NANODIAMONDS HAVING ACID FUNCTIONAL GROUP, AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2019 - IPC C01B32/15 C01B32/28 B82B1/00 B82B3/00 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: invention relates to nanotechnology. Nanodiamond obtained by detonation synthesis containing 0.15 mmol/g or more of acid functional groups, oxidative treatment is carried out with at least one oxidant selected from a group consisting of chromic acid, chromic anhydride, dichromic acid, manganic acid, perchloric acid, salts of said acids and hydrogen peroxide. Oxidative treatment can be carried out in the presence of sulphuric acid at temperature 130 °C or higher. If nanodiamonds do not contain acidic functional groups as a result of detonation synthesis, nanodiamond blend can be treated with mineral acid. Suspension of nanodiamonds after oxidative treatment can be subjected to disaggregating treatment. Obtained nanodiamonds have specific surface area of 150 m²/g or more and carboxyl functional groups with numerical density of 1 or more groups per square nanometer of the surface. Nanodiamond particles have d50 of 9 nm or less. High dispersibility of nanodiamond in dispersion media, for example in water, to obtain a stable dispersion.

EFFECT: invention can be used in production of lubricating, abrasive or insulating materials.

9 cl, 2 ex