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

Content Provider	Royal Society of Chemistry (RSC)
Author	Kim, Seong Jin Kim, Tae-il Lee, Kwang-Ryeol Rahmawan, Yudi Suh, Kahp-Yang Moon, Myoung-Woon
Copyright Year	2012
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.
Starting Page	1673
Ending Page	1680
Page Count	8
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	8
Issue Number	5
Journal	Soft Matter
DOI	10.1039/c2sm06614a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Province of Potenza Oxygen Johnson Polyurethane Acrylate Kendall Ion Hydrophile Hydrophobe Roberts Ultraviolet Surface energy
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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