Detection of Nanobubbles on Lubricant-Infused Surfaces Using AFM Meniscus Force Measurements
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Open Access
Type
ArticleAbstract
So far, the presence of nanobubbles on lubricant-infused
surfaces (LIS) has been overlooked, because of the difficulty
in detecting them in such a complex system. We recently showed that
anomalously large interfacial slip measured on LIS is explained by the
presence of nanobubbles ...
See moreSo far, the presence of nanobubbles on lubricant-infused surfaces (LIS) has been overlooked, because of the difficulty in detecting them in such a complex system. We recently showed that anomalously large interfacial slip measured on LIS is explained by the presence of nanobubbles [Vega-Sánchez, Peppou-Chapman, Zhu and Neto, Nat. Commun., 2022 13, 351]. Crucial to drawing this conclusion was the use of atomic force microscopy (AFM) force− distance spectroscopy (meniscus force measurements) to directly image nanobubbles on LIS. This technique provided vital direct evidence of the spontaneous nucleation of nanobubbles on lubricantinfused hydrophobic surfaces. In this paper, we describe in detail the data collection and analysis of AFM meniscus force measurements on LIS and show how these powerful measurements can quantify both the thickness and distribution of multiple coexisting fluid layers (i.e., gas and oil) over a nanostructured surface. Using this technique, thousands of force curves were automatically analyzed. The results show that the interfacial tension of the nanobubbles is reduced from 52 ± 9 mN m−1 to 39 ± 4 mN m−1 by the presence of the silicone oil layer.
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See moreSo far, the presence of nanobubbles on lubricant-infused surfaces (LIS) has been overlooked, because of the difficulty in detecting them in such a complex system. We recently showed that anomalously large interfacial slip measured on LIS is explained by the presence of nanobubbles [Vega-Sánchez, Peppou-Chapman, Zhu and Neto, Nat. Commun., 2022 13, 351]. Crucial to drawing this conclusion was the use of atomic force microscopy (AFM) force− distance spectroscopy (meniscus force measurements) to directly image nanobubbles on LIS. This technique provided vital direct evidence of the spontaneous nucleation of nanobubbles on lubricantinfused hydrophobic surfaces. In this paper, we describe in detail the data collection and analysis of AFM meniscus force measurements on LIS and show how these powerful measurements can quantify both the thickness and distribution of multiple coexisting fluid layers (i.e., gas and oil) over a nanostructured surface. Using this technique, thousands of force curves were automatically analyzed. The results show that the interfacial tension of the nanobubbles is reduced from 52 ± 9 mN m−1 to 39 ± 4 mN m−1 by the presence of the silicone oil layer.
See less
Date
2022Source title
LangmuirVolume
38Publisher
ACSFunding information
ARC FT180100214Rights statement
Copyright © 2022 American Chemical SocietyFaculty/School
Faculty of Science, School of ChemistryThe University of Sydney Multidisciplinary Centres and Institutes , The University of Sydney Nano Institute
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