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...

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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.
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description 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.
doi_str_mv 10.1063/1.1804602
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