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Investigation of surface charge density on solid-liquid interfaces by modulating the electrical double layer

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Title
Investigation of surface charge density on solid-liquid interfaces by modulating the electrical double layer
Author(s)
Jong Kyun Moon; Myung Won Song; Hyuk Kyu Pak
Publication Date
2015-05
Journal
JOURNAL OF PHYSICS-CONDENSED MATTER, v.27, no.19, pp.194102 -
Publisher
IOP PUBLISHING LTD
Abstract
A solid surface in contact with water or aqueous solution usually carries specific electric charges. These surface charges attract counter ions from the liquid side. Since the geometry of opposite charge distribution parallel to the solid-liquid interface is similar to that of a capacitor, it is called an electrical double layer capacitor (EDLC). Therefore, there is an electrical potential difference across an EDLC in equilibrium. When a liquid bridge is formed between two conducting plates, the system behaves as two serially connected EDLCs. In this work, we propose a new method for investigating the surface charge density on solid-liquid interfaces. By mechanically modulating the electrical double layers and simultaneously applying a dc bias voltage across the plates, an ac electric current can be generated. By measuring the voltage drop across a load resistor as a function of bias voltage, we can study the surface charge density on solid-liquid interfaces. Our experimental results agree very well with the simple equivalent electrical circuit model proposed here. Furthermore, using this method, one can determine the polarity of the adsorbed state on the solid surface depending on the material used. We expect this method to aid in the study of electrical phenomena on solid-liquid interfaces
URI
https://pr.ibs.re.kr/handle/8788114/2024
ISSN
0953-8984
Appears in Collections:
Center for Soft and Living Matter(첨단연성물질 연구단) > Journal Papers (저널논문)
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