Physico-Chemical nanomaterials science

Kinetic analysis of nanodiamonds oxidation
Zabuga V.Ya.1, Bochechka O.O.2, Tsapyuk G.G.1, Diyuk V.E.1, 
Kurylyak T.O.2, and Lisnyak V.V.1
1 Faculty of Chemistry, Taras Shevchenko National University of Kyiv. Volodymyrska Str., 64, Kyiv-01601, Ukraine. 
E-mail: lisnyak@univ.kiev.ua
2 V.N. Bakul Institute for Superhard Materials of NAS of Ukraine, Avtozavodska, 2, Kyiv-04074, Ukraine
Nanodiamonds composed of ~5 nm have a large accessible surface and tailorable surface chemistry. They unique optical, mechanical and thermal properties has been demonstrated, however, the oxidation of nanodiamonds is poorly reported. Among important factors that effects on the oxidation are purity, surface chemistry, dispersion quality, temperature and the total composition. Nanodiamonds were characterized by thermal analysis in air and argon [1], by nitrogen adsorption, scanning microscopy and energy dispersion X-ray microanalysis, Infrared spectroscopy, and the Boehm titration. The macrokinetics of isothermal oxidation of nanodiamonds by air oxygen was studied and the rate constants and parameters of the Arrhenius equation were determined. The oxidation of nanodiamonds depends on the pretreatment and on the concentration of oxygen-containing functional groups diffusion is found. Thermal decomposition of the surface oxygen-containing groups has an impact on the oxidation ability of nanodiamonds by freeing additional active centers of reaction. The kinetic data were compared with that for a carbon soot of native Ukrainian trademark.

1.	Zabuga V.Ya., Bochechko O.O. et al. On multiwalled carbon nanotubes oxidation: Thermogravimetric, spectral and macrokinetic studies: The role of bromine plasma pretreatment. // Mol Cryst Liq Cryst.-2018.-661.-P. 81-90.