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Issue 16, 2010
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Tilted Janus polymer pillars

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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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Publication details

The article was received on 18 Mar 2010, accepted on 28 Apr 2010 and first published on 25 Jun 2010

Article type: Paper
DOI: 10.1039/C0SM00126K
Citation: 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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