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Optical microscopy images of the prepared FR-TPNP emulsions (× 400). A. Optical microscopy image of the FR-TPNP emulsion at a volume ratio of 1:2, bright dots indicate the uniform nanoparticles; B. Optical microscopy image of the FR-TPNP emulsion at a volume ratio of 1:1. The nanoparticles were not uniform, and many had oil between them. The arrow indicates an oil-like droplet.
