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The temperature dependence of the flow alignment angle has been measured in two nematic liquid crystals, p^'-methoxybenzylidene-p-n-butylaniline and p-n-hexyloxybenzylidene-p^'-aminobenzonitrile. For both compounds this angle reaches a peak value at the nematic-isotropic transition point. Experimental evidence is reported for the first time that flow alignment does not occur over the entire mesophase of certain nematics.
Ch. Gähwiller (Mon,) studied this question.