Volume 60, Number 5, December 2002
|Page(s)||802 - 808|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 November 2002|
Reappearance of structure in colloidal suspensions
Université de Fribourg, Institut de
Physique - Pérolles, CH-1700 Fribourg, Switzerland
2 LS Instruments - Chemin du Musée 3, CH-1700 Fribourg, Switzerland
3 Universität Konstanz, Fachbereich Physik - D-78457 Konstanz, Germany
Accepted: 23 September 2002
Static structure factors S(q) of deionized aqueous suspensions of charged polystyrene particles with similar radii but strongly differing bare charges have been measured for volume fractions , using a cross-correlation light scattering technique which allows for the extraction of single scattered light from highly turbid samples. Measurement of absolute intensities allowed to determine unambiguously normalized values of S(q). With decreasing volume fraction, the amplitude of the first peak of S(q) reflecting the order of the suspension does not monotonically decrease, but rather shows a distinct minimum at . This reappearance of structure is compared with theoretical predictions on the basis of a jellium model for the effective interparticle potential .
PACS: 82.70.Dd – Colloids / 61.20.Qg – Structure of associated liquids: electrolytes, molten salts, etc
© EDP Sciences, 2002
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