Janus-faced micro and nanopillars for geometry and surface chemistry controllable bioinspired dry adhesives

Authors
Rahmawan, YudiYoon, HyunsikMoon, Myoung-WoonJeong, Hak-GeunSuh, Kahp-Yang
Issue Date
2014-02-01
Publisher
TAYLOR & FRANCIS LTD
Citation
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY, v.28, no.3-4, pp.367 - 386
Abstract
Janus-faced pillar structures are a new class of bioinspired dry adhesives based on the exploitation of unique physical and chemical properties when two different materials are placed on two opposite faces. Using Janus-faced high aspect ratio (HAR) pillars, it is possible to control the geometry and surface chemistry that are key factors in designing gecko-inspired artificial dry adhesives with high performance. In this review, first, we revisit the conventional fabrication techniques for homogeneous, angled HAR structures. Second, we present the fabrication methods for Janus-faced micro and nanopillars via physical and chemical modification of one of the faces. Third, we discuss the geometric features of Janus-faced structures with bending mechanisms of the pillars and the selection of contacting faces. Finally, we cover the theoretical and practical viewpoints of adhesion behavior with a particular focus on the role of work of adhesion, tilt angle, and adhesion hysteresis. We emphasize that Janus-faced structures potentially provide powerful systems to control anisotropic adhesion behavior by taking advantage of both physical and chemical aspects of the angled structures.
Keywords
ION-BEAM IRRADIATION; GECKO FOOT-HAIR; ASPECT-RATIO; ARRAYS; LITHOGRAPHY; ENERGY; SETAE; FABRICATION; NANOHAIRS; POLYMERS; ION-BEAM IRRADIATION; GECKO FOOT-HAIR; ASPECT-RATIO; ARRAYS; LITHOGRAPHY; ENERGY; SETAE; FABRICATION; NANOHAIRS; POLYMERS; Janus-faced structures; angled nanopillars; dry adhesion; e-beam irradiation; ion beam irradiation; oblique metal deposition; surface energy; adhesion hysteresis
ISSN
0169-4243
URI
https://pubs.kist.re.kr/handle/201004/127116
DOI
10.1080/01694243.2012.693825
Appears in Collections:
KIST Article > 2014
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