The Experts below are selected from a list of 2823 Experts worldwide ranked by ideXlab platform
R. S. Lokhande - One of the best experts on this subject based on the ideXlab platform.
-
Study on ion exchange equilibrium for some uni-univalent and uni-Divalent reaction systems using strongly basic Anion-exchange resin Duolite A-113
Russian Journal of Physical Chemistry A, 2009Co-Authors: R. S. Lokhande, P. U. Singare, M. H. DoleAbstract:The study on thermodynamics of ion exchange equilibrium for uni-univalent Cl−/I−, Cl−/Br−, and uni-Divalent Cl−/SO42−, Cl−/C2O42− reaction systems was carried out using ion-exchange resin Duolite A-113. The equilibrium constant K was calculated by taking into account the activity coefficient of ions both in solution as well as in the resin phase. The K values calculated for uni-univalent and uni-Divalent Anion exchange reaction systems were observed to increase with rise in temperature, indicating the endothermic exchange reactions having enthalpy values of 17.21, 36.60, 19.50, 18.43 kJ/mol respectively.
-
Thermodynamics of ion exchange equilibrium for some uni-univalent and Divalent reaction systems using strongly basic Anion exchange resin Indion FF-IP
Bulletin of the Chemical Society of Ethiopia, 2008Co-Authors: P. U. Singare, R. S. Lokhande, T. S. PrabhavalkarAbstract:The study on thermodynamics of ion exchange equilibrium for uni-univalent Cl - /I - , Cl - /Br - , and uni-Divalent Cl - /SO 4 2- , Cl - /C 2 O 4 2- reaction systems was carried out using ion exchange resin Indion FF-IP. The equilibrium constant K was calculated by taking into account the activity coefficient of ions both in solution as well as in the resin phase. For uni-univalent ion exchange reaction systems, the equilibrium constant K’ were also calculated by considering mole fraction of ions in the resin phase. The K values calculated for uni-univalent and uni-Divalent Anion exchange reaction systems were observed to increase with rise in temperature, indicating the endothermic exchange reactions having enthalpy values of 22.45, 28.57, 17.84, 15.97 kJ/mol, respectively. KEY WORDS: Ion exchange equilibrium, Equilibrium constant in standard state, Apparent equilibrium constant, Enthalpy, Endothermic reaction Bull. Chem. Soc. Ethiop. 2008 , 22(3), 415-421.
-
Ion exchange equilibrium for some uni-univalent and uni-Divalent reaction systems using strongly basic Anion exchange resin Duolite A-102 D
Bulletin of the Chemical Society of Ethiopia, 2008Co-Authors: R. S. Lokhande, P. U. Singare, A. R. KolteAbstract:The study on thermodynamics of ion exchange equilibrium for uni-univalent Cl - /I - , Cl - /Br - , and uni-Divalent Cl - /SO 4 2- , Cl - /C 2 O 4 2- reaction systems was carried out using ion exchange resin Duolite A-102 D. The equilibrium constant K was calculated by taking into account the activity coefficient of ions both in solution as well as in the resin phase. The K values calculated for uni-univalent and uni-Divalent Anion exchange reaction systems was observed to increase with rise in temperature, indicating the endothermic exchange reactions having enthalpy values of 13.7, 38.0, 23.9, 22.9 kJ/mol, respectively. KEY WORDS: Duolite A-102 D ion exchange resin, Equilibrium constant, Endothermic ion exchange reaction, Enthalpy, Thermodynamic study Bull. Chem. Soc. Ethiop. 2008 , 22(1), 107-114.
-
A study of ion exchange equilibrium for some uni-univalent and uni-Divalent reaction systems using strongly basic Anion exchange resin Indion-830 (Type 1)
Russian Journal of Physical Chemistry A, 2007Co-Authors: R. S. Lokhande, P. U. Singare, A. B. PatilAbstract:A study of the thermodynamics of ion exchange equilibrium for uni-univalent Cl−/I−, Cl−/Br− and uni-Divalent Cl−/SO 4 2− , Cl−/C2O 4 2− reaction systems was carried out using ion exchange resin Indion-830 (Type 1). The equilibrium constant K was calculated by taking into account the activity coefficients of ions both in solution and in the resin phase. For uni-univalent ion exchange reaction systems, the equilibrium constants K′ were also calculated from the mole fraction of ions in the resin phase. The K values calculated for uni-univalent and uni-Divalent Anion exchange reaction systems increased as the temperature grew, indicating the endothermic character of the exchange reactions with enthalpies of 38.2, 32.3, 7.6, and 11.4 kJ/mol, respectively.
P. U. Singare - One of the best experts on this subject based on the ideXlab platform.
-
Study on ion exchange equilibrium for some uni-univalent and uni-Divalent reaction systems using strongly basic Anion-exchange resin Duolite A-113
Russian Journal of Physical Chemistry A, 2009Co-Authors: R. S. Lokhande, P. U. Singare, M. H. DoleAbstract:The study on thermodynamics of ion exchange equilibrium for uni-univalent Cl−/I−, Cl−/Br−, and uni-Divalent Cl−/SO42−, Cl−/C2O42− reaction systems was carried out using ion-exchange resin Duolite A-113. The equilibrium constant K was calculated by taking into account the activity coefficient of ions both in solution as well as in the resin phase. The K values calculated for uni-univalent and uni-Divalent Anion exchange reaction systems were observed to increase with rise in temperature, indicating the endothermic exchange reactions having enthalpy values of 17.21, 36.60, 19.50, 18.43 kJ/mol respectively.
-
Thermodynamics of ion exchange equilibrium for some uni-univalent and Divalent reaction systems using strongly basic Anion exchange resin Indion FF-IP
Bulletin of the Chemical Society of Ethiopia, 2008Co-Authors: P. U. Singare, R. S. Lokhande, T. S. PrabhavalkarAbstract:The study on thermodynamics of ion exchange equilibrium for uni-univalent Cl - /I - , Cl - /Br - , and uni-Divalent Cl - /SO 4 2- , Cl - /C 2 O 4 2- reaction systems was carried out using ion exchange resin Indion FF-IP. The equilibrium constant K was calculated by taking into account the activity coefficient of ions both in solution as well as in the resin phase. For uni-univalent ion exchange reaction systems, the equilibrium constant K’ were also calculated by considering mole fraction of ions in the resin phase. The K values calculated for uni-univalent and uni-Divalent Anion exchange reaction systems were observed to increase with rise in temperature, indicating the endothermic exchange reactions having enthalpy values of 22.45, 28.57, 17.84, 15.97 kJ/mol, respectively. KEY WORDS: Ion exchange equilibrium, Equilibrium constant in standard state, Apparent equilibrium constant, Enthalpy, Endothermic reaction Bull. Chem. Soc. Ethiop. 2008 , 22(3), 415-421.
-
Ion exchange equilibrium for some uni-univalent and uni-Divalent reaction systems using strongly basic Anion exchange resin Duolite A-102 D
Bulletin of the Chemical Society of Ethiopia, 2008Co-Authors: R. S. Lokhande, P. U. Singare, A. R. KolteAbstract:The study on thermodynamics of ion exchange equilibrium for uni-univalent Cl - /I - , Cl - /Br - , and uni-Divalent Cl - /SO 4 2- , Cl - /C 2 O 4 2- reaction systems was carried out using ion exchange resin Duolite A-102 D. The equilibrium constant K was calculated by taking into account the activity coefficient of ions both in solution as well as in the resin phase. The K values calculated for uni-univalent and uni-Divalent Anion exchange reaction systems was observed to increase with rise in temperature, indicating the endothermic exchange reactions having enthalpy values of 13.7, 38.0, 23.9, 22.9 kJ/mol, respectively. KEY WORDS: Duolite A-102 D ion exchange resin, Equilibrium constant, Endothermic ion exchange reaction, Enthalpy, Thermodynamic study Bull. Chem. Soc. Ethiop. 2008 , 22(1), 107-114.
-
A study of ion exchange equilibrium for some uni-univalent and uni-Divalent reaction systems using strongly basic Anion exchange resin Indion-830 (Type 1)
Russian Journal of Physical Chemistry A, 2007Co-Authors: R. S. Lokhande, P. U. Singare, A. B. PatilAbstract:A study of the thermodynamics of ion exchange equilibrium for uni-univalent Cl−/I−, Cl−/Br− and uni-Divalent Cl−/SO 4 2− , Cl−/C2O 4 2− reaction systems was carried out using ion exchange resin Indion-830 (Type 1). The equilibrium constant K was calculated by taking into account the activity coefficients of ions both in solution and in the resin phase. For uni-univalent ion exchange reaction systems, the equilibrium constants K′ were also calculated from the mole fraction of ions in the resin phase. The K values calculated for uni-univalent and uni-Divalent Anion exchange reaction systems increased as the temperature grew, indicating the endothermic character of the exchange reactions with enthalpies of 38.2, 32.3, 7.6, and 11.4 kJ/mol, respectively.
Zhengjin Yang - One of the best experts on this subject based on the ideXlab platform.
-
hydrophobic side chains impart Anion exchange membranes with high monovalent Divalent Anion selectivity in electrodialysis
ACS Sustainable Chemistry & Engineering, 2019Co-Authors: Muhammad Irfan, Yaoming Wang, Zhengjin YangAbstract:Developing Anion exchange membranes that have high Anion selectivity and can avoid membrane swelling is a critical, but challenging, target for electrodialysis, which has witnessed great success in...
James M Salhany - One of the best experts on this subject based on the ideXlab platform.
-
slow transitions between two conformational states of band 3 ae1 modulate Divalent Anion transport and dbds binding to a second site on band 3 which is activated by lowering the ph pk approximately 5 0
Blood Cells Molecules and Diseases, 2004Co-Authors: James M SalhanyAbstract:Evidence is emerging which indicates that the Anion transport activity of band 3 may be regulated. I review the molecular basis for regulation of the Anion transport function of band 3 in terms of evidence showing that Divalent Anion transport involves a slow "hysteretic" transition between two functional states, mediated by interactions between subunits within band 3 oligomers. In addition, I briefly describe recent work from my laboratory where we have discovered a novel manifestation of slow conformational changes in band 3. This involves 4,4'-dibenzamido-2,2'-stilbenedisulfonate (DBDS) binding to a second, proton-activated site distinct from the primary stilbenedisulfonate site. This site is exposed on the outer aspect of band 3 when the pH is lowered (pK approximately 5.0). This is the same pK as the protonation site on band 3 involved in Divalent Anion-proton co-transport (APCT) [J. Gen. Physiol. 79 (1982) 87]. Significantly, we have found that DBDS binding to this proton-activated site has unusually slow kinetics, and increasing DBDS concentration causes a decrease in the apparent pseudo-first-order rate constant. These results suggest that a slow conformational pre-equilibrium is the rate limiting step in DBDS binding to the proton-activated site on band 3 observed at low pH. Our results support an allosteric two-state model for regulation of Divalent Anion transport by band 3 oligomers involving a slow conformational transition and interactions between subunits [Biochemistry 31 (1992) 7301].
Dmitri Y. Petrovykh - One of the best experts on this subject based on the ideXlab platform.
-
Divalent Anion salt effects in polyelectrolyte multilayer depositions
Langmuir, 2012Co-Authors: Walter J. Dressick, Kathryn J. Wahl, Nabil D. Bassim, Rhonda M. Stroud, Dmitri Y. PetrovykhAbstract:We systematically investigate the effects of Divalent Anions on the assembly of polyelectrolyte multilayers by fabricating polystyrene sulfonate (PSS)/polyallylamine hydrochloride (PAH) multilayer films from aqueous solutions containing SO(4)(2-), HPO(4)(2-), or organic dicarboxylate diAnions. The chosen concentrations of these Anions (i.e., ≤0.05 M) allow us to isolate their effects on the assembly process from those of the polyelectrolyte solubility or solution ionic strength (maintained constant at μ = 1.00 M by added NaCl). Compared to a control film prepared from solutions containing only Cl(-) Anions, stratified multilayers deposited in the presence of diAnions exhibit increased UV absorbance, thickness, and roughness. From the dependence of film properties on the solution concentration of SO(4)(2-) and number of polyelectrolyte layers deposited, we derive a generic model for the PSS/PAH multilayer formation that involves adsorption of PAH aggregates formed in solution via electrostatic interactions of PAH with bridging diAnions. Experiments using HPO(4)(2-) and organic dicarboxylate species of varying structure indicate that the separation, rigidity, and angle between the discrete negatively charged sites in the diAnion govern the formation of the PAH aggregates, and therefore also the properties of the multilayer film. A universal linear relationship between film UV absorbance and thickness is observed among all diAnion types or concentrations, consistent with the model.
-
Divalent–Anion Salt Effects in Polyelectrolyte Multilayer Depositions
2012Co-Authors: Walter J. Dressick, Kathryn J. Wahl, Nabil D. Bassim, Rhonda M. Stroud, Dmitri Y. PetrovykhAbstract:We systematically investigate the effects of Divalent Anions on the assembly of polyelectrolyte multilayers by fabricating polystyrene sulfonate (PSS)/polyallylamine hydrochloride (PAH) multilayer films from aqueous solutions containing SO42–, HPO42–, or organic dicarboxylate diAnions. The chosen concentrations of these Anions (i.e., ≤0.05 M) allow us to isolate their effects on the assembly process from those of the polyelectrolyte solubility or solution ionic strength (maintained constant at μ = 1.00 M by added NaCl). Compared to a control film prepared from solutions containing only Cl– Anions, stratified multilayers deposited in the presence of diAnions exhibit increased UV absorbance, thickness, and roughness. From the dependence of film properties on the solution concentration of SO42– and number of polyelectrolyte layers deposited, we derive a generic model for the PSS/PAH multilayer formation that involves adsorption of PAH aggregates formed in solution via electrostatic interactions of PAH with bridging diAnions. Experiments using HPO42– and organic dicarboxylate species of varying structure indicate that the separation, rigidity, and angle between the discrete negatively charged sites in the diAnion govern the formation of the PAH aggregates, and therefore also the properties of the multilayer film. A universal linear relationship between film UV absorbance and thickness is observed among all diAnion types or concentrations, consistent with the model