Using molecular dynamics simulations,we show that an asymmetrically shaped nanoparticle in dilute solution possesses a spontaneously curved trajectory within a finite time interval,instead of the generally expected ra...Using molecular dynamics simulations,we show that an asymmetrically shaped nanoparticle in dilute solution possesses a spontaneously curved trajectory within a finite time interval,instead of the generally expected random walk.This unexpected dynamic behavior has a similarity to that of active matters,such as swimming bacteria,cells,or even fish,but is of a different physical origin.The key to the curved trajectory lies in the non-zero resultant force originated from the imbalance of the collision forces acted by surrounding solvent molecules on the asymmetrically shaped nanoparticle during its orientation regulation.Theoretical formulae based on microscopic observations have been derived to describe this non-zero force and the resulting motion of the asymmetrically shaped nanoparticle.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.10825520,11422542,11175230,and 11290164)the Key Research Program of the Chinese Academy of Sciences(Grant No.KJZD-EW-M03)Deepcomp7000 and ScGrid of the Supercomputing Center,the Computer Network Information Center of the Chinese Academy of Sciences, and the Shanghai Supercomputer Center of China
文摘Using molecular dynamics simulations,we show that an asymmetrically shaped nanoparticle in dilute solution possesses a spontaneously curved trajectory within a finite time interval,instead of the generally expected random walk.This unexpected dynamic behavior has a similarity to that of active matters,such as swimming bacteria,cells,or even fish,but is of a different physical origin.The key to the curved trajectory lies in the non-zero resultant force originated from the imbalance of the collision forces acted by surrounding solvent molecules on the asymmetrically shaped nanoparticle during its orientation regulation.Theoretical formulae based on microscopic observations have been derived to describe this non-zero force and the resulting motion of the asymmetrically shaped nanoparticle.
