Spatially resolved microrheology through a liquid/liquid interface

    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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