Synthesis of silica aerogel monoliths with controlled specific surface areas and pore sizes
Synthesis of silica aerogel monoliths with controlled specific surface areas and pore sizes
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DOI：
10.1088/2053-1591/aa748e
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发表时间：
2017-07
影响因子：
2.3
通讯作者：
Bingying Gao;Shaoxiang Lu;Mulenga Kalulu;O. Oderinde;Lili Ren
中科院分区：
文献类型：
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作者：
Bingying Gao;Shaoxiang Lu;Mulenga Kalulu;O. Oderinde;Lili Ren
为了取代传统的二氧化硅气凝胶的制备方法，在制备过程中引入了小分子1，2-环氧丙烷（PO）而不是使用氨作为交联剂，从而生成轻质、高孔隙率和大表面积的二氧化硅气凝胶单体。提出了一种简单的溶液法合成SiO2气凝胶的方法，并采用扫描电镜（SEM）、透射电镜（TEM）、X射线衍射（XRD）、红外光谱（FTIR）、热重分析（TGA）和BET法对SiO2气凝胶进行了表征。通过改变PO的用量，可以自由调节SiO2气凝胶的比表面积和孔径大小，这将有助于促进SiO2气凝胶的发展，以制备具有类似要求的其他多孔材料。我们还采用了一种新的有机溶剂升华干燥（OSSD）方法，以取代传统的昂贵和危险的干燥方法，如临界点干燥和冷冻干燥。该方法简单易行，重复性好，将进一步促进二氧化硅气凝胶的实际应用。
To replace traditional preparation methods of silica aerogels, a small-molecule 1,2-epoxypropane (PO) has been introduced into the preparation process instead of using ammonia as the cross-linking agent, thus generating a lightweight, high porosity, and large surface area silica aerogel monolithic. We put forward a simple solution route for the chemical synthesis of silica aerogels, which was characterized by scanning electron microscopy (SEM), TEM, XRD, FTIR, thermogravimetric analysis (TGA) and the Brunauer–Emmett–Teller (BET) method In this paper, the effect of the amount of PO on the microstructure of silica aerogels is discussed. The BET surface areas and pore sizes of the resulting silica aerogels can be freely adjusted by changing the amount of PO, which will be helpful in promoting the development of silica aerogels to fabricate other porous materials with similar requirements. We also adopted a new organic solvent sublimation drying (OSSD) method to replace traditional expensive and dangerous drying methods such as critical point drying and freeze drying. This simple approach is easy to operate and has good repeatability, which will further facilitate actual applications of silica aerogels.