Volume 49, Number 5, March I 2000
|Page(s)||672 - 677|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 September 2002|
Liquid-solid transition of Laponite suspensions at very low ionic strength: Long-range electrostatic stabilisation of anisotropic colloids
Centre de Recherche sur la Matière Divisée,
CNRS 1b rue de la Ferollerie, 45071 Orleans cedex 02, France
2 C. E. Saclay, Service de Chimie Moléculaire - 91191 Gif-sur-Yvette cedex France
Corresponding author: email@example.com
Accepted: 17 December 1999
We study suspensions of synthetic clay Laponite at very low ionic strength. We show the existence, for these charged disk-like particles, of a liquid-soft solid transition mainly driven by electrostatic repulsive interactions. Such a process defines a re-entrant transition line in the phase diagram. Location of this line is predicted using basic arguments. The structure is characterized by ultra-small-angle X-ray scattering (USAXS). Soft-solid suspensions show a correlation peak compatible with long-range electrostatic stabilization. Such a result strongly contrasts with the evolution of the scattering spectra for solid-like suspensions of Laponite at high ionic strength (above ). Close inspection of this correlation peak reveals that individual particle distribution is not homogeneous in space.
PACS: 82.70.Dd – Colloids / 83.70.Hq – Heterogeneous liquids: suspensions, dispersions, emulsions, pastes, slurries, foams, block copolymers, etc / 64.70.-p – Specific phase transitions
© EDP Sciences, 2000
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