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OALib Journal期刊
ISSN: 2333-9721
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水溶液中管状带电纳米颗粒跨膜输运的分子动力学模拟
DOI: 10.3724/SP.J.1105.2013.13144, PP. 1561-1566
Keywords: 纳米颗粒,水,输运,膜,分子动力学
Abstract:
采用分子动力学模拟方法研究了水溶液中管状带电纳米颗粒的跨膜输运过程.主要考察了纳米颗粒的尺寸、所带的电性以及外驱动电场的大小对输运动力学行为的影响.研究表明，随着外电场的增大，所有管状纳米颗粒的跨膜流量都迅速增大，其中有些颗粒呈现出非单调的变化，这与之前发现的球形纳米颗粒单调增加的趋势截然不同；而跨膜时间会随电场强度的增大而单调减小，并符合幂指数衰减的规律，这与郎之万动力学的理论预测一致.在同一电场强度下，管状颗粒的跨膜流量要比球形颗粒小几倍到一个数量级，而跨膜时间则大几倍.与球形颗粒相比，管状颗粒需要牺牲一定的旋转自由度才能进入通道，因此它们通常具有低的跨膜流量和长的跨膜时间.研究结果加深了人们对于不同形状纳米颗粒跨膜输运的理解，对高效纳米载体的设计具有一定的参考意义.
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