In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 38, No. 10R ( 1999-10-01), p. 6118-
Abstract:
The shear-induced molecular orientation of a nematic liquid
crystal, 5CB (4-pentyl-4 ′ -cyanobiphenyl) was studied in a
newly-developed apparatus in which the liquid crystal was confined between optical windows at a film thickness that is continuously
variable. The molecular orientation was measured in situ during shear in the presence and absence of DC electrical bias between
the two surfaces. In this preliminary study we present findings for a spacing of 10 µm, which is comparable to the spacing of
actual liquid crystal display technology. Fourier transform infrared time resolved spectroscopy (FTIR-TRS) synchronized with the shear
motion provided the molecular orientation as a function of time during the shear cycle. Only a slight orientation along the shear direction
was found in the isotropic state but, in the homeotropic state, the molecular orientations in response to shear reflected a competition
process between orientation in orthogonal directions. Shear promoted orientation parallel to the confining plates, and a DC bias voltage
promoted orientation perpendicular to the confining plates.
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.38.6118
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
1999
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
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