The occurrence of a critical point in lyotropic smectic liquid crystal is experimentally evidenced by neutron and X-ray small-angle scattering experiments. In the vicinity of the critical point in the ( c-T ) phase diagram of a true binary system, we observe: 1) broadening of the Bragg peak of the coexisting lamellar phases; 2) strong scattering at small angle where the concentration and periodicity difference between the two phases ( L α ) in equilibrium vanishes. First approximate values of the critical exponents are given.
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Zemb et al. (1993) studied this question.
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