title: Fast relaxation of a hexagonal Poiseuille shear-induced near-surface phase in a threadlike micellar solution.
abstract: 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.
authors.affiliation: Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA.
authors.forename: W A
authors.initials: WA
authors.lastname: Hamilton
authors.forename: P D
authors.initials: PD
authors.lastname: Butler
authors.forename: L J
authors.initials: LJ
authors.lastname: Magid
authors.forename: Z
authors.initials: Z
authors.lastname: Han
authors.forename: T M
authors.initials: TM
authors.lastname: Slawecki