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Design of weldable anisotropic cellulose multilayer hydrogels (a), POM images (taken in cross-polarized mode; A: analyzer; P: polarizer) (b) and SEM images (c) of the cross-section of 6PL, 6OL, AR, and CR multilayer hydrogels, and AFM images of the cross-section of 6PL hydrogel (d). (Reproduced with permission from [46]. Royal Society of Chemistry, 2019).
