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タイトル: Proton-Enhanced Dielectric Properties of Polyoxometalates in Water under Radio-Frequency Electromagnetic Waves
著者: Tsubaki, Shuntaro
Hayakawa, Shogo
Ueda, Tadaharu
Mitani, Tomohiko  kyouindb  KAKEN_id
Suzuki, Ei-ichi
Fujii, Satoshi
Wada, Yuji
著者名の別形: 三谷, 友彦
キーワード: polyoxometalate
dielectric spectroscopy
radio frequency
proton relay
発行日: Jul-2018
出版者: MDPI AG
誌名: Materials
巻: 11
号: 7
論文番号: 1202
抄録: Electromagnetic waves, such as microwaves, have been used to enhance various chemical reactions over polyoxometalates. The dielectric properties of catalysts are among the relevant parameters facilitating catalytic reactions under electromagnetic radiation. This study describes the dielectric properties of polyoxometalate catalysts in aqueous and organic solutions to understand the mechanism of interactions between polyoxometalates and electromagnetic waves. Specific loss factors of polyoxometalates were observed at lower frequencies (<1 GHz) by the ionic conduction of the polyoxometalate solution. The evolution of ionic conduction depended strongly on cations rather than anions. Proton-type polyoxometalates exhibited significantly higher loss factors than other cations did. The activation energy for ionic conduction in protonated silicotungstic acid (H₄SiW₁₂O₄₀) was significantly low in water (7.6–14.1 kJ/mol); therefore, the high loss factor of protonated polyoxometalates in water was attributed to the proton relay mechanism (i.e., Grotthuss mechanism). The results suggested that the proton relay mechanism at the radio-frequency band is critical for generating selective interactions of polyoxometalates with applied electromagnetic fields.
著作権等: © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
URI: http://hdl.handle.net/2433/236476
DOI(出版社版): 10.3390/ma11071202
PubMed ID: 30011791
出現コレクション:学術雑誌掲載論文等

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