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Abstract
This study examines the oxidation kinetics of nanodiamonds (NDs) and carbon black (CB), taken for comparison, in air oxygen . The oxidation rate constants and parameters of the Arrhenius equation were determined under isothermal conditions within a temperature range from 430 to 560 °C. Thermal behavior of both carbon nanomaterials was investigated using non-isothermal thermogravimetric analysis (TGA) experiments in air and argon. Powders of NDs and CB were characterized by nitrogen adsorption, scanning electron microscopy and energy dispersion X-ray microanalysis, ATR Infrared spectroscopy, and the total titration. The effect of various parameters of the carbon nanomaterials on the oxidation rate, such as oxygen content, surface area, ash and admixture contents, and functional groups coverage, was investigated. Overall, this study confirms that the oxygen-containing surface groups generating active sites upon thermal decomposition have a major impact on the oxidation ability of NDs and CB.
Acknowledgments
This work was supported by Grants of the Ministry of Education and Science of Ukraine [0111U006260], [0114U003554], and [0116U002558]. V.V.L. thanks the National Scholarship Program of the Slovak Republic for the Mobility of Students, Ph.D. Students, University Teachers, Researchers and Artists, Slovak Academic Information Agency (SAIA) Grants, n.o., in 2015 [14511], in 2017 [20917]; and International Visegrad Fund for scholarship ID number [51810574] in 2018.