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Phonon Dispersion in Suspensions of Hard Sphere Colloids*

Published online by Cambridge University Press:  28 February 2011

D.A. Weitz ,
J. Liu ,
L. Ye  and
Ping Sheng
D.A. Weitz
Affiliation:
Exxon Research and Engineering Co., Rt 22E, Annandale, NJ 08801
J. Liu
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
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Abstract

We use Brillouin scattering to measure the dispersion of the propagating acoustic modes in a suspension of hard sphere colloids. We find two distinct longitudinal modes when the sound wavelength becomes comparable to the sphere diameter. The higher frequency mode has a velocity intermediate between those of the pure solid and the pure liquid phases, and its velocity increases with increasing volume fraction, ø. The lower frequency mode has a velocity less than the velocities in either the pure fluid or pure solid phases, and its velocity decreases with increasing ø. We interpret the higher frequency mode as a compressional wave which propagates through both the solid and the fluid, as expected for a composite medium. The lower frequency mode has not been observed before, and is interpreted as a surface acoustic mode, which propagates between adjacent spheres through a decaying portion of the excitation in the fluid.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 195: Symposium S – Physical Phenomena in Granular Materials , 1990 , 93
Copyright
Copyright © Materials Research Society 1990

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References

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