夹心polymer刷中的纳米粒子有序化
Nanoparticle ordering in sandwiched polymer brushes
摘要：
接枝聚合物层内纳米粒子的组织由聚合物诱导的熵相互作用和外部施加的场的作用的相互作用决定。早期的工作表明，强大的外力可以驱动聚合物刷中胶体结构的形成。在这里，我们表明，外部领域是不是必不可少的，以获得这样的胶体模式：我们报告Monte Carlo和分子动力学模拟，证明有序的结构可以通过压缩“三明治”的两个接枝聚合物层，或通过挤压涂层纳米管，与纳米粒子之间。我们表明，斑图形成可以有效地控制所施加的压力，而特征长度尺度，即图案的典型宽度，是敏感的聚合物的长度。根据模拟结果，我们推导出一个近似的状态方程的纳米三明治。
英文摘要：
The organization of nano-particles inside grafted polymer layers is governed by the interplay of polymer-induced entropic interactions and the action of externally applied fields. Earlier work had shown that strong external forces can drive the formation of colloidal structures in polymer brushes. Here we show that external fields are not essential to obtain such colloidal patterns: we report Monte Carlo and Molecular dynamics simulations that demonstrate that ordered structures can be achieved by compressing a `sandwich' of two grafted polymer layers, or by squeezing a coated nanotube, with nano-particles in between. We show that the pattern formation can be efficiently controlled by the applied pressure, while the characteristic length--scale, i.e. the typical width of the patterns, is sensitive to the length of the polymers. Based on the results of the simulations, we derive an approximate equation of state for nano-sandwiches.
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