Title

Spatially resolved microrheology through a liquid/liquid interface

Authors

Authors

I. S. Sohn; R. Rajagopalan;A. C. Dogariu

Comments

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Abbreviated Journal Title

J. Colloid Interface Sci.

Keywords

microrheology; viscoelastic modulus; localized coherence volume dynamic; light scattering; multi-Lorentzian; DYNAMIC LIGHT-SCATTERING; COMPLEX FLUIDS; VISCOELASTIC MODULI; INTEGRAL-EQUATIONS; RHEOLOGY; FLUCTUATIONS; Chemistry, Physical

Abstract

We present a light-scattering technique for the measurement of the microrheological properties of viscoelastic liquids in small volumes over a large frequency range (on the order of eight decades). The accuracy of the method for model viscoelastic liquids (polyethylene oxide solutions in water) is demonstrated by comparing the results with conventional mechanical measurements of the lass and storage moduli. Then we show that the method can be used to measure variations in viscoelastic properties in a heterogeneous system by measuring the variation in the moduli with position (and time) across a liquid/liquid interface between a viscoelastic polymer solution and a Newtonian liquid. (C) 2003 Elsevier Inc. All rights reserved.

Journal Title

Journal of Colloid and Interface Science

Volume

269

Issue/Number

2

Publication Date

1-1-2004

Document Type

Article

Language

English

First Page

503

Last Page

513

WOS Identifier

WOS:000187574500032

ISSN

0021-9797

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