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Aspects of the dynamics of colloidal suspensions: Further results of the mode-coupling theory of structural relaxation | | M. Fuchs
; M. R.Mayr
; | | Date: |
11 Aug 1999 | | Subject: | Soft Condensed Matter; Disordered Systems and Neural Networks | cond-mat.soft cond-mat.dis-nn | | Abstract: | Results of the idealized mode-coupling theory for the structural relaxation in suspensions of hard-sphere colloidal particles are presented and discussed with regard to recent light scattering experiments. The structural relaxation becomes non-diffusive for long times, contrary to the expectation based on the de Gennes narrowing concept. A semi-quantitative connection of the wave vector dependences of the relaxation times and amplitudes of the final $alpha$-relaxation explains the approximate scaling observed by Segr{è and Pusey [Phys. Rev. Lett. {f 77}, 771 (1996)]. Asymptotic expansions lead to a qualitative understanding of density dependences in generalized Stokes-Einstein relations. This relation is also generalized to non-zero frequencies thereby yielding support for a reasoning by Mason and Weitz [Phys. Rev. Lett {f 74}, 1250 (1995)]. The dynamics transient to the structural relaxation is discussed with models incorporating short-time diffusion and hydrodynamic interactions for short times. | | Source: | arXiv, cond-mat/9908166 | | Services: | Forum | Review | PDF | Favorites | |
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