Shear induced hexagonal ordering observed in an ionic viscoelastic fluid in flow past a surface

Journal Article · Mon Apr 04 04:00:00 EDT 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.2219· OSTI ID:5074453

Hamilton, W A; Butler, P D; Baker, S M; Smith, G S; Hayter, J B; Magid, L J; Pynn, R ^[1]

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1. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States) Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996 (United States) Manuel Lujan, Jr. Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States) Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506 (United States)

We present the first clear evidence of a shear induced hexagonal phase in a polyionic fluid in flow past a plane quartz surface. The dilute surfactant solution studied is viscoelastic due to the formation and entanglement of highly extended charged threadlike micelles many thousands of A long, which are known to align along the flow direction under shear. Small-angle neutron diffraction data show that in the high shear region within a few tens of microns of the surface these micelles not only align, but form a remarkably well ordered hexagonal array separated by 370 A, 8 times their 46 A diameter.

• DOE Contract Number: AC05-84OR21400; W-7405-ENG-36
• OSTI ID: 5074453
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 72:14; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

661300* -- Other Aspects of Physical Science-- (1992-)
665100 -- Nuclear Techniques in Condensed Matter Physics -- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
DISPERSIONS
FLUID FLOW
HEXAGONAL LATTICES
MICELLAR SYSTEMS
MIXTURES
NEUTRON DIFFRACTION
ORDER-DISORDER TRANSFORMATIONS
PHASE TRANSFORMATIONS
SCATTERING
SHEAR
SOLUTIONS
VISCOUS FLOW