Title

Spatially resolved microrheology using localized coherence volumes

Authors

Authors

G. Popescu; A. Dogariu;R. Rajagopalan

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

Phys. Rev. E

Keywords

COMPLEX FLUIDS; SOFT MATERIALS; ATOMIC-FORCE; VISCOELASTICITY; NETWORKS; PARTICLE; MODULI; Physics, Fluids & Plasmas; Physics, Mathematical

Abstract

We propose an optical technique, based on dynamic light scattering, for investigating the local rheological response of a complex fluid over a frequency range larger than that provided by standard mechanical instrumentation. The low-coherence radiation used in a fiber optics configuration allows the measurements to be confined to a small volume around a tenth of a picoliter. The ability of the method to accurately measure both loss and storage moduli has been tested using both simple Newtonian liquids and viscoelastic, complex fluids. The possibility to monitor liquid-gel transitions in polymer solutions has also been demonstrated. The unique capability of the technique to localize the measurement volume suggests that this novel approach can be used for three-dimensional mapping of rheological properties in heterogeneous systems.

Journal Title

Physical Review E

Volume

65

Issue/Number

4

Publication Date

1-1-2002

Document Type

Article

Language

English

First Page

8

WOS Identifier

WOS:000175146400034

ISSN

1539-3755

Share

COinS