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In contrast to the predictions of the standard theory of electroconvection(EC), our experiments showed that the action of superposed ac and dc voltagesrather inhibits pattern formation than favours the emergence of instabilities;the patternless region may extend to much higher voltages than the individualac or dc thresholds. The pattern formation induced by such asymmetrical voltagewas explored in a nematic liquid crystal in a wide frequency range. Thefindings could be qualitatively explained for the conductive EC, but representa challenging problem for the dielectric EC.

Inhibited pattern formation by asymmetrical high voltage excitation in nematic fluids