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Scientists Have Developed A New Method for Preparing Nano-diamonds

wallpapers Industry 2020-08-11

Researchers from the Institute of Physics and Technology of the Russian Academy of Sciences and the Petersburg State Institute of Chemical and Pharmaceutical Research have researched the optical screening method of detonation nanodiamonds. Through experiments, it has been proved that diamonds with a diameter of 3 to 6 nanometers have unique spectral absorption characteristics. It is possible to obtain a purer nanodiamond suspension.

Because the detonation method has the weakness of large amounts of impurities, it has not been widely used. But in the past ten years, the development of detonation related purification technology has attracted the attention of researchers who use it as the simplest method to obtain diamonds. In the past, the application of nanodiamond was limited to the field of polycrystalline, polishing agents, and other abrasives. With the deepening of people's understanding of nanodiamonds' properties, nanodiamonds have begun to be used in metal coatings, lubricants, magnetic recording systems, medicine, and other fields the application areas are still expanding.

Nanodiamond particles produced in Russia generally have a diameter of 200 to 400 nanometers. The research team first pulverized nanodiamond particles to 4 nanometers, then applied an extraordinary method to multi-stage heating of nanodiamond suspension. Then, they were treated with acid and ultrasonic to obtain a dark brown nanodiamond emulsion suspension, which was better than using standard simple ball milling technology. The result is purer and more transparent.

As for the unique spectral absorption characteristics of diamonds with a diameter of 3-6 nanometers, the reason is that dimer molecule composed of two carbon atoms are formed on the surface of nanodiamonds to reduce the surface area. This hypothesis of the scientist has a theoretical basis and is consistent with the experimental data. Besides, the spectral absorption experiment performed on the larger nanodiamond particles caused the disappearance of the phantom absorption phenomenon due to the low dimer ratio.

The work done by Russian researchers contributes to the optical analysis of nanodiamonds and the first step towards the preparation of transparent nanodiamond suspensions. This feature may open a broader space for the application of nanodiamonds.


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Tag: Nano-diamonds