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Interferometric technique for nanoscale dynamics of fluid drops on arbitrary substrates
- Source :
- Journal of Applied Physics. 118:035306
- Publication Year :
- 2015
- Publisher :
- AIP Publishing, 2015.
-
Abstract
- We demonstrate a simple interferometric probe to detect nanoscale dynamics of sessile fluid drops on arbitrary rough or flexible substrates. The technique relies on producing high-contrast Newton-ring like dynamical fringes by interference between a weak Fresnel reflection from the air-fluid interface of the drop and an air-glass interface of a convex lens placed above the drop in quasi-normal geometry. By analyzing the dynamical fringes, we observed 100–700 nm/s fluctuations in water drops evaporating on metal, leaves, insect wing, and sand paper due to their surface roughness. Similar fluctuations were also observed during spreading of non-volatile glycerin drops on various rough surfaces. Another application of the technique is demonstrated in precision measurement of change in evaporation rate of a water drop due to cooling of a metal substrate. This technique can be further miniaturized with a microscope objective with potential for wide applications.
Details
- ISSN :
- 10897550 and 00218979
- Volume :
- 118
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Physics
- Accession number :
- edsair.doi...........b0deca07ebb92ccafe9eea9c3667e1d0