Rahmawan, Yudi Yoon, Hyunsik Moon, Myoung-Woon Jeong, Hak-Geun Suh, Kahp-Yang 2024-01-20T10:31:38Z 2024-01-20T10:31:38Z 2021-09-04 2014-02-01 0169-4243 https://pubs.kist.re.kr/handle/201004/127116 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. English TAYLOR & FRANCIS LTD ION-BEAM IRRADIATION GECKO FOOT-HAIR ASPECT-RATIO ARRAYS LITHOGRAPHY ENERGY SETAE FABRICATION NANOHAIRS POLYMERS Janus-faced micro and nanopillars for geometry and surface chemistry controllable bioinspired dry adhesives Article 10.1080/01694243.2012.693825 1 JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY, v.28, no.3-4, pp.367 - 386 JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY 28 3-4 367 386 scie scopus 000327180800010 2-s2.0-84889678035 Engineering, Chemical Materials Science, Multidisciplinary Mechanics Engineering Materials Science Mechanics Article 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