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. 2021 Jun 29;4:101. doi: 10.1038/s42004-021-00538-7

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — a Set-up with solution pumped through containing [urea] = 0.12 M, [ETTMP] = 0.05 M, and [PEGDA] = 0.075 M and chemical additives. b Gel-disk formed in the reactor following removal of solution c Images to show chemical patterning of gel through addition of solution containing (i) pH indicator (ii) no indicator (iii) water-soluble oil paint and d Layered gel with (i) pH indicator, (ii) no additive and (iii) water-soluble oil paint. e Degradation of layered gel by base-catalyzed ester hydrolysis and images to show removal of layers. f Plot of the layered hydrogel diameter in time with base-catalyzed degradation in the flow reactor. Scale bars on images correspond to 10 mm.