Evaporation-induced cavitation in nanofluidic channels

Chuanhua Duan, Rohit Karnik, Ming-Chang Lu, Arun Majumdar*

*Corresponding author for this work

Research output: Contribution to journalArticle

68 Scopus citations

Abstract

Cavitation, known as the formation of vapor bubbles when liquids are under tension, is of great interest both in condensed matter science as well as in diverse applications such as botany, hydraulic engineering, and medicine. Although widely studied in bulk and microscale-confined liquids, cavitation in the nanoscale is generally believed to be energetically unfavorable and has never been experimentally demonstrated. Here we report evaporation-induced cavitation in water-filled hydrophilic nanochannels under enormous negative pressures up to -7 MPa. As opposed to receding menisci observed in microchannel evaporation, themenisci in nanochannels are pinned at the entrance while vapor bubbles form and expand inside. Evaporation in the channels is found to be aided by advective liquid transport, which leads to an evaporation rate that is an order ofmagnitude higher than that governed by Fickian vapor diffusion in macro- and microscale evaporation. The vapor bubbles also exhibit unusual motion as well as translational stability and symmetry, which occur because of a balance between two competing mass fluxes driven by thermocapillarity and evaporation. Our studies expand our understanding of cavitation and provide new insights for phase-change phenomena at the nanoscale.

Original languageEnglish
Pages (from-to)3688-3693
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume109
Issue number10
DOIs
StatePublished - 6 Mar 2012

Keywords

  • Bubble dynamics
  • Bubble formation
  • Confined fluids
  • Confined water
  • Nanobubbles

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