The authors report the results of measurements of the center of mass and relative pair diffusion coefficients in quasi-one-dimensional (q1D) and quasi-two-dimensional (q2D) binary colloid suspensions. The new results extend the findings of similar studies of one-component quasi-one-dimensional and quasi-two-dimensional colloid suspensions. Our principal new finding is that the presence of the smaller diameter component can destroy the oscillatory structure of the separation dependence of the q2D relative pair diffusion coefficient of the large particles even though the oscillatory character of the large particle equilibrium pair correlation function remains prominent, and that no such effect occurs with the q1D suspension. An interpretation of these results is proposed.
Bibliographical noteFunding Information:
The research reported in this paper has been supported by the National Science Foundation (CTS-021174 and CHE-9977841), the Israel Science Foundation (77/03), the NSF-funded MRSEC laboratory at The University of Chicago, and by a Senior Mentor Grant to S.A.R. from the Dreyfus Foundation.