期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 457, 期 -, 页码 131-140出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2015.06.042
关键词
Colloidal nanoparticles; Capillary electrophoresis; Taylor dispersion analysis; Zeta potential; Hydrodynamic radius distribution; Relaxation effect; Ionic drag coefficient; Asymmetric flow field-flow fractionation
资金
- German Science Foundation [DFG PY 6/11-1]
- Iraqi Ministry of Higher Education and Scientific Research (MoHESR) University of Mosul
- DFG [GRK 1782]
- European Commission
- Alexander von Humboldt Foundation
In the first paper of this series we have shown for hydrophilic coated Au nanoparticles that capillary electrophoresis in combination with Taylor dispersion analysis in fused silica capillaries with an inner diameter of 75 mu m allows for the unbiased precise determination of the number-weighted mean hydrodynamic diameter, the zeta potential and the effective charge number, although mobility corrected double layer polarization has to be taken into account. In this second paper we investigate whether the modified approximate analytic expression developed by Ohshima (2001) permits the calculation of calibration lines and the concomitant conversion of electropherograms into number-weighted particle radius distributions. We show that with the method developed size distributions are obtained which are independent of the measurement conditions. These size distributions are much narrower than those obtained via dynamic light scattering and data evaluation by the CONTIN algorithm. Capillary electrophoresis together with the proposed data evaluation method reveals that the analyzed nanoparticle populations have very narrow size distributions with a width of 2-4 nm. The hydrodynamic radius distributions of the coated NPs are only slightly broader than the solid particle radius distribution of the Au-NP cores. The presence of monomodal/bimodal size distributions is confirmed by asymmetric flow field-flow fractionation. (C) 2015 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据