Hierarchical nanotexturing enables acoustofluidics on slippery yet sticky, flexible surfaces

Tao, R. et al. (2020) Hierarchical nanotexturing enables acoustofluidics on slippery yet sticky, flexible surfaces. Nano Letters, 20(5), pp. 3263-3270. (doi: 10.1021/acs.nanolett.0c00005) (PMID:32233442) (PMCID:PMC7227016)

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The ability to actuate liquids remains a fundamental challenge in smart microsystems, such as those for soft robotics, where devices often need to conform to either natural or three-dimensional solid shapes, in various orientations. Here we propose a hierarchical nanotexturing of piezoelectric films as active microfluidic actuators, exploiting a unique combination of both topographical and chemical properties on flexible surfaces, whilst also introducing design concepts of shear hydrophobicity and tensile hydrophilicity. In doing so, we create nanostructured surfaces that are, at the same time, both slippery (low in-plane pinning) and sticky (high normal-to-plane liquid adhesion). By enabling fluid transportation on such arbitrarily shaped surfaces, we demonstrate efficient fluid motions on inclined, vertical, inverted, or even flexible geometries in three dimensions. Such surfaces can also be deformed and then reformed into their original shapes, thereby paving the way for advanced microfluidic applications.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Cooper, Professor Jonathan and Reboud, Professor Julien and Tao, Dr Ran
Authors: Tao, R., McHale, G., Reboud, J., Cooper, J. M., Torun, H., Luo, J., Luo, J., Yang, X., Zhou, J., Canyelles-Pericas, P., Wu, Q., and Fu, Y.
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:Nano Letters
Publisher:American Chemical Society
ISSN (Online):1530-6992
Published Online:01 April 2020
Copyright Holders:Copyright © 2020 American Chemical Society
First Published:First published in Nano Letters 2020
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
168637Advanced Diagnostics using PhononicsJonathan CooperEngineering and Physical Sciences Research Council (EPSRC)EP/K027611/1ENG - Biomedical Engineering
169832Bio-PHONONICS: Advanced Microfluidics & Diagnostics using Acoustic Holograms �` Bio-PhononicsJonathan CooperEuropean Research Council (ERC)340117ENG - Biomedical Engineering