The effect of evacuation, surfactant, prolonged thermal heating and irradiation with ultraviolet radiation on free radicals in detonation nanodiamond powders
Abstract
The effect of evacuation, surfactant, prolonged thermal heating, and irradiation with ultraviolet radiation on free radicals in detonation nanodiamond (DND) powders was studied by electron paramagnetic resonance. A model of a DND particle consisting of a diamond lattice core and a fullerene-like shell with a surface covered by functional groups is established. Most of paramagnetic centers (PC), shielded from the effects of evacuation and surfactant molecules, are localized within the core of particle. About 10 % paramagnetic centers are on the outside of fullerene-like shell. A change is observed in the EPR line shape under these effects, which reflects the change in the distribution of the PC as a whole in DND powders.
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