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Abstract
We report birefringence measurements of the nematic order parameter of the lyotropic liquid crystal formed by aqueous solution of cesium perfluoro-octanoate (CsPFO). For a mole fraction x = 0.035 of CsPFO the first order jump at the nematic-isotropic transition is about twice that in a sample with x = 0.025. The results are analyzed using a Landau-de Gennes model.