Asymmetrical free diffusion with orientation-dependence of molecules in finite timescales
| Autor: | Sheng, Nan, Tu, Yusong, Guo, Pan, Wan, Rongzheng, Fang, Haiping |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Sci. China Phys. Mech. Astron. 56, 1047(2013) |
| Druh dokumentu: | Working Paper |
| Popis: | Using molecular dynamics simulations, we show that free diffusion of a nanoscale particle (molecule) with asymmetric structure critically depends on the orientation in a finite timescale of picoseconds to nanoseconds. In a timescale of ~100 ps, there are ~10% more possibilities for the particle moving along the initial orientation than moving opposite to the orientation; and the diffusion distances of the particle reach ~1 nm. We find that the key to this observation is the orientation-dependence of the damping force to the moving of the nanoscale particle and a finite time is required to regulate the particle orientation. This finding extends the work of Einstein to nano-world beyond random Brownian motion, thus will have a critical role in the understanding of the nanoscale world. Comment: 16 pages, 2 figures |
| Databáze: | arXiv |
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