News Column

Findings from Tokyo University of Science in the Area of Physics Research Reported

May 27, 2014

By a News Reporter-Staff News Editor at Physics Week -- Research findings on Physics Research are discussed in a new report. According to news reporting from Tokyo, Japan, by VerticalNews journalists, research stated, "Using large single molecular porous crystals of ({[Co-III(H(2)bim)(3)](TATC)center dot 7H(2)O}(n)), we have studied the dynamics of hydrated protons and configurational defects via the water chain by measuring the Raman and infrared spectra, and microwave conductivity. The highly one-dimensional water chain is affected by the periodic arrangement of charged groups, which yield short-and long-range interfacial interactions."

The news correspondents obtained a quote from the research from the Tokyo University of Science, "Below a critical temperature (T-c) of about 270 K, the electric dipole of water molecules forming the water chain exhibits antiferroelectric ordering through weak long-range interpore correlation with spatial anisotropy. Above T-c, the small dielectric constant indicates that the antiferroelectric correlation remains, and the configuration of the oxygen atoms in the water molecules is restricted by the short-range interfacial interactions. The anisotropic microwave response with respect to the water chain originates from the Eigen-type hydrated proton (protonic hole) accompanying local distortions, which mutually couples to the mobile configurational D (L) defect. The proton and protonic hole are introduced by self-dissociation of water molecules hydrogen bonded to the carboxylate, and the configurational defect is caused by the rotation of water molecules violating an ice rule. The effective mass of the hydrated proton (protonic hole) is enhanced, in combination with the configurational defect that behaves as the rate-determining step, and consequently the mobility is suppressed by two orders of magnitude compared with the water nanotube in the TMA salt."

According to the news reporters, the research concluded: "Owing to the integration of periodic charge-modulation effect during the transfer, we have experimentally clarified the dramatic suppression of one-dimensional proton conductivity and mobility for the first time."

For more information on this research see: Defect Dynamics of the Dipole Ordered Water Chain in a Polar Nanochannel. Journal of the Physical Society of Japan, 2014;83(5):143-152. Journal of the Physical Society of Japan can be contacted at: Physical Soc Japan, Yushima Urban Building 5F, 2-31-22 Yushima, Bunkyo-Ku, Tokyo, 113-0034, Japan.

Our news journalists report that additional information may be obtained by contacting H. Matsui, Tokyo University of Science, Fac Sci, Dept. of Chem, Shinjuku Ku, Tokyo 1628601, Japan. Additional authors for this research include Y. Suzuki, H. Fukumochi and M. Tadokoro.

Keywords for this news article include: Asia, Tokyo, Japan, Physics Research

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Source: Physics Week

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