期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 11, 页码 3790-3794出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201512025
关键词
electrical double layer; liquid microjets; potential drop; solid-liquid interface; Stern layer capacitance
资金
- Swiss National Science Foundation [153578]
- Formas [2016-2013-673]
- Nanosphere centre of excellence
The chemistry and physics of charged interfaces is regulated by the structure of the electrical double layer (EDL). Herein we quantify the average thickness of the Stern layer at the silica (SiO2) nanoparticle/aqueous electrolyte interface as a function of NaCl concentration following direct measurement of the nanoparticles' surface potential by X-ray photoelectron spectroscopy (XPS). We find the Stern layer compresses (becomes thinner) as the electrolyte concentration is increased. This finding provides a simple and intuitive picture of the EDL that explains the concurrent increase in surface charge density, but decrease in surface and zeta potentials, as the electrolyte concentration is increased.
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