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Facile synthesis of ternary flexible silica aerogels with coarsened skeleton for oil–water separation

机译：用于油水分离粗糙骨架三元柔性二氧化硅气凝胶的体积合成

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Ternary flexible silica aerogels were synthesized using a facile sol–gel process without solvent exchange and surface modification using dimethyldiethoxysilane (DEDMS), methyltriethoxysilane (MTES) and tetraethoxysilane (TEOS) via ambient pressure drying. The skeleton morphology of the aerogels was precisely controlled by the DEDMS/TEOS molar ratio (D). The effect of the morphology of the aerogel skeleton on the mechanical properties and the adsorption capacity was investigated. As the D increased, the morphology of the aerogel skeleton gradually changed from a fragment structure to a coarsened structure, and finally to a chain-like structure. The prepared coarsened structure aerogel exhibited a low density of 0.095 g cm ~(?3) , a compressible amount reaching up to 78.2%, a Young's modulus as low as 14 kPa, a superhydrophobicity with a contact angle of 154.8° and an excellent adsorption capacity of 8.7–15.4 g g ~(?1) . Furthermore, the outstanding recycling ability and corrosion resistance made the aerogels suitable for oil–water separation in corrosive environments.
机译：使用体内溶胶 - 凝胶工艺合成三元柔性二氧化硅气凝胶，通过环境压力干燥使用溶剂交换和表面改性，甲基三乙氧基硅烷（MTE）和四乙氧基硅烷（TEOS）。通过DEDMS / TEOS摩尔比（D）精确控制了气凝胶的骨架形态。研究了气凝胶骨架形态对机械性能和吸附能力的影响。随着D增加，气凝胶骨架的形态从片段结构逐渐改变为粗糙的结构，最后是链状结构。制备的较粗糙的结构气凝胶表现出0.095g cm〜（α3）的低密度，可压缩量达到高达78.2％，杨氏模量低至14kPa，具有154.8°的接触角的超疏水性和优异的吸附性容量为8.7-15.4 gg〜（？1）。此外，出色的回收能力和耐腐蚀性使得适用于腐蚀性环境中的油水分离的气凝胶。

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