In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 35, No. 9S ( 1996-09-01), p. 5046-
Abstract:
Molecular orientational structures in chiral smectic phases of a family of antiferroelectric liquid crystals (AFLCs) with different alkyl chain lengths were investigated by means of optical rotatory power and circular dichroism measurements. In the ferroelectric chiral smectic C phase, SmC * , molecules of rectus configuration are arranged in a left-handed helix, and the pitch of the helix becomes longer and saturates to a constant value with decreasing temperature.
In the antiferroelectric chiral smectic C A phase, SmC A * , the helical handedness is opposite to that of SmC * , and the helical pitch is shorter than that of SmC * and independent of temperature. In some AFLCs with shorter alkyl chain, however, a divergence of the pitch and a simultaneous change in the handedness were observed in SmC A * . Alkyl chains in AFLCs play an important role in stabilizing the helical structures, and the molecules with long alkyl chains tend to form a tight helix. The experimental results for subphases between SmC * and SmC A * were discussed on the basis of the competition between helical twisting powers of the phases.
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.35.5046
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
1996
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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