Tunable wettability of polyimide films based on electrostatic self-assembly of ionic liquids

Zhao, Yan, Li, Mei and Lu, Qinghua 2008, Tunable wettability of polyimide films based on electrostatic self-assembly of ionic liquids, Langmuir, vol. 24, no. 8, pp. 3937-3943, doi: 10.1021/la703673s.

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Title Tunable wettability of polyimide films based on electrostatic self-assembly of ionic liquids
Author(s) Zhao, Yan
Li, Mei
Lu, Qinghua
Journal name Langmuir
Volume number 24
Issue number 8
Start page 3937
End page 3943
Total pages 7
Publisher American Chemical Society
Place of publication Washington, D. C.
Publication date 2008-03-11
ISSN 0743-7463
Summary We have demonstrated that the surface wettability of negatively charged polyimide films could be turned by electrostatic self-assembly of ionic liquids. The water contact angles of the polyimide films varied in the range 27-80 degrees for 13 different ionic liquids based on imidazolium and ammonium salts. The surface morphology of the resulting surfaces was characterized using atomic force microscopy. The results revealed that the assembly of longer-substituent cations was characterized by the formation of spherical nanoparticles that were formed due to sequent aggregation of cations on those electrostatically assembled ones via hydrophobic interaction. In this case, the counteranions are present in the assembled layers and the wettability is accordingly affected. Whereas for shorter-substituent cations, no aggregates were formed due to the less hydrophobic interaction than the electrostatic repulsive interaction between the cations, and the counteranions were absent from the assembled layers. This method can also be utilized to quantify the hydrophobicity of various ionic liquids.
Language eng
DOI 10.1021/la703673s
Field of Research 091209 Polymers and Plastics
100706 Nanofabrication, Growth and Self Assembly
Socio Economic Objective 970110 Expanding Knowledge in Technology
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2008, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30025916

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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