By Thomas Palberg, Matthias Ballauff
This quantity comprises the court cases of the "International Workshop on Optical equipment and the Physics of Colloidal Dispersions", held in reminiscence of Prof. Dr. Klaus Schätzel on the finish of September, 1996, in Mainz, Germany. The assembly excited about specified facets of colloidal technology, particularly novel optical equipment and the physics of colloidal dispersions. specifically, the contributed papers convey that the rise within the caliber and variety of appropriate version platforms has considerably more advantageous our wisdom of colloidal homes, buildings and dynamics.
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2). 000 g/mol; [37]) and the polymer concentration cover the surface of the particles but avoid the formation of free micelles. 3 g/1. First of all, the structure factor of the pure hard spheres well-suited for a quantitative investigation. It can be (solid line in Fig. 2a) can be well approximated by the first shown that for this system the contribution of the cross two coefficients of its expansion into powers of q2 up to term to I(q) (see Eq. 03nm -1. This region therefore may be called measured turbidity is fully determined by the contribution "Guinier region" of the structure factor.
Ap/aL. The depletion potential (Eq. (3)) can be introduced into S(q) as a perturbation using the random-phase approximation (RPA) [39]. The RPA consists of equating the direct correlation function c(r) of the latex spheres to c(r) = co(r) Udep(r) kT (7) Here co(r) is the direct correlation function of the hardsphere reference fluid which can be obtained from the Percus-Yevick theory. The structure factor S(q) of a system with the number density of particles N/V is given by [38] S(q) -1 = 1 - N c ( q ) .
We have derived from the first cumulant the short-time rotational diffusion coefficient D) as a function of ~b. We present in Fig. 4a a comparison between the results obtained with the two techniques, and also a comparison between the experimental results and the theoretical predictions of Refs. 01 i01 T ' * r'llll i T * ~llrlT 102 T * r ~ 103 104 t (gs) Fig. 3 Normalized time-dependent part of the heterodyne correlation function [a ~ l measured in the forward-scattering configuration (full dots) compared to the normalized field-correlation function extracted from a homodyne intensity correlation measurement at a scattering angle of 15~ (open dots).