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Rapid thermal characterization of graphene oxide-nanocalorimetry as a pathway for novel insights in tribology

Woll, Karsten; Neuhauser, Tobias; Acuña, C.; Diaz-Droguett, D.; Rosenkranz, A.

The use of solid lubricants such as graphene, graphene oxide, and other nanoparticles have gained notable attention in the tribological community to reduce friction and wear thus aiming at improved energy efficiency and sustainability. Tribological experiments unify rather extreme conditions such as high contact pressures, small contact areas, relative sliding motion, and rapid heating. This combination leads to mechanically- and/or thermally induced chemical, structural and microstructural modifications of the lubricating nanoparticles during rubbing thus altering their material’s properties. Due to the high sensitivity, we propose nanocalorimetry as the method of choice to shed more light on the thermally-induced processes and changes. As a model material for solid lubricants, we explore the transitions of graphene oxide under heating with 1000 °C/s up to 600 °C using quasi-adiabatic nanocalorimetry. We identify a strong exothermic runaway reaction at 317 °C. This runaway is preceded by exothermic reactions between 75–125 °C, which are correlated with the release of intercalated species and the formation of CO and CO$_{2}$.

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Verlagsausgabe §
DOI: 10.5445/IR/1000104764
Veröffentlicht am 13.01.2020
DOI: 10.3390/lubricants7110096
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Werkstoff- und Biomechanik (IAM-WBM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 2075-4442
KITopen-ID: 1000104764
Erschienen in Lubricants
Verlag MDPI
Band 7
Heft 11
Seiten Art.-Nr.: 96
Schlagwörter nanocalorimetry; carbon nanoparticles; graphene oxide; advanced materials characterization
Nachgewiesen in Scopus
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