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. 2020 Dec 30;13(11):12759–12766. doi: 10.1021/acsami.0c18221

Figure 3.

Figure 3

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