title: The critical behavior of the dielectric constant in the polar + polar binary liquid mixture nitromethane + 3-pentanol: an unusual sign of its critical amplitude in the one-phase region.
abstract: Dielectric constant measurements have been carried out in the one- and two-phase regions near the critical point of the polar + polar binary liquid mixture nitromethane + 3-pentanol. In the two-phase region, evidence for the |t|(2β) singularity in the coexistence-curve diameter has been detected, thus confirming the novel predictions of complete scaling theory for liquid-liquid criticality. In the one-phase region, an "unusual" negative sign for the amplitude of the |t|(1-α) singularity has been encountered for the first time in an upper critical solution temperature type of binary liquid mixture at atmospheric pressure. Mass density measurements have also been carried out to provide additional information related to such experimental finding, which entails an increase of the critical temperature T(c) under an electric field.
authors.affiliation: Laboratorium voor Akoestiek en Thermische Fysica, Departement Natuurkunde en Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200D-bus 2416, B-3001 Leuven, Belgium. jan.leys@fys.kuleuven.be
authors.forename: Jan
authors.initials: J
authors.lastname: Leys
authors.forename: Patricia
authors.initials: P
authors.lastname: Losada-Pérez
authors.forename: Jacobo
authors.initials: J
authors.lastname: Troncoso
authors.forename: Christ
authors.initials: C
authors.lastname: Glorieux
authors.forename: Jan
authors.initials: J
authors.lastname: Thoen