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Small‐angle Scattering Studies of Adsorption and of Capillary Condensation in Porous Solids by Ernst Hoinkis is a Materials Science article available to read on EtoBox.

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## Abstract Small‐angle scattering (SAS) studies are reviewed of adsorption and capillary condensation of water, hydrocarbons and halogenated hydrocarbons near room temperature, and of nitrogen at 78 K in some mesoporous solids, mainly silicas. The theory needed for the interpretation of SAS data is briefly covered. Calculations of the scattered intensity __I__(__q__) for a model porous medium show that __I__(__q__) depends markedly on the film thickness __t.__ Adsorption and capillary condensation of nitrogen at 78 K in mesoporous silicas was studied by use of __in situ__ SANS, and __t__ as function of the relative pressure __P__/__P__~__s__~ was estimated. Adsorption of N~2~ in defects within the silica skeleton at __P__/__P__~__s__~<0.1 lead to a significant increase in __I__(__q__). Isolated vapor bubbles in capillary condensed nitrogen in a Gelsil^®^ appeared on adsorption near saturation of the pore system. The kinetics of capillary condensation and of drainage were followed. Power law scattering at low __q__ indicated the formation of ramified clusters of voids on drainage of liquid nitrogen from the xerogel Gelsil^®^. Similar clusters were observed on drainage of water from

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Author

Ernst Hoinkis

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 0934-0866)

Published

2004

Language

EN

Field

Materials Science (Physical Sciences)