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Title: Novel polarization dependence in diffusing-wave spectroscopy of crystalizing colloidal suspensions
Authors: Sanyal, S.
Sood, A.K.
Ramkumar, S.
Ramaswamy, S.
Kumar, N.
Keywords: Colloids
Viscosity of liquids
diffusive momentum transport
Issue Date: May-1994
Publisher: The American Physical Society
Citation: Physical Review Letters, 1994, Vol. 72, p2963
Abstract: We report an unexpected behavior of the intensity autocorrelation functions CVV(t) (polarized) and CHH(t) (depolarized) of multiply scattered light from dense colloidal polyball crystals under certain conditions. We find that CVV(t) saturates at large times as expected for a frozen phase, while CHH(t) decays to zero in a short time as in a fluid. We present a new phenomenological model for this behavior based on decoupled translational and orientational fluctuations in a weakly depolarizing medium. Our study highlights the greater sensitivity of depolarized diffusing-wave spectroscopy as a probe of the dynamics of the medium.
Description: Restricted Access
ISSN: 0031-9007
1079-7114 (Online)
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Copyright: 1994 The American Physical Society
Appears in Collections:Research Papers (TP)

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