Interprétation de la diffusion centrale des rayons X par les systèmes poreux. II. Exemples d'application

The method proposed in part I for the interpretation of small angle scattering data is applied to various concentrated systems. For a dilute system, small angle scattering provides the φ(l) distribution of chords directly in the scattering units. Two examples of dilute particle suspensions are studied: firstly rounded particles of polytetrafluoroethylene and secondly cubic microcrystals of MgO. Thus we have obtained the φ(l) distributions characteristic of particles with or without sharp edges. For concentrated systems, when the φ(l) distribution of particle chords is known, small angle scattering provides the f(m) distribution of interparticle spacings. The result, applied to a porous aggregate of the rounded particles, already studied in a dilute state, and to a concentrated suspension of the same particles, gives two f(m) distributions distinctly characteristic of each state.