A Comprehensive Presentation of the Thermodynamics of Adsorption Excess Quantities

Schay, Géza

doi:10.1351/pac197648040393

Cited by 53 publications

(23 citation statements)

References 22 publications

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“…The linear dependency of σ iw on T and a w is consistent with theoretical studies (Spaepen, 1994;Schay, 1976). In agreement with experimental measurements (Ketcham and Hobbs, 1969), Eq.…”

Section: Barahona: Ice Formation and Water Activity 24 Interfaciasupporting

confidence: 91%

“…This can be explained as follows. Considered as a separate phase, the interface obeys the Gibbs-Duhem equation (Schay, 1976). Therefore the chemical potential of the solute, and its molecular excess at the interface, can be written in terms of the chemical potential of water, hence a w .…”

Section: Energy Of Formation Of the Interfacementioning

confidence: 99%

“…By introducing the arbitrary dividing surface, an excess number of molecules is created around the interface between the liquid and the solid (Hiemenz and Rajagopalan, 1997). This is typically dealt with by selecting the so-called equimolecular dividing surface (EDS), in which the interface has energy but its net molecular excess is zero (Kashchiev, 2000;Schay, 1976). However the EDS cannot be defined simultaneously for the solute and the solvent.…”

Section: Barahona: Ice Formation and Water Activity 24 Interfaciamentioning

confidence: 99%

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Analysis of the effect of water activity on ice formation using a new thermodynamic framework

Barahona

2014

Atmos. Chem. Phys.

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Abstract. In this work a new thermodynamic framework is developed and used to investigate the effect of water activity on the formation of ice within supercooled droplets. The new framework is based on a novel concept where the interface is assumed to be made of liquid molecules "trapped" by the solid matrix. It also accounts for the change in the composition of the liquid phase upon nucleation. Using this framework, new expressions are developed for the critical ice germ size and the nucleation work with explicit dependencies on temperature and water activity. However unlike previous approaches, the new model does not depend on the interfacial tension between liquid and ice. The thermodynamic framework is introduced within classical nucleation theory to study the effect of water activity on the ice nucleation rate. Comparison against experimental results shows that the new approach is able to reproduce the observed effect of water activity on the nucleation rate and the freezing temperature. It allows for the first time a phenomenological derivation of the constant shift in water activity between melting and nucleation. The new framework offers a consistent thermodynamic view of ice nucleation, simple enough to be applied in atmospheric models of cloud formation.

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“…The linear dependency of σ iw on T and a w is consistent with theoretical studies (Spaepen, 1994;Schay, 1976). In agreement with experimental measurements (Ketcham and Hobbs, 1969), Eq.…”

Section: Barahona: Ice Formation and Water Activity 24 Interfaciasupporting

confidence: 91%

Section: Energy Of Formation Of the Interfacementioning

confidence: 99%

Section: Barahona: Ice Formation and Water Activity 24 Interfaciamentioning

confidence: 99%

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Analysis of the effect of water activity on ice formation using a new thermodynamic framework

Barahona

2014

Atmos. Chem. Phys.

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“…The difference, x 0 1 − x 1 = x 1 , can be determined by simple analytical methods. The relationship between the reduced adsorption excess amount calculated from the change in concentration, n σ (n) 1 = n 0 (x 0 1 − x 1 ) and the material content of the interfacial layer is given by the Ostwaldde-Izaguirre equation [21]- [25]. In the case of purely physical adsorption of binary mixtures, the material content of the adsorption layer (n s =n o −n) for component 1 is illustrated by the following material balance [22]- [25]:…”

Section: Adsorption Of Binary Liquid Mixtures On Solid Surfacesmentioning

confidence: 99%

“…Isotherms of types II, III and IV in the Schay-Nagy classification have the common characteristic that a fairly long section of the isotherm is practically linear [21][22][23][24][25]. For the linear section, we may write…”

Section: Adsorption Of Binary Liquid Mixtures On Solid Surfacesmentioning

confidence: 99%

The influence of the interfacial properties of composite catalyst material on the photocatalytic conversion of TiO_2 layer silicates

Kun

Dékány

2009

Per. Pol. Chem. Eng.

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Solid-gas and solid-liquid interfacial properties of titanium dioxide/layer silicate composite sorbents were studied by sorption experiments and the photocatalytic properties were also investigated.The photocatalyst TiO 2 was prepared by the sol-gel method and the sol obtained was used for heterocoagulation of Namontmorillonite at several different mass ratios, yielding supported photocatalysts of various compositions. The TiO 2 content of the samples ranged from 20 to 75 wt%. The specific surface areas of the samples, determined by nitrogen adsorption, ranged from 120 to 290 m 2 /g. The catalytic properties of TiO 2 /montmorillonite composites were tested by photooxidation of dichloro acetic acid (DCA). The specific surface area and the porosity exert a major influence on the photocatalytic efficiency through the interfacial layer properties. The rate of photo-oxidation of DCA depends strongly on the surface accessibility of the intermediates and the specific surface area calculated from gas and liquid mixture adsorption data. The conversion data of DCA presented show that the photocatalytic efficiency of TiO 2 can depend significantly on the accessibility of different molecules to the TiO 2 nanocrystals embedded in the layer silicate support in confined space.

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Adsorption from Ternary Liquid Mixtures on Partially Dehydroxylated Silica Gel

Goworek

Nieradka

1996

Journal of Colloid and Interface Science

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A Comprehensive Presentation of the Thermodynamics of Adsorption Excess Quantities

Cited by 53 publications

References 22 publications

Analysis of the effect of water activity on ice formation using a new thermodynamic framework

Analysis of the effect of water activity on ice formation using a new thermodynamic framework

The influence of the interfacial properties of composite catalyst material on the photocatalytic conversion of TiO_2 layer silicates

Adsorption from Ternary Liquid Mixtures on Partially Dehydroxylated Silica Gel

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