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Electrohydrodynamic instability in some nematic cyanobiphenyls in an a.c. electric field
Authors:D. K. Rout   R. N. P. Choudhary
Affiliation: a Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur, India
Abstract:Electrohydrodynamic instability in homeotropically oriented nematic samples of 4'-n-octyl-4-cyano-biphenyl and 4'n-alkyloxy-4-cyanobiphenyl, (n = 8.9) have been studied in an a.c. electric field. The domain patterns during the instability in these compounds in a very low frequency a.c. field are very similar to those in a d.c. field. The domain patterns observed at higher frequencies have been identified as 'maltese crosses' or 'crossed isogyres'. The electro-convective 'isotropic' flows near the electrode play an important role in the observed instability.
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