The impregnation of a fluorescent probe [4-(hexadecylamino)-7-nitrobenz-2-oxa-1,3-diazole or NBD] into polypropylene from supercritical carbon dioxide is presented. Confocal microscopy was combined with traditional thermodynamic and spectroscopic studies to demonstrate distinct differences between supercritical fluid impregnation, solution coating, and solvent casting. The results show improved partitioning and distribution of the solute from supercritical solutions relative to conventional techniques.
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Wang et al. (2002) studied this question.
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