Abstract
IT has been found that silica and certain silicates undergo a slow change of surface properties when kept in water, their suspensions becoming resistant to flocculation by polyacrylamide. For example, fresh 1 per cent suspensions of the high-purity, amorphous silica ‘Aerosil’ (Dogussa, Germany) are rapidly flocculated by a 0.004 per cent solution of polyacrylamido of high molecular weight, such as ‘Cyanamer P 250’ (American Cyanamid Co., New York); but, after standing for a certain time, ‘Aerosil’ suspensions can no longer be flocculated, even by larger amounts of polyacrylamide (for example, 0.08 per cent). Fig. 1 shows the times required to develop resistance to flocculation in various solutions.
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References
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GRIOT, O., KITCHENER, J. ‘Ageing’ of Silica Suspensions in Water and its Influence on Flocculation by Polyacrylamide. Nature 200, 1004–1005 (1963). https://doi.org/10.1038/2001004b0
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DOI: https://doi.org/10.1038/2001004b0
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