Novel design of MXene@UiO-66-NH2 hybrid nanofluids towards promoting the mechanical and tribological performance of fabric composites

The operational stability of self-lubricating fabric liners under harsh conditions faced serious challenge, and then the abrasion resistance and lubricating properties of fabric liners required further improvement urgently. Herein, the UiO-66-NH2 nanoparticles were uniformly anchored onto MXene nanosheets via electrostatic assembly to construct the 0D-2D hierarchical hybrid. Subsequently, the [email protected]2 hybrids were further functionalized by grafting KH560 corona and M2070 canopy via covalent reaction to form [email protected]2 nanofluids (NFs) with liquid-behavior. As a result, the friction and wear of PI/PTFE fabric composites presented an effective reduction with the introduction of [email protected]2 NFs. In particular, significant synergistic effect between MXene and UiO-66-NH2 was recognized during sliding process, and comprehensive characterizations indicated that the [email protected]2 NFs improved lubrication performance, load-bearing capacity and contributed to forming a robust tribofilm. Meanwhile, the innovative ionic shell structures endowed the [email protected]2 NFs with outstanding dispersion stability in resin matrix and then maximized the enhancement effects.