Surface energy tunable nanohairy dry adhesive by broad ion beam irradiation
- Surface energy tunable nanohairy dry adhesive by broad ion beam irradiation
- 유디; 김태일; 김성진; 이광렬; 문명운; 서갑양
- surface tension; tilted pillar; plasma; adhesion
- Issue Date
- Soft Matter
- VOL 8, 1673-1680
- 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.
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