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Journal Articles

Effect of the headgroup structure on counterion binding in adsorbed surfactant films investigated by total reflection X-ray absorption fine structure spectroscopy

Imai, Yosuke*; Tokiwa, Yuhei*; Ueno, Shusaku*; Tanida, Hajime; Watanabe, Iwao*; Matsubara, Hiroki*; Takiue, Takanori*; Aratono, Makoto*

Bulletin of the Chemical Society of Japan, 91(10), p.1487 - 1494, 2018/10

 Times Cited Count:0 Percentile:0(Chemistry, Multidisciplinary)

Competitive binding of binary mixed counterions to the headgroups of adsorbed surfactant films has been investigated at solution surfaces by total reflection X-ray absorption fine structure (XAFS) spectroscopy. The obtained extended XAFS $$chi$$ spectra for bromide counterions are linear combinations of the spectra of fully hydrated bromide ions (free Br) and partially dehydrated bromide ions bound to the headgroups of the surfactant ions (bound Br). From the fraction of bound Br in counterion mixed systems, two series of the relative strengths of counterion binding are proposed for the trimethylammonium (TA$$^{+}$$) and 3-methylimidazolium (MIM$$^{+}$$) headgroups: (a) TA-SO$$_{4}$$ $$<$$ TA-Cl $$<$$ TA-Br $$<$$ TA-BF$$_{4}$$ and (b) MIM-Br $$<$$ TA-Br $$<$$ TA-BF$$_{4}$$ $$<$$ MIM-BF$$_{4}$$. For the TA headgroup, matching the hydration of the headgroups and counterions gives series (a) according to Collins' law, which states that the tendency of contact ion pair formation becomes larger when the absolute values of the hydration enthalpies of the ions match. For the MIM headgroup, the number of binding sites of hydrogen bonds between the MIM headgroup and counterion is essential, which leads to series (b) because of competition between the counterion and water for interaction with the MIM headgroup.

Journal Articles

Application study of a high-power millimeter wave; Study of millimeter-wave oscillation by employing an electron beam of kA-class

Maebara, Sunao; Morimoto, Iwao*; Zheng, X.*; Watanabe, Akihiko*; Yamamoto, Masanori*; Sakamoto, Keishi; Shiho, Makoto

Shingaku Giho, 101(415), p.61 - 66, 2001/11

no abstracts in English

Journal Articles

Eu ${it K}$-XAFS of europium dioxymonocyanamide with the convension He$$^+$$ ion yield method

Takahashi, Masao*; Harada, Makoto*; Watanabe, Iwao*; Uruga, Tomoya*; Tanida, Hajime*; Yoneda, Yasuhiro; Emura, Shuichi*; Tanaka, Tsunehiro*; Kimura, Hidekazu*; Kubozono, Yoshihiro*; et al.

Journal of Synchrotron Radiation, 6(3), p.222 - 224, 1999/05

 Times Cited Count:10 Percentile:59.73(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Performance study of the cryogenic system for ITER CS model coil

Kato, Takashi; Hamada, Kazuya; Kawano, Katsumi; Matsui, Kunihiro; Hiyama, Tadao; Nishida, Kazuhiko*; Honda, Tadaaki*; Taneda, Masanobu*; Sekiguchi, Shuichi*; Otsu, Kiichi*; et al.

ICEC16/ICMC Proceedings, p.127 - 130, 1996/00

no abstracts in English

Oral presentation

OECD/NEA ROSA Project, 1; Current status of the ROSA Project

Nakamura, Hideo; Watanabe, Tadashi; Suzuki, Mitsuhiro; Asaka, Hideaki; Takeda, Takeshi; Kondo, Masaya; Maruyama, Yu; Otsu, Iwao

no journal, , 

no abstracts in English

Oral presentation

Thermal-hydraulic evaluation for fuel assembly design of next generation FBR in Japan, 3; Numerical analysis for entrance nozzle of fuel assembly

Watanabe, Osamu*; Hayakawa, Satoshi*; Ikarimoto, Iwao*; Ohshima, Hiroyuki

no journal, , 

Numerical investigation using commercial CFD code was performed to estimate flow characteristics of the entrance nozzle of the fuel subassembly of sodium-cooled fast reactor. A three-dimensional numerical simulation of the entrance nozzle test section simulating the fuel subassembly of Monju reactor was carried out. Magnitude of the pressure loss coefficient obtained by the numerical results agreed to that of the experimental result within the uncertainty range required in reactor design. As the result, potential applicability of the numerical simulation using the CFD to design of entrance nozzle of the fuel subassembly was confirmed.

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