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. Attached Files Name Description MIMEType Size Downloads 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 1520-5827 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 Collections: Centre for Material and Fibre Innovation GTP Research Related Links Link Description Connect to published version (restricted access) Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Fri, 26 Mar 2010, 09:18:50 EST Tue, 30 Mar 2010, 10:20:25 EST Mon, 05 Apr 2010, 13:35:21 EST Mon, 16 Jun 2014, 15:05:51 EST Wed, 25 Jun 2014, 15:25:56 EST Mon, 30 Jun 2014, 16:33:03 EST Mon, 30 Jun 2014, 16:33:51 EST Tue, 01 Jul 2014, 10:56:59 EST Thu, 11 Dec 2014, 16:33:31 EST Filtered Full Citation counts:   Cited 21 times in TR Web of Science Cited 21 times in Scopus Search Google Scholar Access Statistics: 891 Abstract Views, 1 File Downloads  -  Detailed Statistics Created: Fri, 26 Mar 2010, 09:18:50 EST