Nanoscale Fluid Transport: Size and Rate Effects

Chen, Xi; Han, Guoxin; Han, Aijie; Liu, Ling; Punyamurtula, Venkata K.; Culligan, Patricia J.; Kim, Taewan; Qiao, Yu

The transport behavior of water molecules inside a model carbon nanotube is investigated by using nonequilibrium molecular dynamcis (NMED) simulations. The shearing stress between the nanotube wall and the water molecules is identified as a key factor in determining the nanofluidic properties. Due to the effect of nanoscale confinement, the effective shearing stress is not only size sensitive but also strongly dependent on the fluid flow rate. Consequently, the nominal viscosity of the confined water decreases rapidly as the tube radius is reduced or when a faster flow rate is maintained. An infiltration experiment on a nanoporous carbon is performed to qualitatively validate these findings.



Also Published In

Nano Letters

More About This Work

Academic Units
Civil Engineering and Engineering Mechanics
Published Here
May 27, 2011


Reprinted with permission from Environmental Science & Technology. Copyright 2008 American Chemical Society.