Spatial organization of sodium nitrite nanoparticles in porous glass with interface modified by titanium dioxide

The results of a study of the effect of titanium oxide modification of the porous glass – sodium nitrite interface on the spatial organization of NaNO$_2$ nanoparticles obtained by introducing sodium nitrite from an aqueous solution into the pore space of a mesoporous glass matrix with an average channel (pore) diameter of 6(1) nm (PG6) are presented. It is shown, that in the nanocomposite (NCM) PG6+TiO$_2$+NaNO$_2$ sodium nitrite forms nanoagglomerates with a radius of gyration of $\sim$ 68 nm, in which the amorphous and crystalline phases coexist. On a spatial scale from 2 to 27 nm, a surface fractal-type structure is realized in this NCM, described by the scattering law $I(Q)\sim Q^{-\alpha}$ ($Q$ is the transferred momentum) with $\alpha$ = 3.57(2). The sizes of coherent scattering regions for sodium nitrite nanoparticles in PG6+NaNO$_2$ and PG6+TiO$_2$+NaNO$_2$ nanocomposites ($\sim$ 10 nm) have been determined.