Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 283, Issue 2, Pages 397-405Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2004.09.043
Keywords
Laponite; aggregation; gelation; disk-like colloid
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We propose a state diagram of charged disk-like mineral particle (Laponite) dispersions as a function of the Laponite concentration (C) and the concentration of added salt (C-s), based on simple observation and light-scattering measurements. At low C or high C-s the dispersions separate into two domains due to sedimentation of Laponite aggregates, while at high C and low C-s they form homogeneous gels that do not flow upon tube reversal. The aggregation rate and the structure factor of the Laponite dispersions is determined with light scattering as a function of C and C-s. We discuss in detail the controversy on the origin of gelation of Laponite dispersions in the absence of added salt. We argue that aggregation rather than glass formation causes gelation. (C) 2004 Elsevier Inc. All rights reserved.
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