Figure 15.

(a) When the pH and/or temperature is varied the CAs reversibly change. (b) Temperature and pH dependence of water CAs for P(NIPAAm-co-AAc) thin films. Water CAs change at different temperatures for a modified substrate at pH values of 2 (□), 4 (○), 7 (▴), 9 (▼) and 11 (◊), respectively. Reprinted with permission from [46]. Copyright Wiley-VCH Verlag GmbH & Co. KGaA