Abstract
Abstract Birefringence measurements have been made on lyotropic nematic phases prepared from the detergent tetradecyl-trimethylammonium bromide. Assignments for the sign of the birefringence of the nematic disk and cylindrical phases of both positive and negative diamagnetic anisotropy have been made. It is suggested the classification of lyotropic nematic phases, based on the sign of the diamagnetic anisotropy or any other physical parameter, should be dropped. Classification should be in terms of thermodynamic properties, i.e. micelle structure.
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