Lihi Musbat, Hana Weitman and Benjamin Ehrenberg Azide Quenching of Singlet Oxygen in Suspensions of Microenvironments of Neutral and Surface Charged Liposomes and Micelles Photochemistry and Photobiology 89
The azide anion is a very efficient physical quencher of singlet oxygen. We show the difference in azide's quenching action when the photosensitization occurs in liposomes vs micelles, when the target molecule is water soluble or is enclosed in the apolar nanoenvironment, and when the liposome is electrically neutral or charged. We explain the observed differences on the basis of the population of sensitizer and target in the nanoenvironments, on diffusion lengths and on the effect of surface potential, by the Gouy–Chapman electrostatic theory.
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