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Microscope image of porous hydrogel (image scale 500 µm): (a) hydrogel filled the spaces of the self-assembled particles and closely-packed colloidal structure; (b) porous hydrogel after the removal of the template and the microstructure of the porous hydrogel; (c) frontal view of the porous hydrogel inside the capillary channel; (d) side view of the porous hydrogel inside the capillary channel.
