Issue 5, 2012
From the journal:

Soft Matter

Surface energy tunable nanohairy dry adhesive by broad ion beam irradiation

Yudi Rahmawan,ab   Tae-il Kim,c   Seong Jin Kim,b   Kwang-Ryeol Lee,b   Myoung-Woon Moon*b  and  Kahp-Yang Suh*a  

* Corresponding authors

a WCU Program on Multiscale Mechanical Design, School of Mechanical and Aerospace Engineering, Seoul National University, Gwanak-1, Gwanak-ro, Gwanak-gu, Seoul, Korea
E-mail: sky4u@snu.ac.kr
Fax: +82-2-883-0179
Tel: +82-2-880-9103

b Future Convergence Research Division, Korea Institute of Science and Technology, Hwarang-ro14-gil 5, Seongbuk-gu, Seoul, Korea
E-mail: mwmoon@kist.re.kr
Fax: +82-2-958-5509
Tel: +82-2-958-5487

c 3014 Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 S Goodwin Ave, Urbana, IL, USA

Abstract

We present a simple and shape-controllable method to tune the surface energy and tilting angle of nanohairy structures using broad ion beam irradiation. First, the vertical nanohair arrays made of ultraviolet (UV)-curable polyurethane acrylate (PUA) material were prepared by replica molding. Subsequently, the nanohairs were bent to a wide range of angles from 0 (vertical) to 75° (stooped hairs) by the oblique broad Ar ion beam. The surface energy was tuned with normal oxygen (O2) ion beam irradiation together with aging effect (47.1 to 71.9 mJ m−2). It was observed that the shear adhesion strength was significantly increased from 25.2 to 58.1 N cm−2 on the hydrophilic test surface and from 22.8 to 45.7 N cm−2 on the hydrophobic test surface, respectively, with the variation of surface energy from 47.1 to 71.9 mJ m−2. In addition, the shear adhesion strength was increased from 58.1 to 124.1 N cm−2 and from 45.7 to 110.6 N cm−2 on hydrophilic and hydrophobic test surfaces, respectively, as the tilting angle was varied from 0 to 75° at the highest surface energy of 71.9 mJ m−2. The measured adhesion data were compared with the theoretical adhesion forces based on Johnson–Kendall–Roberts (JKR), modified-JKR, peel zone (PZ), and Kendall peeling models, suggesting that the contact state of nanohairs is a mixture of tip and side contacts.

Graphical abstract: Surface energy tunable nanohairy dry adhesive by broad ion beam irradiation

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Article information

DOI
https://doi.org/10.1039/C2SM06614A
Article type
Paper
Submitted
24 Aug 2011
Accepted
25 Nov 2011
First published
20 Dec 2011

Soft Matter, 2012,8, 1673-1680

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Surface energy tunable nanohairy dry adhesive by broad ion beam irradiation

Y. Rahmawan, T. Kim, S. J. Kim, K. Lee, M. Moon and K. Suh, Soft Matter, 2012, 8, 1673 DOI: 10.1039/C2SM06614A

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