Small-angle scattering from polydisperse particles with a diffusive surface

Small-angle scattering from polydisperse non-homogeneous particles with a diffusive interface is considered for the case of low diffusivity. The deduced simplifications in the analysis of both the polydispersity and the inner structure (contrast variation) of the particles are used in the treatment of small-angle neutron scattering data from liquid dispersions of detonation nanodiamond.