PERCUTANEOUS DIFFUSION OF A HYDROPHILIC SUNSCREEN 5 Freezing • _ Liquid propane -2 :: . • •-i__'•• Liquid nitroge Fracturing /Cold knife Shadowing and replica formation Pt C Cleaning of replica Figure 1. The main steps of the freeze-fracture electron microscopy technique.
6 JOURNAL OF COSMETIC SCIENCE t I I Figure 2. Freeze-fracture electron micrographs of the simple emulsions containing acrylates/C•o_3o alkyl acrylate crosspolymer (a), polysorbate 60 (b), and poloxamer 407 (c). The scale bar indicates 0.5 iam.
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