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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Electrophoretic Migration and Axial Diffusion of Individual Nanoparticles in Cylindrical Nanopores
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Electrophoretic Migration and Axial Diffusion of Individual Nanoparticles in Cylindrical Nanopores

机译：圆柱纳米孔中单个纳米粒子的电泳迁移和轴向扩散

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Membranes with straight, vertical nanopores have found widespread applications in chemical and biological sciences, including separation, detection, catalysis, and drug delivery. They can also serve as a model system to understand molecular behavior and fundamental mechanisms of separation, bridging the gap between conventional model systems such as flat surfaces and real chromatographic stationary phases such as micrometer-sized porous particles. We recently found that the axial motion of individual biomolecules inside nanopores can be significantly slower than in bulk solution. This suggests that either chromatographic adsorption was present and/or the viscosity inside the nanopores was unusually high. In this study, we measured the electrophoretic motion as well as the axial diffusion of individual nanoparticles in cylindrical alumina nanopores. We found that the electrophoretic mobilities and the diffusion coefficients of polystyrene nanoparticles were both substantially smaller compared to bulk solution independent of particle size or pore diameter. The results imply that the apparent solution viscosity in nanodomains is anomalous.
机译：具有直的，垂直的纳米孔的膜已在化学和生物科学中得到广泛应用，包括分离，检测，催化和药物递送。它们还可以用作模型系统，以了解分子行为和分离的基本机理，弥合传统模型系统（例如平坦表面）与实际色谱固定相（例如微米级多孔颗粒）之间的差距。我们最近发现，纳米孔内单个生物分子的轴向运动可能比本体溶液中的慢得多。这表明存在色谱吸附和/或纳米孔内部的粘度异常高。在这项研究中，我们测量了圆柱状氧化铝纳米孔中单个纳米粒子的电泳运动以及轴向扩散。我们发现，与本体溶液相比，聚苯乙烯纳米颗粒的电泳迁移率和扩散系数均明显较小，而与粒径或孔径无关。结果暗示纳米域中的表观溶液粘度是异常的。

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