Structural Parameters of Ordered Nanocomposites Based on Opal Matrices in Accordance with the Data of Small-Angle X-ray and Neutron Scattering: Simulation of Structural and Size Dispersion Characteristics of Nanocomposites. Part II

Abstract

The structure of nanocomposites based on opal matrices in relation to the type of filling the structural voids by amorphous and crystalline substances is investigated using small-angle X-ray and neutron scattering (SAXS and SANS, respectively). An analysis of neutron-scattering data shows that the samples are ordered structures with parameters corresponding to the face-centered cubic lattice. The order of filling the octahedral and tetrahedral voids of the opal matrix with different substances affects the SANS reflection patterns. It is shown that the scattering curves can be described and interpreted, depending on the composition and filling sequence of the ordered nanocomposite, using different models, e.g., from the standpoint of models of monodisperse systems accounting for the interparticle interference or polydisperse systems of scattering irregularities. The structural parameters of ordered nanocomposites based on opal matrices of different compositions are determined.