Search results for "Donnan Theory"

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Donnan phenomena in membranes with charge due to ion adsorption. Effects of the interaction between adsorbed charged groups

1993

A physical model for the modified Donnan phenomenon associated with ion adsorption on localized membrane sites is presented. This model accounts for the dependence of the concentration of adsorbed ions on electrolyte concentration and pH as it is influenced by the electrostatic interaction between adsorbed ions. The equilibrium thermodynamic concepts employed are based on the Donnan formalism for the ion equilibria between membrane and solution, and the Bragg–Williams approximation for an adsorption isotherm that incorported interaction between adsorbed ions. Our results include the concentration of charged groups in the membrane, the pH of the membrane phase solution, and the Donnan potent…

General Physics and AstronomyElectrolyteElectric chargeIonQuantitative Biology::Subcellular ProcessesCouplingsymbols.namesakeAdsorptionPhysics::Plasma PhysicsPhase (matter)Donnan Theory ; Membranes ; Electric Charges ; Ions ; Adsorption ; Coupling ; Mathematical ModelsPhysics::Chemical PhysicsPhysical and Theoretical Chemistry:FÍSICA::Química física [UNESCO]IonsConductive polymerDonnan potentialMembranesMathematical ModelsChemistrymusculoskeletal neural and ocular physiologyUNESCO::FÍSICA::Química físicaCondensed Matter::Soft Condensed MatterMembraneChemical physicssymbolsPhysical chemistryDonnan TheoryElectric ChargesAdsorptionThe Journal of Chemical Physics
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Modified Donnan phenomena in polyaniline with poly(vinyl sulphonate) chains

1993

We develop a physical model, based on the modified Donnan phenomena ideas introduced previously by the authors, to describe the acid doping of the conducting polymer polyaniline. The theory is motivated by the experimental work of Asturias et al. [Ber. Bunsenges. Phys. Chem. 95, 1381 (1991)]. Good agreement between theory and experiment is found.

chemistry.chemical_classificationConductive polymerMathematical ModelsChemistryDopingElectric ConductorsModificationsChainsGeneral Physics and AstronomySulfonic acidUNESCO::FÍSICA::Química físicaMathematical Models ; Polyanilines ; Modifications ; Donnan Theory ; Electric Conductors ; Doped Materials ; Chains ; Organic Acidschemistry.chemical_compoundOrganic AcidsChemical engineeringPolyanilinePolymer chemistryDonnan TheoryExperimental workPolyanilinesPhysical and Theoretical ChemistryDoped Materials:FÍSICA::Química física [UNESCO]The Journal of Chemical Physics
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