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Critical behavior of static properties for nitrobenzene-alkane mixtures

par Perez Sanchez, German;Losada Perez, Patricia ;Cerdeirina, CA;Thoen, Jan
Référence The Journal of Chemical Physics, 132, page (214503)
Publication Publié, 2010-06-07

Article révisé par les pairs

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Résumé :

We present experimental data of the isobaric heat capacity per unit volume Cp,xV−1 Cp,xV−1 for mixtures containing nitrobenzene and an alkane (CNH2N+2 CNH2N+2 , with N ranging from 6 to 15) upon approaching their liquid-liquid critical points along a path of constant composition. Values for the critical amplitude A+ A+ have been determined. They have been combined with the previously reported ones for the leading term of the coexistence-curve width to obtain, with the aid of well-known universal relations, the critical amplitudes of the correlation length and of the osmotic susceptibility. The trends of all these critical parameters, which exhibit anomalous behavior in the low N region, are discussed in terms of particular microscopic phenomena characterizing NB-CNH2N+2 NB-CNH2N+2 mixtures. The work is completed with an analysis of the analog of the Yang-Yang anomaly in liquid-liquid criticality: the behavior of the partial molar heat capacities of the two liquid components is found to illustrate previously uncovered asymmetry effects.