Preparation of sponge-reinforced silica aerogels from tetraethoxysilane and methyltrimethoxysilane for oil/water separation
Preparation of sponge-reinforced silica aerogels from tetraethoxysilane and methyltrimethoxysilane for oil/water separation
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DOI：
10.1088/2053-1591/aab7c3
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发表时间：
2018-04
影响因子：
2.3
通讯作者：
Ming Li;Hongyi Jiang;Dong Xu
中科院分区：
文献类型：
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作者：
Ming Li;Hongyi Jiang;Dong Xu
以正硅酸乙酯(TEOS)和甲基三甲氧基硅烷(MTMS)为原料，采用溶胶-凝胶反应和常压干燥法制备了聚氨酯海绵增强二氧化硅气凝胶。在海绵增强的二氧化硅气凝胶中，纳米孔气凝胶聚集体填充在聚氨酯海绵的孔隙中。海绵增强气凝胶具有疏水性和亲油性，对机油的吸收率极高(10.6g−1用于正硅酸乙酯气凝胶和9.2g−1用于MTMS气凝胶)。此外，海绵增强气凝胶复合材料的力学性能也有显著改善。TEOS基气凝胶和MTMS基气凝胶的抗压强度明显提高，分别达到349kPa和60kPa.特别是，基于MTMS的海绵增强二氧化硅气凝胶在加载时急剧收缩，然后在卸载时恢复到原始尺寸。从形貌、孔径分布和化学结构等方面讨论了两种前驱体对海绵增强二氧化硅气凝胶性能的影响。
Polyurethane sponge-reinforced silica aerogels based on tetraethoxysilane (TEOS) and methyltrimethoxysilane (MTMS) were fabricated by a facile method through sol-gel reaction followed by ambient pressure drying. In sponge-reinforced silica aerogels, nanoporous aerogel aggregates fill in the pores of polyurethane sponge. The sponge-reinforced aerogels are hydrophobic and oleophilic and show extremely high absorption for machine oil (10.6 g g−1 for TEOS-based aerogel and 9.2 g g−1 for MTMS-based aerogel). In addition, the sponge-reinforced aerogel composites exhibit notable improvements with regards to mechanical properties. The compressive strength was enhanced obviously up to about 349 KPa for TEOS-based aerogel and 60 KPa for MTMS-based aerogel. Specially, sponge-reinforced silica aerogels based on MTMS drastically shrank upon loading and then recovered to the original size when unloaded. The property differences of the sponge-reinforced silica aerogels caused by the two precursors were discussed in terms of morphologies, pore size distributions and chemical structure.