Adsorption in Sparse Networks: II. Silica Aerogels

The model developed in Part I is applied to nitrogen adsorption isotherms obtained for a series of silica aerogels whose densities are varied by partial sintering. The isotherms are adequately described by a cubic network model, with all of the pores falling in the mesopore range; the adsorption and...

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Bibliographic Details
Published in:Journal of colloid and interface science 1998-06, Vol.202 (2), p.411-416
Main Authors: Scherer, George W, Calas, Sylvie, Sempéré, Robert
Format: Article
Language:English
Subjects:
adsorption
aerogel
Chemistry
Colloidal gels. Colloidal sols
Colloidal state and disperse state
condensation
curvature
Exact sciences and technology
General and physical chemistry
network
Porous materials
silica
sintering
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Summary:The model developed in Part I is applied to nitrogen adsorption isotherms obtained for a series of silica aerogels whose densities are varied by partial sintering. The isotherms are adequately described by a cubic network model, with all of the pores falling in the mesopore range; the adsorption and desorption branches are fit by the same pore size distribution. For the least dense gels, a substantial portion of the pore volume is not detected by condensation. The model attributes this effect to the shape of the adsorbate/adsorptive interface, which can adopt zero curvature even in mesopores, because of the shape of the network.
ISSN:0021-9797
1095-7103
DOI:10.1006/jcis.1998.5459