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Micromachines 2017, 8(6), 190; doi:10.3390/mi8060190

Electroosmotic Flow in a Rough Nanochannel with Surface Roughness Characterized by Fractal Cantor

1
Energy and Power Engineering, School of Hydraulic, Yangzhou University, Yangzhou 225127, Jiangsu, China
2
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China
*
Author to whom correspondence should be addressed.
Received: 6 May 2017 / Revised: 7 June 2017 / Accepted: 15 June 2017 / Published: 19 June 2017
(This article belongs to the Special Issue Micro/Nano-Chip Electrokinetics, Volume II)
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Abstract

Molecular dynamics simulation is applied to study the electroosmotic flow in rough nanochannels, with particular attention given to the fluid–solid interactions. In the simulation, the surface roughness is characterized by a fractal Cantor. The roles of roughness height and fractal dimension on nanoscale electroosmotic flow are examined and analyzed. The concentration distributions, zeta potential and electroosmotic velocity are presented and investigated. The results indicate that surface roughness plays a significant role in the fluid–solid interaction and nanoscale electroosmotic flow. The distribution of dipole angle for water molecules in both the near-wall region and middle region is almost unaffected by surface roughness; however, a significant difference of dipole angle distribution is observed in the fluid region away from the wall. Interestingly, the concentration distributions, electroosmotic velocity and zeta potential are highly affected by the surface fractal dimension, even with the same roughness height. View Full-Text
Keywords: electroosmotic flow; fractal; surface; roughness electroosmotic flow; fractal; surface; roughness
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lu, P.; Liu, X.; Zhang, C. Electroosmotic Flow in a Rough Nanochannel with Surface Roughness Characterized by Fractal Cantor. Micromachines 2017, 8, 190.

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