1977
DOI: 10.1021/ja00460a009
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Volumes and heat capacities of ternary aqueous systems at 25.degree.C. Mixtures of urea, tert-butyl alcohol, dimethylformamide, and water

Abstract: The densities and heat capacities per unit volume were measured for the systems urea (U)-/er/-butyl alcohol (TBA)water (W) and dimethylformamide (DMF)-TBA-W at 25 °C with a flow densimeter and a flow microcalorimeter. One of the nonaqueous components was kept at a constant low concentration and whenever possible the other component was varied over the whole mole fraction range. From these data, combined with previously published data on NaCl-U-W and on Bu4NBr-U-W, volumes and heat capacities of transfer were c… Show more

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Cited by 149 publications
(79 citation statements)
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“…This explains why h,, has a sign different from AHoE(W + D) since this latter function is reflecting differences in solute-solvent interactions. A general discussion of these structural interactions is given elsewhere (18). The signs of all the pair parameters can be explained with this approach.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…This explains why h,, has a sign different from AHoE(W + D) since this latter function is reflecting differences in solute-solvent interactions. A general discussion of these structural interactions is given elsewhere (18). The signs of all the pair parameters can be explained with this approach.…”
Section: Discussionmentioning
confidence: 99%
“…In the first instance standard enthalpies of transfer are calculated from the standard enthalpies of solution of the solute in the binary mixture and in pure water; For volumes and constant pressure heat capacities the parameters are given by the apparent molal quantities at low mN in the ternary and binary systems (17,18); Or the emf a using a ion glass The pair interaction parameters are related to cathode and a silver -silver halide anode as described in the usual way. Assuming cNE to be indePOintud (7).…”
Section: Theoretical Relationsmentioning
confidence: 99%
“…52 According to the structural hydration co-sphere model established by Desnoyer and his co-workers, the overall influence of the solute on the structure of water molecules is represented by a spherical shell and the concentration effect by the overlapping of two such co-spheres. [53][54][55] For the electrostatic interaction between hydrophilic protonated amino groups and carboxyl groups, the values of enthalpy (ǻH 1 ), entropy (ǻS 1 ) and free energy (ǻG 1 ) are negative. This spontaneous process was supported by enthalpy.…”
Section: In Vitro Degradation Behaviors Of the Hydrogelsmentioning
confidence: 99%
“…Hence, the apparent molal volume of the sugar in water +VS is given by where Ms is the molecular weight of the sugar and p and po the densities (g ~m -~) of the solution of molality ms and of pure water, respectively. One may also define the apparent molal volume of the sugar S in a solution of electrolyte of molality mE by using the densities p(ms, m~) and p(mE) (15). At low ms concentrations, the transfer function +vs(ms, mi) -+vs(ms) may be assumed to be a standard value (infinite dilution) and we may write Similarly, by considering the transfer of the electrolyte from water to the sugar solutions we get…”
Section: Theoretical Relationsmentioning
confidence: 99%