Calculation of the Kinetics of Interaction of Alkali Borosilicate Glasses with Aqueous Solutions

Calculation of the leaching kinetics of sodium borosilicate glasses in aqueous solutions of acids

“…This work is a continuation of our previous study [1]. It is devoted to the investigation into the effects of the mass transfer delay observed during the interaction of sodium borosilicate glasses with aqueous solutions of acids.…”

“…The synthesis conditions and the procedure used for acid leaching of the glasses were described in detail in [5]. In the present work, we analyzed new (as compared to [1]) experimental data taken from [4,5] on the interaction of plates prepared from the single-phase sodium borosilicate glasses 12/56 and 16/40 with a 0.1 M HNO 3 solution at a temperature of 50 ° C without forced stirring. The single-phase glasses were identical in composition to the unstable phase of the two-phase glass 7/70 of the as-batched composition (mol %) 7.0Na 2 O · 22.0B 2 O 3 · 70SiO 2 , which was subjected to heat treatment at temperatures of 700 and 550 ° C, respectively.…”

“…This process provides the basis for the technology of preparation of porous glasses intended for various purposes [2]. Earlier [1], we developed a method for studying the specific features of the mass transfer delay on the basis of the wave diffusion model [3]. The proposed method makes it possible (i) to construct the time dependence of the integrated characteristic of the process, which adequately describes the experimental data; (ii) to calculate the depth of the leached layer at different diffusion times; and (iii) to determine the parameters of the establishment of a quasi-stationary regime of the process.…”