title: A rapid one-step fabrication of patternable superhydrophobic surfaces driven by Marangoni instability.
abstract: We present a facile and inexpensive approach without any fluorinated chemistry to create superhydrophobic surface with exceptional liquid repellency, transportation of oil, selective capture of oil, optical bar code, and self-cleaning. Here we show experimentally that the control of evaporation is important and can be used to form superhydrophobic surface driven by Marangoni instability: the method involves in-situ photopolymerization in the presence of a volatile solvent and porous PDMS cover to afford superhydrophobic surfaces with the desired combination of micro- and nanoscale roughness. The porous PDMS cover significantly affects Marangoni convection of coating fluid, inducing composition gradients at the same time. In addition, the change of concentration of ethanol is able to produce versatile surfaces from hydrophilic to superhydrophobic and as a consequence to determine contact angles as well as roughness factors. In conclusion, the control of evaporation under the polymerization provides a convenient parameter to fabricate the superhydrophobic surface, without application of fluorinated chemistry and the elegant nanofabrication technique.
authors.affiliation: Department of Chemical Engineering, Chungnam National University , Yuseong-gu, Daejeon 305-764, South Korea.
authors.forename: Sung-Min
authors.initials: SM
authors.lastname: Kang
authors.forename: Sora
authors.initials: S
authors.lastname: Hwang
authors.forename: Si-Hyung
authors.initials: SH
authors.lastname: Jin
authors.forename: Chang-Hyung
authors.initials: CH
authors.lastname: Choi
authors.forename: Jongmin
authors.initials: J
authors.lastname: Kim
authors.forename: Bum Jun
authors.initials: BJ
authors.lastname: Park
authors.forename: Daeyeon
authors.initials: D
authors.lastname: Lee
authors.forename: Chang-Soo
authors.initials: CS
authors.lastname: Lee
mesh_terms: D057927:Hydrophobic and Hydrophilic Interactions; D013499:Surface Properties; D017155:Wettability