scholarly journals Coarsening of a Quiescent Electrorheological Fluid I: Experiment

1992 ◽  
Vol 289 ◽  
Author(s):  
James E. Martin ◽  
Judy Odinek ◽  
Thomas C. Halsey
Keyword(s):  
Light Scattering ◽  
Solid Phase ◽  
Electrorheological Fluid ◽  
Two Dimensional ◽  
Strong Light ◽  
Scattering Study ◽  
Evolution Of Structure ◽  
Field Lines ◽  
Particle Chaining ◽  
Kinetics Of

AbstractWe report a real-time, two-dimensional light scattering study of the evolution of structure in a concentrated electrorheological fluid during the ‘liquid-solid’ phase transition. We find that after particle chaining along the electric field lines, strong light scattering lobes appear at a finite scattering wavevector q orthogonal to the field lines, and then brighten as they move to q=0. This indicates the existence of an unstable concentration fluctuation that signifies the segregation of chains into columns. In fact, the observed growth kinetics of the characteristic length, as well as the form of the structure factor, are qualitatively similar to two-dimensional spinodal decomposition in a system with a conserved order parameter.

Coarsening of a Quiescent Electrorheological Fluid II: Theory

1992 ◽  
Vol 289 ◽  
Author(s):  
Thomas C. Halsey
Keyword(s):  
Phase Transition ◽  
Light Scattering ◽  
Solid Phase ◽  
Electrorheological Fluid ◽  
Good Accord ◽  
Scattering Measurements ◽  
Thermal Mechanism ◽  
Solid Phase Transition ◽  
Field Lines ◽  
Chain Interaction

AbstractThe coarsening observed orthogonal to the field lines in light scattering studies of a quiescent electrorhcological fluid during the “liquid-solid” phase transition can be qualitatively understood using the thermal mechanism of chain interaction proposed by Halsey and Toor. By analyzing fluctuations in the interaction between chains, we predict a power-law increase of the column width with time, with a time constant that decreases as a power of the electric field. Lubrication forces between the particles may control the time scale of these fluctuations. These predictions are in good accord with light scattering measurements.

scholarly journals Light Scattering Studies of an Electrorheological Fluid in Oscillatory Shear

1994 ◽  
Vol 366 ◽  
Author(s):  
James E. Martin ◽  
Judy Odinek
Keyword(s):  
Light Scattering ◽  
Electrorheological Fluid ◽  
Theoretical Description ◽  
Structural Theory ◽  
Oscillatory Shear ◽  
Two Dimensional ◽  
Nonlinear Rheology ◽  
Particle Chain ◽  
Scattering Study ◽  
Er Fluids

ABSTRACTWe have conducted a real time, two-dimensional light scattering study of the nonlinear dynamics of field-induced structures in an electrorheological fluid subjected to oscillatory shear. We have developed a theoretical description of the observed dynamics by considering the response of a fragmenting/aggregating particle chain to the prevailing hydrodynamic and electrostatic forces. This structural theory is then used to describe the nonlinear rheology of ER fluids.

Light scattering study of the cationic decomposition kinetics of polydioxolane (PDO)

1971 ◽  
Vol 13 (4) ◽  
pp. 975-982 ◽  
Author(s):  
I.M. Bel'govskii ◽  
L.S. Sakhonenko ◽  
V.V. Ivanov ◽  
N.S. Yenikolopyan
Keyword(s):  
Light Scattering ◽  
Decomposition Kinetics ◽  
Scattering Study ◽  
Kinetics Of

scholarly journals LIGHT SCATTERING STUDIES OF AN ELECTRORHEOLOGICAL FLUID IN OSCILLATORY SHEAR

1996 ◽  
Vol 10 (23n24) ◽  
pp. 3257-3266 ◽  
Author(s):  
JAMES E. MARTIN ◽  
JUDY ODINEK
Keyword(s):  
Light Scattering ◽  
Electrorheological Fluid ◽  
Structural Theory ◽  
Oscillatory Shear ◽  
Chain Model ◽  
Kinetic Chain ◽  
Nonlinear Rheology ◽  
Particle Chain ◽  
Scattering Study ◽  
Er Fluids

We have conducted a real time, two-dimensional light scattering study of the nonlinear dynamics of field-induced structures in an electrorheological fluid subjected to oscillatory shear. We have developed a kinetic chain model of the observed dynamics by considering the response of a fragmenting/aggregating particle chain to the prevailing hydrodynamic and electrostatic forces. This structural theory is then used to describe the nonlinear rheology of ER fluids.

Secondary structure and association of melittin during and after solid-phase synthesis: a Raman and static light scattering study

2002 ◽  
Vol 33 (3) ◽  
pp. 142-146 ◽  
Author(s):  
C. Lund Hansen ◽  
P. Robert Hansen ◽  
T. H. Callisen ◽  
R. Bauer ◽  
O. Faurskov Nielsen
Keyword(s):  
Light Scattering ◽  
Secondary Structure ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Static Light Scattering ◽  
Phase Synthesis ◽  
Scattering Study
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