Capillarity Induced Negative Pressure of Water Plugs in Nanochannels

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Abstract

This is a very interesting article. In this article, the authors focused on fluidic behavior in the nano-scale and discovered interesting phenomeons. From conducting experiment, the authors found evidence that water plugs in hydrophilic nanochannels can be at significant negative pressure due to tensile capillary forces. All in all, the negative pressure of water plugs in nanochannels induces bending of the thin channel capping layer, which results in a visible curvature of the liquid meniscus. The authors did detailed analysis of the meniscus curvature and calculated the amount of bending of the channel to determine the negative pressure of the liquid. In their experiment, for water plugs in silicon oxide nanochannels of 108 nm height, a negative pressure of 17 ± 10 bar was found. Last but not least, the authors used scaling analysis of capillarity induced negative pressure, and showed that absence of cavitation is also expected at other channel heights.

Experiment

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