Issue 16, 2010
From the journal:

Soft Matter

Tilted Janus polymer pillars†

Myoung-Woon Moon,a   Tae-Gon Cha,ab   Kwang-Ryeol Lee,a   Ashkan Vaziri*c  and  Ho-Young Kim*b  

* Corresponding authors

a Convergence Technology Laboratory, Korea Institute of Science and Technology, Seoul, Republic of Korea

b School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, Republic of Korea
E-mail: hyk@snu.ac.kr

c Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA, USA
E-mail: vaziri@coe.neu.edu

Abstract

Asymmetric adhesion is used by many insects and gecko lizards, allowing them to move on nearly any surface – horizontal, tilted or vertical. The feet of many of these creatures is covered with intricate fibrillar structures that are responsible for their superb manoeuvring ability. Among these creatures, gecko lizards have one of the most efficient and interesting adhesion devices consisting of finely angled arrays of branched fibers (setae). Here, we developed a method to create tilted Janus (two-face) micropillars on the surface of an elastomeric polymer to mimic the geometry of a gecko's footpad. The method combines soft lithography to create straight micropillars and ion beam irradiation to tilt the straight micropillars in a controlled fashion. A set of experiments were performed to measure the adhesion and friction characteristics of the fabricated tilted micropillars. Our experiments showed that the friction force along the tilting direction is approximately three times higher than the friction force associated with the sliding against the tilting direction of tilted micropillars due to the difference in the contact area during sliding of a glass ball.

Graphical abstract: Tilted Janus polymer pillars

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Article information

DOI
https://doi.org/10.1039/C0SM00126K
Article type
Paper
Submitted
18 Mar 2010
Accepted
28 Apr 2010
First published
25 Jun 2010

Soft Matter, 2010,6, 3924-3929

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Tilted Janus polymer pillars

M. Moon, T. Cha, K. Lee, A. Vaziri and H. Kim, Soft Matter, 2010, 6, 3924 DOI: 10.1039/C0SM00126K

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