Abstract
A surface of the phase diagram of the cholesteric lyotropic liquid crystal potassium laurate/1-decanol/D/sub 2/O/brucine sulfate heptahydrate/ferrofluid is studied by optical microscopy and X-ray diffraction as a function of the temperature and the relative molar concentration of brucine. The cholesteric pitches as a function of the brucine content are shown to have two independent behaviors for low and high brucine concentration. The brucine doping and its influence in favoring the cholesteric discotic phase formation are discussed in terms of the brucine packing at the electric double layer and its influence on the orientational fluctuations.
Published Version
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