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首页> 外文期刊>Nano letters >Polymeric nanopore membranes for hydrophobicity-based separations by conformal initiated chemical vapor deposition
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Polymeric nanopore membranes for hydrophobicity-based separations by conformal initiated chemical vapor deposition

机译：聚合物纳米孔膜，用于通过保形引发的化学气相沉积进行基于疏水性的分离

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摘要

High-aspect ratio hydrophobic, cylindrical nanopores having diameters as low as 5 nm are rapidly fabricated using conformal vapor deposition of fluorinated polymeric layers into porous track-etched polycarbonate membranes. The resultant selectivity of these membranes for pairs of small molecules of similar size, but of different hydrophobicity, arises from solute-pore wall interactions emphasized by confinement. Increasing selectivity was observed as pore diameter decreased and as the surface of the pore became more hydrophobic. Cylindrical pores provided higher selectivity than bottleneck-shaped pores having the same minimum diameter. A maximum selectivity of 234 was achieved between mesitylene and phloroglucinol by the best performing membrane. Membranes with small fluorinated pores exhibited an effective cutoff based on the polar surface area of the molecules, with limited correlation with solute size. This technology could lead to a new generation of membrane separations based on specific interactions.
机译：使用氟化聚合物层的保形气相沉积到多孔径迹蚀刻的聚碳酸酯膜中，可以快速制造出直径低至5 nm的高纵横比疏水性圆柱形纳米孔。这些膜对大小相似但疏水性不同的小分子对的选择性是由限制作用所强调的溶质-孔壁相互作用产生的。随着孔直径的减小和孔表面疏水性的增加，选择性增加。圆柱孔比​​具有相同最小直径的瓶颈形孔具有更高的选择性。通过性能最佳的膜，在均三甲苯和间苯三酚之间达到了234的最大选择性。具有小氟化孔的膜根据分子的极性表面积表现出有效的截止，与溶质的大小相关性有限。这项技术可能会导致基于特定相互作用的新一代膜分离。

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