Grafting Heteroelement-Rich Groups on Graphene Oxide: Tuning Polarity and Molecular Interaction with Bio-Ionic Liquid for Enhanced Lubrication
Number of Authors: 9
2017 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 498, 47-54 p.Article in journal (Refereed) Published
Two different heteroelement-rich molecules have been successfully grafted on graphene oxide (GO) sheets which were then used as lubricant additives in bio-ionic liquid. The grafting was processed with reactions between GO sheets and synthesized heteroelement-rich molecules (Imidazol-1-yl phosphonic dichloride and 1H-1,2,4-triazol-1-yl phosphonic dichloride, respectively). The modified GO (m-GO) was added into [Choline][Proline] ([CH][P]) bio-ionic liquid, and has been demonstrated effective additive in promoting lubrication. Different characterization techniques have been utilized to study the reaction between GO and the two modifiers. The effect of molecular structure of the modifiers on the rheological and tribological properties of m-GO/[CH][P] lubricants was systematically investigated. Both theoretical calculation and experimental results demonstrated that the introduced heteroelement-rich groups are beneficial to increase the robustness of lubrication film by intensified hydrogen bonding and enhance the lubricant/friction surface adhesion by increased polarity of the m-GO. As a result, the interfacial lubrication could be significantly improved by these newly developed m-GO/[CH][P] lubricants.
Place, publisher, year, edition, pages
2017. Vol. 498, 47-54 p.
Research subject Machine Elements
IdentifiersURN: urn:nbn:se:ltu:diva-62450DOI: 10.1016/j.jcis.2017.03.044OAI: oai:DiVA.org:ltu-62450DiVA: diva2:1081090
Validerad; 2017; Nivå 2; 2017-03-23 (andbra)2017-03-132017-03-132017-03-23Bibliographically approved