Renormalized Ising behavior of critical nonionic surfactant solution

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Abstract
The critical behavior of a nonionic surfactant, heptaethyleneglycol mono- n -tetradecyl ether ( C 14 E 7 ), in an aqueous tetramethylammonium chloride (TMAC) solution was investigated by the combined use of turbidity and light scatteringmeasurements 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.