Encapsulation of Magnetic and Fluorescent Nanoparticles in Emulsion Droplets

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• 作者：Swapan K. Mandal ; Nicolas Lequeux ; Benjamin Rotenberg ; Marc Tramier ; Jacques Fattaccioli ; Jerome Bibette ; and Benoit Dubertret
• 刊名：Langmuir
• 出版年：2005
• 出版时间：April 26, 2005
• 年：2005
• 卷：21
• 期：9
• 页码：4175 - 4179
• 全文大小：275K
• 年卷期：v.21,no.9(April 26, 2005)
• ISSN：1520-5827

文摘

Oils containing both fluorescent semiconductor and magnetic oxide nanoparticles are used to produceoil in water emulsions. This technique produces oil droplets with homogeneous fluorescence and highmagnetic nanoparticle concentrations. The optical properties of the oil droplets are studied as a functionof the droplet sizes for various concentrations of fluorescent and magnetic nanoparticles. For allconcentrations tested, we find a linear variation of the droplet fluorescent intensity as a function of thedroplet volume. For a given size and a given quantum dot (QD) concentration, the droplet fluorescenceintensity drops sharply as a function of the magnetic nanoparticle concentration. We show that this decreaseis due mainly to the strong absorption cross section of the magnetic nanoparticles and to a lesser extentto the dynamic and static quenching of the QD fluorescence. The role of the iron oxide nanoparticle localizationin the droplet (surface versus volume) is also discussed.