Effects of polyacrylic acid molecular weights on V2C-MXene nanocoatings for obtaining ultralow friction and ultralow wear in an ambient working environment. Issue 44 (4th November 2022)

• Record Type: Journal Article
• Authors: Yin, Xuan; Chen, Haohao; Jiang, Lai; Liang, Chang; Pang, Haosheng; Liu, Dameng; Zhang, Bing
• Is Part Of: Physical chemistry chemical physics. Volume 24:Issue 44(2022)
• Page Start: 27406
• Page End: 27412
• Publication Date: 2022-11-04
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/d2cp03639h
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : Ultralow friction ( μ ≈ 0.073 ± 0.024) is achieved for the LPAA@V2 C vs. steel ball system through tribo-physicochemical interactions. Abstract : Two modified V2 C-MXene nanocoatings are prepared through different molecular weights of polyacrylic acid (polyacrylic acid with ∼4 50 000 is marked as LPAA, and polyacrylic acid with ∼4 000 000 is marked as HPAA) and two-dimensional V2 C-MXene. Their properties are characterized using a ball-on-disc tribometer, three-dimensional white-light interferometry topography images, optical microscope, Raman spectrometer, focused ion beam/scanning electron microscope and high-resolution transmission electron microscope/energy dispersive X-ray spectrometer (HRTEM/EDS). As a result, an ultralow friction ( μ ≈ 0.073 ± 0.024) and an ultralow wear (3.41 × 10 −7 mm 3 N −1 m −1 for ball scar, and 7.49 × 10 −8 mm 3 N −1 m −1 for disc track) are achieved for the LPAA@V2 C vs. steel ball system tested under 4 N in the air through tribo-physicochemical interactions. During the rubbing process, the LPAA@V2 C nanocoating is transferred onto counter-bodies to form mixed-phase lubricative tribofilms. Monitoring via a HRTEM/EDS, the mixed-phase lubricative tribofilms are found to be mainly composed of amorphous carbon phases containing O and V and layered nano-debris along the sliding surface. The tribofilm's stable structure is the key to realizing ultralow friction and ultralow wear through the LPAA modification. These findings disclose that MXene-based nanomaterials can be applied for material engineering and mechanical engineering under common working conditions.