J. Phys. I France
Volume 2, Numéro 6, June 1992
Page(s) 791 - 799
DOI: 10.1051/jp1:1992179
J. Phys. I France 2 (1992) 791-799

Small-angle neutron scattering in model porous systems : a study of fractal aggregates of silica spheres

Marie Foret, Jacques Pelous and René Vacher

Laboratoire de Science des Matériaux Vitreux URA CNRS n° 1119, Université de Montpellier II, F-34095 Montpellier Cedex, France

(Received 30 December 1991, accepted 13 February 1992)

Porous solids built of fractal clusters can be obtained by destabilization of quasi-monodisperse silica sols. Small-angle neutron scattering, associated with transmission-electron microscopy, was used for a structural investigation of these aerogels in a broad length scale. We present a quantitative analysis of the data for materials with different particle sizes and polydispersities. The analysis of the wavector region corresponding to the crossover between surface and volume scattering is especially emphasized.

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