Influence of Ultrasonic Treatment on the Microstructure of Particles of Detonation Synthesis Nanodiamonds

摘要

We investigated the microstructure of particles after ultrasonic treatment of aqueous suspensions of detonation synthesis nanodiamond (DND) and polycrystalline detonation nanodiamond (DALAN) powders. After processing and drying the powder, we measured the specific surface area (by the BET method), the sizes of microcrystallites, the degree of crystallinity and the parameters of the crystal lattice. The study of the phase composition and microstructure was carried out by X-ray diffraction analysis on an XRD-6000 diffractometer using CuKa radiation. The phase composition analysis was carried out using PDF 4+ databases, as well as the POWDER CELL 2.4 full profile analysis program. The particle size distribution of the obtained oil suspensions was measured using an OLYMPUS OMEC DC130 optical analyzer. It is shown that the size of microcrystallites, the degree of crystallinity of nanodiamond particles decreases with ultrasonic treatment. The specific surface area of DND particles decreased, while for DALAN it increased after the ultrasound. On the other hand, microstresses of the second kind increase significantly, which means that the excess surface energy stored in the particles also increases. Possible mechanisms of changes in the considered characteristics of nanodiamond particles under the action of ultrasound are discussed.