Sprakel Joris, van der Gucht Jasper, Cohen Stuart Martien A, Besseling Nicolaas A M
Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands.
Phys Rev Lett. 2007 Nov 16;99(20):208301. doi: 10.1103/PhysRevLett.99.208301. Epub 2007 Nov 15.
We present experimental evidence of a transition in the short-time Brownian motion of colloids from diffusive to subdiffusive, Rouse-like. This transition is seen for particles that are bound, through physical adsorption, to transient polymer networks. The characteristic Rouse scaling of the mean square particle displacement with radical t, found in the experiments, is rationalized using an analytical bead-spring model of a large particle anchored to a set of polymer chains.
我们展示了胶体在短时间布朗运动中从扩散型转变为类Rouse亚扩散型的实验证据。这种转变在通过物理吸附与瞬态聚合物网络结合的粒子中可见。实验中发现的平均平方粒子位移随根号t的特征Rouse标度，通过一个将大粒子锚定在一组聚合物链上的解析珠簧模型得到了合理的解释。
