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Onset of electroconvection of homeotropically aligned nematic liquid crystals Sheng-Qi Zhou,1
 

Summary: Onset of electroconvection of homeotropically aligned nematic liquid crystals
Sheng-Qi Zhou,1
NŠndor …ber,2
Ńgnes Buka,2
Werner Pesch,3
and Guenter Ahlers1
1
Department of Physics and iQCD, University of California, Santa Barbara, California 93106, USA
2
Research Institute for Solid State Physics and Optics, H-1525 Budapest P.O. Box 49, Hungary
3
Physikalisches Institut der Universitšt Bayreuth, D-95440 Bayreuth, Germany
Received 9 February 2006; published 19 October 2006
We present experimental measurements near the onset of electroconvection EC of homeotropically aligned
nematic liquid crystals Phase 5A and MBBA. A voltage of amplitude 2V0 and frequency f was applied. With
increasing V0, EC occurred after the bend Freedericksz transition. We found supercritical bifurcations to EC
that were either stationary bifurcations or Hopf bifurcations to traveling convection rolls, depending on the
sample conductances. Results for the onset voltages Vc, the critical wave numbers kc, the obliqueness angles c,
and the traveling-wave Hopf frequencies at onset c over a range of sample conductances and driving
frequencies are presented and compared, to the extent possible, with theoretical predictions. For the most part

  

Source: Ahlers, Guenter - Department of Physics, University of California at Santa Barbara
Schmidt, Matthias - Physikalisches Institut, Universitšt Bayreuth

 

Collections: Materials Science; Physics