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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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References

1)Kops-Werkhoven, M.M., & Fijnaut, H.M., J. Chem. Phys.,77, 2242 and 5913 (1982).Google Scholar
2)Pusey, P.N. & Megen, W. van, J. de Physique, 44, 285, (1983).Google Scholar
3)Megen, W. van & Underwood, S.M., J. Chem. Phys.,88, 7841 (1988); 21, 552 (1989).Google Scholar
4)Megen, W. van & Pusey, P.N., Phys. Rev. A, 43, 5429, (1991).Google Scholar
5)Batchelor, G.K., J. Fluid Mech., 74, 1, (1976).CrossRefGoogle Scholar
6)Hess, W. & Klein, R., Physica, 105A, 552 (1981).Google Scholar
7)Beenaker, C.W.J. & Mazur, P., Physica, 126A, 349 (1984).CrossRefGoogle Scholar
8)Ackerson, B.J., Pusey, P.N., & Tough, R.J.A., J. Chem. Phys., 76 (1982).Google Scholar
9)Pusey, P.N. & Tough, R.J.A., Far. Soc. Disc., 76, 123, (1983).Google Scholar
10)Medina-Noyola, M., Phys. Rev. Let., 60, 2705 (1988).Google Scholar
11)Jones, D.M., Muthukumar, M., & Cohen, S.M., J. Chem. Phys.,90, 7542, (1989).Google Scholar
12)Götze, W. & Sörgren, L., Phys. Rev. A, 41, 5442, (1991).CrossRefGoogle Scholar
13)Pusey, P.N., Fijnaut, H.M., & Vrij, A., J. Chem. Phys., 27, 4270, (1982).Google Scholar
14)Hervet, H., Leger, L., & Rondelez, F., Phys. Rev. Let., 42, 1681, (1978).Google Scholar
15)Mazur, S., Raty, R.G., & Manring, L.E., in preparation.Google Scholar
16)Ross, D.L. & Blanc, J., in “Photochromism”, Brown, G.H., Ed., Vol. III, Chap. V, Wiley-Interscience, N.Y., 1971.Google Scholar