Steady State–Hopf Mode Interactions at the Onset of Electroconvection in the Nematic Liquid Crystal Phase V

International Journal of Molecular Sciences

Gyanu Acharya¹  Gerhard Dangelmayr²  James Gleeson¹ 

[1] Department of Physics, Kent State University, Kent, OH 44242, USA; E-Mails:;Department of Mathematics, Colorado State University, Fort Collins, CO 80523, USA; E-Mail:

关键词: nematic liquid crystals;    electrohydrodynamic convection;    mode interactions;    pattern formation;    amplitude equations;   

DOI  :  10.3390/ijms12074488

来源: mdpi

【 摘 要 】

We report on a new mode interaction found in electroconvection experiments on the nematic liquid crystal mixture Phase V in planar geometry. The mode interaction (codimension two) point occurs at a critical value of the frequency of the driving AC voltage. For frequencies below this value the primary pattern-forming instability at the onset voltage is an oblique stationary instability involving oblique rolls, and above this value it is an oscillatory instability giving rise to normal traveling rolls (oriented perpendicular to and traveling in the director direction). The transition has been confirmed by measuring the roll angle and the dominant frequency of the time series, as both quantities exhibit a discontinuous jump across zero when the AC frequency is varied near threshold. The globally coupled system of Ginzburg–Landau equations that qualitatively describe this mode interaction is constructed, and the resulting normal form, in which slow spatial variations of the mode amplitudes are ignored, is analyzed. This analysis shows that the Ginzburg–Landau system provides the adequate theoretical description for the experimentally observed phenomenon. The experimentally observed patterns at and higher above the onset allow us to narrow down the range of the parameters in the normal form.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.