Journal
DALTON TRANSACTIONS
Volume 46, Issue 36, Pages 12306-12312Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7dt02389h
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Funding
- National Natural Science Foundation of China [21404114, 21507139]
- Thousand Talents Program
- China Postdoctoral Science Foundation [2014 M561797]
- Natural Science Foundation of Ningbo [2015A610051, 2016A610265]
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A novel environmentally friendly bis-functional dicationic ionic liquid containing chelated orthoborate was synthesized and polycondensed with glutamic acid in order to synthesize inorganic-organic carbon dots (CD/IL) consisting of an ionic liquid moiety inserted in the carbon skeleton. The obtained CD/IL was found to be a new kind of nitrogen/boron-codoped nanomaterial, one with a mean particle diameter of 2.66 nm. CD/IL was verified to be a high-performance lubricant additive: in particular, the anti-wear and friction-reducing properties of poly(ethylene glycol) (PEG) were improved by 89.34% and 62.18%, respectively, when 1% CD/IL was added. Lubricants consisting of a mixture of CD/IL and PEG showed intense blue photo-fluorescence, and the corresponding photoluminescence (PL) intensity decreased considerably after carrying out a tribo-test. Moreover, CD/IL became transferred onto a rubbing steel interface during the tribo-test according to EDX and Raman analyses of a worn surface. CD/IL showed poor crystallinity, and interestingly, an intense G (similar to 1600 cm(-1)) signature was detected on the steel surface after a high-load and long-duration tribo-test, which indicated that ordered carbon materials were generated on the interface, inhibiting the undesirable wear.
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