| 水体系下两步法SiO2纳米多孔材料的制备与表征 |
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| 引用本文： | 丁文慧,沈军.水体系下两步法SiO2纳米多孔材料的制备与表征[J].稀有金属材料与工程,2018,47(S2):79-83. |
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| 作者姓名： | 丁文慧 沈军 |
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| 作者单位： | 同济大学 波尔固体物理研究所,同济大学 波尔固体物理研究所 |
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| 基金项目： | 国家科技支撑项目(2013BAJ01B01)；上海市科委纳米专项(12nm0503001)；科技部863项目(2013AA031801) |
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| 摘 要： | 以去离子水为溶剂,低成本工业硅溶胶为硅源,在纯水体系下制备低成本的SiO2纳米多孔材料,使用酸碱两步法催化,添加表面活性剂来降低溶剂的表面张力,从而减少样品在干燥过程中的开裂。最后经过常压老化干燥制备得到 SiO2纳米多孔材料。制备得到的SiO2块体密度为150~400mg/cm3,室内热导率约为0.04~0.07W/(m.K)。这种方法制备的SiO2纳米多孔材料大幅缩减制备成本,采用HCl作为酸性催化剂提高了工业生产安全,将很大程度上推动纳米多孔材料的工业化生产和应用。
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| 关 键 词： | 硅溶胶 常压干燥 表面活性剂 酸碱两步法 |
| 收稿时间： | 2017/12/5 0:00:00 |
| 修稿时间： | 2018/1/31 0:00:00 |
Preparation and characterization of SiO2 nano porous materials by two-steps approach in water system |
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| DING Wen-Hui and SHEN Jun.Preparation and characterization of SiO2 nano porous materials by two-steps approach in water system[J].Rare Metal Materials and Engineering,2018,47(S2):79-83. |
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| Authors: | DING Wen-Hui and SHEN Jun |
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| Affiliation: | Pohl Institute of Solid State Physics,Tongji University,Pohl Institute of Solid State Physics,Tongji University |
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| Abstract: | Nano porous material SiO2 were prepared by acid-alkali two steps approach with low cost industrial silica sol as silicon source and deionized water as solvent. The surfactant was used as the surface modifier to get rid of the broken of samples in the drying process. The densities, specific surface area and the average pore size of the obtained SiO2 monoliths are in the range of 150~400 mg/cm3 and the range of 0.04~0.07W/(m.K), respectively. This method greatly reduced the cost in the preparation of SiO2 nano porous material, which will largely promote the industrial production and application of porous SiO2 materials. |
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| Keywords: | Silica sol ambient drying surfactant acid-alkali two steps approach |
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