Department of Physics, Clarkson University, 8 Clarkson Avenue, Potsdam, New York 13699, United States.
ACS Nano. 2013 Aug 27;7(8):7053-61. doi: 10.1021/nn4023697. Epub 2013 Jul 30.
Translocation dynamics of nanoparticles permeating through the nanopore in an n-Si semiconductor membrane is studied. With the use of Brownian Dynamics to describe the motion of the charged nanoparticles in the self-consistent membrane-electrolyte electrostatic potential, we asses the possibility of using our voltage controlled membrane for the macroscopic filtering of the charged nanoparticles. The results indicate that the tunable local electric field inside the membrane can effectively control interaction of a nanoparticle with the nanopore by either blocking its passage or increasing the translocation rate. The effect is particularly strong for larger nanoparticles due to their stronger interaction with the membrane while in the nanopore. By extracting the membrane permeability from our microsopic simulations, we compute the macroscopic sieving factors and show that the size selectivity of the membrane can be tuned by the applied voltage.
研究了纳米粒子通过 n-Si 半导体膜中的纳米孔的迁移动态。通过布朗动力学来描述带电纳米粒子在自洽膜-电解质静电势中的运动，我们评估了使用我们的电压控制膜对带电纳米粒子进行宏观过滤的可能性。结果表明，膜内可调谐的局部电场可以通过阻止其通过或增加迁移率来有效地控制纳米粒子与纳米孔的相互作用。对于较大的纳米粒子，由于它们与膜的相互作用更强，因此这种效应更为强烈，而在纳米孔中。通过从我们的微观模拟中提取膜通透性，我们计算了宏观筛析因子，并表明膜的尺寸选择性可以通过施加的电压进行调节。
