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
ISSN
1539-3755
Recommended Citation
Popescu, G.; Dogariu, A.; and Rajagopalan, R., "Spatially resolved microrheology using localized coherence volumes" (2002). Faculty Bibliography 2000s. 3407.
https://stars.library.ucf.edu/facultybib2000/3407
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