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Issue 19, 2012
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Precise tip shape transformation of nanopillars for enhanced dry adhesion strength

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Abstract

We present a simple, yet robust, technique for controlling the tip geometry of nanopillars by utilizing a two-step process of partial photopolymerization of UV-curable polyurethane acrylate (PUA) resin and subsequent tip shape modification. With this technique, head structures of nanopillars were precisely transformed from hemispherical to protruding, mushroom-like tips without any loss in structural integrity of the nanopillars. Nanoscopic and macroscopic adhesion measurements for angled nanopillars with modified tips demonstrated that mushroom-like structures fabricated by our approach could greatly enhance adhesion strengths as compared to unmodified, round head structures. Also, directional adhesion characteristics of angled nanopillars were maintained regardless of tip shapes.

Graphical abstract: Precise tip shape transformation of nanopillars for enhanced dry adhesion strength

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Article information


Submitted
22 Dec 2011
Accepted
09 Mar 2012
First published
04 Apr 2012

Soft Matter, 2012,8, 5375-5380
Article type
Paper

Precise tip shape transformation of nanopillars for enhanced dry adhesion strength

H. E. Jeong and K. Suh, Soft Matter, 2012, 8, 5375
DOI: 10.1039/C2SM07440K

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