Positive curvature effects and interparticle capillary condensation during nitrogen adsorption in particulate porous materials

Cedric J. Gommes, Peter Ravikovitch, Alexander Neimark

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The adsorption of nitrogen in a collection of spheres that touch or merge in a sintering-like manner is modeled using a Derjaguin-Broeckhof-de Boer approach. The proposed model accounts for both positive curvature effects and for capillary condensation at the contact between two spheres. A methodology is proposed to fit the P / P0 > 0.4 adsorption region with the coordination number of the spheres as the only adjustable parameter. The use of the model is illustrated on a series of silica aerogels. The suitability of various standard isotherms needed for the modeling is also discussed.

Original languageEnglish (US)
Pages (from-to)415-421
Number of pages7
JournalJournal of Colloid And Interface Science
Volume314
Issue number2
DOIs
StatePublished - Oct 15 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Keywords

  • Capillary condensation
  • Nitrogen adsorption
  • Particulate solids

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