Abstract
The critical behavior of a nonionic surfactant, heptaethyleneglycol mono-n-tetradecyl ether (C14E7), in an aqueous tetramethylammonium chloride (TMAC) solution was investigated by the combined use of turbidity and light scattering measurements concerning the critical exponents of the isothermal osmotic compressibility and the long-range correlation length. Both the critical exponents and the critical points depend on the TMAC concentration. Critical exponents increase with the increase of salt concentration showing a deviation from the three-dimensional Ising model. The critical behaviors are well described by a continuous change from the three-dimensional Ising model to Fisher’s renormalized Ising model.
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