| 二氧化硅气凝胶的常压制备及其特性研究 |
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| 引用本文： | 李华,乔聪震,牟占军. 二氧化硅气凝胶的常压制备及其特性研究[J]. 河南大学学报(自然科学版), 2009, 39(2) |
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| 作者姓名： | 李华 乔聪震 牟占军 |
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| 作者单位： | 内蒙古工业大学,化学化工学院,呼和浩特,010051;河南大学,化学化工学院,精细化学与工程研究所,河南,开封,475001 |
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| 基金项目： | 河南省教育厅自然科学研究项目 |
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| 摘 要： | 以正硅酸乙酯为原料,先采用溶胶-凝胶法制备湿凝胶,然后浸泡在反应溶液中进行老化,再利用正己烷进行溶剂交换,三甲基氯硅烷进行表面改性,最终获得轻质多孔二氧化硅气凝胶. 进一步考察了凝胶时间随乙醇和水的不同加入量和pH值的变化,利用FTIR、XRD和SEM等方法对二氧化硅气凝胶表征. 结果表明,所制备的疏水SiO2气凝胶的密度、比表面积和孔隙率分别为77～200 kg·m-3,500～750 m2g-1和85%～95%,其颗粒尺寸为50～200 nm.
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| 关 键 词： | 二氧化硅 气凝胶 常压干燥 |
The Synthesis and Characteristic of Silica Aerogels by Ambient Pressure Drying Process |
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| LI Hua,QIAO Cong-zhen,MU Zhan-jun. The Synthesis and Characteristic of Silica Aerogels by Ambient Pressure Drying Process[J]. Journal of Henan University(Natural Science), 2009, 39(2) |
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| Authors: | LI Hua QIAO Cong-zhen MU Zhan-jun |
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| Affiliation: | 1.College of Chemistry and Chemical Engineering;Inner Mongolia University of Technology;Huhehaote 010051;China;2. College of Chemistry and Chemical Engineering;Institute of fine chemistry and Engineering;Henan University;Henan Kaifeng 475001;China |
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| Abstract: | Using tetraethoxysilane(TEOS)as the silica source,silica aerogels were synthesized via sol-gel and ambient drying process. In order to enhance the wet gel,measures such as prolonging aging time; changing solvent and trimethylchlorosilane(TMCS)/hexane modification were adopted. The synthesized silica aerogel was a light,porous and crack-free solid. The influences of catalyst mass,H2O and ethanol on gel time were also studied. The microstructure,morphology and properties of the aerogels were characterized by ... |
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| Keywords: | silicon dioxide aerogel ambient dryness |
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