The liquid−liquid coexistences of temperature vs refractive index (T−n), temperature vs mole fraction (T−x), and temperature vs volume fraction (T−ϕ) for dimethyl carbonate + hexadecane and dimethyl carbonate + octadecane have been determined within 10 K from the critical temperatures. The critical amplitudes B and the critical exponents β have been deduced from the coexistence curves. The results have also been analyzed to determine Wegner correction terms and to examine the asymmetric behavior of the diameters of the coexistence curves. Experimental values of β are consistent with the 3D Ising value in the whole temperature range investigated for (T−n) and (T−ϕ), while the tendency of crossover to the mean field value was detected for (T−x). The data of coexistence curves (T−x) were fitted with the crossover equation proposed by Anisimov and Sengers to obtain the crossover parameters. It was found that the contribution of the regular term was significant as the temperature was far away from the critical point and the value of effective critical exponent increased with the distance from the critical point, exhibiting the monotonic crossover from the Ising to the mean-field critical behaviors.
Liquid−liquid coexistence curves and turbidity measurements for the binary fluid mixture of {benzonitrile + tridecane} were conducted, from which the corresponding critical exponents and critical amplitudes were obtained. It was found that the critical exponents were in accordance with the theoretic predictions and the critical amplitudes supported the well-known two-scale-factor universality. Moreover, the coexistence curve plotted with temperature against mole fraction was found to be well-represented by the formulism proposed by Gutkowski et al. in the frame of the crossover theory, and the asymmetry of its diameter confirmed the complete scaling theory.
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