Dynamics of Cadmium Sulfide Nanoparticles within Polystyrene Melts
Dynamics of Cadmium Sulfide Nanoparticles within Polystyrene Melts
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聚苯乙烯熔体中硫化镉纳米颗粒的动力学
DOI：
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发表时间：
2014
期刊：
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通讯作者：
S. Mochrie
中科院分区：
文献类型：
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作者：
Woo;P. Koo;K. Bryson;S. Narayanan;A. Sandy;T. Russell;S. Mochrie
我们使用 X 射线光子相关光谱法对 120 至 180 °C 温度范围内悬浮在聚苯乙烯均聚物基质中的硫化镉纳米粒子的动力学进行了详细研究。对于低分子量聚苯乙烯均聚物，观察到的动力学显示随着温度的降低，从扩散行为到超扩散行为的交叉。对于较高分子量的聚苯乙烯，纳米颗粒动力学在所有研究温度下都表现出超扩散性。根据测量的超扩散动力学确定的弛豫时间和特征速度表明，确定的活化能和潜在力分别约为 2.14 × 10–19 J 和 87 pN。
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.