Volume 70, Number 5, June 2005
|Page(s)||684 - 689|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||29 April 2005|
Probing glass transition of clay colloids by NMR relaxometry: Interplay between fluid Brownian dynamics and particle jamming
Laboratoire de Physique de la Matière Condensée, UMR 7643 du CNRS Ecole Polytechnique - 91128 Palaiseau, France
Corresponding author: email@example.com
Accepted: 12 April 2005
Using field cycling NMR relaxometry, we show how the slow water dynamics in the proximity of a colloidal surface provides an original way to follow the glass transition and the strong rotational slowing-down of a colloidal system made of plate-like laponite particles, a synthetic clay. The interplay between fluid Brownian loops near colloidal interfaces (which follows a Lévy statistics) and particle dynamics is discussed. We propose an analytical model of the NMR relaxometry involving elementary time steps of the fluid dynamics near a colloidal interface (e.g., bulk loops, adsorption trains, escaping tails) coupled to the rotational dynamics of the particle. This close-form model is supported by our experimental data.
PACS: 82.70.Dd – Colloids / 76.60.Es – Relaxation effects / 64.70.Pf – Glass transitions
© EDP Sciences, 2005
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