缺陷、波纹和温度调控石墨烯涂层上的稀薄空气阻力
Defects, Corrugation and Temperature Govern Rarefied-Air Drag on Graphene Coatings
AI总结：
通过分子动力学模拟，研究石墨烯涂层对α-Al2O3(0001)表面氮气切向动量适应系数（TMAC）的影响，发现其能降低阻力，且效果随温度升高而增强，缺陷密度在实验相关范围内不影响性能。
摘要：
在稀薄大气环境中，连续流体动力学失效，气动阻力由气体-表面动量交换控制，使表面结构和化学成为关键设计参数。利用分子动力学模拟，我们表明在α-Al2O3(0001)表面涂覆石墨烯可显著降低N2的切向动量适应系数（TMAC），使散射向更镜面反射转变，从而降低阻力；我们进一步将此响应与石墨进行对比。这种降低效果在高达900 K时增强。虽然结构缺陷可通过缺陷诱导的波纹以及局部原子和电子重排增加TMAC，但在实验相关的缺陷密度下，石墨烯仍保持其性能。
英文摘要：
In rarefied atmospheric environments, where continuum fluid dynamics breaks down, aerodynamic drag is governed by gas-surface momentum exchange, making surface structure and chemistry key design knobs. Using molecular dynamics simulations, we show that coating the $α$-Al2O3(0001) surface with graphene markedly reduces the tangential momentum accommodation coefficient (TMAC) of N2, shifting scattering toward more specular reflection and thereby lowering drag; we further benchmark this response against graphite. The reduction strengthens up to 900 K. While structural defects can increase TMAC via defect-induced corrugation and local atomic and electronic rearrangements, graphene retains its performance at experimentally relevant defect densities.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
