Journal
NANO LETTERS
Volume 16, Issue 10, Pages 6691-6694Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b03590
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Funding
- Revalesio Corporation
- Office of Naval Research [N000141211021]
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The Young-Laplace equation is central to the thermodynamic description of liquids with highly curved interfaces, e.g., nanoscale droplets and their inverse, nanoscale bubbles. The equation relates the pressure difference across an interface to its surface tension and radius of curvature, but the validity in using the macroscopic surface tension for describing curved interfaces with radii smaller than tens of nanometers has been questioned. Here we present electrochemical measurement of Laplace pressures within single H-2 bubbles between 7 and 200 nm radius (corresponding, respectively, to between 200 and 7 atm). Our results demonstrate a linear relationship between a bubble's Laplace pressure and its reciprocal radius, verifying the classical thermodynamic description of H-2 nanobubbles as small as similar to 10 nm.
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