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Nanorheology of Polymers, Block Copolymers, and Complex Fluids

Published online by Cambridge University Press:  15 February 2011

A. Levent Demirel ,
Lenore Cai ,
Ali Dhinojwala ,
Steve Granick  and
J. M. Drake
A. Levent Demirel
Affiliation:
Department of Materials Science and EngineeringUniversity of IllinoisUrbana, IL 61801
Lenore Cai
Affiliation:
Department of Materials Science and EngineeringUniversity of IllinoisUrbana, IL 61801
Ali Dhinojwala
Affiliation:
Department of Materials Science and EngineeringUniversity of IllinoisUrbana, IL 61801
Steve Granick
Affiliation:
Department of Materials Science and EngineeringUniversity of IllinoisUrbana, IL 61801
J. M. Drake
Affiliation:
Exxon Research & Engineering Corp. Annandale, NJ 08801
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Abstract

The shear rheology of molecularly-thin films of fluids has been studied experimentally as it depends on sinusoidal frequency (linear response) or on sliding velocity (nonlinear response). Building upon previous identification of a solidlike state that is induced by confinement, we find the shearinduced transition to a sliding state in which the viscous dissipation is essentially velocity-independent. The mechanism appears to involve wall slip but Fourier transforms of the response reveal fluctuations, intrinsic to the sliding state, over all accessible frequencies. Other ongoing studies involve shear-induced changes in the fluorescence of confined fluorescent probes, shear dilatancy, and the contrast between the shear of simple nonpolar fluids, and block copolymers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 366: Symposium N – Dynamics in Small Confining Systems , 1994 , 113
Copyright
Copyright © Materials Research Society 1995

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