超疏水、超亲油MTES-DMDES型柔性气凝胶的制备及表征

Synthesis and Characterization of Superhydrophobic,Superoleophlic,Flexible MTES-DMDES Based Aerogels

以甲基三乙氧基硅烷(MTES)和二甲基二乙氧基硅烷(DMDES)为前驱体,水为反应物,乙醇为溶剂,盐酸和氨水为催化剂,十六烷基三甲基溴化铵(CTAB)为表面活性剂,通过溶胶-凝胶法和超临界干燥制备得到疏水亲油MTES-DMDES型柔性气凝胶块体。通过红外光谱、X射线衍射、扫描电镜、X射线能量色谱、应力-应变,疏水性测试、热重等测试分析发现,气凝胶具有三维网络骨架结构,密度低至0.0897 g/cm^3,最大应变达到80%,应力低至36.85 k Pa,疏水接触角为153.6°,热稳定温度高达400℃。能从水中快速高效去除油污,是具有广阔应用前景的油/水分离材料。

Superhydrophobic and superoleophlic methyltriethoxysilane （MTES） -dimethyldiethoxysilane （DMDES） based aerogels were synthesized through sol-gel reaction followed by supercritical drying, in which MTES and DMDES were used as co-precursors, EtOH as solvents, cetyl trimethyl ammonium bromide（CTAB） as surfactant, HCl and NH3·H2O as catalysts. The as-prepared aerogels were characterized by FT-IR, XRD, SEM, EDS, elastic recovery test, hydrophobic test and thermogravimetry. The results indicate that the as-prepared aerogels have high three-dimensional network structure, the low density of 0.0897 g/cm3 with the high compression ratio of 80 % and stress of 36.85 kPa. They have superhydrophobicity with the water contact angle of 153.6° and can stabilize up to 400 ℃. It is also find that they have high selectivity for removing oil from water, thereby can be used as a potential oil/water separation material.