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Browsing by Author "Cady, A"

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    Effect of enantiomeric excess on surface structures and phase sequences in free-standing liquid-crystal films
    (2002-12-01)
    Cady, A
    ;
    Liu, ZQ
    ;
    Han, XF
    ;
    Wang, ST
    ;
    Veum, M
    We present differential optical reflectivity and null transmission ellipsometry data from several mixtures of MHPBC enantiomers. From this data, we have determined the chiral smectic phase sequence as a function of enantiomeric excess. The data suggest a change in the structure of the smectic-C(alpha)* phase and the surface tilt state as the enantiomeric excess is reduced. The results also show that the intermediate phases, smectic C(FI2)*, smectic C(FI1)*, and smectic C(alpha)*, disappear sequentially on reducing the net chirality.