Nanometer-resolved collective micromeniscus oscillations through optical diffraction
| Autor: | Kazuyasu Sugiyama, Frieder Mugele, Helmut Rathgen, Detlef Lohse, Claus-Dieter Ohl |
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| Přispěvatelé: | Physics of Complex Fluids, Physics of Fluids, Faculty of Science and Technology |
| Rok vydání: | 2007 |
| Předmět: |
Materials science
Optical diffraction Field (physics) business.industry IR-58275 FOS: Physical sciences General Physics and Astronomy Resonance Time resolution Stokes flow Condensed Matter - Soft Condensed Matter Exact geometry Intensity (physics) Physics::Fluid Dynamics Optics Soft Condensed Matter (cond-mat.soft) Nanometre business METIS-242609 |
| Zdroj: | Physical review letters, 99(21):214501. American Physical Society |
| ISSN: | 0031-9007 |
| Popis: | We study the dynamics of periodic arrays of micrometer-sized liquid-gas menisci formed at superhydrophobic surfaces immersed into water. By measuring the intensity of optical diffraction peaks in real time we are able to resolve nanometer scale oscillations of the menisci with sub-microsecond time resolution. Upon driving the system with an ultrasound field at variable frequency we observe a pronounced resonance at a few hundred kHz, depending on the exact geometry. Modeling the system using the unsteady Stokes equation, we find that this low resonance frequency is caused by a collective mode of the acoustically coupled oscillating menisci. 4 pages, 5 figures |
| Databáze: | OpenAIRE |
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