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The incorporation of azobenzene nanogel up to 2.5 wt.% did not impact the viscosity of the B/H/E in the absence or presence of light (A). UV-Vis spectroscopy quantifies the increasing concentration of azobenzene nanogel in the B/H/E formulations via the increased absorption observed between 300 and 450 nm (B). (Error bars denote the SD)
