Dynamics of Cadmium Sulfide Nanoparticles within Polystyrene Melts

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• 作者：Woo-Sik Jang ; Peter Koo ; Kyle Bryson ; Suresh Narayanan ; Alec Sandy ; Thomas P. Russell ; Simon G. Mochrie
• 刊名：Macromolecules
• 出版年：2014
• 出版时间：September 23, 2014
• 年：2014
• 卷：47
• 期：18
• 页码：6483-6490
• 全文大小：465K
• ISSN：1520-5835

文摘

We present a detailed study of the dynamics of cadmium sulfide nanoparticles suspended in polystyrene homopolymer matrices using X-ray photon correlation spectroscopy for temperatures between 120 and 180 掳C. For low molecular weight polystyrene homopolymers, the observed dynamics show a crossover from diffusive to hyper-diffusive behavior with decreasing temperatures. For higher molecular weight polystyrene, the nanoparticle dynamics appear hyper-diffusive at all temperatures studied. The relaxation time and characteristic velocity determined from the measured hyper-diffusive dynamics reveal that the activation energy and underlying forces determined are on the order of 2.14 脳 10^鈥?9 J and 87 pN, respectively.