najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2018-9-4-558-567najo-791Research ArticleCHEMISTRY AND MATERIAL SCIENCEХИМИЯ И МАТЕРИАЛОВЕДЕНИЕHigh-temperature synthesis of finely dispersed oxide materials and C12A7:e electrides in carbon nanoreactor conditionsVolodinA. M.

Prospekt Lavrentieva, 5, Novosibirsk, 630090

volodin@catalysis.ruBediloA. F.

Prospekt Lavrentieva, 5, Novosibirsk, 630090

StoyanovskiiV. O.

Prospekt Lavrentieva, 5, Novosibirsk, 630090

ZaikovskiiV. I.

Prospekt Lavrentieva, 5, Novosibirsk, 630090

Boreskov Institute of CatalysisRussian Federation20181308202594558567Copyright © Volodin A.M., Bedilo A.F., Stoyanovskii V.O., Zaikovskii V.I., 20252025Volodin A.M., Bedilo A.F., Stoyanovskii V.O., Zaikovskii V.I.Volodin A.M., Bedilo A.F., Stoyanovskii V.O., Zaikovskii V.I.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/791

Solid-state transformations of the oxide core in core-shell structures Oxide@C consisting of oxide nanoparticles covered with a carbon coating were studied at temperatures of up to 1500 ◦C. It is shown that such coating can stabilize the size of the oxide core nanoparticles for alumina, zirconia, calcium and lanthanum aluminates and act as a shell of a nanoreactor where phase and chemical transformation can take place. For ZrO2@C and Al2O3@C it is demonstrated that it is the preservation of the small particle size that accounts for the preservation of cubic ZrO2 and δ-Al2O3 until the carbothermal reduction temperatures of the corresponding oxides (above 1400 ◦C for Al2O3). The electride state C12A7:e is shown to be formed in C12A7@C material at temperatures above its melting point. The surface of activated C12A7 was found to have a significant concentration of active OH radicals capable of converting diphenylamine into stable nitroxyl radicals.

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The authors declare that there are no conflicts of interest present.