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Schematic illustration of typical surface processing. (a) PDMS molds. Reproduced with permission from [75]. Copyright 2020, The Authors. (b) Natural plants. Reproduced with permission from [76]. Copyright 2014, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. (c) Salt and instant sugar as templates. Reproduced with permission from [77]. Copyright 2019, American Chemical Society.
