Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6544
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Title: Unidirectional motion of a water nanodroplet subjected to a surface energy gradient
Authors: Kou, J
Mei, M
Lu, H
Wu, F
Fan, J 
Issue Date: May-2012
Source: Physical review. E, Statistical, nonlinear, and soft matter physics, May 2012, v. 85, no. 5, 056301, p. 1-7
Abstract: We perform molecular dynamics simulations to demonstrate that when a nanodroplet is confined inside a carbon nanotube (CNT), unidirectional motion can be created by a nonzero surface energy gradient. It is found that the water nanodroplet moves along the direction of increasing surface energy. The transportation efficiency of the water nanodroplet is found to be dependent on the surface energy gradient; environmental temperature; and the flexibility, diameter, and defectiveness of the CNT. It is shown that higher surface energy gradient, the smaller diameter of the CNT, and fewer defects promote higher transportation efficiency. However, when the temperature is too high or too low, the water transport across the CNT is impeded. Except for the initial stage at the relatively low environmental temperature, higher flexibility of the CNT wall reduces the transportation efficiency. It is also found that the hydrogen bonds of water molecules play a role in the dynamic acceleration process with a wavelike feature. The present work provides insight for the development of CNT devices for applications such as drug delivery, nanopumps, chemical process control, and molecular medicine.
Publisher: American Physical Society
Journal: Physical review. E, Statistical, nonlinear, and soft matter physics 
ISSN: 1539-3755
EISSN: 1550-2376
DOI: 10.1103/PhysRevE.85.056301
Rights: Physical Review E © 2012 The American Physical Society. The Journal's web site is located at http://pre.aps.org/
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