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Kinetics of Shear Induced Micellar Association

Published online by Cambridge University Press:  25 February 2011

L. E. Dewalt ,
H. D. Ou-Yang ,
M. W. Kim ,
S-N Liu ,
D. Pine ,
P. Dixon  and
D. G. Peiffer
L. E. Dewalt
Affiliation:
Department of Physics, Lehigh University Bethlehem, PA 18015
H. D. Ou-Yang
Affiliation:
Department of Physics, Lehigh University Bethlehem, PA 18015
M. W. Kim
Affiliation:
Exxon Research and Engineering Company Annandale, NJ 08801
S-N Liu
Affiliation:
Exxon Research and Engineering Company Annandale, NJ 08801
D. Pine
Affiliation:
Exxon Research and Engineering Company Annandale, NJ 08801
P. Dixon
Affiliation:
Exxon Research and Engineering Company Annandale, NJ 08801
D. G. Peiffer
Affiliation:
Exxon Research and Engineering Company Annandale, NJ 08801
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Abstract

Rheological measurements have been used to study the kinetics of shear induced association for rod-shape micelles formed by mixtures of ADHAB and salicylic-sodium salt. Pronounced hysteresis and large fluctuations were found in the stress-shear rate diagram. We investigate the association and dissociation mechanism through stress quench experiments where viscosity measurements study the system relaxation. The association process was found to be a single exponential with a relaxation time of about 1 minute, whereas the dissociation process was much slower and was non-exponential. In the semidilute regime, the critical shear rates increase with concentration, contradictory with existing theories.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 248: Symposium O – Complex Fluids , 1991 , 203
Copyright
Copyright © Materials Research Society 1992

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