Gelation mechanism and tribological performances of two-component cholesterol-based supramolecular gel lubricant

JY Zhang and LY Bao and QL Yu and ZF Ma and R Dong and CY Zhang and YY Bai and MR Cai and F Zhou and WM Liu, TRIBOLOGY INTERNATIONAL, 155, 106777 (2021).

DOI: 10.1016/j.triboint.2020.106777

A novel and simple method for the preparation of two-component gel lubricant and some evaluation of its physicochemical and lubricating properties are reported. The addition of two-component gelator including bis(2ethylhexyl) sulfosuccinate and cholesterol to white oil can result in self-assembly to form a gel. The gelation mechanism was characterized by the combination of atomistic molecular dynamics simulation and experiment. It not only has excellent thermal stability, but also possesses thermal reversibility, creep recovery and thixotropic properties. Noticeably, the gel can significantly enhance lubricous and AW performances of base oil. Obtained by FIB-TEM, EDS, XPS and QCM characterization, we speculate that the gelator forms an effective adsorption and tribochemical reaction film, so it can protect the contact surface from being worn.

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