Abstract
Chemistry Functionalized colloidal particles offer a versatile platform for building catalysts and sensors or for use as atomic analogs for studying packing and crystallization. However, selective asymmetric functionalization is still a challenge. Tigges et al. formed a monolayer of polystyrene particles with a surface layer of aldehyde groups. Then, using microcontact printing, they selectively modified the top of the particles by applying polymer inks containing poly(aminoethyl(meth)acrylate) homopolymers or copolymers that covalently link to the surface on amination. The polymer patches served as platforms for further functionalizing, using click-type reactions or copper-catalyzed cycloadditions, or through the inclusion of biotin in the inks for biorecognition reactions. Small 10.1002/smll.201501071 (2015).
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