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Schematic diagram of hydrogel colloid synthesis by photographic method. Embossed lithography (left), lithography (middle) and flow lithography (right) are shown. The steps of optical graphics are as follows: (A) Make a template. (B) The fluid reservoir is filled with hydrogel precursor fluid. (C) Hydrogel colloid is synthesized by a synchronous mode transfer and crosslinking reaction. (D) Recovery of units from fluid reservoirs. (Reproduced with permission from the Reference [27]).
