. 2020 Jul 22;21(1):450–460. doi: 10.1080/14686996.2020.1783967
© 2020 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis Group.
This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 2.
Photographs of the aqueous solutions of IPUs and NIPU (1.0 mg mL–1).