Fast relaxation of a hexagonal Poiseuille shear-induced near-surface phase in a threadlike micellar solution.
The dynamics of near-surface conformations in complex fluids under flow should dramatically affect their rheological properties. We have made the first measurements resolving the decay kinetics of a hexagonal phase induced in a threadlike polyionic micellar system under Poiseuille shear near a quartz surface. Upon cessation of shearing flow, this minimum interference crystalline phase formed within approximately 20 microm of the surface "melts" to a metastable two-dimensional liquid of aligned micelles in approximately 0.7 s. This is some three orders of magnitude shorter than the time required for bulk (Couette) shear-aligned micelles in this system to reach a fully entangled state.
Hamilton
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Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA.
Butler
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Magid
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Han
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Slawecki
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