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

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タイトル: Quantitative Observation of Electric Potential Distribution of Brittle Polyelectrolyte Hydrogels Using Microelectrode Technique
著者: Guo, Honglei 著作を一覧する
Kurokawa, Takayuki 著作を一覧する
Takahata, Masakazu 著作を一覧する
Hong, Wei 著作を一覧する
Katsuyama, Yoshinori 著作を一覧する
Luo, Feng 著作を一覧する
Ahmed, Jamil 著作を一覧する
Nakajima, Tasuku 著作を一覧する
Nonoyama, Takayuki 著作を一覧する
Gong, Jian Ping 著作を一覧する
発行日: 2016年 4月26日
出版者: American Chemical Society
誌名: Macromolecules
巻: 49
号: 8
開始ページ: 3100
終了ページ: 3108
出版社 DOI: 10.1021/acs.macromol.6b00037
抄録: 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
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 龔 剣萍 (Gong Jian Ping)


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