Institut Charles Sadron, CNRS UPR 22, Université de Strasbourg, 23 rue du Loess, 67034 Strasbourg, France.
Phys Rev Lett. 2012 Dec 14;109(24):248304. doi: 10.1103/PhysRevLett.109.248304.
The dynamics in polymer monolayers where chains are strongly confined and adopt 2D conformations are drastically different to those in the bulk. It is shown that viscoelastic hydrodynamic interactions play a major role defining the anomalous chain diffusion properties in such systems where chains cannot cross each other. We developed a quantitative analytical theory of polymer subdiffusion in 2D systems revealing a complex behavior controlled by a delicate interplay of inertial, viscoelastic hydrodynamic interactions, finite-box-size and frictional effects. The theory is fully supported by extensive momentum-conserving and Langevin molecular-dynamics simulation data explaining the highly cooperative character of 2D polymer motions.
在聚合物单层中，当链受到强烈限制并采用 2D 构象时，其动力学行为与本体中的动力学行为有很大的不同。研究表明，粘弹流体动力学相互作用在定义此类系统中链不能相互交叉的异常链扩散性质方面起着重要作用。我们开发了一种定量分析二维系统中聚合物亚扩散的理论，揭示了由惯性、粘弹流体动力学相互作用、有限盒尺寸和摩擦效应的微妙相互作用控制的复杂行为。该理论得到了广泛的动量守恒和 Langevin分子动力学模拟数据的充分支持，这些数据解释了二维聚合物运动的高度协同性。
