Topic
Standard molar entropy
About: Standard molar entropy is a research topic. Over the lifetime, 1586 publications have been published within this topic receiving 29886 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, N-alkylpyridinium bis(trifluoromethylsulfonyl)imide ([Cnpy][NTf2], n = 3, 6] and [C3py] were synthesized and the melting and glass transition temperatures of the two ILs were determined according to the differential scanning calorimetry (DSC).
Abstract: Air- and water-stable hydrophobic ionic liquids N-alkylpyridinium bis(trifluoromethylsulfonyl)imide ([Cnpy][NTf2], n = 3, 6) were synthesized The density, surface tension, dynamic viscosity, and electrical conductivity of [C6py][NTf2] were measured in the range of T = (28315 to 33815) K The density, dynamic viscosity, and electrical conductivity of [C3py][NTf2] were measured in the range of T = (30815 to 33815) K The melting and glass transition temperatures of the two ILs were determined according to the differential scanning calorimetry (DSC) The physicochemical properties, including molecular volume, standard molar entropy, lattice energy, parachor, molar enthalpy of vaporization, interstice volume, interstice fraction, and thermal expansion coefficient, were estimated in terms of empirical and semiempirical equations, as well as the interstice model theory on the base of the experimental values The dynamic viscosity and electrical conductivity values were fitted by Vogel–Fulcher–Tammann (VFT)
78 citations
TL;DR: In this article, the thermodynamic properties of Ca-Bi alloys were determined by electromotive force (emf) measurements to assess the suitability of Ca−Bi electrodes for electrochemical energy storage applications.
78 citations
TL;DR: In this paper, the surface activity of tetrabutylammonium iodide halides at the air/aqueous solution interface or at the hexane-aqueous interface has been studied.
Abstract: The surface activity of the tetrabutylammonium halides at the air/aqueous solution interface or at the hexane/aqueous solution interface has been studied. The surface or inter facial tension versus the concentration curves of the electrolytes are markedly dependent on the kind of their counter-ions, just as with these electrolytes in aqueous solutions. The surface activity of tetrabutylammonium iodide is fairly strong; it approximately corresponds to that of the surface-active straight-chain electrolyte with an octyl group. From the thermodynamic parameters of the adsorption of tetrabutylammonium iodide, it is found that the standard free energy of adsorption becomes negative as a result of the large positive values of the standard entropy of adsorption, irrespective of the positive values of the standard enthalpy change. This suggests that the adsorption is a “hydrophobic” effect; that is, the “icebergs” around the nonpolar groups of the electrolyte return to the original water by the process of the tran...
76 citations
TL;DR: In this article, a thermodynamic study of the UO2-oxygen system, primarily in the single phase region UO 2−UO2, has been made at temperatures of 1150° to 1350°K, where an electrochemical technique was used to obtain emf measurements on uranium oxide halfcells.
Abstract: A thermodynamic study of the uranium‐oxygen system, primarily in the single phase region UO2–UO2.20, has been made at temperatures of 1150° to 1350°K. An electrochemical technique was used to obtain emf measurements on uranium oxide half‐cells. The cells were of the type Fe, FeO|(ZrO2+CaO)|UO2+x, Pt where x varied from 0.01 to 0.20.Partial molar free energies, entropies, and enthalpies of solution of oxygen in UO2+x were calculated. The partial molar free energy is a linear function of temperature at constant composition. The partial molar entropy increases negatively with increasing oxygen content.Equations relating the thermodynamic quantities to the degree of nonstoichiometry have been developed on the assumption that the UO2+x region can be treated as an interstitial solution of oxygen ions in the UO2 fluorite lattice. Semiquantitative agreement with the data was obtained.
76 citations
TL;DR: In this article, Gschneider et al. calculated the heat capacity of rare earth hydroxides from low-temperature heat capacity measurements and derived the entropy and enthalpy of formation.
75 citations