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Presents a polydisperse analysis of absolute small-angle intensities scattered by activated carbons. Description of the analyzed samples and absolute intensities; Assumptions and description of the model; Calculation of the corresponding specific surfaces and densities of the samples.

Deals with a study which analyzed small-angle x-ray intensities scattered by natural coals, assuming that coals behave as polydisperse distributions of cubic particles. Comparison between fractality and polydispersity; Evaluation of the particle form factors; Discussion of the dependence of particle form factors on the interlayer spacing.

Shows that the Porod coefficient is proportional to the sum of the reciprocal Gaussian curvatures at all the points of the interface where the normals are either parallel or antiparallel to the direction of the considered scattering vector. Generalization of the results to particles with non-convex surfaces; Three kinds of q-tangency points.

Reports that the integral expressions of the derivatives of the small-angle scattering correlation function are obtained in terms of the parametric equations of the interphase surfaces. Integral expression for each derivative; Limiting values of the derivatives of the correlation function.