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Synthesis and tribological characterization of stable dispersions of thermally reduced graphite oxide

: Schlüter, B.; Mülhaupt, R.; Kailer, A.

Preprint urn:nbn:de:0011-n-2872793 (457 KByte PDF)
MD5 Fingerprint: f03edbeeba8eeee0d621cf6f610d687d
Created on: 5.12.2014

Tribology letters 53 (2014), No.1, pp.353-363
ISSN: 1023-8883
Bundesministerium für Bildung und Forschung BMBF
03X0111C; FUNgraphen
Journal Article, Electronic Publication
Fraunhofer IWM ()
thermally reduced graphite oxide; functionalized graphene; graphene dispersions; dispersion stability tests; tribology; wear; friction coefficient

Novel dispersions of thermally reduced graphite oxide (TRGO) in ester oil were prepared by means of high-pressure homogenization. Due to the versatility of the homogenization process, TRGO dispersions with a wide concentration range of 0.01–0.5 wt% could be prepared both in ester oil that contains additives (FGL46 E) and in an additive-free ester oil formulation. The obtained dispersions were characterized with respect to their sedimentation stability and their tribological properties. Therefore, highly resolved Stribeck curves were measured in the boundary region. Compared to benchmark dispersions of carbon black and graphite, our TRGO-containing formulations showed considerably lower friction and wear. The results of this study show the positive influence of TRGO on the friction behavior of ester oil formulations, thereby presenting TRGO-containing ester oils as a promising new family of liquid-based lubricants.