Thermodynamic properties and structure of the water–ethanol silicone oil interface

1987 ◽  
Vol 65 (9) ◽  
pp. 2299-2304 ◽  
Author(s):  
Dominique Sohounhloue ◽  
Louis Tenebre ◽  
Mireille Privat ◽  
Jean-Marc Douillard ◽  
René Bennes ◽  
...  
Keyword(s):  
Adsorption Isotherm ◽  
Thermodynamic Properties ◽  
Activity Coefficients ◽  
Composition Range ◽  
Surface Composition ◽  
Silicone Oil ◽  
Adsorbed Layer ◽  
Aqueous Mixtures ◽  
Surface Excess

The interface between the water (1) – ethanol (2) system and silicone oil was studied over the whole composition range of the aqueous mixtures by means of adsorption and ellipticity measurements. The adsorbed layer was treated as a phase and, after derelativization of the relative surface excess, the adsorption isotherm (in term of molar fractions) as well as the activity coefficients of water and ethanol were calculated. From the above results and by analysing the ellipticity coefficient, we calculated the contribution to this latter due to the anisotropy of the adsorbed layer; the resulting "polynomial of anisotropy" was analyzed as a consequence of water and ethanol reorientations as the surface composition is changed.

Activity Coefficients of NaCl in Aqueous Mixtures with High Relative Permittivity Cosolvent: Ethylene Carbonate + Water at 298.15 K

2010 ◽  
Vol 55 (9) ◽  
pp. 3349-3355 ◽  
Author(s):  
Felipe Hernández-Luis ◽  
Raquel Rodríguez-Raposo ◽  
Héctor R. Galleguillos ◽  
Jaime W. Morales
Keyword(s):  
Activity Coefficients ◽  
Relative Permittivity ◽  
Ethylene Carbonate ◽  
Aqueous Mixtures ◽  
Carbonate Water ◽  
High Relative Permittivity

Determination of thermodynamic properties of aqueous mixtures of RbCl and Rb2SO4 by the EMF method at T=298.15 K

2003 ◽  
Vol 35 (8) ◽  
pp. 1383-1392 ◽  
Author(s):  
Zhang-Jun ◽  
Gao Shi-Yang ◽  
Xia Shu-Ping
Keyword(s):  
Thermodynamic Properties ◽  
Emf Method ◽  
Aqueous Mixtures

Heat capacities and volumes in aqueous polymer and polymer–surfactant solutions

1987 ◽  
Vol 65 (5) ◽  
pp. 990-995 ◽  
Author(s):  
Gérald Perron ◽  
Josée Francoeur ◽  
Jacques E. Desnoyers ◽  
Jan C. T. Kwak
Keyword(s):  
Thermodynamic Properties ◽  
Chain Length ◽  
Polymer Concentration ◽  
Heat Capacities ◽  
Aqueous Mixtures ◽  
Alkyltrimethylammonium Bromides ◽  
Aqueous Polymer ◽  
Surfactant Interactions ◽  
Polymer Surfactant ◽  
Polymer Interaction

The apparent molar volumes and heat capacities of aqueous mixtures of neutral polymers and ionic surfactants were measured at 25 °C. The polymers chosen were poly(vinylpyrrolidone) (PVP) and poly(ethyleneoxide) (PEO) and the surfactants were the C8, C10, and C12 homologs of sodium alkylsulfates and the C10, C12, and C16 homologs of alkyltrimethylammonium bromides. The polymer–surfactant interactions depend on the nature of both components and on the chain length of the surfactant. The thermodynamic properties of the cationic surfactants are essentially the same in the absence and presence of polymer indicating little surfactant–polymer interaction. On the other hand, the thermodynamic properties of anionic surfactants are shifted, upon the addition of polymers, in the direction of enhanced hydrophobic association. The effect increases with the surfactant chain length and with the polymer concentration. The effect is larger with PVP than with PEO.

Thermodynamic properties of the binary molten salt systems, PbBr2-KBr, PbBr2-RbBr and PbBr2-CsBr, by measurement of the electromotive forces of galvanic cells

1981 ◽  
Vol 34 (3) ◽  
pp. 479 ◽  
Author(s):  
H Bloom ◽  
MS White
Keyword(s):  
Thermodynamic Properties ◽  
Molten Salt ◽  
Activity Coefficients ◽  
Molten Salts ◽  
Free Energies ◽  
Complex Ions ◽  
Galvanic Cells ◽  
Salt Systems

The electromotive forces of galvanic cells for the formation of PbBr2 in the molten binary salt systems, PbBr2-KBr, PbBr2,-RbBr and PbBr2-CsBr, have been measured. Activities, activity coefficients and partial molar free energies have been calculated for each component of the three systems. Integral free energies of mixing have also been calculated. Various models of mixing of molten salts have been applied to the results. The systems contain complex ions, probably mixtures of PbBr42-, PbBr64- with some PbBr3-.

Calculation on the Free Energy of Mixing of some Silane Systems

2011 ◽  
Vol 391-392 ◽  
pp. 1017-1021
Author(s):  
Ru Zhang ◽  
Yan Fen Wu ◽  
Ping Hu
Keyword(s):  
Free Energy ◽  
Thermodynamic Properties ◽  
Activity Coefficients ◽  
Influence Factors ◽  
Critical Parameters ◽  
Model Parameters ◽  
Free Energies ◽  
Wilson Model ◽  
Energy Of Mixing ◽  
Free Energy Of Mixing

Six binary silane systems were chosen to calculate the activity coefficients (γ) and free energies of mixing (ΔGm). These systems included: methyldichlorosilane + methyltrichlorosilane, methyldichlorosilane + methylvinyldichlorosilane, methyldichlorosilane + toluene, methyltrichlorosilane + methylvinyldichlorosilane, methyltrichlorosilane + toluene, methylvinyldichlorosilane + toluene. Based on the Antoine constants, critical parameters of the pure components and Wilson model parameters, γ and ΔGmwere calculated. The influence factors of these thermodynamic properties were also discussed.

Research on Thermodynamic Properties of Bioleaching Solution in Lean Nickel-Cobalt Ore by Pitzer - Meissner Model

2015 ◽  
Vol 1092-1093 ◽  
pp. 1455-1459
Author(s):  
Chu Yue Hou ◽  
Gui Ying Zhou ◽  
Jian Kang Wen ◽  
Biao Wu
Keyword(s):  
Thermodynamic Properties ◽  
Activity Coefficient ◽  
Aqueous Solutions ◽  
Activity Coefficients ◽  
Pitzer Model ◽  
Foreign Ions ◽  
Nickel Cobalt

In this paper, we jointly use the Pitzer model and the Meissner model to study thermodynamic laws of bioleaching solution in a lean nickel-cobalt ore in the Jilin Baishan, by using the Pitzer model to calculate activity coefficients of single electrolyte aqueous solutions and the Meissner model to calculate activity coefficients of components in the bioleaching solution. Also we studied the rules of activity coefficient of NiSO4 and CoSO4 in the solution. Results show that when separating and purifying foreign ions from bioleaching solution of the lean nickel-cobalt ore, the descending sequence of their ion concentration’s effect over the solution is Mg2+, Fe3+, Fe2+, Ni2+, Co2+ and Ca2+.

Thermodynamic properties of aqueous mixtures of LiCl and Li2SO4 at different temperatures

1995 ◽  
Vol 45 (1-2) ◽  
pp. 117-130 ◽  
Author(s):  
Yan Yao ◽  
Ruiling Wang ◽  
Xucun Ma ◽  
Pengsheng Song
Keyword(s):  
Thermodynamic Properties ◽  
Aqueous Mixtures ◽  
Different Temperatures
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