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Transport properties of track-etched membranes having variable effective pore-lengths

机译：有效孔长可变的轨迹蚀刻膜的传输特性

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The transport rate of molecules through polymeric membranes is normally limited because of their micrometer-scale thickness which restricts their suitability for more practical application. To study the effect of effective pore length on the transport behavior, polymer membranes containing cylindrical and asymmetric-shaped nanopores were prepared through a two-step ion track-etching technique. Permeation experiments were performed separately to investigate the transport properties (molecular flux and selectivity) of these track-etched membranes. The permeation data shows that the molecular flux across membranes containing asymmetric nanopores is higher compared to those having cylindrical pores. On the other hand, the cylindrical pore membranes exhibit higher selectivity than asymmetric pores for the permeation of charged molecules across the membrane. Current-voltage (I-V) measurements of single-pore membranes further verify that asymmetric pores exhibit lower resistance for the flow of ions and therefore show higher currents than cylindrical pores. Moreover, unmodified and polyethyleneimine (PEI) modified asymmetric-shaped pore membranes were successfully used for the separation of cationic and anionic analyte molecules from their mixture, respectively. In this study, two distinct effects (pore geometry and pore density, i.e. number of pores cm(-2)), which mainly influence membrane selectivity and molecular transport rates, were thoroughly investigated in order to optimize the membrane performance. In this context, we believe that membranes with high molecular transport rates could readily find their application in molecular separation and controlled drug delivery processes.
机译：分子通过聚合物膜的传输速率通常受到限制，因为它们的微米级厚度限制了其更实际应用的适用性。为了研究有效孔径对传输行为的影响，通过两步离子轨迹蚀刻技术制备了包含圆柱形和不对称形状纳米孔的聚合物膜。分别进行渗透实验以研究这些径迹蚀刻膜的传输特性（分子通量和选择性）。渗透数据表明，与具有圆柱形孔的膜相比，穿过包含不对称纳米孔的膜的分子通量更高。另一方面，对于带电分子渗透穿过膜而言，圆柱形孔膜比非对称孔具有更高的选择性。单孔膜的电流-电压（I-V）测量进一步证实，不对称孔对离子流的阻力较小，因此比圆柱形孔的电流更高。此外，未改性和聚乙烯亚胺（PEI）改性的不对称形状的孔膜已成功用于分别从混合物中分离阳离子和阴离子分析物分子。在这项研究中，主要研究了膜选择性和分子传输速率的两个独特的影响（孔的几何形状和孔密度，即孔数cm（-2））进行了彻底研究，以优化膜性能。在这种情况下，我们相信具有高分子传输速率的膜可以很容易地在分子分离和可控药物传递过程中找到其应用。

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