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Effects of surfactant/water ratio and dye amount on the fluorescent silica nanoparticles

Effects of surfactant/water ratio and dye amount on the fluorescent silica nanoparticles,10.1134/S1061933X10050212,Colloid Journal,Yanhua Sun,Xian Wan

Effects of surfactant/water ratio and dye amount on the fluorescent silica nanoparticles  
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Effects of surfactant/water volume ratios and dye amounts on the properties of micelles and fluorescence silica nanoparticles were studied in microemulsions containing nonionic surfactant Triton X-100, hexanol as co-surfactant, cyclohexane as organic solvent, and metal organic dye (tris(2,2′-bipyridyl)dichlororuthenium) via fluorescence probe technique, TEM, and XPS. Fluorescence probe measurements show that the micelle microenvironment becomes stable at the surfactant/water volume ratio higher than 3.5 and the incubation time longer than 10 h. The data suggest that the silica shell, which is formed at the surfactant/water ratio of 3.5, yields an efficient protection of dye molecules against the e-beam irradiation and result in high photostability of fluorescent silica. We pioneered the localization of dye molecules on the surface of dye-doped silica and found that an increase of dye amounts, beyond a threshold, in the microemulsion cannot enhance the fluorescence intensity of dye-doped nanoparticles. These results are of significant importance for optimizing the synthesis of fluorescent nanoparticles with high photostability and low cost.
Journal: Colloid Journal - COLLOID J-ENGL TR , vol. 72, no. 5, pp. 723-729, 2010
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