Effects of polyacrylic acid molecular weights on V₂C-MXene nanocoatings for obtaining ultralow friction and ultralow wear in an ambient working environment

Abstract

A series of modified V2C-MXene nanocoating is prepared through different molecular weights of polyacrylic acid (polyacrylic acid for ~450,000 marked as LPAA, and polyacrylic acid for ~4,000,000 marked as HPAA)...

Lubrication mechanism of polyimide/V2CTx MXene composites based on surface chemistry

“…This indicated that the Al layer was removed during the etching process. New diffraction peaks appeared at 7.42 (002), 24.89 (006), and 35.55 (021), indicating that most of the V 2 AlC has been converted into V 2 CT x MXene. SEM images show that V 2 AlC shows a 3D structure with tight interlayer stacking.…”

“…Before the tribological tests, the steel balls (GCr15, diameter = 4 mm, Yiwu Hongzhou Trading Co., Ltd.) were thoroughly cleaned with ethanol in an ultrasonic bath for 30 min and the tribological tests were carried out at 50 r/min. Referring to previous experience, 24 the duration of each test is 30 min and the test is repeated at least 3 times under each condition. The COF during sliding was recorded online.…”

Self-Lubricating and Self-Healing Polyurethane Nanocomposites Based on Aminated-Ti3C2Tx

“…Grafting amino groups (−NH 2 ) on the Ti 3 C 2 T x surface is a simple and effective method to promote the interaction between Ti 3 C 2 T x and the matrix material interface. 38 For example, the research group led by Professor Xiaoqiang Fan 39 from Southwest Jiaotong University modified Ti 3 C 2 T x using 3aminopropyltriethoxysilane (APTES) to prepare aminofunctionalized Ti 3 C 2 T x (f-Ti 3 C 2 ), which was then compounded with waterborne epoxy resin (EP) to obtain f-Ti 3 C 2 /EP composite film materials. The study showed that due to the interaction between amino and epoxy groups, f-Ti 3 C 2 could maintain a uniform and stable state in the epoxy resin slurry for 30 days, and the composite film material with 0.5 wt % f-Ti 3 C 2 had the best tribological performance, with an average friction coefficient of 0.357 and a wear rate of 1.93 × 10 −4 mm 3 /(Nm).…”

“…Studies have shown that the functional modification of Ti 3 C 2 T x by adjusting the surface terminal functional groups can promote its interaction with the polymer matrix interface. Grafting amino groups (−NH 2 ) on the Ti 3 C 2 T x surface is a simple and effective method to promote the interaction between Ti 3 C 2 T x and the matrix material interface . For example, the research group led by Professor Xiaoqiang Fan from Southwest Jiaotong University modified Ti 3 C 2 T x using 3-aminopropyltriethoxysilane (APTES) to prepare amino-functionalized Ti 3 C 2 T x (f-Ti 3 C 2 ), which was then compounded with waterborne epoxy resin (EP) to obtain f-Ti 3 C 2 /EP composite film materials.…”