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SEM images of neat Aerosil® 200 at 270× (a), 1500× (b) and 5500× (c) magnifications and 1:1 w/w mixture of Aerosil® 200 with PEG-35 castor oil (Cremophor® EL) at 270× (d), 1500× (e) and 6000× (f) magnifications. A microscope scale is shown in each image for comparison of dimensions.
