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Page 6 of 32 Zhao et al. Soft Sci 2024;4:18 https://dx.doi.org/10.20517/ss.2024.04

Figure 4. Structural design for sweat sampling in flexible sweat electronics. (A) Wearable sweatband channel for sweat collection.
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Reproduced with permission . Copyright 2017, American Chemical Society; (B) Sweatainer system for sweat collection. Reproduced
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under the terms and conditions of the CC BY . Copyright 2023, Author(s), published by The American Association for the
Advancement of Science; (C) The chamber with hydrophobic valves to reduce sweat evaporation and contamination. Reproduced with
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permission . Copyright 2020, Royal Society of Chemistry; (D) Cactus spines inspired patch with wettability patterned channels.
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Reproduced with permission . Copyright 2021, Wiley-VCH; (E) Hydrophilic fillers into the sensing channel to enhance the uptake of
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sweat. Reproduced under the terms and conditions of the CC BY . Copyright 2021, Author(s), published by Springer Nature.
wettability patterned channels inspired by cactus spines. The patch features a hierarchical microstructured/