Hwang, Myonghoo Kim, Changho Kim, Jinwoo Son, Jeong Gon Yeom, Bongjun 2024-01-19T19:34:41Z 2024-01-19T19:34:41Z 2021-09-02 2019-07 1616-301X https://pubs.kist.re.kr/handle/201004/119855 Nano- and microsized chiral materials are receiving significant attention because of their unique characteristics, which include chiroptical activities and enantioselective interactions with living materials. However, the realization of chiral morphologies in such small-scale materials has been an issue because of the complicated fabrication methods and limited material selection. In this study, a facile and reproducible method is developed for fabricating 3D chiral microwrinkles with twisted shapes by asymmetric and biaxial buckling. Soft polydimethylsiloxane (PDMS) substrates are asymmetrically stretched with angled biaxial strains and exposed to UV/ozone to prepare hard silica layers on top of the PDMS substrates to induce microwrinkles. The chiral shapes are controlled by changing the angle (theta) between the two strain axes and the UV/ozone exposure times (t(1), t(2)) in each stage of buckling. The 3D chiral microwrinkles are shaped like "fusilli pasta" and occupy an area of 1.5 cm x 1.5 cm. The patterned area can be easily scaled, and no innate chiral biomaterial is necessary. This method could be widely extended to the fabrication of diverse types of chiral materials for advanced optical and bio-applications. English WILEY-V C H VERLAG GMBH THIN-FILM PATTERNS SURFACE MICROSTRUCTURES SILICON Controlled Fabrication of 3D Chiral Microwrinkles via Asymmetrical and Biaxial Bucklings Article 10.1002/adfm.201808979 1 ADVANCED FUNCTIONAL MATERIALS, v.29, no.29 ADVANCED FUNCTIONAL MATERIALS 29 29 scie scopus 000478629500027 2-s2.0-85064165691 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article THIN-FILM PATTERNS SURFACE MICROSTRUCTURES SILICON bucklings chirality handedness microwrinkles