Hierarchical nanotexturing enables acoustofluidics on slippery yet sticky, flexible surfaces

Ran Tao, Glen Mchale, Julien Reboud, Jonathan M. Cooper, Hamdi Torun, Jing Ting Luo, Jikui Luo, Xin Yang, Jian Zhou, Pep Canyelles-Pericas, Qiang Wu, Yongqing Fu*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

39 Citations (Scopus)
15 Downloads (Pure)


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, while 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.

Original languageEnglish
Pages (from-to)3263-3270
Number of pages8
JournalNano letters
Issue number5
Publication statusPublished - 13 May 2020
Externally publishedYes


  • Acoustofluidics
  • Droplet transport
  • Flexible devices
  • Hierarchical nanotexture
  • Slippery surface


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