V.A. Kreisberg, V.P. Rakcheev, T.V. Antropova
Trimodal nanoporosity of porous glasses
Optica Applicata (2003) (in print)

ABSTRACT.
Polymodal nanoporosity of porous glasses with normal type of light scattering was studied by two new methods: a kinetic method of diffusion diagnostics (DD-method) and an equilibrium method of gas desorption at low partial pressures (LPED-method). The computer fitting of diffusion and equilibrium desorption isotherms of nitrogen, oxygen and argon at 77.5 K revealed the availability microporous substructure in mesoporous materials. Polymodal nanoporous structure of porous glasses consists essentially of transporting mesopores with mean diameter from 4 to 15 nm and some kinds of adsorbing micropores with diameter 0.3 - 2 nm including ultramicropores of molecular size. The dependence of nanoporous morphology on conditions of producing porous glasses and their content was established.