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Quantitative Observation of Electric Potential Distribution of Brittle Polyelectrolyte Hydrogels Using Microelectrode Technique

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Title: Quantitative Observation of Electric Potential Distribution of Brittle Polyelectrolyte Hydrogels Using Microelectrode Technique
Authors: Guo, Honglei Browse this author
Kurokawa, Takayuki Browse this author
Takahata, Masakazu Browse this author
Hong, Wei Browse this author
Katsuyama, Yoshinori Browse this author
Luo, Feng Browse this author
Ahmed, Jamil Browse this author
Nakajima, Tasuku Browse this author
Nonoyama, Takayuki Browse this author
Gong, Jian Ping Browse this author →KAKEN DB
Issue Date: 26-Apr-2016
Publisher: American Chemical Society
Journal Title: Macromolecules
Volume: 49
Issue: 8
Start Page: 3100
End Page: 3108
Publisher DOI: 10.1021/acs.macromol.6b00037
Abstract: We report, for the first time, the quantitative measurement of the local electric potential of brittle polyelectrolyte hydrogels using the microelectrode technique (MET). Given the solid-like nature of the hydrogels, the difficulty of applying MET is how to make a good contact of the microelectrode to the hydrogel. Poor local contact substantial underestimates the potential. We observed that, the potential measured decays exponentially with the increase of capillary diameter of the microelectrode. This behavior is related to the capillary wall thickness that determines the contact distance of the electrode probe to the hydrogel. The characteristic decay length in respective to the wall thickness is very close to the local Debye length around the capillary. The latter is much larger than that of the bath solution due to the reverse osmosis effect. By using microelectrodes with a tip wall thickness less than the local Debye length, the Donnan potential of polyelectrolyte gel could be accurately measured. Using a micromanipulator, the inserting process of the microelectrode is precisely controlled, and the depth profile of electric potential in the hydrogels can be measured with a spatial resolution down to ∼5 nm. From the spatial distribution of potential, the microstructure of hydrogels both in bulk and near the surface, the thickness of ultrathin hydrogels, and the heterogeneous layered structure of composite gels, can be determined accurately. The MET established in this work provides a powerful tool for direct characterization of the spatial distribution of electric potential of hydrogels.
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Macromolecules, copyright ©2016 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Type: article (author version)
Appears in Collections:生命科学院・先端生命科学研究院 (Graduate School of Life Science / Faculty of Advanced Life Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 龔 剣萍 (Gong Jian Ping)

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