Journal
EUROPHYSICS LETTERS
Volume 60, Issue 5, Pages 802-808Publisher
E D P SCIENCES
DOI: 10.1209/epl/i2002-00380-5
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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 3.5 x 10(-4) less than or equal to phi less than or equal to 1.55 x 10(-2), 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) effecting the order of the suspension does not monotonically decrease, but rather shows a distinct minimum at phi similar to (5-8) x 10(-3). This reappearance of structure is compared with theoretical predictions on the basis of a jellium model for the effective interparticle potential U-eff(r).
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