title: To adjust wetting properties of organic surface by in situ photoreaction of aromatic azide.
abstract: This article describes development of a simple and convenient method to provide stable low-surface-energy coatings on organic surfaces, by designing and synthesizing a surface-reactive molecule 4-azido-N-dodecylbenzamide, which bears an azide group as the reactive surface anchor and an alkyl chain as the hydrophobic tail. After the hydrophobic modification, rough organic surfaces with contact angle of about 0 degrees can change their surface wetting properties from superhydrophilicity to superhydrophobicity, whose contact angles are above 152 degrees and tilt angles lower than 5 degrees. Moreover, by changing the alkyl chain to a PEO segment, a similar concept can be used to adjust the surface wetting properties from hydrophobic (contact angle approximately 130 degrees) to superhydrophilic (contact angle approximately 0 degrees).
authors.affiliation: Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China.
authors.forename: Feng
authors.initials: F
authors.lastname: Shi
authors.forename: Jia
authors.initials: J
authors.lastname: Niu
authors.forename: Zan
authors.initials: Z
authors.lastname: Liu
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Wang
authors.forename: Mario
authors.initials: M
authors.lastname: Smet
authors.forename: Wim
authors.initials: W
authors.lastname: Dehaen
authors.forename: Yong
authors.initials: Y
authors.lastname: Qiu
authors.forename: Xi
authors.initials: X
authors.lastname: Zhang