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. 2021 Apr 20;12(4):465. doi: 10.3390/mi12040465

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© 2021 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 (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) The matryoshka-ring filter for multi-filtering of particles with different sizes by changing the pH. Reproduced with permission from [85], Copyright © 2019, Royal Society of Chemistry. (b) pH-responsive actuator fabricated by dynamic asymmetric femtosecond Bessel beam. Reproduced with permission from [86], Copyright © 2020, American Chemical Society. (c) Complex 3D micro-umbrella, which can be constructed to achieve rapid, precise, and reversible articulated-lever folding by varied pH value. Reproduced with permission from [24], Copyright © 2020, Elsevier. (d) Botanical-inspired complex shape transformation and on-demand microparticle capturing. The withering process of flowers in nature. Various bending blade structures mimicking the flowers prepared with different laser power. Reproduced with permission from [87], Copyright © 2019 Wiley.