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Dynamics of Concentrated Colloidal Suspensions

Published online by Cambridge University Press:  21 February 2011

D. A. Weitz ,
L. Ye ,
Ping Sheng ,
J. S. Huang ,
D. J. Pine ,
J. Liu ,
P. M. Chaikin  and
P. N. Pusey
D. A. Weitz
Affiliation:
Exxon Research and Engineering Co, Rt. 22E, Annandale NJ 08801.
L. Ye
Affiliation:
Exxon Research and Engineering Co, Rt. 22E, Annandale NJ 08801.
Ping Sheng
Affiliation:
Exxon Research and Engineering Co, Rt. 22E, Annandale NJ 08801.
J. S. Huang
Affiliation:
Exxon Research and Engineering Co, Rt. 22E, Annandale NJ 08801.
D. J. Pine
Affiliation:
Exxon Research and Engineering Co, Rt. 22E, Annandale NJ 08801.
J. Liu
Affiliation:
Exxon Research and Engineering Co, Rt. 22E, Annandale NJ 08801.
P. M. Chaikin
Affiliation:
Dept. of Physics, Princeton University, Princeton NJ 08540.
P. N. Pusey
Affiliation:
Royal Signals and Radar Establishment, Malvern Worchestershire WR14 3PS UK.
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Abstract

We study the dynamics of concentrated colloidal suspensions by measuring the frequency dependent structure factor, S(q,w), using light scattering techniques. We introduce Diffusing Wave Spectroscopy, which extends dynamic light scattering to the multiple scattering regime, allowing us to study the lower frequency, diffusive modes of S(q,w), which reflect the Brownian motion of the particles. We study the behavior of the higher-frequency, propagating modes of S(q,w), which reflect acoustic waves, using Brillouin scattering. To study S(q,w) at low qa, where q is the scattering vector and a the particle diameter, we use inverted micelles, and find that the interactions between the micelles has a dramatic impact on the speed of sound as the volume fraction of micelles increases. To study S(q,w) at large qa, we use index matched PMMA particles, allowing us to measure the dispersion curve of phonons in a hard sphere colloid system. Together, these results provide a measure of S(q, w) over a wide range of q and of w.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 177: Symposium V – Macromolecular Liquids , 1989 , 207
Copyright
Copyright © Materials Research Society 1990

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References

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