diffraction, transmission electron microscopy and fluorescence spectrophotometer. The re- sults showed thatLaF^3＋ Yb^3＋ , Er^3＋ nanoparticles are of hexagonal structure and SiO2 shell is amorphous. The size ofLaF^3＋ Yb^3＋ , Er^3＋. nanoparticles is 13 nm and the LaF^3＋ Yb^3＋ , Er^3＋/SiO2 nanoparticles present clearly a core/shell structure with 12 nm shell thickness. The solubility of LaF^3＋ Yb^3＋ , Er^3＋ nanocrystals in water and the biocompatibility are both improved by the SiO2 shell. The upconversion luminescence spectra suggested that the SiO~ shell has small effect on the upconversion luminescence properties of the LaF^3＋ Yb^3＋ , Er^3＋ nanocrys- tals. The core/shell structure LaF^3＋ Yb^3＋ , Er^3＋ /SiO2. nanopartlcles are expected to be used in biological appli- cations. 展开更多
关键词 LaFz ： Yb3 ＋ , Er3 ＋/SiO2 nanocomposites core/shell structure upconversion luminescence
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新型核-壳结构PS/CeO_2和PS/SiO_2复合磨料的制备及其抛光性能 认领 引用 被引量：3
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作者 陈杨 隆仁伟 +1 位作者 陈志刚 陈爱莲 《中国有色金属学报》 EI CAS 北大核心 2010年第8期1612-1617,共6页
以聚苯乙烯(PS)微球为内核,采用液相法制备具有核壳结构的PS/CeO2和PS/SiO2复合颗粒。利用X射线衍射仪、透射电子显微镜、场发射扫描电子显微镜、傅里叶转换红外光谱仪和热重分析仪等对所制备样品的物相结构、形貌和粒径等进行表征。将... 以聚苯乙烯(PS)微球为内核,采用液相法制备具有核壳结构的PS/CeO2和PS/SiO2复合颗粒。利用X射线衍射仪、透射电子显微镜、场发射扫描电子显微镜、傅里叶转换红外光谱仪和热重分析仪等对所制备样品的物相结构、形貌和粒径等进行表征。将所制备的复合磨料用于硅晶片表面二氧化硅介质层的化学机械抛光,采用原子力显微镜观察抛光表面的微观形貌,并测量表面粗糙度。结果表明:所制备的PS/CeO2和PS/SiO2复合颗粒呈近球形,粒径为250～300nm,且具有核壳包覆结构,包覆层的厚度为10～20nm;硅晶片表面二氧化硅介质层经PS/CeO2和PS/SiO2复合颗粒抛光后,表面无划痕,且非常平整,在5μm×5μm范围内,粗糙度均方根值(RMS)分别为0.238nm和0.254nm。 展开更多
关键词 PS/CeO2复合磨料 PS/SiO2复合磨料 核-壳结构 包覆 化学机械抛光
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SiO_2纳米粒子对PMMA/PS共混物共连续相结构退火粗化过程的影响 认领 引用 被引量：3
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作者 孔米秋 黄亚江 +1 位作者 刘文娟 李光宪 《高分子学报》 SCIE CAS 北大核心 2010年第9期1070-1076,共7页
考察了亲水性纳米SiO2粒子的加入对聚甲基丙烯酸甲酯/聚苯乙烯(PMMA/PS)共混体系的共连续相结构在静态高温退火时形态稳定性的影响,发现静态高温退火条件下,填充体系共连续组成范围变窄幅度较小、特征结构尺寸的粗化速率减慢.流变测试... 考察了亲水性纳米SiO2粒子的加入对聚甲基丙烯酸甲酯/聚苯乙烯(PMMA/PS)共混体系的共连续相结构在静态高温退火时形态稳定性的影响,发现静态高温退火条件下,填充体系共连续组成范围变窄幅度较小、特征结构尺寸的粗化速率减慢.流变测试表明纳米SiO2粒子加入之后PMMA/PS共混体系的黏弹性显著提高,从而能减缓破坏构成共连续相结构的纤维断裂或回缩等松弛过程的速率,有效地抑制PMMA/PS共混体系的共连续相结构粗化进程,提高相结构的稳定性.根据现有的两种粗化理论的定性分析表明,在高填充量的共混体系中,加入纳米SiO2粒子导致共混体系的黏弹性的显著改变是影响PMMA/PS共混体系在静态高温退火时共连续相结构粗化速率的主要因素,相对而言界面张力的变化对共连续相结构在静态高温退火时的粗化速率影响则应该较小. 展开更多
关键词 PMMA/PS共混物 SiO2纳米粒子 共连续结构 稳定性
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单分散SiO_2/PS复合粒子的制备 认领 引用 被引量：13
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作者 吴天斌 柯杨船 +1 位作者 王月红 董鹏 《高分子学报》 SCIE CAS 北大核心 2005年第2期289-292,共4页
Monodisperse silicon dioxide particles have been prepared by the seed growth method,and different coupling agents were used for modifying these silica particles.The results show that the size deviation of silica parti... Monodisperse silicon dioxide particles have been prepared by the seed growth method,and different coupling agents were used for modifying these silica particles.The results show that the size deviation of silica particles modified with[3 (methacryloyloxy)propyl] trimethoxysilane(KH 570) is much lower than that of silica particles modified with vinyl triethyloxy silane as the coupling agent.In the presence of ethanol and water,styrene may react with silica modified by KH 570 in dispersion polymerization.It was discovered through transmission electron microscopy and energy spectrum that the modified silica particles were successfully encapsulated with polystyrene.The number of silica particles encapsulated with polystyrene was continually decreased with the increase of the size of silica particles.Moreover,the number of silica particles was nearly unity in each SiO 2/PS composite particle when the silica particle size was greater than 410?nm. 展开更多
关键词 复合粒子 SiO2 制备 单分散 PS 核一壳结构 有机/无机 模型催化剂 粒子研究 表面性质 应用体系 光学器件 石油工业 无机物 聚合物 功能化 有机相 相匹配 包覆
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交联度对泪珠状SiO_2/PS复合粒子结构和形貌的影响 认领 引用
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作者 吴利红 周艺峰 +1 位作者 聂王焰 陈鹏鹏 《应用化工》 CAS CSCD 北大核心 2015年第7期1253-1256,1260,共4页
用硅烷偶联剂KH570对泪珠状SiO2纳米粒子的表面进行改性,并作为苯乙烯聚合反应中的种子,利用分散聚合法合成具有核壳结构的泪珠状SiO2/PS复合粒子。采用红外光谱研究了泪珠状SiO2纳米粒子与KH570、聚苯乙烯之间的相互作用;采用透射电子... 用硅烷偶联剂KH570对泪珠状SiO2纳米粒子的表面进行改性,并作为苯乙烯聚合反应中的种子,利用分散聚合法合成具有核壳结构的泪珠状SiO2/PS复合粒子。采用红外光谱研究了泪珠状SiO2纳米粒子与KH570、聚苯乙烯之间的相互作用;采用透射电子显微镜和扫描电子显微镜观察复合粒子的结构和形貌。结果表明,随着交联度的不同,SiO2/PS复合粒子具有不同的构型。润湿性测试结果表明,球形SiO2/PS复合粒子具有疏水性而泪珠状SiO2/PS复合粒子具有亲水性。 展开更多
关键词 泪珠状 SiO2/PS 分散聚合法 交联度
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SiO2纳米球掺入量对PS/SiO2纳米复合材料硬度及杨氏模量影响的研究 认领 引用
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作者 王玉玉 王晓云 +3 位作者 张文 张强 张丽 卫来 《伊犁师范学院学报（自然科学版）》 2019年第1期16-21,共6页
采用纳米压痕仪的“单点循环压痕”模式对掺入不同质量SiO2纳米球与PS的复合材料进行了硬度及杨氏模量的检测并进行分析,得到PS/SiO2纳米复合材料的硬度和杨氏模量随着纳米球掺入量的不同而变化的规律.结果表明:掺入少量(质量分数为17wt... 采用纳米压痕仪的“单点循环压痕”模式对掺入不同质量SiO2纳米球与PS的复合材料进行了硬度及杨氏模量的检测并进行分析,得到PS/SiO2纳米复合材料的硬度和杨氏模量随着纳米球掺入量的不同而变化的规律.结果表明:掺入少量(质量分数为17wt%)SiO2纳米球时,由于PS单体中表面活性层增加导致PS/SiO2纳米复合材料的硬度和杨氏模量整体小于PS单体.掺入大量(质量分数为23wt%和29wt%)SiO2纳米球时,由于SiO2掺入量的增加使SiO2的硬度和杨氏模量占据主导作用,导致PS/SiO2纳米复合材料的硬度和杨氏模量整体大于PS单体. 展开更多
关键词 PS/SiO2纳米复合材料 SiO2纳米球 硬度 杨氏模量
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基于Janus SiO_2/PS纳米颗粒的乳液相行为及流变性 认领 引用 被引量：5
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作者 陈希 马德胜 +4 位作者 田茂章 宋新民 吴朝东 韩璐 梁福鑫 《新疆石油地质》 CAS CSCD 北大核心 2018年第3期326-332,371,共7页
从微观状态和流变性能方面对克拉玛依油田81#联合站原油与Janus SiO_2/PS纳米颗粒水分散体系在不同质量分数(C_S)及不同水油体积比(R_WO)条件下形成乳液的相行为进行了研究。固定C_S=0.100%,当R_WO≤7/3时,Janus SiO_2/PS纳米颗粒水分... 从微观状态和流变性能方面对克拉玛依油田81#联合站原油与Janus SiO_2/PS纳米颗粒水分散体系在不同质量分数(C_S)及不同水油体积比(R_WO)条件下形成乳液的相行为进行了研究。固定C_S=0.100%,当R_WO≤7/3时,Janus SiO_2/PS纳米颗粒水分散体系与原油形成稳定的油包水乳液,乳液液滴粒径和黏度都随水油体积比升高而增大;当R_WO>7/3时,油水混合液分为上、下两相,上部为油包水乳液,下部以水为主,乳液黏度随水油体积比升高而降低。固定R_WO=7/3,当0.080%≤C_S≤0.300%时,油水完全混相,乳液黏度超过原油黏度的60倍,并且在高剪切速率时剪切变稀;当C_S0.300%时,油水混合液分为两相,并且黏度随分水体积增加而降低。固定R_WO=4/6,当0.001%≤C_S≤0.500%时,油水完全混相,乳液黏度为55~75 m Pa·s,并在剪切速率为3.00~70.00 s-1时剪切增稠。以上结果表明,Janus SiO_2/PS纳米颗粒水分散体系使原油在较高含水条件下形成稳定高黏的油包水乳液,并且在一定水油体积比范围内含水越高乳液黏度越高。这个研究结果为非均质油藏扩大波及体积提供了新思路。 展开更多
关键词 Janus SiO2/PS纳米颗粒 水油体积比 乳化剂 油包水乳液 流变性能 乳化扩大波及体积
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单分散PS/SiO_2纳米复合微球的制备与表征 认领 引用 被引量：1
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作者 邹华 吴石山 沈健 《高分子学报》 SCIE CAS 北大核心 2009年第3期268-272,共5页
采用一种简单和低成本的方法制备单分散SiO2包覆聚苯乙烯(PS)(PS/SiO2)核-壳型纳米复合微球.首先在聚乙烯吡咯烷酮(PVP)存在下制备了PS纳米微球,然后在NH4OH/乙醇溶液中通过溶胶-凝胶过程在PS微球表面包覆SiO2.PS纳米微球的制备在水介... 采用一种简单和低成本的方法制备单分散SiO2包覆聚苯乙烯(PS)(PS/SiO2)核-壳型纳米复合微球.首先在聚乙烯吡咯烷酮(PVP)存在下制备了PS纳米微球,然后在NH4OH/乙醇溶液中通过溶胶-凝胶过程在PS微球表面包覆SiO2.PS纳米微球的制备在水介质中进行,无需使用共单体,使用的是常用的过硫酸钾自由基引发剂;包覆处理前不用进行溶剂交换或离心处理.研究了PVP,NH4OH和原硅酸乙酯(TEOS)的用量对PS/SiO2纳米复合微球尺寸和形态的影响.随着PVP用量增加,PS微球变小,因此得到较小的PS/SiO2纳米复合微球;NH4OH用量对SiO2包覆层的厚度没有影响,但对SiO2包覆层的表面形态有影响,随着NH4OH用量增加包覆层表面变得粗糙;随着TEOS溶液用量增加,生成的SiO2增加,其包覆层的厚度增加. 展开更多
关键词 PS/SiO2纳米复合微球 聚乙烯吡咯烷酮 核-壳微球
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表面化学沉积法制备SiO_2空心微球 认领 引用 被引量：4
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作者 阴育新 侯峰 +3 位作者 谭欣 赵林 邹冀 钱力鹏 《功能材料》 EI CAS 北大核心 2009年第7期1124-1126,1129,共3页
研究了以聚苯乙烯(PS)微球为模板,采用表面化学沉积技术制备SiO2@PS微球的工艺。利用ξ电位及FT-IR吸收光谱分析了硅烷偶联剂(MPS)及引发剂(KPS)对PS微球表面电荷及表面官能团的影响,在PS微球表面官能化过程中加入KPS,促进PS微球与MPS聚... 研究了以聚苯乙烯(PS)微球为模板,采用表面化学沉积技术制备SiO2@PS微球的工艺。利用ξ电位及FT-IR吸收光谱分析了硅烷偶联剂(MPS)及引发剂(KPS)对PS微球表面电荷及表面官能团的影响,在PS微球表面官能化过程中加入KPS,促进PS微球与MPS聚合,增加了微球表面Si-OH的浓度,实现TEOS在PS微球表面的均匀包裹,制得了单分散的核壳结构的SiO2@PS微球。通过调整TEOS的加入量,可得到壁厚在20～55nm的SiO2空心球。 展开更多
关键词 PS模板 SiO2@PS微球 MPS KPS
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纳米SiO_2存在下苯乙烯原位乳液聚合 认领 引用 被引量：5
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作者 申屠宝卿 高其标 +1 位作者 黄志明 翁志学 《浙江大学学报（工学版）》 EI CAS 北大核心 2004年第4期513-517,共5页
在纳米二氧化硅(SiO2)存在下,进行苯乙烯(St)原位乳液聚合,制备复合纳米级PS/SiO2微胶囊.着重研究了单体浓度、St/SiO2比、固含量、单体和引发剂的加料方式、聚合温度等因素对苯乙烯转化率和PS/SiO2微胶囊粒径的影响.结果表明,在原位乳... 在纳米二氧化硅(SiO2)存在下,进行苯乙烯(St)原位乳液聚合,制备复合纳米级PS/SiO2微胶囊.着重研究了单体浓度、St/SiO2比、固含量、单体和引发剂的加料方式、聚合温度等因素对苯乙烯转化率和PS/SiO2微胶囊粒径的影响.结果表明,在原位乳液聚合过程中,苯乙烯可插入纳米二氧化硅团聚体的缝隙,随着聚合反应的进行使之崩裂和剥离,并使团聚的纳米二氧化硅重新分散到纳米尺度.St/SiO2比是影响复合微胶囊粒径的主要因素;随着聚合反应的进行,剥离程度加深,复合微胶囊的粒径逐渐减小. 展开更多
关键词 纳米二氧化硅 苯乙烯 原位乳液聚合 微胶囊 粒径 PS/SiO2 聚合物/无机纳米复合材料
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聚N-异丙基丙烯酰胺/SiO_2纳米复合水凝胶的制备及性能 认领 引用 被引量：2
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作者 周莉莉 刘艳霞 +1 位作者 刘乐 冯献起 《河北大学学报（自然科学版）》 CAS 北大核心 2018年第5期496-502,共7页
用一种简便、通用的方法,以N-异丙基丙烯酰胺为单体,以修饰二氧化硅为交联剂和增强剂,制备出一种具有较高机械强度和良好温度响应性能的聚N-异丙基丙烯酰胺/SiO_2PNIPAm/m-SiO_2纳米复合水凝胶.采用TEM、SEM、傅里叶变换红外光谱、万能... 用一种简便、通用的方法,以N-异丙基丙烯酰胺为单体,以修饰二氧化硅为交联剂和增强剂,制备出一种具有较高机械强度和良好温度响应性能的聚N-异丙基丙烯酰胺/SiO_2PNIPAm/m-SiO_2纳米复合水凝胶.采用TEM、SEM、傅里叶变换红外光谱、万能实验机和差示扫描量热法,对水凝胶的结构、机械性能和热力学性能,进行了分析、测试和表征.研究结果表明:该复合水凝胶具有孔径均匀分布的三维网状结构(孔径约1μm)、高的机械强度(压缩强度可以达到8MPa)和良好的韧性,并在35℃左右具有明显的相转变行为(去溶胀性能). 展开更多
关键词 水凝胶 纳米复合材料 二氧化硅 高强度 智能材料
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Controlling Shell Thickness of PS/SiO_2 Core-Shell Particles and Their Crystallization into 3-D Ordered Thin Film 认领 引用 被引量：1
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作者 武晓峰 陈运法 +1 位作者 魏连启 王奇 《过程工程学报》 EI CAS 北大核心 2006年第Z2期285-289,共5页
PS/SiO2 particles with core-shell structure were synthesized by coating silica on surface of polystyrene(PS) colloidal particles.The reaction parameters,such as initial tetraethyl orthosilicate(TEOS) concentration,wat... PS/SiO2 particles with core-shell structure were synthesized by coating silica on surface of polystyrene(PS) colloidal particles.The reaction parameters,such as initial tetraethyl orthosilicate(TEOS) concentration,water concentration and reaction temperature,have been investigated to control the thickness of silica shells.The shell thickness was prepositional to the square root of the initial concentration of TEOS and first increased with increasing water concentration,reached a maximum at about 2.0 mol/L and then started decreasing beyond that concentration.It was also found that the shell thickness decreased firstly with the reaction temperature added,then tended to a constant.The so-synthesized PS/SiO2 core-shell particles were directly crystallized into 3-D ordered thin film,then sintered at 570℃ into the ordered macroporous thin film.Compared with the conditional method,the present approach avoids repeatedly filling the precursor in the templetes and save time more. 展开更多
关键词 PS/SiO2 core-shell particles ordered thin film
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巯基功能化多级孔SiO_2的制备及其对水中Hg2+的去除 认领 引用
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作者 张钰 姜惠烨 +2 位作者 张楠 王倩 田景芝 《高师理科学刊》 2019年第3期57-63,共7页
采用胶晶模板法,以正硅酸乙酯为硅源,以聚苯乙烯(PS)为模板剂,以三甲氧基硅烷为巯基功能化接枝剂,制备了多级孔结构的巯基功能化SH-SiO_2材料.以此为吸附剂探究了间歇式动态吸附条件下吸附剂用量、吸附时间及pH值对水中Hg2+去除效果... 采用胶晶模板法,以正硅酸乙酯为硅源,以聚苯乙烯(PS)为模板剂,以三甲氧基硅烷为巯基功能化接枝剂,制备了多级孔结构的巯基功能化SH-SiO_2材料.以此为吸附剂探究了间歇式动态吸附条件下吸附剂用量、吸附时间及pH值对水中Hg2+去除效果的影响.并采用TEM、SEM、FTIR、N_2-物理吸附、压汞及ED对材料进行结构和组份分析表征.结果表明,所制备的多级孔SH-SiO_2空间形貌呈有序的大孔(～200 nm)、介孔(3～20 nm)及微孔(<5 nm)多级孔结构.间歇式动态吸附方式表明,当吸附剂中S含量为8.52%,用量为10mg,吸附时间为70min,溶液的pH值为7.5～8时,水中Hg2+吸附率可达90%以上. 展开更多
关键词 胶晶模板法 聚苯乙烯(PS)模板剂 功能化SiO2
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Sol-Gel Preparation of Nanoscale TiO2/SiO2Composite for Eliminating of Con Red Azo Dye 认领 引用
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作者 Abdolreza Nilchi Simin Janitabar-Darzi Somayeh Rasouli-Garmarodi 《Materials Sciences and Applications》 2011年第5期476-480,共5页
A new anatase/SiO2 nanocomposite was synthesized by sol-gel method at room temperature using titanium tetrachloride and tetraethylorthosilicate as raw materials. Characterization of the product was carried out by mean... A new anatase/SiO2 nanocomposite was synthesized by sol-gel method at room temperature using titanium tetrachloride and tetraethylorthosilicate as raw materials. Characterization of the product was carried out by means of X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) specific surface areas, Thermogravimetry analysis (TGA), Fourier transform infrared (FT-IR), and UV-vis absorption spectroscopy. Thermal phase transformation studies of composite were carried out up to 1100°C which showed the establishment of anatase TiO2 phase. The presence of some tetrahedral coordination of TiO2 species in SiO2 matrix was confirmed by UV-Vis study. The produced TiO2/SiO2 nanocomposite has good photocatalytic properties due to its anatase phase, existence of tetrahedral coordination of TiO2 in the SiO2 matrix and very large surface area. Furthermore, the synthesized anatase/SiO2 shows significant adsorption ability towards Congo Red (CR) azo dye in comparison with the pure commercial TiO2 which is known as Degussa, P25. 展开更多
关键词 TiO2/SiO2 Nanocomposites Sol-Gel Preparation Photocatalyst Congo Red
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Thermal Stability and Crystallinity Study of Polystyrene/SiO2 Nano-Composites Synthesis via Microwave-Assisted In Situ Polymerization 认领 引用
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作者 Nikesh Samarth Linchon Mehta +2 位作者 Vinayak Kamble Malhari Kulkarni Prakash Mahanwar 《Open Journal of Synthesis Theory and Applications》 2016年第2期15-23,共9页
Serials of polystyrene/SiO2 Nano composites (PS/SiO2) with different content of inorganic fillers were successfully prepared by the in situ bulk radical polymerization of styrene under microwave irradiation. The effec... Serials of polystyrene/SiO2 Nano composites (PS/SiO2) with different content of inorganic fillers were successfully prepared by the in situ bulk radical polymerization of styrene under microwave irradiation. The effect of the amount of Nano SiO2 on the properties of the PS/SiO2 Nanocomposites along with the average relative molecular masses (Mn, Mz and Mw) was investigated by thermal analysis and X-Ray Diffraction (XRD). Their structural model was proposed on the basis of the Optical Microscopy, FTIR (Fourier Transform Infrared) analysis, differential scanning calorimetry (DSC), gel permeation chromatography (GPC) and X-Ray Diffraction (XRD). The dispersion of nanoparticles in Polystyrene is observed in the magnified image. The effect of microwave irradiation power on molecular weight of polystyrene was also studied. It was found that, the microwave assisted reaction needs less time as compare to conventional polymerization and found to be in between 10 to 15 min. 展开更多
关键词 Nanocomposites In Situ Polymerization Bulk Polymerization Nano SiO2
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Synthesis of silica/metatitanic acid nanocomposite and evaluation of its catalytic performance for aquathermolysis reaction of extra-heavy crude oil 认领 引用 被引量：2
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作者 Xueliang Liu Yiguang Li +3 位作者 Zhijun Zhang Xiaohong Li Mengyun Zhao Changming Su 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2015年第4期472-476,共5页
A lipophilic silica/metatitantic acid（denoted as Si O2/H2 TiO 3） nanocomposite was synthesized by hydrothermal reaction with surface-modified Si O2 as the lipophilic carrier. As-synthesized Si O2/H2 TiO 3nanocomposi... A lipophilic silica/metatitantic acid（denoted as Si O2/H2 TiO 3） nanocomposite was synthesized by hydrothermal reaction with surface-modified Si O2 as the lipophilic carrier. As-synthesized Si O2/H2 TiO 3nanocomposite was used as a catalyst to promote the aquathermolysis reaction of extra-heavy crude oil thereby facilitating the recovering from the deep reservoirs at lowered temperature. The catalytic performance of the as-synthesized Si O2/H2 TiO 3catalyst for the aquathermolysis reaction of the heavy oil at a moderate temperature of 150 °C was evaluated in relation to the structural characterizations by TEM,FTIR,XRD and FESEM as well as the determination of the specific surface area by N2adsorption–desorption method. Findings indicate that as-synthesized Si O2/H2 TiO 3nanocomposite exhibits an average size of about 20 nm as well as good lipophilicity and dispersibility in various organic solvents; and it shows good catalytic performance for the aquathermolysis reaction of the extra-heavy oil extracted from Shengli Oilfield of China. Namely,the assynthesized Si O2/H2 TiO 3catalyst is capable of significantly reducing the viscosity of the tested heavy oil from58,000 c P to 16,000 c P（referring to a viscosity reduction rate of 72.41%） at a mass fraction of 0.5%,a reaction temperature of 150 °C and a reaction time of 36 h,showing potential application in downhole upgrading heavy crude oils. 展开更多
关键词 SiO2/H2TiO3 nanocomposite Catalytic aquathermolysis Heavy oil Viscosity reduction
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