SiO_2气凝胶的制备及微孔分布

PREPARATION OF SiO 2 AEROGEL AND PORES DISTRIBUTION

本文以正硅酸乙酯（ＴＥＯＳ）为原料，水和乙醇为溶剂，盐酸和氨水为催化剂，采用溶胶－凝胶，水热合成和低温冷冻干燥等工艺，制备了ＳｉＯ２气凝胶，研究了ｐＨ值、ＴＥＯＳ浓度及焙烧温度对气凝胶的比表面积、孔径分布的影响。结果表明：在碱性条件下，制得的气凝胶比表面积较大，孔径较窄。气凝胶在较高温度下，比表面积有所下降，孔径略微变粗。

The SiO 2 aerogel was synthesized from TEOS, EtOH and H 2O using Sol-gel, hydrothermal and low temperature drying technique depending on catalyst HCI or NH 3 The influence of the pH value of the original hydrogel, TEOS concentration and drying temperature on surface area, pore distribution of aerogel were investigated In our experimental scope when pH=9 3, the resultant SiO 2 aerogel has higher surface area, narrower and smaller pore distribution Having been dried in higher temperature, the surface area and pore distribution of areogel are lower and wider