EXPERIMENTAL STUDIES OF ADSORPTION-STRUCTURAL CHARACTERISTICS OF SYNTHETIC DIAMOND POWDER, AS IS AND AFTER THEIR MODIFICATION

Abstract

The results of the study of the adsorption-structural characteristics of the surface of synthetic diamond micro- and grinding powders are presented. The purpose of this work is to study the adsorption-structural characteristics of synthetic diamond micro- and grinding powders, both initial and after their modification. Micropowders of the ASM brand with a grain size of 20/14, grinding powders of the AC20 brands with a grain size of 100/80, AC6 with a grain size of 125/100, and AC100 with a grain size of 400/315 were studied. Modification was performed by chemical treatment by liquid-phase oxidation of various concentrations and pulse treatment with high-voltage electric discharges in an aqueous environment. Adsorption-structural characteristics: in particular, specific surface area; specific pore volume; average pore radius; The total pore volume, the distribution of pore volumes by their sizes were determined by analyzing the isotherms of low-temperature nitrogen adsorption-desorption using the NOVA 2200 "Quantachrome" gas adsorption analyzer (USA). The results of the study showed that the specific surface area of ​​the original micropowders and grinding powders tends to decrease with increasing granularity and strength of the powders. After modifying the powders, this trend persists. Micropowders and grinding powders have a developed mesoporous surface structure. Modification using liquid-phase oxidation; pulsed treatment with high-voltage electric discharges in an aqueous environment of the initial micro- and grinding powders of synthetic diamond allows you to change the adsorption-structural characteristics of the powders, in particular the specific surface area; specific pore volume; average pore radius; total pore volume, distribution of pore volumes by their sizes. The results obtained can be the basis for further development of a database for the formation of optimal conditions for obtaining adsorption-structural characteristics of synthetic diamond powders of wide functional purpose.