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Large heat capacity anomaly near the consolute point of the binary mixture nitromethane and 3-pentanol

par Losada Perez, Patricia ;Pati Tripathi, Chandrashekhar;Leys, Jan;Glorieux, Christ;Thoen, Jan
Référence The Journal of Chemical Physics, 134, page (044505)
Publication Publié, 2011-01-28

Article révisé par les pairs

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Résumé :

The large critical anomaly in the isobaric heat capacity Cp,x(T) Cp,x(T) of the binary mixture nitromethane + 3-pentanol is measured using high-resolution adiabatic scanning calorimetry. The unique features of this technique provided an alternative approach to the study of the critical behavior of Cp,x(T) Cp,x(T) , providing further Cp,x(T) Cp,x(T) related quantities from which valuable information could be extracted. Our data are in full agreement with the predictions of the Modern Theory of Critical Phenomena; specifically, 3D-Ising model values for the critical exponent α and the universal amplitude ratio values of the leading critical amplitudes, as well as for the first correction-to-scaling ones, provide the optimum fits to represent the experimental data. Evidence for the need of higher-order terms, i.e., first correction-to-scaling term, is given. The large value of the coefficient E for the linear temperature dependence of the background obtained is ascribed to a possible contribution of the regular linear background term, of a higher-order asymmetry term, and of the second correction-to-scaling term. Internal consistency of Cp,x(T) Cp,x(T) and its related quantities is successfully checked.