The Stability of SiO2 Sol

Abstract

Abstract:

　The SiO₂ sol is a kind of colloid solution , with SiO₂ particle dispersing in water or organic solvents , and has been widely used in the industries of the ceramics, textile , papermaking , paint, water treatment and semiconductor and so on .SiO₂ sol was prepared from tetraethoxysilane(TEOS)by sol-gel method with ethanol as solvent and hydrochloric acid as catalyst .The effects of the solvent , the pH value , and additives o n the stability of SiO₂ sol were studied during the so l-gel processing .The effects of these factors can be used to control the stability of the SiO₂ sol .The results show the more the amount of EtOH , the mo re the stability of sol.In the absence o f additives , the stability of sol increases as the pH value is increased.As the pH value is increased , the stability of sol firstly increases, but then decreases when additives are added to the SiO₂ sol.Gelation time becomes long when DMF additive is added to the SiO₂ sol .If the mole ratio of TEABr and TEOS is mo re than 0 .05, TEABr makes g elation time become longer .

Key words: 　SiO2 sol , Stability , pH value , Additives

摘要： 　二氧化硅溶胶是二氧化硅微粒分散于水中或有机溶剂中的胶体溶液, 在陶瓷、纺织、造纸、涂料、水处理、半导体等行业中有着广泛的应用。以正硅酸乙酯(TEOS)为原料, 乙醇为溶剂, 盐酸为催化剂, 用溶胶-凝胶工艺制备二氧化硅溶胶, 初步研究了溶剂、pH 值以及添加剂对二氧化硅溶胶稳定性的影响, 从而可以利用这些因素来实现对二氧化硅溶胶稳定性的控制。结果表明, 随着乙醇含量的增加, 溶胶的稳定性增加;无添加剂时, 随着pH 值的升高, 溶胶的稳定性也随之增加;在添加剂存在下, 随着pH 值增加, 溶胶的稳定性先增加后降低;加入添加剂DMF, 能使溶胶的凝胶时间延长;n (TEABr)/ n (TEOS)大于0 .05 时, TEABr 能使溶胶的凝胶时间延长。

关键词: 二氧化硅溶胶, 　稳定性, 　pH 值, 　添加剂

QIU Chun-yang,ZHANG Ke-zheng. The Stability of SiO₂ Sol[J]. Journal of Liaoning Petrochemical University, 2005, 25(2): 1-4.

邱春阳, 张克铮. 二氧化硅溶胶稳定性的研究[J]. 辽宁石油化工大学学报, 2005, 25(2): 1-4.

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The Stability of SiO₂ Sol

二氧化硅溶胶稳定性的研究

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