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NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2016, 7 (1), P. 234–243

Reactivity in combustion process for expanded graphites: influence of dimensional effect

V. A. Logvinenko – Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University, Novosibirsk 630090, Russia; val@niic.nsc.ru
V. G. Makotchenko – Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia; mwg@niic.nsc.ru
V. E. Fedorov – Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University, Novosibirsk 630090, Russia; fed@niic.nsc.ru

Thermal stability in combustion reaction for natural graphite, graphene and several expanded graphite phases were studied; the kinetic parameters of the oxidation reaction were calculated for two samples. Natural graphite (crystalline particles 200 – 300 μm) has the maximum stability (E1 = 201 ± 2 kJ/mol, lg A1 = 7.1 ± 0.1), while multilayer graphene is the most reactive (E2 = 120 ± 1 kJ/mol-1, lg A2 = 4.3 ± 0.10). The different sample grain sizes and their different structures result in different thermal stabilities: both in the reaction zones location (i.e. in the topochemical equation forms), and in the kinetic parameters’ values.

Keywords: natural graphite, graphene, expanded graphite, thermal stability, non-isothermal kinetics, combustion.

PACS 65.80.Ck; 65.80g; 82.60.Qr

DOI 10.17586/2220-8054-2016-7-1-234-243

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