title: In situ realization of asymmetric ratchet structures within microchannels by directionally guided light transmission and their directional flow behavior.
abstract: An asymmetric ratchet structure within microchannels is demonstrated by directionally guided light transmission for controlled liquid flow. A direct and facile method is presented to realize programmed asymmetric structures, which control the fluid direction and speed.
authors.affiliation: School of Mechanical & Aerospace Engineering, Seoul National University, Seoul, 151-742, Republic of Korea; Interdisciplinary Program of Bioengineering, Seoul National University, Seoul, 151-742, Republic of Korea.
authors.forename: Won-Gyu
authors.initials: WG
authors.lastname: Bae
authors.forename: Sang Moon
authors.initials: SM
authors.lastname: Kim
authors.forename: Se-Jin
authors.initials: SJ
authors.lastname: Choi
authors.forename: Sang Geun
authors.initials: SG
authors.lastname: Oh
authors.forename: Hyunsik
authors.initials: H
authors.lastname: Yoon
authors.forename: Kookheon
authors.initials: K
authors.lastname: Char
authors.forename: Kahp Y
authors.initials: KY
authors.lastname: Suh
keywords: asymmetric structures; directional transmission; integration; lucius prism array; microchannel