Abstract
In this work the critical exponents associated with the behavior of the macroscopic orientational order parameter are determined near the reentrant isotropic (IRE)–discotic nematic (ND) and ND–isotropic (I) phase transitions in a lyotropic mixture of potassium laurate, decanol and D2O by measurement of optical birefringence. The critical exponents found indicate that the low temperature ND–IRE phase transition is quasi‐continuous, having a critical exponent, β1∼0.17, which is markedly different from that found at the classical ND–I phase transition, β2∼0.38. The results are discussed and compared with others obtained with different lyotropic mixtures.
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