Abstract
The discotic nematic (ND)–biaxial nematic (NB)–calamitic nematic (NC) phase transitions are studied in a potassium laurate–decanol–D2O mixture by optical conoscopy. The ND+ (NC−) phase is uniaxial positive (negative) as expected. Nevertheless, inside the biaxial range, beyond the known biaxial positive (NB+) nematic phase we have also found a biaxial negative (NB−) nematic phase optically characterized through conoscopic images. A transition point from a NB+ to a NB− configuration is determined and discussed in this work.
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