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Colloidal Dynamics from Forced Rayleigh Scattering

Published online by Cambridge University Press:  25 February 2011

C. Gochanour ,
S. Mazur  and
M.S. Wolfe
M.S. Wolfe
Affiliation:
E.I. Dupont de Nemours & Co., Inc., Wilmington, Delaware 19880-0356
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Abstract

Colloidal suspensions are remarkable analogues of molecular fluids. In particular, at high volume fraction (Φv) they share two characteristic features with super-cooled molecular liquids: the appearance of two distinct modes of translational motion (fast and slow diffusive modes), and a critical retardation of the latter as Φv approaches random close packing (a colloidal “glass transition”). These phenomena have been studied extensively by photon correlation spectroscopy (PCS) [1-4] and are the subject of many theoretical analyses [5-12]. This paper concerns the use of forced Rayleigh scattering (FRS) to address questions not resolved by existing data or theory. We report: 1) properties of a hydrophobic silica colloid bearing photoactive azo-dye groups suitable for FRS studies, and 2) preliminary results from FRS measurements which reveal some unanticipated features regarding the transition from short-time to long-time self-diffusion at small k.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 248: Symposium O – Complex Fluids , 1991 , 253
Copyright
Copyright © Materials Research Society 1992

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