[en] 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.
Disciplines :
Materials science & engineering Chemistry
Author, co-author :
Gommes, Cédric ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Ravikovitch, Peter
Neimark, Alexander
Language :
English
Title :
Positive curvature effects and interparticle capillary condensation during nitrogen adsorption in particulate porous materials
Scherer G.W. J. Colloid Interface Sci. 202 (1998) 399
Neimark A.V. Kolloidn. Zh. 47 (1985) 531
Neimark A.V., and Rabinovitch A.B. Kolloidn. Zh. 47 (1985) 1103
Gommes C.J., Basiura M., Goderis B., Pirard J.-P., and Blacher S. J. Phys. Chem. B 110 (2006) 7757
Rigacci A., Einarsrud M.-A., Nilsen E., Pirard R., Ehrburger-Dolle F., and Chevallier B. J. Non-Cryst. Solids 350 (2004) 196
Scherer G.W., Smith D.M., and Stein S. J. Non-Cryst. Solids 186 (1995) 309
de Gennes P.-G., Brochard-Wyart F., and Quéré D. Capillarity and Wetting Phenomena: Drops, Bubbles, Pearls, Waves (2004), Springer-Verlag, New York
Gregg S.J., and Sing K.S.W. Adsorption, Surface Area and Porosity (1982), Academic Press, London
Press W.H., Teukolsky S.A., Vetterling W., and Flannery B.P. Numerical Recipes in C++: The Art of Scientific Computing (2002), Cambridge Univ. Press, Cambridge
Adamson A.W., and Gast A.P. Physical Chemistry of Surfaces. sixth ed. (1997), Wiley-Interscience
Jaroniec M., Kruk M., and Olivier J.P. Langmuir 15 (1999) 5410
Hakuman M., and Naono H. J. Colloid Interface Sci. 241 (2001) 127
