In Situ Crystallization and Growth Dynamics of Acentric Iron Iodate Nanocrystals in w/o Microemulsions Probed by Hyper-Rayleigh Scattering Measurements

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• 作者：Yannick Mugnier ; Latifa Houf ; Moustafa El-Kass ; Ronan Le Dantec ; Rachid Hadji ; Brice Vincent ; Gnon Djanta ; Laurent Badie ; Ce虂cile Joulaud ; Julien Eschbach ; Didier Rouxel ; Christine Galez
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：January 13, 2011
• 年：2011
• 卷：115
• 期：1
• 页码：23-30
• 全文大小：334K
• 年卷期：v.115,no.1(January 13, 2011)
• ISSN：1932-7455

文摘

A detailed experimental investigation of the formation mechanisms of acentric iron iodate [Fe(IO₃)₃] nanocrystals in AOT-based reverse micelles according to the water-in-oil (w/o) microemulsion (ME) composition and temperature was performed. A low chemical reaction rate was first demonstrated by means of UV鈭抳is absorption spectroscopy. Attainment of iron iodate crystalline nanorods was then attributed to an oriented aggregation mechanism of 10鈭?0-nm amorphous primary nanoparticles. As for the intermicellar exchange of reactants, the aggregation mechanism was also found to be determined by the ME composition because clear effects of the surfactant and reactant concentrations, the nature of the oil phase, and the water droplet size were observed. Moreover, a combination of dynamic light scattering, X-ray diffraction, and transmission electron microscopy experiments revealed that hyper-Rayleigh scattering is a fast, valuable, and nondestructive alternative to probe, in real time, the crystallization and formation dynamics of acentric nanoparticles in microemulsions. This experimental approach can be extended to studies dealing with the formation of metal nanoparticles for which scattering of second-harmonic light is readily observed.