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- W2079243402 abstract "Samples of formulated lubricant have been obtained from the top piston ring zone of a standard operating petrol test engine, the Petter W-1. ESR spectra of samples frozen immediately and also those allowed to stand at room temperature show a range of paramagnetic features, some of which interconvert with change in temperature and sample history. The ESR spectra of any organic radicals are absent but a ‘radical’ centre is identified as arising from amorphous carbon. In contrast, various metal centres are identified, FeIII high-spin centres decaying to low-spin FeIII centres. CII and Mn centres are also identified with hyperfine coupling to 14N and to CuII. It is argued that the hyperfine interactions from ligands to these centres may result from decomposition products of the additive pack components, for example 14N hyperfine interaction to the CuII from the nitrogen-functionalized dispersant and sulphur-centred ligands generated by the decomposition of the zinc dialkyl dithiophosphate antioxidant/anti-wear additives." @default.
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- W2079243402 date "1997-06-01" @default.
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- W2079243402 title "Paramagnetic species in engine top ring zone lubricant samples" @default.
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- W2079243402 doi "https://doi.org/10.1016/s0301-679x(96)00077-1" @default.
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