Abstract
The stability of SiO2 sol is an important parameter in the practical applications. But so far the parameter for expressing the stability of SiO2 sol cannot be characterized by a proper measurement. In this paper, a new method, liquid permeating method, was introduced, by which the stability of SiO2 sol was characterized and the effects of additive, such as dimethylformamide (DMF) and MgO were presented. The results show that with the amount of DMF increasing, the gel-time of SiO2 sol became longer; and that with the amount of MgO increasing, the gel-time became shorter. The results obtained by this new method are as same as that from the traditional tedious viscometer measurement method, which indicate that this liquid permeating method is a reliable method for characterizing the stability of SiO2 sol. Besides, this liquid permeating method is also simple, time-saving and low-cost for evaluating SiO2 sol stability.
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