期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1364, 期 -, 页码 59-63出版社
ELSEVIER
DOI: 10.1016/j.chroma.2014.08.090
关键词
Nanopartides; Stacking; Boundary effects; Dynamic pH junction; pH boundary
资金
- Operational Program Research and Development for Innovations - European Regional Development Fund [CZ.1.05/2.1.00/03.0058]
- Operational Program Education for Competitiveness - European Social Fund [CZ.1.07/2.3.00/30.0004, CZ.1.07/2.3.00/20.0018]
During the last years, several authors have focused on the characterization of the size and charge of the nanoparticles by capillary electrophoresis. However, considering that nanoparticles are generally suspended in a solvent different from those commonly used as background electrolytes (BGE), an appropriate characterization of the behavior of the nanoparticles in the sample-BGE interface is required, as this might affect the overall electrophoretic behavior of the nanoparticles. In the present work, we address the evaluation,of the behavior of COOH-coated maghemite nanoparticles in the vicinity of a pH boundary. To do so, different suspensions of nanoparticles prepared in acid media were injected into a borate/NaOH pH 9.5 BGE. The formation and evolution of boundaries in the sample-BGE interface in such systems was modeled by computer simulation. A systematic evaluation of the effect that parameters such as the co-ion, the sample pH or the injection time have on the electrophoretic behavior of the nanoparticles was carried out. (C) 2014 Elsevier B.V. All rights reserved.
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