US EPA

1611727 

Journal Article 

The critical behavior of the dielectric constant in the polar plus polar binary liquid mixture nitromethane plus 3-pentanol: An unusual sign of its critical amplitude in the one-phase region 

Leys, Jan; Losada-Perez, P; Troncoso, J; Glorieux, C; Thoen, Jan 

2011 

Yes 

Journal of Chemical Physics
ISSN: 0021-9606
EISSN: 1089-7690 

135 

2 

21766958 

10.1063/1.3607237 

WOS:000292776000043 

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 vertical bar t vertical bar
(2 beta) 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 vertical bar t vertical bar(1-
alpha) 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. (C) 2011
American Institute of Physics. [doi:10.1063/1.3607237] 

critical points; dielectric liquids; liquid mixtures; organic compounds; permittivity