Reversible flocculation of silica colloids in liquid mixtures

Narayanan, T. ; Anil Kumar, ; Gopal, E. S. R. ; Beysens, D. ; Guenoun, P. ; Zalczer, G. (1993) Reversible flocculation of silica colloids in liquid mixtures Physical Review E, 48 (3). pp. 1989-1994. ISSN 1063-651X

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We report some observations concerning the reversible flocculation of silica colloids in reentrant liquid mixtures of 3-methylpyridine plus water plus heavy water and 2,6-lutidine plus water. Our research involved a detailed determination of the line of flocculation temperatures for phase-separating as well as non-phase-separating mixtures. We find that the flocculation temperature is more influenced by the impurities in the suspension rather than the concentration and size of the spheres. For a fixed volume fraction and diameter of the colloids, we notice a close similarity between the dome of flocculation temperatures and the bulk-coexistence surface but with different amplitudes and exponents in each case.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:27935
Deposited On:13 Dec 2010 08:31
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