Researchers at the Institute of Physics and Technology of the Russian Academy of Sciences and the National Institute of Chemical Pharmaceuticals of Petersburg have conducted research on the optical screening method of detonation nanodiamonds. It has been proved by experiments that diamonds with a diameter of 3 to 6 nm have unique spectral absorption characteristics. A purer nanodiamond suspension is available. This method is not widely used because of the weakness of the mass spectrometry. But in the past decade, the development of detonation-related purification technology has once again attracted the attention of researchers who use it as the easiest way to obtain diamonds. The application of nanodiamonds has been limited to the field of abrasives such as polycrystals and polishing agents. With the deepening of the understanding of the properties of nano-diamonds, nano-diamonds have begun to be applied in the fields of metal plating, lubricating oil, magnetic recording systems, medicine, etc., and the application fields are still expanding. Nanodiamond particles produced in Russia are generally 200 to 400 nanometers in diameter. The research team first pulverized the nano-diamond particles to 4 nanometers, and then applied a special method to multi-stage heating of the nano-diamond suspension, followed by acid and ultrasonic treatment to obtain a dark brown nano-diamond emulsion suspension, which was better than the standard simple ball milling technique. The result is purer and more transparent. The spectral absorption characteristics unique to diamonds having a diameter of 3 to 6 nm are due to the dimer molecules composed of two carbon atoms which are formed on the surface of the nanodiamond to reduce the surface area. This hypothesis of scientists has a theoretical basis and is consistent with the experimental data. In addition, for the spectral absorption experiments performed on larger nano-diamond particles, the spectral absorption phenomenon disappears due to the lower proportion of dimers. The work done by Russian researchers is not only a contribution to the optical analysis of nanodiamonds, but also the first step towards the preparation of transparent nanodiamond suspensions, which may open up a wider space for the application of nanodiamonds.
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