Interfacial electrochemistry of silver iodide

Bijsterbosch, B.H.; Lyklema, J.

doi:10.1016/0001-8686(87)80005-2

Cited by 96 publications

(29 citation statements)

References 158 publications

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“…[12] and [13] we note that at low surface coverages, thus also low ApA values, the electrical term makes the major contribution to the value of A T. When the surface is nearly saturated (o--O-max), the "chemical" term provides the major contribution. Under these conditions (near adsorption saturation) tP0 will be approximately constant and according to Eqs.…”

Section: Lowering Of the Interfacial Tension By Adsorption At A Planamentioning

confidence: 74%

Thermodynamic stabilization of colloids

Stol¹,

DeBruyn²

1980

Journal of Colloid and Interface Science

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An analysis is given of the conditions necessary for obtaining a thermodynamically stable dispersion (TSD) of solid particles in a continuous aqueous solution phase. The role of the adsorption of potential-determining ions at the planar interface in lowering the interfacial free energy (3') to promote spontaneous dispersion is stressed. In this respect the importance of the point-of-zerocharge (PZC) and of the point-of-zero-surface tension (PZS) in the quantitative description of the dispersion process are discussed. It is reasoned that for simple inorganic solids a decrease in 3" by about 200 mN m -1 relative to its value at the PZC may be sufficient to yield a TSD. The equilibrium dispersion will be characterized by a very small but positive 3" and a near isodispersity. Suggestions are made for preparing by precipitation dispersions which may prove to be thermodynamically stable. The differences and similarities between these dispersions and the well-known kinetically stabilized sols of lyophobic colloids are briefly enumerated and discussed.

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Section: Lowering Of the Interfacial Tension By Adsorption At A Planamentioning

confidence: 74%

Thermodynamic stabilization of colloids

Stol¹,

DeBruyn²

1980

Journal of Colloid and Interface Science

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“…Also formally, this separation can be extended to the right hand side of [2]. Assuming a and d to be equal for the two components, we can write i which is equivalent with a splitting-up of the reciprocal Stern permittivity E' according to…”

Section: Interfacial Dipole Potentials In First Ordermentioning

confidence: 99%

“…The model to be not the charge on the surface is localized, while in developed will be applied to the silver iodideaddition solid surfaces are often heterogeneous. ~t aqueous solution interface (2) and incorporated in a follows that the state of hydration, or, for that theory of the AgI-electrolyte interface, which is based matter, the interfacial polarization, varies along the On the individual adsorptions of the potential detersurface. For instance, with negatively charged mining (pad.)…”

Section: Introductionmentioning

confidence: 99%

“…First, it is noted that in [2], E' applies over the entire region between the centres of the surface charges I and the OHP, whereas in [l] cH applies only to a monolayer of water molecules. Strictly speaking cH I could well be unity, but we have to account for the approximation made above that for p the value of I isolated water dipoles has been substituted.…”

mentioning

confidence: 99%

“…The potentials A+(Stern), A+(dip), A+(solid), and A+(diff) follow from [2], [14] pC/cm2 respectively and if the ratio kA,+/kl-amounts to 2.75. The agreement between the two curves is illustrated in Fig.…”

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confidence: 99%

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Patchwise interfacial dipole layers on solids. Application to the silver iodide – aqueous solution interface

Keizer¹,

Lyklema²

1981

Can. J. Chem.

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. Can. J. Chem. 59, 1969Chem. 59, (1981. The hydration of solid particles in aqueous solution is treated as a patchwise phenomenon, in which the orientation of water dipoles varies in a patchwise fashion along the surface. The idea is applied to the AgI system where besides the neutral surface Ag+ patches and I-patches are distinguished. A first-order elaboration is offered, including an analysis of the relation between overall macroscopic quantities and local properties. The model offers an interpretation of two characteristics of double layers on silver iodide: the asymmetry of its p.2.c. and the conspicuous capacitance rise on the positive side and may serve as a starting point for a better description of the typical differences between the double layers on AgI and Hg.ARIE DE KEIZER et JOHANNES LYKLEMA. Can. J. Chem. 59, 1969 (1981. On considtre I'hydratation des particules solides en solution aqueuse comme un phenomtne impliquant des blocs dans lesquels I'orientation des dipBles de I'eau varie avec les blocs presents a la surface. On a applique ce concept a un systtme de AgI dans lequel en plus du bloc neutre, on peut distinguer des blocs de Ag+ et d'autres de I-. On presente une etude approfondie de premier ordre comportant une analyse de la relation entre les quantites macroscopiques globales et les proprietes locales. Le modele propose une interpretation pour deux caracteristiques de la couche double sur I'iodure d'argent: I'asymetrie de son c.2.p. et I'augmentation manifeste de la capacite de la partie positive; ce modtle peut servir de point de depart pour une meilleure description des differences caracteristiques entre les couches doubles sur AgI et Hg.[ Traduit par le journal]Introduction patches of differing hydration properties is explicitly The description of the orientation of water (and accounted for. The first category encompasses the other) dipoles near a phase boundary remains one of main body of what has hitherto been studied, but the most difficult problems of interfacial electro-here we intend to emphasize the second. "Interfacial chemistry, The majority of models refer to the hydration" is interpreted here in the general sense metal-water interface. The statemofmart in this field aS including all variations of the properties of water has been covered in an excellent review by Trasatti due to an adjacent phase, including those near water-(1). However, it is questionable whether the results rejecting surfaces, giving rise to hydrophobic obtained for metal-water interfaces are of immediate applicability to non-rnetal solid-water interfaces, asIn this paper we will emphasize the orientational occurring in many disperse systems. More often than properties of the solvent molecules. The model to be not the charge on the surface is localized, while in developed will be applied to the silver iodideaddition solid surfaces are often heterogeneous. ~t aqueous solution interface (2) and incorporated in a follows that the state of hydration, or, for that theory of the AgI-electrolyte interface, which ...

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