Structural changes and orientaional order in a sheared colloidal suspension

Journal Article · Mon Jul 27 04:00:00 EDT 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.69.688· OSTI ID:7201698

Chen, L B; Zukoski, C F ^[1]; Ackerson, B J ^[2]; Hanley, H J.M.; Straty, G C ^[3]; Barker, J; Glinka, C J ^[4]

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1. Department of Chemical Engineering, University of Illinois, Urbana, Illinois 61801 (United States)
2. Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078 (United States)
3. Thermophysics Division, National Institute of Standards and Technology, Boulder, Colorado 80303 (United States)
4. Reactor Radiation Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)

Small angle neutron scattering experiments were carried out on a charged stabilized dense colloidal suspension to observe changes in lattice structure as a function of shear rate. It is shown that (1) the lattice will evolve from a crystalline state in equilibrium to a polycrystalline state if subjected to a very low shear; and (2) as the shear is increased, partial order is reestablished with the apparent appearance of sliding layer flow. The transitions are reversible. The first transition occurs when the dynamic yield stress is exceeded; the second is discontinuous and is associated with an anomalous flow region in which the stress decreases with increasing shear rate.

• OSTI ID: 7201698
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 69:4; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
COHERENT SCATTERING
COLLOIDS
CRYSTALS
DIFFRACTION
DISPERSIONS
ELECTRIC CHARGES
NEUTRON DIFFRACTION
ORDER PARAMETERS
ORIENTATION
PHOTOGRAPHY
POLYCRYSTALS
SCATTERING
SHEAR
SMALL ANGLE SCATTERING
STABILIZATION
STRUCTURE FACTORS
SUSPENSIONS
VARIATIONS