Abstract
We have studied the temperature dependence of the extent of dimerization of NO2 dissolved in a mixture of perfluoromethylcyclohexane+carbon tetrachloride near the mixture liquid–liquid critical point. We used the static dielectric constant as a measure of the extent of dimerization. We find that the dimerization decreases near the critical temperature by about 4% and that the functional form of the temperature dependence can be described by a critical exponent of (1−α), where α is the exponent for the heat capacity at constant pressure and composition and has the value 0.11. Such a temperature dependence is in agreement with the theoretical analysis of J. C. Wheeler and R. G. Petschek [Phys. Rev. A 28, 2442 (1983)].
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