The determination of the viscosity coefficients of nematic liquid crystals

O'Neill, Gemma

doi:10.1080/02678298608086514

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1987

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Cited by 6 publications

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“…Various methods can be used to measure viscosity coefficients in the nematic phase, for instance shear flow in a magnetic field, light scattering and ultrasonic shear waves [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of the Frederiks transition in nematics consisting of disc-like molecules Thermal dependence of a bend viscosity coefficient

1988

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We report measurements of the dynamics of the magnetic Frederiks transition in nematics consisting of disc-like molecules. In this paper the results are presented for three 2, 3, 6, 7, 10, 11-hexakis(p-alkoxybenzoyloxy)triphenylenes, which exhibit a normal nematic phase, and for three 2, 3, 7, 8, 12, 13-hexa(alkanoyloxy)truxenes, which exhibit an inverted nematic phase. We find that the thermal dependence of a bend viscosity coefficient (y,*) can be accurately described by the expression, yi * -S2 exp (E.1kT). The absolute value of y * is found to be higher (by a factor of 10-100) than is commonly encountered in nematics consisting of rod-like molecules.

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“…Various methods can be used to measure viscosity coefficients in the nematic phase, for instance shear flow in a magnetic field, light scattering and ultrasonic shear waves [9][10][11].…”

Section: Introductionmentioning

confidence: 99%