biomechanical-analysis-adjacent-segments-after-spinal-fusion-surgery

Biomechanical Analysis of Adjacent Segments after Spinal Fusion Surgery Using a Geometrically Parametric Patient-Specific Finite Element Model

This study aimed to perform a mechanical analysis of adjacent segments after spinal fusion surgery using a geometrically parametric patient-specific ...

Beijing University of Chemical Technology

Two modified VC-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 VC-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 ( ≈ 0.073 ± 0.024) and an ultralow wear (3.41 × 10 mm N m for ball scar, and 7.49 × 10 mm N m for disc track) are achieved for the LPAA@VC  steel ball system tested under 4 N in the air through tribo-physicochemical interactions. During the rubbing process, the LPAA@VC nanocoating is transferred onto counter-bodies to form mixed-phase lubricative tribofilms. Monitoring  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.

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

Chang Liang

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