Abstract
Recently, MXenes, due to their abundant advantages, have been widely applied in energy storage, separation, catalysis, biosensing, et al. In this study, parallel tempering Monte Carlo and molecular dynamics methods were performed to investigate lysozyme adsorption on different functionalized Ti3C2Tx (-O, -OH, and -F). The simulation results show that lysozyme can adsorb effectively on Ti3C2Tx surfaces, and the order of interaction strength is Ti3C2O2 > Ti3C2F2 > Ti3C2(OH)2. Electrostatics together with van der Waals interactions control protein adsorption. The orientation distributions of lysozyme adsorbed on the Ti3C2O2 and Ti3C2F2 surfaces are more concentrated than that on the Ti3C2(OH)2 surface. During adsorption, the conformation of lysozyme remains stable, suggesting the good biocompatibility of Ti3C2Tx. Besides, the distribution of the interfacial water layer on the Ti3C2Tx surface has a certain impact on protein adsorption. This study provides theoretical insights for understanding the biocompatibility of 2D Ti3C2Tx materials and may help us evaluate the engineering of their surfaces for future biorelated applications.
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