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3D Texturing of the Water–Air Interface by Biomimetic Self-Assembly

preprint
submitted on 02.10.2019 and posted on 04.10.2019 by Erik Bergendal, Richard A. Campbell, Georgia A. Pilkington, Peter Müller-Buschbaum, Mark W. Rutland
A simple, insoluble monolayer of fatty acid is shown to induce 3D nanotexturing of the water–air interface. This advance has been achieved through the study of monolayers of a methyl-branched long chain fatty acid, analogous to those found on the surface of hair and wool, directly at the water–air interface. Specular neutron reflectometry combined with AFM probing of deposited monolayers shows pronounced 3D surface domains, which are absent for unbranched analogues and which are attributed to hydrocarbon packing constraints. The resulting surface topographies of the water far exceed the height perturbation that can be explained by the presence of capillary waves of a free liquid surface. These have hitherto been considered the only source of perturbation of the flatness of a planar water interface under gravity in the absence of topographical features from the presence of extended, globular or particulate matter. This amounts to a paradigm shift in the study of interfacial films and opens the possibility of 3D texturing of the water–air interface.

Funding

Swedish research council (VR 2013-04384)

Excellence Cluster Nanosystems Initiative Munich (NIM)

Center for NanoScience (CeNS)

History

Email Address of Submitting Author

mark@kth.se

Institution

KTH Royal Institute of Technology

Country

Sweden

ORCID For Submitting Author

0000-0002-8935-8070

Declaration of Conflict of Interest

No conflict of interest

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