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The Search for Nanobubbles by Using Specular and Off-Specular Neutron Reflectometry
Inst Laue Langevin, F-38000 Grenoble, France..
Inst Laue Langevin, F-38000 Grenoble, France.;Univ Grenoble 1, TIMC IMAG, F-38706 Grenoble, France..ORCID iD: 0000-0002-4555-3288
Inst Laue Langevin, F-38000 Grenoble, France.;Tech Univ Berlin, Dept Chem, D-10623 Berlin, Germany.;Univ Sheffield, Dept Phys & Astron, Sheffield S10 2TN, S Yorkshire, England..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
2016 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 32, no 35, 9091-9096 p.Article in journal (Refereed) Published
Abstract [en]

We apply specular and off-specular neutron reflection at the hydrophobic silicon/water interface to check for evidence of nanoscopic air bubbles whose presence is claimed after an ad hoc procedure of solvent exchange. Nanobubbles and/or a depletion layer at the hydrophobic/water interface have long been discussed and generated a plethora of controversial scientific results. By combining neutron reflectometry (NR), off-specular reflectometry (OSS), and grazing incidence small angle neutron scattering (GISANS), we studied the interface between hydrophobized silicon and heavy water before and after saturation with nitrogen gas. Our specular reflectometry results can be interpreted by assuming a submolecular sized depletion layer and the off-specular measurements show no change with nitrogen super saturated water. This picture is consistent with the assumption that, following the solvent exchange, no additional nanobubbles are introduced at significant concentrations (if present at all). Furthermore, we discuss the results in terms of the maximum surface coverage of nanobubbles that could be present on the hydrophobic surface compatibly with the sensitivity limit of these techniques.

Place, publisher, year, edition, pages
2016. Vol. 32, no 35, 9091-9096 p.
National Category
Condensed Matter Physics Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-305473DOI: 10.1021/acs.langmuir.6b02087ISI: 000382805700036PubMedID: 27516185OAI: oai:DiVA.org:uu-305473DiVA: diva2:1038547
Funder
Swedish Research Council, A0505501
Available from: 2016-10-19 Created: 2016-10-18 Last updated: 2016-10-19Bibliographically approved

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