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. Author manuscript; available in PMC: 2021 Mar 29.
Published in final edited form as: ACS Appl Mater Interfaces. 2020 Dec 30;13(11):12759–12766. doi: 10.1021/acsami.0c18221

Figure 3. pH and ion responsiveness of two-way size-controllable microrollers and microscrews.

Figure 3

(a) Optical images of swelling/deswelling microrollers and microscrews in response to pH value. (b) The repetition test of the pNIPAM-AAc microrollers swelling cycles in response to pH. (c) Optical images of multiresponsiveness of microscrews in response to temperature and Ca2+ ion concentration change. (d) Repetition test of the pNIPAM-AAc microscrews shrinking/swelling cycles in response to temperature and Ca2+ ion change.