Green Alternatives to Zinc Dialkyldithiophosphates: Vanadium Oxide-Based Additives.

Autor:	Straiton AJ; Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K., Kathyola TA; School of Chemical and Process Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K.; Diamond Light Source, Harwell Science and Innovation Campus, Fermi Ave, Didcot OX11 0DE, U.K., Sweeney C; School of Mechanical Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K., Parish JD; Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.; Infineum UK Ltd., Milton Hill Business and Technology Centre, Abingdon, Oxfordshire OX13 6BB, U.K., Willneff EA; School of Design, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K., Schroeder SLM; School of Chemical and Process Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K.; Diamond Light Source, Harwell Science and Innovation Campus, Fermi Ave, Didcot OX11 0DE, U.K., Morina A; School of Mechanical Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K., Neville A; School of Mechanical Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K., Smith JJ; Infineum UK Ltd., Milton Hill Business and Technology Centre, Abingdon, Oxfordshire OX13 6BB, U.K., Johnson AL; Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.
Jazyk:	angličtina
Zdroj:	ACS applied engineering materials [ACS Appl Eng Mater] 2023 Oct 31; Vol. 1 (11), pp. 2916-2925. Date of Electronic Publication: 2023 Oct 31 (Print Publication: 2023).
DOI:	10.1021/acsaenm.3c00425
Abstrakt:	A functionalized vanadyl(IV) acetylacetonate (acac) complex has been found to be a superior and highly effective antiwear agent, affording remarkable wear protection, compared to the current industry standard, zinc dialkyldithiophosphates (ZDDPs). Analysis of vanadium speciation and the depth profile of the active tribofilms by a combination of X-ray absorption near-edge structure (XANES), X-ray photoelectron spectroscopy (XPS), and near-edge X-ray absorption fine structure (NEXAFS) analyses indicated a mixed-valence oxide composite, comprising V(III), V(IV), and V(V) species. A marked difference in composition between the bulk and the surfaces of the tribofilms was found. The vanadyl(VI) acac precursor has the potential to reduce or even replace ZDDP, which would represent a paradigm shift in the antiwear agent design. A major benefit relative to ZDDPs is the absence of S and P moieties, eliminating the potential for forming noxious and environmentally harmful byproducts of these elements. Competing Interests: The authors declare no competing financial interest. (© 2023 The Authors. Published by American Chemical Society.)
Databáze:	MEDLINE
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