Carbodeon Ltd. Oy

Valery Dolmatov

Vesa Myllymäki

A mild, acid- and alkali-free purification method of detonation nanodiamond material from water-insoluble metal-containing impurities and product obtained thereof. The products thus obtained include nanodiamond and diamond-containing detonation blend. The method is implemented by an impact treatment of the detonation nanodiamond material with aqueous or water organic solutions of chelating agents in concentrations 0.5-20 wt. % at elevated temperature, wherein the weight-percent ratio of the detonation nanodiamond material to an undiluted chelating agent is substantially 1 to 0.2. Impact treatment of the detonation nanodiamond material in chelating agent solution may include boiling, ultrasonication, cavitational disintegration, and harsh treatment in sealed chamber at temperatures of up to about 300&#xb0; C. and high pressure. The method provides at least 5-fold reduction of metal-containing impurities in the resulting product, wherein the content of such elements as chromium and iron is reduced to negligible amounts.

Growing community of inventors

Vantaa, Finland

Valery Dolmatov