Entanglement-Controlled Subdiffusion of Nanoparticles within Concentrated Polymer Solutions
Entanglement-Controlled Subdiffusion of Nanoparticles within Concentrated Polymer Solutions
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DOI：
10.1103/physrevlett.109.055901
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发表时间：
2012-08-02
影响因子：
8.6
通讯作者：
Leheny, Robert L.
中科院分区：
文献类型：
--
作者：
Guo, Hongyu;Bourret, Gilles;Leheny, Robert L.
我们描述了X射线光子相关光谱（XPCS）实验跟踪高分子量聚苯乙烯溶液内的金纳米粒子的运动。在从纳米到几十纳米的位移，粒子经历亚扩散运动，这是由纠缠的聚合物网在粒子附近的时间演变。因此，结果提供了一种新的微观动力学表征聚合物的这种关键结构特性，更广泛地展示了基于XPCS的微观流变学在纳米结构软材料中询问异质机械环境的能力。
We describe x-ray photon correlation spectroscopy (XPCS) experiments tracking the motion of gold nanoparticles within solutions of high-molecular-weight polystyrene. Over displacements from nanometers to tens of nanometers, the particles undergo subdiffusive motion that is dictated by the temporal evolution of the entangled polymer mesh in the immediate vicinity of the particles. The results thus provide a novel microscopic dynamical characterization of this key structural property of polymers and more broadly demonstrate the capability of XPCS-based microrheology to interrogate heterogeneous mechanical environments in nanostructured soft materials.