Capillary filling speed of water in nanochannels

Tas, N.R. and Haneveld, J. and Jansen, H.V. and Elwenspoek, M. and Berg van den, A. (2004) Capillary filling speed of water in nanochannels. Applied Physics Letters, 85 (15). pp. 3274-3276. ISSN 0003-6951

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Abstract:	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.
Item Type:	Article
Copyright:	© 2004 American Institute of Physics
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Transducers Science and Technology (TST) Biomedical and Environmental Sensor systems (BIOS)
Link to this item:	http://purl.utwente.nl/publications/55912
Official URL:	http://dx.doi.org/10.1063/1.1804602
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