Partial Molar Free Energy

2011 ◽  
pp. 913-913
Author(s):  
Jan W. Gooch
Keyword(s):  
Free Energy ◽  
Partial Molar Free Energy ◽  
Molar Free Energy

THE THERMODYNAMIC PROPERTIES AND PHASE DIAGRAM OF THE GOLD–CADMIUM SYSTEM BY THE ISOPIESTIC METHOD

1965 ◽  
Vol 43 (8) ◽  
pp. 2319-2327 ◽  
Author(s):  
L. J. Bartha ◽  
W. A. Alexander
Keyword(s):  
Phase Diagram ◽  
Free Energy ◽  
Phase Region ◽  
Isopiestic Method ◽  
Partial Molar Free Energy ◽  
Gold Alloys ◽  
Heat Of Solution ◽  
Molar Free Energy ◽  
Phase Boundaries ◽  
Two Phase

Activities of cadmium in gold alloys with up to 50 atom % Cd have been determined by an isopiestic method. The partial molar free energy, entropy, and heat of solution in the alpha and beta phases are calculated between 500 and 600 °C. The phase boundaries have been observed between 16 and 60 atom % above 400 °C. The boundaries of the two-phase regions α2 + β and β + δ′ are found at somewhat different concentrations than before, but the two-phase region α + α2 was not observed.

Determination of Thermodynamic Properties of Poly(4-tert-Butylstyrene) by Inverse Gas Chromatography

1999 ◽  
Vol 19 (3) ◽  
pp. 197-208 ◽  
Author(s):  
İsmet Kaya ◽  
Hasan Mart
Keyword(s):  
Gas Chromatography ◽  
Free Energy ◽  
Infinite Dilution ◽  
Inverse Gas Chromatography ◽  
Solubility Parameters ◽  
Heat Of Mixing ◽  
Thermodynamic Quantities ◽  
Partial Molar Free Energy ◽  
Molar Free Energy ◽  
Adsorption Enthalpy

Abstract Some thermodynamic quantities were obtained for the interactions of poly (4-tert-butylstyrene) with alcohols, ketones, acetates, aromatics and alkanes by the inverse gas chromatography method in the temperature range of 343-463 K. The specific retention volumes (Vg°), the adsorption enthalpy of probes (ΔH2), the partial molar free energy of sorption (ΔG1S), the enthalpy of sorption (ΔH1S), the entropy of sorption (ΔS1S), the weight fraction activity coefficients of solute probes at infinite dilution (Ω1∞), and the Flory- Huggins thermodynamic interaction parameters (χ∞12) between polymer and solvents are given. The partial molar free energy (ΔG1∞, the partial molar heat of mixing (ΔH1∞ at infinite dilution and the solubility parameters of the polymer (δ2) were calculated. The solubility parameter of poly (4-tert-butyl- styrene) was determined from either the slope or intercept as 7.25 (cal/cm3)0,5 and 7.00 (cal/cm3)0,5 at 180°C, respectively.

scholarly journals Thermodynamics of soil moisture.

1960 ◽  
Vol 8 (1) ◽  
pp. 57-78 ◽  
Author(s):  
G.H. Bolt ◽  
M.J. Frissel
Keyword(s):  
Free Energy ◽  
Soil Moisture ◽  
Special Reference ◽  
Experimental Determination ◽  
Freezing Point ◽  
Partial Molar Free Energy ◽  
Freezing Point Depression ◽  
Molar Free Energy

The various equations used by several authors to express the partial molar free energy of soil moisture as a function of certain parameters were compared with a "parent" equation derived in this paper; certain basic differences of approach apparently lead to results which are identical only under certain conditions; from the parent equation, equations with practical applicability are derived. The methods available for the experimental determination of the partial molar free energy of soil moisture are reviewed with special reference to the assumptions underlying the application of the freezing-point depression of soil moisture. (Abstract retrieved from CAB Abstracts by CABI’s permission)

Investigations of the Reversion of Vulcanized Rubber under Heat

1952 ◽  
Vol 25 (2) ◽  
pp. 241-250 ◽  
Author(s):  
Uma Shankar
Keyword(s):  
Free Energy ◽  
Hydrogen Sulfide ◽  
Methyl Iodide ◽  
Energy Of Activation ◽  
Cross Linking ◽  
Molar Free Energy ◽  
Vulcanized Rubber ◽  
Free Energy Of Activation ◽  
Equilibrium Swelling ◽  
Free Sulfur

Abstract (1) During reversion of a vulcanizate, the breakdown of cross-linkages, including those of polysulfides, predominates over any simultaneous reformation of cross-linkages. (2) The reverting modulus falls exponentially with time. (3) The calculated molar free energy of activation is 33.3 ± 1.7 kcal., irrespective of the temperature or the atmosphere of cure or the composition of the mix, and is sufficient to rupture an —S—S— bond. (4) The degree of cross-linking, estimated from the equilibrium swelling measurements in benzene, falls during reversion. (5) The exclusion of oxygen during curing does not prevent reversion if the temperature is high enough to supply the energy needed to break up the cross-linkages. (6) During reversion in nitrogen, hydrogen sulfide is freely evolved, and the C/H ratio rises above the value for C5H8. (7) Evidence for the formation and breakdown of polysulfides during reversion is provided by an increase in free sulfur and a decrease in combined sulfur during a given cure, and the methyl iodide reaction of the reverted vulcanizates.

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