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. 2015 Feb 6;16(2):3626–3655. doi: 10.3390/ijms16023626

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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(a) Quaternary poly(4-vinyl-2-hydroxyethyl pyridinium) chloride and poly[1-vinyl-3-(2-sulfoethyl imidazolium betaine)] with various counter anions, adapted from [148,149]; (b) [N-3(N'-n-octylimidazolio)propyl]methyl siloxane halide polymers, adapted with permission from [152].