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使用原子力显微镜观察DNA与PEI的层层自组装过程

DOI: 10.3724/SP.J.1105.2014.13312, PP. 447-454

Keywords: 脱氧核糖核酸(DNA),聚乙烯亚胺(PEI),层层自组装,原子力显微镜(AFM)

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Abstract:

选择了DNA与聚乙烯亚胺(PEI)进行相互作用,使用AFM直观地观察DNA与PEI层层自组装时其分子形貌的变化过程,总结了自组装过程中薄膜表面粗糙度的变化规律.同时详细地分析了离子浓度、DNA浓度、基底和固定方法对层层自组装膜的影响,以此来探讨DNA与PEI之间的相互作用机理.研究结果表明上述因素都会对膜的形貌产生影响,其中以云母作为基底,PEI处理基底表面后,再进行交替组装时,膜的表面粗糙度变化呈现出锯齿状的增长趋势,而用其他方法会影响膜的形貌以及粗糙度的变化规律.

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