Double bond conversion profiles for GOX-mediated initiation in the presence of (a) 0wt% nanoparticles, (b) 0.2 wt% of 0.02μm-diameter blue carboxylate-modified nanoparticles and (c) 0.1 wt% 0.2μm-diameter yellow/green amine-modified nanoparticles. Reactions contained 15wt% PEGDA575, 20wt% HEA, 2.5 X 10−4 M Fe+2, 6.25 X 10−7 M GOX, 4.0 X 10−4 M glucose and 10mM MES pH=4.5.