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Your search keyword '"He, Baoluo"' showing total 32 results
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32 results on '"He, Baoluo"'

27. Thiadiazole Dimer-Functionalized Liquid Metal Nanoparticles for Anti-Corrosion and Friction Reduction.

Author

Wang, Peng, Xie, Huijie, Guo, Fuqiao, He, Baoluo, Wang, Xianzong, Liu, Shujuan, Ye, Qian, and Liu, Weimin

Abstract

Thiadiazole compounds and their derivatives have good carrying capacity and lubricating properties. Herein, polydopamine can be in situ self-assembled onto gallium-based liquid metal (GLM) nanoparticles via ultrasound treatment of bulk GLM nanoparticles in dopamine-containing Tris aqueous solution followed by covalent bonding with a thiadiazole dimer (DMCT) through Michael addition reactions. The as-prepared thiadiazole dimer-functionalized liquid metal (GLM-DMCT) nanoparticles, with an average particle size of 380 nm, can be used as nanoadditives in the base oil (500SN). The tribological properties of GLM-DMCT as additives were evaluated under various loads, temperatures, and frequencies, and the results showed that GLM-DMCT additives have improved anti-friction and anti-wear performances of 500SN. The coefficient of friction can be reduced to 0.092 from 0.147 after adding 2 wt % GLM-DMCT, the wear volume reduces by 89.7%, and the load-carrying capacity is increased from 150 to 1050 N. The improved tribological performance is credited to the formation of a stable, protective layer on the friction pair via the complex tribo-chemical reaction of Ga, In, and S elements of GLM-DMCT. Furthermore, the as-prepared GLM-DMCT exhibits good anti-corrosion performance, which is attributed to the breaking of the disulfide bond of DMCT, releasing the corrosion inhibitor DMTD during the corrosion process. [ABSTRACT FROM AUTHOR]

Published
2023
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32. Electrochemically Mediated Surface-Initiated Atom Transfer Radical Polymerization by ppm of Cu II /Tris(2-pyridylmethyl)amine.

Author

Guo T, He B, Mu R, Li J, Sun C, Wang R, Zhang G, Sheng W, Yu B, and Li B

Abstract

Atom transfer radical polymerization (ATRP) is one of the most widely used methods for modifying surfaces with functional polymer films and has received considerable attention in recent years. Here, we report an electrochemically mediated surface-initiated ATRP to graft polymer brushes onto solid substrates catalyzed by ppm amounts of Cu II /TPMA in water/MeOH solution. We systematically investigated the type and concentrations of copper/ligand and applied potentials correlated to the polymerization kinetics and polymer brush thickness. Gradient polymer brushes and various types of polymer brushes are prepared. Block copolymerization of 2-hydroxyethyl methacrylate (HEMA) and 3-sulfopropyl methacrylate potassium salt (PSPMA) (poly(HEMA- b -SPMA)) with ultralow ppm eATRP indicates the remarkable preservation of chain end functionality and a pronounced "living" characteristic feature of ppm-level eATRP in aqueous solution for surface polymerization.

Published
2024
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