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American Institute of Physics, Biomicrofluidics, 2(5), p. 021103

DOI: 10.1063/1.3602858

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Capillary flow in sacrificially etched nanochannels

Journal article published in 2011 by Mark N. Hamblin, Aaron R. Hawkins ORCID, Dallin Murray, Daniel Maynes, Milton L. Lee, Adam T. Woolley, H. Dennis Tolley, H. Dennis Tolley
This paper is available in a repository.
This paper is available in a repository.

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Abstract

Planar nanochannels are fabricated using sacrificial etching technology with sacrificial cores consisting of aluminum, chromium, and germanium, with heights ranging from 18 to 98 nm. Transient filling via capillary action is compared against the Washburn equation [E. W. Washburn, Phys. Rev. 17, 273 (1921)], showing experimental filling speeds significantly lower than classical continuum theory predicts. Departure from theory is expressed in terms of a varying dynamic contact angle, reaching values as high as 83° in channels with heights of 18 nm. The dynamic contact angle varies significantly from the macroscopic contact angle and increases with decreasing channel dimensions.