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We have developed Norland Optical Adhesive (NOA) flow focusing devices,making use of the excellent solvent compatibility and surface properties of NOAto generate micron scale oil-in-water emulsions with polydispersities as low as5%. While current work on microfluidic oil-in-water emulsification largelyconcerns the production of droplets with sizes on the order of 10s ofmicrometres, large enough that Brownian motion is negligible, our NOA devicescan produce droplets with radii ranging from 2 {\mu}m to 12 {\mu}m. Todemonstrate the utility of these emulsions as colloidal model systems weproduce fluorescently labelled polydimethylsiloxane droplets suitable forparticle resolved studies with confocal microscopy. We analyse the structure ofthe resulting emulsion in 3D using coordinate tracking and the topologicalcluster classification and reveal a new mono-disperse thermal system.

Oil-in-water microfluidics on the colloidal scale: new routes to self-assembly and glassy packings