title: Permeability- and Surface-Energy-Tunable Polyurethane Acrylate Molds for Capillary Force Lithography.
abstract: A permeability- and surface-energy-controllable polyurethane acrylate (PUA) mold, a "capillary-force material (CFM)" mold, is introduced for capillary-force lithography (CFL). In CFL, the surface energy and gas permeability of the mold are crucial. However, the modulation of these two main factors at a time is difficult. Here, we introduce new CFM molds in which the surface energy and permeability can be modified by controlling the degree of cross-linking of the CFM. As the degree of cross-linking of the CFM mold increases, the surface energy and air permeability decrease. The high average functionality of the mold material makes it possible to produce patterns relatively finely and rapidly due to the high rate of capillary rise and stiffness, and the low functionality allows for patterns to form on a curved surface with conformal contact. CFMs with different functionality and controllable-interfacial properties will extend the capabilities of capillary force lithography to overcome the geometric limitations of patterning on a scale below 100 nm and micro- and nanopatterning on the curved region.
authors.affiliation: Department of Chemical Engineering, Hoseo University , Asan-si, Chungcheongnam-do 31499, Republic of Korea.
authors.forename: Dongchul
authors.initials: D
authors.lastname: Suh
authors.affiliation: Center for Neuroscience Imaging Research (CNIR), Institute for Basic Science (IBS) , Suwon 440-746, Republic of Korea.|School of Chemical Engineering, Sungkyunkwan University (SKKU) , Suwon 440-746, Korea.
authors.forename: Hyowon
authors.initials: H
authors.lastname: Tak
authors.affiliation: MCNet Company, Limited , Dangjeong-dong, Gunpo-si, Gyeonggi-do 435-030, Korea.
authors.forename: Se-jin
authors.initials: SJ
authors.lastname: Choi
authors.affiliation: Center for Neuroscience Imaging Research (CNIR), Institute for Basic Science (IBS) , Suwon 440-746, Republic of Korea.|School of Chemical Engineering, Sungkyunkwan University (SKKU) , Suwon 440-746, Korea.
authors.forename: Tae-il
authors.initials: TI
authors.lastname: Kim
keywords: capillary force lithography; degree of cross-linking; micro/nanostructure; permeability; surface energy