Certain Aspects of the Interpretation of Immersional Heats of Gels

Hackerman, N.; Wade, William H.

doi:10.1021/j100788a517

Cited by 6 publications

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“…Clearly this situation is quite different from ordinary reversible physical adsorption, e.g., the adsorption of rare gases on highly graphitized carbon blacks. 18 The net differential heat of adsorption results for samples E and I reinforce the idea that high-temperature calcining (1200°a nd above) produces an ideal planar surface which is experimentally devoid of surface heterogeneities.9 With these results it is possible to give semiquantitative enthalpy values for the idealized surface reactions of hydroxylation and subsequent associative adsorption by means of hydration of the surface hydroxyl groups. These reactions are depicted schematically in eq 1-3.…”

Section: Resultsmentioning

confidence: 55%

Heats of immersion in the thorium oxide-water system. IV. Variation of the net differential heat of adsorption with specific surface area

Holmes¹,

Fuller²,

Secoy³

1968

J. Phys. Chem.

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Section: Resultsmentioning

confidence: 55%

Heats of immersion in the thorium oxide-water system. IV. Variation of the net differential heat of adsorption with specific surface area

Holmes¹,

Fuller²,

Secoy³

1968

J. Phys. Chem.

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Model calculations for capillary condensation

Melrose

1966

AIChE Journal

164

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Capillary phenomena arising from vapor phase condensation in porous media are discussed in the light of an exact interface curvature theory and a self-consistent thermodynamic theory. The system studied consists of liquid condensed in the form of pendular rings a t the contact points between identical spherical particles. The geometrical parameters-the curvature, the confined volume, and the surface are0 of the liquid-vapor interface-must be expressed in terms of incomplete elliptic integrals. In addition several corrections are introduced for the classical Kelvin relation for lowering of vapor pressure. One of these is based on the density dependence of the isothermal thermodynamic susceptibility. Since the susceptibility vanishes a t large negative pressures, an upper limit to the curvature is established. The balance equation for the extensive free energy is considered from the point of view of hydrostatic principles. 192 2Further, component 1, the solid, is in the form of two identical spherical particles in contact. These particles, of radius R, are taken to be incompressible, as well as insoluble in the fluid phases. In all thermodynamic states which will be considered, the suiface state of strain for the solid phase remains unchanged. To within the limits required by a thermodynamic treatment, the state of strain in the solid surface is also homogeneous and isotropic, in a two-dimensional sense. Such restrictions suffice to define the so-called inert adsorbent model of the solid phase.The external boundaries of the system are assumed to be in contact only with the vapor phase. Hence, the liquid phase, if it exists, is in the form of condensate at the

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