S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Industrial Engineering (산업공학과) Journal Papers (저널논문_산업공학과)
Tilted Janus polymer pillars
- Moon, Myoung-Woon; Cha, Tae-Gon; Vaziri, Ashkan; Lee, Kwang-Ryeol; Kim, Ho-Young
- Issue Date
- ROYAL SOC CHEMISTRY
- SOFT MATTER; Vol.6 16; 3924-3929
- 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.
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