title: Microrheology probes length scale dependent rheology.
abstract: 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.
authors.affiliation: Dept. of Physics & DEAS, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: J
authors.initials: J
authors.lastname: Liu
authors.forename: M L
authors.initials: ML
authors.lastname: Gardel
authors.forename: K
authors.initials: K
authors.lastname: Kroy
authors.forename: E
authors.initials: E
authors.lastname: Frey
authors.forename: B D
authors.initials: BD
authors.lastname: Hoffman
authors.forename: J C
authors.initials: JC
authors.lastname: Crocker
authors.forename: A R
authors.initials: AR
authors.lastname: Bausch
authors.forename: D A
authors.initials: DA
authors.lastname: Weitz
mesh_terms: D000199:Actins / Q000737:chemistry*; D004548:Elasticity; D011092:Polyethylene Glycols; D011137:Polystyrenes; D012212:Rheology; D012996:Solutions; D014783:Viscosity
chemical_list: D000199:Actins; D011137:Polystyrenes; D012996:Solutions; D011092:Polyethylene Glycols