Standard (master) isotherms of alumina, magnesia, titania and controlled-pore glass

Matějová, Lenka; Šolcová, Olga; Schneider, P.

doi:10.1016/j.micromeso.2007.03.009

Cited by 26 publications

(25 citation statements)

References 15 publications

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“…It can be seen that the predicted thermodynamic isotherm agrees closely with all four data sets of different samples of α-alumina in the respective hetero-Figure 5. ZAI analysis of N 2 vapor adsorption measurements on four different α-alumina samples that were reported by C ̌ejka et al, 40 Melgunov et al, 41 Jaroniec et al, 42 and Mateǰováet al 43 These measurements are indicated in (a) by symbols. The mass-specific ZAIs are shown by solid lines and were calculated using eq 55 and their respective isotherm constants (Table 3).…”

Section: Thermodynamic Isotherm Of N 2 Vapor Adsorbing On Aluminamentioning

confidence: 94%

Thermodynamic N₂ Vapor Isotherms of Materials: Zeta Adsorption Isotherm Approach

Narayanaswamy

Ward

2021

J. Phys. Chem. C

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For N2 vapor adsorbing on a nanopowder at 77 K, we use a multicomponent canonical ensemble to determine the conditions for equilibrium between a contacting vapor phase and the adsorbed molecular clusters. Provided the substrate variations (heterogeneities) do not cause a phase transition, such as wetting or capillary condensation, we show that the equilibrium conditions allow an expression for an adsorption isotherm to be formed. The isotherm expression contains four constants that are to be obtained empirically from mass-specific adsorption measurements. The specific surface area of a substrate is expressed in terms of the specific number of adsorption sites and the cross-sectional area of an adsorbed N2 molecule on materials. This procedure is investigated by using the respective specific surface areas of different samples of a given material to transform the data into an area-specific basis. We pooled data sets from multiple samples with possibly different specific surface areas to form a single data set. The thermodynamic (zeta adsorption) isotherm is formulated after a regression analysis is performed on the pooled data set. This isotherm is used with the Gibbs adsorption equation to obtain the solid surface energy of a material as a function of the amount adsorbed. Five materials are examined: silica, α-alumina, γ-alumina, carbon black, and graphitized carbon. Their respective solid surface energies are each shown to be a material property.

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Section: Thermodynamic Isotherm Of N 2 Vapor Adsorbing On Aluminamentioning

confidence: 94%

Thermodynamic N₂ Vapor Isotherms of Materials: Zeta Adsorption Isotherm Approach

Narayanaswamy

Ward

2021

J. Phys. Chem. C

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“…(11) The solid line was calculated using eq 2 and the values of the adsorption parameters listed in Table 1.…”

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confidence: 99%

Surface Tension of Solids in the Absence of Adsorption

Ghasemi¹,

Ward²

2009

J. Phys. Chem. B

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A method has been recently proposed for determining the value of the surface tension of a solid in the absence of adsorption, γS0, using material properties determined from vapor adsorption experiments. If valid, the value obtained for γS0 must be independent of the vapor used. We apply the proposed method to determine the value of γS0 for four solids using at least two vapors for each solid and find results that support the proposed method for determining γS0.

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“…Acenaphthene isotherms show a typical L 3 or S 1 type profiles of Giles classification [8]. Thus, at 298 and 313 K there is an initial sorption stage (up to C eq = 0.6-0.8 ppm) where the sorption follows a sorption favourable shape (concave shape), thereafter a sharp increase in Q e is experienced for increasing values of C eq (type L 3 ), this is typical of finely divided non-porous materials, as it is the case [9]. When temperature is raised to 333 K, the first step disappears and a typical type S isotherm (non-favourable) is obtained.…”

Section: Equilibrium Experimentsmentioning

confidence: 86%

“…4 were modelled by considering the peculiar shape of the curves. The following expressions were used [12] Freundlich : Q i = K F C n i (9) Oswin :…”

Section: Equilibrium Sorption Of Pah Mixturesmentioning

confidence: 99%

Polycyclic aromatic hydrocarbons sorption on soils: Some anomalous isotherms

Rivas¹,

Calle²,

Álvarez³

et al. 2008

Journal of Hazardous Materials

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Standard (master) isotherms of alumina, magnesia, titania and controlled-pore glass

Cited by 26 publications

References 15 publications

Thermodynamic N₂ Vapor Isotherms of Materials: Zeta Adsorption Isotherm Approach

Thermodynamic N₂ Vapor Isotherms of Materials: Zeta Adsorption Isotherm Approach

Surface Tension of Solids in the Absence of Adsorption

Polycyclic aromatic hydrocarbons sorption on soils: Some anomalous isotherms

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Standard (master) isotherms of alumina, magnesia, titania and controlled-pore glass

Cited by 26 publications

References 15 publications

Thermodynamic N2 Vapor Isotherms of Materials: Zeta Adsorption Isotherm Approach

Thermodynamic N2 Vapor Isotherms of Materials: Zeta Adsorption Isotherm Approach

Surface Tension of Solids in the Absence of Adsorption

Polycyclic aromatic hydrocarbons sorption on soils: Some anomalous isotherms

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Product

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Thermodynamic N₂ Vapor Isotherms of Materials: Zeta Adsorption Isotherm Approach

Thermodynamic N₂ Vapor Isotherms of Materials: Zeta Adsorption Isotherm Approach