OPTICAL PROPERTIES OF A TWISTED SMECTIC C
Résumé
A mixture of bis-(4'-n-decyloxybenzal) 2-chloro-1-4-phenylenediamine (D.O.B.C.P.) and 5 % of cholesteryl cinnamate behaves optically in a way similar to cholesteric liquid crystals. Rotatory power and pitch have been measured. De Vries' theory written for the cholesteric phase can be applied, but agreement between experimental and theoretical values is less good for the twisted smectic C phase. It is necessary to know refractive indices of the chiral smectic C layer and to use these indices rather than refractive indices of the non chiral smectic C.
Domaines
Articles anciens
Origine : Accord explicite pour ce dépôt
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