Journal
ACS APPLIED NANO MATERIALS
Volume 3, Issue 10, Pages 10115-10122Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c02092
Keywords
gallium-based liquid metal; lubricant additives; surface modification; antiwear; friction reduction
Funding
- National Key Research and Development Program of China [2018YFB0703802]
- NSFC [51972272]
- Fundamental Research Funds for the Central Universities [G2018KY0302, 31020180QD132]
- Natural Science Foundation of Shaanxi [2020JM-090]
- China Postdoctoral Science Foundation [2018M641014]
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The escalation in industrial demand and environmental concerns has necessitated the development of high-performance nanoadditives-the driving force behind advanced lubricating oil used in engineered systems. Herein, dialkyl dithiophosphate (DDP)-functionalized gallium-based liquid-metal (GLM) nanodroplets-DDP@GLMs, were prepared with an average size of about 178 nm and used as effective lubricant additives for tribological properties such as friction and wear reduction. Polydopamine-coated GLM nanodroplets (PDA@GLMs) can simply be prepared by means of sonication of liquid metal in bulk in Tris aqueous solution of dopamine, followed by modification by a commercial lubricating additive (DDP) via Michael addition. The DDP@GLMs exhibited exceptional stability in poly(alphaolefin) (PAO) base oil and remained stable for more than 5 days. The tribological properties of DDP@GLM additives were evaluated under varied conditions. It can be seen that the asobtained DDP@GLMs demonstrated remarkable friction reduction and wear resistance abilities while operating as lubricating additives. The high load-carrying property is seen reaching a value as high as 1050 N with the frictional coefficient befalling less than 0.1 and the corresponding wear volume loss being decreased by 96%. The tribological properties seem attributable to the formation of a protective film (oxides of Ga, In, Fe, ferrous sulfide, and iron phosphate) on the interfaces of friction pairs. This study establishes a reliable basis for simple preparation of functional GLM nanodroplets and the manner of their implementation as lubrication additives.
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