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To Adjust Wetting Properties of Organic Surface by In Situ Photoreaction of Aromatic Azide

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journal contribution
posted on 30.01.2007 by Feng Shi, Jia Niu, Zan Liu, Zhiqiang Wang, Mario Smet, Wim Dehaen, Yong Qiu, Xi Zhang
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° can change their surface wetting properties from superhydrophilicity to superhydrophobicity, whose contact angles are above 152° and tilt angles lower than 5°. 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 ∼130°) to superhydrophilic (contact angle ∼0°).