Abnormal polymer transport in crowded attractive micropost arrays.
Abnormal polymer transport in crowded attractive micropost arrays.
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DOI：
10.1039/c6sm01488g
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发表时间：
2016-09
期刊：
影响因子：
3.4
通讯作者：
Wei-Yin Chien;Yeng-Long Chen
中科院分区：
文献类型：
--
作者：
Wei-Yin Chien;Yeng-Long Chen
我们用朗之万动力学模拟研究了聚合物在准二维环境中的扩散。我们发现聚合物的扩散系数与后阵列密度之间存在非单调关系。这种扩散行为强烈地依赖于吸附-脱附转变和临界吸附强度εc。对于εεc，聚合物动力学强烈地受到后吸附的影响，我们观察到聚合物的扩散系数随着后吸附密度的增加而增加。聚合物的扩散系数达到最大值，这可以归因于大的聚合物构象涨落带来的交叉后平移。我们发现，交叉后输运和聚合物构象涨落都强烈地依赖于后吸收强度和链长。
We investigate polymer diffusion in a quasi-two-dimensional environment decorated with attractive cylindrical posts using Langevin dynamics simulation. We find that the polymer diffusivity has non-monotonic dependence on the post array density. This diffusive behavior strongly depends on the adsorption-desorption transition and the critical adsorption strength εc. For ε εc, polymer dynamics is strongly mediated by post adsorption, and we observe a regime where the polymer diffusivity increases as the post density increases. The polymer diffusivity reaches a maximum, which can be attributed to cross-post translation enabled by large polymer conformation fluctuations. We find both cross-post transport and polymer conformation fluctuations strongly depend on the post absorption strength and the chain length.