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Thermodynamics
Items for "Thermodynamics"
Thermodynamic study of metal silicate complexation in perchlorate media
The thermodynamic parameters of formation of the o-silicate complexes of UO22+, Cm3+ and Eu3+ have been measured in the temperature range 5−45 °C in an aqueous medium of 0.20 M NaClO4) ionic strength...
Keywords: Thermodynamics, Silicate, Complexation, Stability constant, Solvent extraction
02/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagStudy on Association of Substituted Benzoic Acids and other Acids by Physical Methods. Effect of Temperature and Structure of Acids on Association Process
This study aims at investigating the possibility of association of twelve aliphatic and substituted benzoic acids by physical methods, namely the UV, IR spectra, melting point and distribution method...
Keywords: Acids, Association, Thermodynamics, Ion-Induced Dipole, Hydrogen Bonding Attractions
12/2005 | Zeitschrift für Physikalische Chemie, Oldenbourg WissenschaftsverlagExtraction of actinides using N, N, N′, N′-tetraoctyl diglycolamide (TODGA): a thermodynamic study
The effect of temperature on the extraction behaviour of Am(III), Pu(IV) and U(VI) from nitric acid medium was studied employing N,N,N′,N′-tetraoctyl diglycolamide (TODGA) in n-dodecane...
Keywords: TODGA, Actinides, Thermodynamics, Extraction constant
06/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagStudies on sorption of cadmium (II) ions onto Haro river sand from aqueous media using radiotracer and voltammetric techniques
Sorption of Cd(II) ions on Haro river sand has been studied using radiotracer technique. The effects of pH and acid concentrations on the sorption were studied...
Keywords: Cd(II), Adsorption, Kinetics, Thermodynamics, River sand
08/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagPreferential Solvation Effects on the Kinetics and Thermodynamics of Oxidation of Anilines by Chromium(VI)
The imidazolium fluorochromate (IFC) oxidation of fifteen meta - and para-substituted anilines, in varying mole fractions of benzene in 2-methylpropan-2-ol as mixtures, in the presence of p-toluenesulfonic acid (TsOH) is first order in IFC and TsOH and zero order in substrate...
Keywords: Anilines, Chromium(VI), Kinetics, Thermodynamics, Oxidation
06/2006 | Zeitschrift für Physikalische Chemie, Oldenbourg WissenschaftsverlagNp(V)O2+ sorption on hydroxyapatite-effect of calcium and phosphate anions
The sorption of NpO2+ from aqueous solution on hydroxyapatite was studied as a function of the amount of sorbent, initial NpO2+ concentration, ionic strength and pcH...
Keywords: NpO2+, Sorption, Hydroxyapatite, Kinetics, Thermodynamics
09/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagContribution to the Thermodynamics of Complexes of Alkali Metal Cations with Benzo-18-Crown-6 in the Water–Nitrobenzene Extraction System
From extraction experiments and γ-activity measurements, the exchange extraction constants corresponding to the general equilibrium M+(aq) + NaL+(nb) ⇔ ML+(nb) + Na+(aq) taking place in the two–phase water–nitrobenzene system (M+ = Li+, K+, Rb+, Cs+; L = benzo-18-crown-6; aq = aqueous phase, nb = nitrobenzene phase) were evaluated...
Keywords: Thermodynamics, Alkali Metal Cations, Crown Compound, Extraction and Stability Constants, Water–Nitrobenzene System
09/2006 | Zeitschrift für Physikalische Chemie, Oldenbourg WissenschaftsverlagEnthalpies of Solution of Organic Solutes in the Ionic Liquids [Me3BuN][NTf2] and [EMIM][EtSO4]
Partial molar enthalpies of solution of 11 systems [Me3BuN][NTf2] + methanol, + ethanol, + 1-propanol, + 1-butanol, + benzene and [EMIM][EtSO4] + methanol, + ethanol, + 1-propanol, + 1-butanol, + CHCl3, + H2O have been measured at 298.15 K in the mole fraction range 1% to 25% of the solutes using a precision titration calorimeter (Thermal Activity Monitor 2277, Thermometrics)...
Keywords: Ionic Liquids, Partial Molar Enthalpies, Titration Calorimetry, Thermodynamics
10/2006 | Zeitschrift für Physikalische Chemie, Oldenbourg WissenschaftsverlagSorption behavior of curium(III) on hydrous silica: a kinetic and thermodynamic study
Sorption of tracer curium, Cm3+, on SiO2· H2O (silica gel) was investigated under different experimental conditions such as time of equilibration, concentration of Sm3+, pcH, and temperature...
Keywords: Curium, Sorption, Silica, Kinetics, Thermodynamics
03/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagEnthalpy measurement using calorimetry shows a significant difference in potential energy between the active and latent conformations of PAI-1
A central feature of the serpin inhibition mechanism is insertion of the reactive center loop into the central ?-sheet (?-sheet A)...
Keywords: plasminogen activator inhibitor, protein folding, Thermodynamics
02/2005 | Biological Chemistry, Walter de GruyterRole of the N-terminal region and of ?-sheet residue Thr29 on the activity of the ?2 global regulator from the broad-host range Streptococcus pyogenes plasmid pSM19035
The dimeric regulatory protein wild-type ? (wt ?2) binds to arrays of 7-bp sequences (heptads) present in the operator DNA region of copy control and partition functions of plasmid pSM19035...
Keywords: MetJ/Arc superfamily, protein-DNA interaction, protein folding, Thermodynamics, transcriptional repressor
09/2005 | Biological Chemistry, Walter de GruyterKinetics and thermodynamics of uranium(VI) sorption on hydrous silica
Sorption of uranyl ion, UO22+, on SiO2· x H2O (silica gel) has been investigated as a function of time, amount of silica gel (0.10–0.60 g), uranium concentration (5.00×10-5–1.00×-3 M), ionic strength (0.20–1.40 M NaClO4), pH (∼2.0–6.0), and temperature (283–333 K)...
Keywords: Kinetics, Thermodynamics, Uranium, Sorption, Silica
09/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagKinetics and electrochemical studies of uranium in acetate and formate media by cyclic voltammetry
The cyclic voltammetric behavior of uranyl ion was investigated at hanging mercury drop electrode in perchlorate supporting electrolyte...
Keywords: Uranium, Acetate, Formate, Kinetics, Thermodynamics
12/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSolvent extraction studies of Pu(IV) with CMPO in 1-octyl 3-methyl imidazolium hexa fluorophosphate (C8mimPF6) room temperature ionic liquid (RTIL)
Solvent extraction studies of Pu(IV) from aqueous nitric acid by carbamoyl methyl phosphine oxide (CMPO) in 1-octyl 3-methyl imidazolium hexa fluorophosphate (C8mimPF6) room temperature ionic liquid (RTIL) were carried out...
Keywords: Solvent extraction, Thermodynamics, Plutonium(IV), C8 mimPF6, RTIL
02/2008 | Radiochimica Acta, Oldenbourg Wissenschaftsverlag