期刊
CHEMICAL PHYSICS
卷 375, 期 2-3, 页码 316-326出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemphys.2010.05.019
关键词
Brownian motion; Molecular dynamics; Mori theory; Memory kernel; Fluctuating force
资金
- German Excellence Initiative via the Nanosystems Initiative Munich (NIM)
- Deutsche Forschungsgemeinschaft [HA 1517/25-2]
- Ministry of Education, Science and Technology [2010-0013812]
- National Research Foundation of Korea [2010-0013812] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Brownian motion of single particles with various masses M and diameters D is studied by molecular dynamics simulations. Besides the momentum auto-correlation function of the Brownian particle the memory function and the fluctuating force which enter the generalized Langevin equation of the Brownian particle are determined and their dependence on mass and diameter are investigated for two different fluid densities. Deviations of the fluctuating force distribution from a Gaussian form are observed for small particle diameters. For heavy particles the deviations of the fluctuating force from the total force acting on the Brownian particle decrease linearly with the mass ratio m/M where m denotes the mass of a fluid particle. (C) 2010 Elsevier B. V. All rights reserved.
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