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

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.

Size-Regulated Metal–Organic Frameworks with Mercaptobenzothiazole for Ga-Based Liquid Metal Encapsulation: A High Performance Oil-Based Additive

“…Further XPS analysis was conducted on the worn surface lubricated by GLM-TA@MZ-2. As shown in Figure d, the Fe 2p 3/2 spectrum exhibits several characteristic peaks corresponding to Fe, Fe 3 O 4 , FeS, Fe 2 O 3 , and Fe­(OH)­O, appearing at 706.4, 708.3, 709.8, 712.1, and 729.8 eV, respectively. , The Ga 3d spectrum demonstrates peaks at 17.9 and 19.8 eV, indicating the presence of Ga 2 O 3 and Ga (Figure e). Additionally, the In 3d spectrum reveals prominent peaks corresponding to In and In 2 O 3 , observed at 444.5 and 452.2 eV, respectively (Figure f).…”

Mechanochemical Synthesis of Thiadiazole Functionalized COF as Oil-Based Lubricant Additive for Reducing Friction and Wear

“…First, the Thdz@COF-F nanoparticles with sufficient surface area are easy to deposit or absorb on the friction interface, repairing the pits induced by wear and forming an adsorption film . In this procedure, the iron atoms of friction pairs are positively charged after emitting electrons under friction heat and shear force, so that the electron-rich triazine and thiadiazole groups interact electrostatically with the friction pairs, contributing to the adsorption and repairing effect of Thdz@COF-F . Afterward, the COF adsorption film endures complex tribochemical reaction with the friction pair material and the air under high frequency, heavy load and local high temperature, constructing a more uniform and robust tribo-film .…”

Liquid metals nanotransformer for healthcare biosensors

“…Therefore, the higher the absolute value of the zeta potential, the more stable the colloidal solution [135] . Surfactant coverage causes changes in the zeta potential of the composite particles [136][137][138] [Figure 3B iv], so measuring the change in the zeta potential of the colloidal solution can determine whether the surfactants cover the particle surfaces and whether the NPs are stably distributed within the colloid. Not to be overlooked, surfactants also provide a steric barrier to the system to maintain colloidal stability, where they also play a key role in many solutions [130,139] .…”