Nematic PAA, exposed to a vertical temperature difference ΔT, exhibits oscillatory convection whose frequency ω can be measured by real-time neutron scattering. We have studied the soft-mode character and the physical origin of the phenomenon, and discuss their relation to phenomena at equilibrium phase transitions. The Fourier components of the observed power spectrum reveal a change of the flow pattern at increasing ΔT that can be compared with predictions from hydrodynamics and with theories of chaos. Finally we have studied the decreasing slope of the soft mode (defined as ω2 /ΔT) as the mean temperature of the sample is approaching the supercooling limit.
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Riste et al. (1990) studied this question.
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