Micropatterned hydrogel stamps carrying an etchant solution are used to microstructure glass and silicon with complex architectures. A two-way reaction-diffusion mechanism enhanced by osmotic pressure gradients within the stamp enables printing of entire microdevices into solid substrates with resolution down to ~ 300 nm. The technique is applicable to other materials (e.g., ITO and GaAs) for which chemical etchants are known. In this talk, we describe printing a herringbone micromixer in one step in glass, as well as a novel, multilevel gradient diffuser printed in glass.

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