Capillary filling speed of water in nanochannels

The capillary filling speed of water in nanochannels with a rectangular cross section and a height on the order of 100 nm has been measured over a length of 1 cm . The measured position of the meniscus as a function of time qualitatively follows the Washburn model. Quantitatively, however, there is...

Full description

Saved in:
Bibliographic Details
Published in:Applied physics letters 2004-10, Vol.85 (15), p.3274-3276
Main Authors: Tas, N. R., Haneveld, J., Jansen, H. V., Elwenspoek, M., van den Berg, A.
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The capillary filling speed of water in nanochannels with a rectangular cross section and a height on the order of 100 nm has been measured over a length of 1 cm . The measured position of the meniscus as a function of time qualitatively follows the Washburn model. Quantitatively, however, there is a lower than expected filling speed, which we attribute to the electro-viscous effect. For demineralized water in equilibrium with air the elevation of the apparent viscosity amounts up to 24 ± 11 % in the smallest channels ( 53 nm height). When using a 0.1 M NaCl (aq) solution the elevation of the apparent viscosity is significantly reduced.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1804602