过程工程学报
過程工程學報
과정공정학보
The Chinese Journal of Process Engineering
2005年
2期
152-156
,共5页
黄瑞安%侯立松%赵启涛%任叔华
黃瑞安%侯立鬆%趙啟濤%任叔華
황서안%후립송%조계도%임숙화
sol-gel%tin tetrabutoxide%hydrolysis%condensation
The gelling process in the preparation of tin oxide materials based on tin tetrabutoxide is studied. Sn(OBun)4 modified by two moles of acetylacetone (AcAc) has a stable six-member ring structure and is less susceptive to water. In a system with a lower molar ratio of acetylacetone to Sn(OBun)4 ([AcAc]/[Sn(OBun)4]＜2.0) or a larger portion of water ([H2O]/[Sn(OBun)4]＞2.5), colloidal suspension or white precipitation will take place. A system with molar ratios of both acetylacetone to Sn(OBun)4 and water to Sn(OBun)4 at 2.0 is transparent and olivaceous sol. As catalysts, hydrofluoric,hydrochloric, hydrobromic and acetic acids, and ammonia all accelerate the hydrolysis and condensation of Sn(OBun)4 during the sol-gel process. Light scattering measurement indicates that cluster size distribution in the sol system undergoes gradual broadening during the sol-gel transition.
