聚电解质多层对圆锥形纳米孔离子电流整流的影响。

Impact of Polyelectrolyte Multilayers on the Ionic Current Rectification of Conical Nanopores.

机构信息

Institut Européen des Membranes, UMR5635 UM ENSM CNRS , Place Eugène Bataillon , 34095 Montpellier Cedex 5 , France.

Faculty of Chemistry and Geosciences , Vilnius University , Naugarduko Street 24 , 01513 Vilnius , Lithuania.

出版信息

Langmuir. 2018 Mar 20;34(11):3405-3412. doi: 10.1021/acs.langmuir.8b00222. Epub 2018 Mar 5.

DOI:10.1021/acs.langmuir.8b00222

PMID:29466014

Abstract

Single conical nanopores were functionalised layer by layer with weak polyelectrolytes. We studied their influence on the ionic diode properties We have considered different couples of polyelectrolytes: poly-l-lysine/poly(acrylic acid) and poly(ethyleneimine)/poly(acrylic acid) as well as the influence of cross-linking. The results show that the nanopores decorated with poly(ethyleneimine)/poly(acrylic acid) exhibit an interesting behavior. Indeed, at pH 3, the nanopore is open only at the low salt concentration, while at pH 7, it is already open. The nanopores functionalized with poly-l-lysine/poly(acrylic acid) do not show an inversion of ionic transport properties with the pH as expected. After cross-linked to prevent large conformational changes, the ionic diode properties are dependent on the pH.

摘要

单层锥形纳米孔通过弱聚电解质逐层功能化。我们研究了它们对离子二极管性能的影响。我们考虑了不同的聚电解质对：聚-l-赖氨酸/聚（丙烯酸）和聚（亚乙基亚胺）/聚（丙烯酸）以及交联的影响。结果表明，用聚（亚乙基亚胺）/聚（丙烯酸）修饰的纳米孔表现出有趣的行为。实际上，在 pH 值为 3 时，纳米孔仅在低盐浓度下打开，而在 pH 值为 7 时，纳米孔已经打开。用聚-l-赖氨酸/聚（丙烯酸）功能化的纳米孔没有表现出预期的 pH 值引起的离子传输性质的反转。交联以防止大的构象变化后，离子二极管的性能取决于 pH 值。