Temperature induced transition from hexagonal to circular pits in graphite oxidation by O2
| Autor: | Arnaud Delehouze, Jean-Marc Leyssale, Christine Labrugère, J.-F. Epherre, Francis Rebillat, Patrick Weisbecker, Gerard L. Vignoles |
|---|---|
| Přispěvatelé: | Laboratoire des Composites Thermostructuraux (LCTS), Université de Bordeaux (UB)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Snecma-SAFRAN group-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Physics and Astronomy (miscellaneous)
Scanning electron microscope Monte Carlo method Analytical chemistry 02 engineering and technology Edge (geometry) 010402 general chemistry Kinetic energy 01 natural sciences Molecular physics Atomic force microscopy Oxidation Solid-state phase transformations Kinetic Monte Carlo Graphite Environmental scanning electron microscope Chemistry Monte Carlo methods [CHIM.MATE]Chemical Sciences/Material chemistry Rate equation 021001 nanoscience & nanotechnology 0104 chemical sciences High-temperature effects 0210 nano-technology Scanning electron microscopy |
| Zdroj: | Applied Physics Letters Applied Physics Letters, American Institute of Physics, 2011, 99 (4), 044102 (3 p.). ⟨10.1063/1.3615801⟩ Applied Physics Letters, 2011, 99 (4), 044102 (3 p.). ⟨10.1063/1.3615801⟩ |
| ISSN: | 0003-6951 |
| DOI: | 10.1063/1.3615801⟩ |
| Popis: | International audience; We report on an in-situ monitoring of graphite oxidation using a high temperature environmental scanning electron microscope. A morphological transition is clearly identified around 1040 K between hexagonal pits at low temperatures and circular pits at high temperatures, with apparently no change in the kinetic law. A kinetic Monte Carlo model allows rationalizing these findings in terms of the competitive oxidation of armchair and zig-zag edge sites and provides an estimate of the rate laws associated to these two events. Extended to three dimensions, the model also explains the "in-depth" transition between the stepwise hexagons and the hemispheres observed by atomic force microscopy. |
| Databáze: | OpenAIRE |
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