FIELD: inorganic chemistry, possible use in bio-medical research and during manufacture of non-magnetic materials, sorbents.
SUBSTANCE: in accordance to the method, industrial mixture of diamond with graphite and metals is processed by mixture of acids and oxidizing compounds. The suspension is additionally processed by cleaned concentrated hydrochloric acid with concentration of nano-diamonds in the hydrochloric acid not exceeding two percents with simultaneous ultrasound processing. Temperature of suspension is measured. Then temperature increases by at least ten degrees, irradiation is stopped. Suspension is settled. Aforementioned operations are repeated at least three times. Then suspension is washed by cleaned concentrated hydrochloric acid until coloration disappears and thiocyanate sample reaction becomes positive. Final washing is performed by deionized water until suspension stops settling.
EFFECT: resulting nano-diamonds do not contain admixtures of iron.
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