Static Relative Permittivities of Water + Propane-1,2-diol and Water + Propane-1,3-diol under Pressures up to 300 MPa at 298.15 K

Abstract

Static relative permittivities ( r ) of water + propane-1,2-diol and water + propane-1,3-diol were measured at four mole fractions under pressures up to 300 MPa at 298.15 K. A Tait-type equation was used to represent r with pressure (P) for each composition. Values of (∂ ln r /∂P) T and r -2 (∂ r /∂P) T at 0.1 MPa for both aqueous propanediol systems were determined by use of the static relative permittivity at 0.1 MPa, r (0.1 MPa), and the Tait-type parameters, A and B. Values of (∂ ln r /∂P) T and the isothermal compressibility (κ T ) at 0.1 MPa over the entire composition range are compared for both aqueous propanediol systems. A relationship between (∂ ln r /∂P) T and κ T at 0.1 MPa was derived from the density dependence of r . Furthermore, composition dependence of r -2 (∂ r /∂P) T at 0.1 MPa was examined for the present systems.

Electrostriction of Several Nonaqueous Solvents under Ambient Conditions and Solvation Numbers of Ions in Them

“…This is not necessarily the case for the pressure dependence of the static permittivity of the solvents dealt with here. The data of Uosaki et al 9,10 and Kiselev et al, 13 among others, were also described by a Tait-like expression…”

“… a ref . b ref . c ref . d ref . e ref . f ref . g ref . h ref . i ref . j ref . k ref . l ref . m ref . n ref . o ref . p ref . q ref . r ref . s ref . …”

“…The pressure-dependent permittivity and density data for 2,2,2-trifluoroethanol were obtained from Tanaka et al and fitted as above. The pressure-dependent permittivity data for the propanediols and glycerol were obtained from Uosaki et al , and fitted similarly. The pressure-dependent density data for the polyols were obtained from Zorebski et al for the propanediols (κ T ( P ) T values) and Egorov and Makarov for glycerol (compression data, k ( P ), where k = [ρ­( P ) – ρ­(0.1 MPa)]/ρ­(0.1 MPa)), fitted as above.…”

“…This is not necessarily the case for the pressure dependence of the static permittivity of the solvents dealt with here. The data of Uosaki et al , and Kiselev et al, among others, were also described by a Tait-like expression yielding the approximate pressure-independent first derivative (∂ ln ε­( T , P )/∂ P ) T ≈ C / B ( T ). However, the second derivative had to be determined from a numerical presentation of the data in the form of a quadratic expression, ε­( P ) T , that could be fitted for most of the solvents, with a squared correlation coefficient >0.999.…”

Concentration and Medium Micellar Kinetic Effects Caused by Morphological Transitions

“…The addition of 1,2-prop results in a substantial decrease in the polarity of the bulk phase and in an increment in the polarity of the interfacial region. That is, the bulk phase is a better solvent for the MNS molecules and the affinity of the organic substrate for the interfacial region decreases.…”