title: Thermal stability of superhydrophobic, nanostructured surfaces.
abstract: The thermal stability of superhydrophobic, nanostructured surfaces after thermal annealing was explored. Flat surfaces coated with hydrophobic diamond-like carbon (DLC) via plasma polymerization of hexamethyldisiloxane (HMDSO) showed a gradual decrease in the water contact angle from 90(o) to 60(o) while nanostructured surfaces maintained superhydrophobicity with more than 150° for annealing temperatures between 25 and 300°C. It was also found that surfaces with nanostructures having an aspect ratio of more than 5.2 may maintain superhydrophobicity for annealing temperatures as high as 350°C; above this temperature, however, the hydrophobicity on surfaces with lower aspect ratio nanostructures gradually degraded. It was observed that regardless of the aspect ratios of the nanostructure, all superhydrophobic surfaces became superhydrophilic after annealing at temperatures higher than 500°C.
authors.affiliation: Advanced Functional Materials Research Team, Automotive, Corporate R&D Division, Hyundai Motor Group, Republic of Korea.
authors.forename: Sung-Chul
authors.initials: SC
authors.lastname: Cha
authors.forename: Eun Kyu
authors.initials: EK
authors.lastname: Her
authors.forename: Tae-Jun
authors.initials: TJ
authors.lastname: Ko
authors.forename: Seong Jin
authors.initials: SJ
authors.lastname: Kim
authors.forename: Hyunchul
authors.initials: H
authors.lastname: Roh
authors.forename: Kwang-Ryeol
authors.initials: KR
authors.lastname: Lee
authors.forename: Kyu Hwan
authors.initials: KH
authors.lastname: Oh
authors.forename: Myoung-Woon
authors.initials: MW
authors.lastname: Moon