Journal article
Thermochemistry of onion-like carbons
Carbon (New York), v 69, pp 490-494
Apr 2014
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The standard enthalpies of formation at 25°C of onion-like carbons (OLC) with different structural ordering have been investigated by high-temperature oxidation calorimetry. In terms of enthalpy and depending on the degree of structural ordering, OLC can be up to 16kJmol−1 less stable than graphite but up to 27kJmol−1 more stable than their fullerene allotropes. Furthermore, OLC are approximately 5–9kJmol−1 less stable than single-wall carbon nanotubes (SWCNTs). The samples prepared at 1800°C are energetically less stable than samples made at 1300 and 1500°C. These changes in energetics may stem from oxygen-containing functional groups bonded to the structure or from the creation of topological defects (polygonization and pentagon formation) whose concentration increases with increasing temperature and whose higher energy is balanced by configurational entropy.
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Details
- Title
- Thermochemistry of onion-like carbons
- Creators
- Gustavo C.C Costa - Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California Davis, One Shields Avenue, Davis, CA 95616, USAJohn K McDonough - Department of Materials Science and Engineering, A.J. Drexel Nanotechnology Institute, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104, USAYury Gogotsi - Department of Materials Science and Engineering, A.J. Drexel Nanotechnology Institute, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104, USAAlexandra Navrotsky - Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California Davis, One Shields Avenue, Davis, CA 95616, USA
- Publication Details
- Carbon (New York), v 69, pp 490-494
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000331917900052
- Scopus ID
- 2-s2.0-84892821110
- Other Identifier
- 991014969753204721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary