聚合物在纳米通道中的分级分离：微结构和微结构的综合影响
Fractional Separation of Polymers in Nanochannels: Combined Influence of Wettability and Structure
摘要：
在纳米孔中捕获大分子在聚合物分离，过滤生物分子等方面有着广泛的应用。然而，调整聚合物在纳米尺度通道中的运动受到速度的对流和扩散分量的限制。利用聚合物对溶剂和壁的亲和力以及聚合物结构，提出了诱导聚合物选择性捕获的机制。类似的分馏的烃类的分子量的基础上，分馏分离的技术，取决于在一个坑，位于垂直于流动的不同深度的聚合物链的通道润湿性的建议。根据聚合物链的性质和表面化学性质，可以预测聚合物在凹坑中特定水平的分离。这种行为源于聚合物结构的差异，导致基于润湿性的捕获和熵捕获之间的竞争。这项研究的结果提出了一种新的方法，分离生物聚合物的基础上，而不依赖于通道的几何结构。
英文摘要：
Trapping macromolecules in nanopits finds multifarious applications in polymer separation, filtering biomolecules etc. However, tuning the locomotion of polymers in channels of nanoscopic dimensions is greatly restricted by the comparative advective and diffusive components of velocities. Using the polymer affinity toward the solvent and the wall, and the polymer structure, a mechanism is proposed to induce selective trapping of polymers. Similar to fractional distillation of hydrocarbons based on molecular weight, a technique of fractional segregation, depending on the channel wettability of polymeric chains at different depths in a pit that is located perpendicular to the flow is suggested. Depending on the properties of the polymeric chains and the surface chemistry, the segregation of the polymer at a particular level in the pit can be predicted. This behaviour stems from the difference in polymer structure leading to a competition between wettability based trapping and entropic trapping. The results of this study suggest a novel way of separating biopolymers based on their structure without relying on the channel geometry.
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