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- Duncan M Frasch, Daniel R Spiegel
- The Journal of chemical physics
- 2014

Forced Rayleigh scattering is used to study the tracer diffusion of an azobenzene in binary combinations of polar solvents, including water. In the absence of water, the tracer diffusion coefficient D in the mixture lies between the diffusion coefficients within the pure solvents, on a curve that is reasonably close to the prediction of free-volume theory.… (More)

- Daniel R Spiegel, Paulses C Kollie, Scott J Van Tilburg
- The Journal of chemical physics
- 2014

Using forced Rayleigh scattering, the tracer diffusion of methyl red through water and eight other solvents at different temperatures is investigated and the results are compared to the Cohen-Turnbull theory of free-volume diffusion. In seven solvents the effective non-Arrhenius activation energy measured experimentally agrees with the Cohen-Turnbull… (More)

- N C Giebink, E R Johnson, +4 authors C C Allen
- Physical review. E, Statistical, nonlinear, and…
- 2004

We first report that, for planar nematic 4-methoxy-benzilidene-4-butylaniline (MBBA), the electroconvection threshold voltage has a nonmonotonic temperature dependence, with a well-defined minimum, and a slope of about -0.12 V/degrees C near room temperature at 70 Hz. Motivated by this observation, we have designed an experiment in which a weak… (More)

- Daniel R Spiegel, Elliot R Johnson, Skyler R Saucedo
- Physical review. E, Statistical, nonlinear, and…
- 2006

We report a liquid-crystal pattern-formation experiment in which we break the lateral (translational) symmetry of a nematic medium with a laser-induced thermal gradient. The work is motivated by an improved measurement (reported here) of the temperature dependence of the electroconvection threshold voltage in planar-nematic… (More)

- Karen K Vardanyan, Daniel R Spiegel
- Physical review. E, Statistical, nonlinear, and…
- 2007

We propose a simple one-dimensional linear model to describe the formation of localized traveling waves due to material parameter ramps in nematic liquid crystals. We assume that due to some external perturbation the material parameters (conductivity, dielectric constants, viscosity, elasticity) of the liquid crystal become slowly varying functions of… (More)

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