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

College of Mechanical and Electrical Engineering

Beijing University of Chemical Technology

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

Chang Liang

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Beijing University of Chemical Technology

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

College of Mechanical and Electrical Engineering