Dynamics of Cadmium Sulfide Nanoparticles within Polystyrene Melts
- Woo-Sik Jang
- ,
- Peter Koo
- ,
- Kyle Bryson
- ,
- Suresh Narayanan
- ,
- Alec Sandy
- ,
- Thomas P. Russell
- , and
- Simon G. Mochrie
Abstract
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 °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 × 10–19 J and 87 pN, respectively.
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