Technische Universität Darmstadt, Fachbereich Material- und Geowissenschaften, Fachgebiet Materialanalytik, Darmstadt, Germany.
Nanotechnology. 2010 Sep 10;21(36):365701. doi: 10.1088/0957-4484/21/36/365701. Epub 2010 Aug 11.
We present an experimental demonstration of a synthetic nanoporous membrane suitable for charge-selective transport of ionic species. The surfaces and walls of synthetic nanochannels, fabricated in heavy ion-tracked polyethylene terephthalate membranes are negatively charged due to the presence of carboxylate moieties. These nanofilters discriminate and gate the transport of cations while inhibiting the passage of anions. The permselectivity of these membranes is reversed by converting the carboxylic moieties into terminated amino groups. The positively charged (aminated) membranes facilitate the transport of anions. Based on the same principle, charged biomolecules (bovine serum albumin and lysozyme) are successfully filtered through these membranes. These membranes also exhibit the phenomenon of ion concentration polarization.
我们展示了一种适用于离子种类电荷选择传输的合成纳米多孔膜的实验演示。由于存在羧酸酯部分，在重离子跟踪聚对苯二甲酸乙二醇酯膜中制造的合成纳米通道的表面和壁是带负电荷的。这些纳米过滤器可区分和门控阳离子的传输，同时抑制阴离子的通过。通过将羧酸酯部分转化为端氨基基团，可以反转这些膜的选择性。带正电荷的（氨基化的）膜有利于阴离子的传输。基于相同的原理，带电荷的生物分子（牛血清白蛋白和溶菌酶）可成功地通过这些膜过滤。这些膜还表现出离子浓差极化现象。
