Modeling of systems with aqueous solutions of UO 2 2+ salts. Asymmetric model of excess thermodynamic functions, based on virial expansion of the Gibbs free energy of the solution, VD-AS

2017 ◽  
Vol 59 (2) ◽  
pp. 134-142 ◽  
Author(s):  
N. A. Charykov ◽  
K. N. Semenov ◽  
A. V. Kurilenko ◽  
V. A. Keskinov ◽  
D. G. Letenko ◽  
...  
Keyword(s):  
Free Energy ◽  
Aqueous Solutions ◽  
Gibbs Free Energy ◽  
Thermodynamic Functions ◽  
Virial Expansion ◽  
Asymmetric Model ◽  
Excess Thermodynamic Functions

scholarly journals Cobalt electrodeposition onto polycrystalline gold from ammoniacal solutions

2013 ◽  
Vol 11 (8) ◽  
pp. 1381-1392 ◽  
Author(s):  
Luis Mendoza-Huizar ◽  
Clara Rios-Reyes
Keyword(s):  
Free Energy ◽  
Aqueous Solutions ◽  
Transfer Coefficient ◽  
Gibbs Free Energy ◽  
Nucleation Rate ◽  
Nucleation Sites ◽  
Linear Voltammetry ◽  
Polycrystalline Gold ◽  
Cobalt Electrodeposition ◽  
Saturation Number

AbstractIn the present work, the cobalt electrodeposition onto polycrystalline gold electrodes from aqueous solutions containing 0.01M CoSO4 + 1 M (NH4)2SO4 at pH=7 was analyzed. Linear voltammetry results suggested a change in the kinetic of the cobalt electrodeposition. In all cases, the nucleation rate (A), the number of active nucleation sites (N 0) and the saturation number of nuclei (N s ) values were potential dependent. The calculated Gibbs free energy (ΔG) for this system was 1.88×10−20 J nuclei−1 and the transfer coefficient for the Hydrogen Electroreduction Reaction (HER) was 0.47.

scholarly journals Heat Capacities and Thermodynamic Properties of Pinnoite and Inderite

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Hanyu Zheng ◽  
Kangrui Sun ◽  
Long Li ◽  
Yafei Guo ◽  
Tianlong Deng
Keyword(s):  
Free Energy ◽  
Phase Transitions ◽  
Thermodynamic Properties ◽  
Gibbs Free Energy ◽  
Thermodynamic Functions ◽  
High Purity ◽  
Heat Capacities ◽  
Thermal Anomalies ◽  
Natural Minerals ◽  
First Time

In this paper, in order to understand the thermodynamic properties of natural minerals of pinnoite (MgB2O4·3H2O, Pin) and inderite (Mg2B6O11·15H2O, Ind) deposited in salt lakes, heat capacities of two minerals were measured using a precision calorimeter at temperatures from 306.15 to 355.15 K after the high purity was synthesized. It was found that there are no phase transitions and thermal anomalies for the two minerals, and the molar heat capacities against temperature for Pin and Ind were fitted as Cp,m,pin = −2029.47058 + 16.94666T − 0.04396T2 + 3.89409×10−5T3 and Cp,m,Ind = −30814.43795 + 282.68108T − 0.85605T2 + 8.70708×10−4T 3, respectively. On the basis of molar heat capacities (Cp,m) of Pin and Ind, the thermodynamic functions of entropy, enthalpy, and Gibbs free energy at the temperature of 1 K interval for the two minerals were obtained for the first time.

scholarly journals Thermal expansivities of aqueous solutions of 2-butoxyethanol in the water-rich region: transition of mixing scheme

1992 ◽  
Vol 70 (10) ◽  
pp. 2659-2663 ◽  
Author(s):  
James V. Davies ◽  
Frankie W. Lau ◽  
Loanne T. N. Le ◽  
John T. W. Lai ◽  
Yoshikata Koga
Keyword(s):  
Free Energy ◽  
Aqueous Solutions ◽  
Gibbs Free Energy ◽  
Rich Region ◽  
Hydrophobic Solute ◽  
Thermal Expansivities ◽  
Mixing Schemes ◽  
Structure Enhancement ◽  
Derivatives Of ◽  
Transition Of Mixing Scheme

Thermal expansivities of aqueous solutions of 2-butoxyethanol (BE) were measured at concentrations of xBE < 0.04, where xBE is the mole fraction of BE. Thermal expansivity is a second derivative of the Gibbs free energy. The composition derivatives of thermal expansivities, the third derivatives, show peak anomalies at the same loci as the other third derivatives of the Gibbs free energy reported earlier from this laboratory (Can. J. Chem. 67, 671 (1989); J. Phys. Chem. 94, 3879 (1990); J. Phys. Chem. 95, 4119 (1991)). The loci of such anomalies form a boundary that separates two regions of totally different mixing schemes. The mixing scheme in the water-rich region seems to be consistent with the "iceberg formation," the "structure enhancement of H2O by hydrophobic solute," and the "hydrophobic attraction." In the intermediate composition region, the hydrogen bond network of H2O collapses due to the presence of too many molecules of BE, and H2O and BE molecules interact with each other as normal liquid molecules.

scholarly journals The Important Thermal Characteristics of Matter and Their Computations with the Use of the Gibbs Potentials

2019 ◽  
Vol 19 (2) ◽  
pp. 134-138
Author(s):  
Y. S. Budzhak ◽  
T. Wacławski
Keyword(s):  
Heat Capacity ◽  
Free Energy ◽  
Specific Heat ◽  
Internal Energy ◽  
Gibbs Free Energy ◽  
Specific Heat Capacity ◽  
Thermodynamic Functions ◽  
Thermodynamic Potential ◽  
Thermal Characteristics ◽  
Dynamic Potential

In this paper, the important thermal characteristics of matter  (they describe thermodynamic systems in a state of thermodynamic equilibrium) were calculated.  There are the following  important thermodynamic functions:   the system   internal energy ,  the thermal function (or enthalpy)   the  free  Helmholtz energy, the thermo-dynamic potential  (or Gibbs free energy), the Gibbs grand thermodynamic potential , the entropy ,  the specific heat capacity . These functions are explicit functions of system’s parameters, they fulfil some mathe-matical relationships  and posses   some total differentials. These  functions  are calculated  in this paper and their physical sense is given in the cited works.

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