Microrheology probes length scale dependent rheology

We exploit the power of microrheology to measure the viscoelasticity of entangled F-actin solutions at different length scales from 1 to 100 microm over a wide frequency range. We compare the behavior of single probe-particle motion to that of the correlated motion of two particles. By varying the a...

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Bibliographic Details
Published in:Physical review letters 2006-03, Vol.96 (11), p.118104-118104, Article 118104
Main Authors: Liu, J, Gardel, M L, Kroy, K, Frey, E, Hoffman, B D, Crocker, J C, Bausch, A R, Weitz, D A
Format: Article
Language:English
Subjects:
Actins - chemistry
Elasticity
Polyethylene Glycols
Polystyrenes
Rheology
Solutions
Viscosity
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Summary:We exploit the power of microrheology to measure the viscoelasticity of entangled F-actin solutions at different length scales from 1 to 100 microm over a wide frequency range. We compare the behavior of single probe-particle motion to that of the correlated motion of two particles. By varying the average length of the filaments, we identify fluctuations that dissipate diffusively over the filament length. These provide an important relaxation mechanism of the elasticity between 0.1 and 30 rad/sec.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.96.118104