Bubble nucleation on nano- to micro-size cavities and posts: An experimental validation of classical theory

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Recently reported data suggest that bubble nucleation on surfaces with nano-sized features (cavities and posts) may occur close to the thermodynamic saturation temperature. However, according to the traditional theory of heterogeneous bubble nucleation, such low nucleation temperatures are possible only for surfaces with micro-scale cavities. Motivated by this apparent contradiction, we have used infrared thermometry to measure the nucleation temperature of water on custom-fabricated nano-to micro-scale cavities (from 90 nm to 4.5 mu m in diameter) and posts (from 60 nm to 5 mu m in diameter), machined on ultra-smooth and clean silicon wafers using electron beam lithography. Our cavity data are in agreement with the predictions of the Young-Laplace equation, thus re-affirming the correctness of the classic view of heterogeneous bubble nucleation, at least for the water-silicon system investigated here. The data also suggest that individual posts of any size have an insignificant effect on bubble nucleation, as expected from theory. (C) 2012 American Institute of Physics.
Publisher
AMER INST PHYSICS
Issue Date
2012-09
Language
English
Article Type
Article
Citation

JOURNAL OF APPLIED PHYSICS, v.112, no.6

ISSN
0021-8979
DOI
10.1063/1.4752758
URI
http://hdl.handle.net/10203/245597
Appears in Collection
MS-Journal Papers(저널논문)
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