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Boubekri R, Gross M, In M, et al. MHz Ultrasound Induced Roughness of Fluid Interfaces. Langmuir. 2016;32(40):10177-10183doi: 10.1021/acs.langmuir.6b02167.
Boubekri, R., Gross, M., In, M., Diat, O., Nobili, M., Möhwald, H., & Stocco, A. (2016). MHz Ultrasound Induced Roughness of Fluid Interfaces. Langmuir : the ACS journal of surfaces and colloids, 32(40), 10177-10183. https://doi.org/10.1021/acs.langmuir.6b02167
Boubekri, Rym, et al. "MHz Ultrasound Induced Roughness of Fluid Interfaces." Langmuir : the ACS journal of surfaces and colloids vol. 32,40 (2016): 10177-10183. doi: https://doi.org/10.1021/acs.langmuir.6b02167
Boubekri R, Gross M, In M, Diat O, Nobili M, Möhwald H, Stocco A. MHz Ultrasound Induced Roughness of Fluid Interfaces. Langmuir. 2016 Oct 11;32(40):10177-10183. doi: 10.1021/acs.langmuir.6b02167. Epub 2016 Sep 29. PMID: 27635785.
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Langmuir. 2016 Oct 11;32(40):10177-10183. doi: 10.1021/acs.langmuir.6b02167. Epub 2016 Sep 29.

MHz Ultrasound Induced Roughness of Fluid Interfaces.

Langmuir : the ACS journal of surfaces and colloids

Rym Boubekri, Michel Gross, Martin In, Olivier Diat, Maurizio Nobili, Helmuth Möhwald, Antonio Stocco

Affiliations

  1. Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Univ. Montpellier, Montpellier F-34095, France.
  2. Institut de Chimie Séparative de Marcoule, UMR 5257 (CEA, CNRS, UM, ENSCM), BP 17171, 30207 Cedex Bagnols-sur-Cèze, France.
  3. Max-Planck-Institute of Colloids and Interfaces , Am Mühlenberg, 14476 Potsdam, Germany.

PMID: 27635785 DOI: 10.1021/acs.langmuir.6b02167

Abstract

The interface between two fluids is never flat at the nanoscale, and this is important for transport across interfaces. In the absence of any external field, the surface roughness is due to thermally excited capillary waves possessing subnanometric amplitudes in the case of simple liquids. Here, we investigate the effect of ultrasound on the surface roughness of liquid-gas and liquid-liquid interfaces. Megahertz (MHz) frequency ultrasound was applied normal to the interface at relatively low ultrasonic pressures (<0.6 MPa), and the amplitudes of surface fluctuations have been measured by light reflectivity and ellipsometry. We found a dramatic enhancement of surface roughness, roughly linear with intensity, with vertical displacements of the interface as high as 50-100 nm. As a consequence, the effective contact area between two fluids can be increased by ultrasound. This result has a clear impact for enhancing interface based processes such as mass or heat transfer.

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