纳米孔
硅醇
表面电荷
电荷密度
胺气处理
Zeta电位
化学
离子
化学物理
氮化硅
纳米技术
硅
材料科学
分析化学(期刊)
物理化学
有机化学
物理
纳米颗粒
催化作用
量子力学
作者
Kabin Lin,Zhongwu Li,Yi Tao,Kun Li,Haojie Yang,Jian Ma,Tie Li,Jingjie Sha,Yunfei Chen
出处
期刊:Langmuir
[American Chemical Society]
日期:2021-08-04
卷期号:37 (35): 10521-10528
被引量:20
标识
DOI:10.1021/acs.langmuir.1c01504
摘要
Surface charges inside a nanopore determine the zeta potential and ion distributions and play a significant role in affecting ion transport and the sensitivity of detecting biomolecules. It is of great importance to study the fluctuation of surface charges with the salt concentration and pH in various applications of nanopores. Herein, we proposed a theoretical model to predict the surface charge density of a Si3N4 nanopore, in which both silanol and amine groups were taken into account. It was demonstrated that the surface charge density in the Si3N4 nanopore changes not only with pH but also with the salt concentration. The theoretical model could well predict the experimental results with different salt concentrations, pH values, and pore sizes. The effect of surface functional groups on the isopotential point (pHiep) of the Si3N4 nanopore was also systematically studied. The results indicated that the silanol groups are major determinants of the surface charge, but the influences of the amine groups should not be ignored because the small number of amine groups can change pHiep dramatically. The pHiep value of the Si3N4 nanopore was measured as 4.1, and the ratio of amine over silanol was ascertained as 0.013.
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