Acoustic Excitations in Suspensions of Soft Colloids

R. S. Penciu; G. Fytas; E. N. Economou; W. Steffen; S. N. Yannopoulos

doi:10.1103/PhysRevLett.85.4622

Acoustic Excitations in Suspensions of Soft Colloids

R. S. Penciu, G. Fytas, E. N. Economou, W. Steffen, and S. N. Yannopoulos

Phys. Rev. Lett. 85, 4622 – Published 20 November 2000

Abstract

Vibrational modes in suspensions of soft colloids in a fluid can be detected experimentally by Brillouin light scattering. Besides the usual acoustic mode, being essentially the longitudinal phonon of the liquid matrix, an “opticlike” mode is observed in giant starlike micelles at low volume fractions. We propose that this opticlike mode is due mainly to the internal vibration of each hairy particle.

Received 11 August 2000

DOI:https://doi.org/10.1103/PhysRevLett.85.4622

Authors & Affiliations

R. S. Penciu^2,*, G. Fytas^1,3, E. N. Economou^1,2, W. Steffen³, and S. N. Yannopoulos⁴

¹FO.R.T.H., Institute of Electronic Structure and Laser, P.O. Box 1527, 71110, Heraklion, Crete, Greece
²Physics Department, University of Crete, Greece
³Max-Planck Institute for Polymer Research, P.O. Box 3148, 55128 Mainz, Germany
⁴FO.R.T.H., Institute of Chemical Engineering, P.O. Box 1414, 26500 Patras, Greece