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Journal Articles

Decomposition of halophenols in room-temperature ionic liquids by ionizing radiation

Kimura, Atsushi; Taguchi, Mitsumasa; Kondo, Takafumi*; Yang, J.*; Nagaishi, Ryuji; Yoshida, Yoichi*; Hirota, Koichi

Radiation Physics and Chemistry, 79(11), p.1159 - 1164, 2010/11

 Times Cited Count:3 Percentile:25.3(Chemistry, Physical)

Much of this past research has focused on finding more effective reactions between charged reactive species in room temperature ionic liquid (RTILs), which have a coulombic field. Reactions in RTILs involving the charged reactive species, particularly solvated electrons, have been studied by the techniques of radiation chemistry. The reaction behavior of halophenols in RTILs were investigated by $$gamma$$ ray and pulsed electron radiolysis. The yield of CP decomposition in the RTILs was almost the same as that of solvated electrons formation. The yield of CP decomposition and phenol formation in the RTILs was low in the presence of electron scavengers such as nitrous oxide, indicating that solvated electrons primarily contributed to the decomposition of CP. The type of halogen group with the exception of fluorine had a negligible effect on the decomposition of halophenols in the RTILs. Therefore, RTILs could be applied as an reaction media for the reduction by ionizing radiation.

Journal Articles

Pulse radiolysis study of ion-species effects on the solvated electron in alkylammonium ionic liquids

Kondo, Takafumi*; Asano, Akira*; Yang, J.*; Norizawa, Kimihiro*; Takahashi, Kenji*; Taguchi, Mitsumasa; Nagaishi, Ryuji; Kato, Ryuji*; Yoshida, Yoichi*

Radiation Physics and Chemistry, 78(12), p.1157 - 1160, 2009/12

 Times Cited Count:28 Percentile:87.41(Chemistry, Physical)

Spectrum and kinetic behavior of solvated electrons (e$$_{sol}$$$$^{-}$$) in alkyl ammonium ionic liquids (ILs), ${it i.e.}$ DEMMA-TFSI, DEMMA-BF4, TMPA-TFSI, PP13-TFSI, P13-TFSI and P14-TFSI were investigated by pulse radiolysis method. The e$$_{sol}$$$$^{-}$$ in the ILs have same absorption peak at 1100 nm with a molar absorption coefficient of 1.5-2.3$$times$$10$$^{4}$$ dm$$^{3}$$mol$$^{-1}$$cm$$^{-1}$$. The reaction rate constant of e$$_{sol}$$$$^{-}$$ with Pyrene (Py) was 1.5-3.5$$times$$10$$^{8}$$ dm$$^{3}$$mol$$^{-1}$$s$$^{-1}$$. These values were about one order of magnitude higher than that of diffusion controlled limit, which was calculated from measured viscosity. The dry electron (e$$_{dry}$$$$^{-}$$) reacts with Py, and its rate constant in DEMMA-TFSI was 7.9$$times$$10$$^{11}$$ dm$$^{3}$$mol$$^{-1}$$s$$^{-1}$$, three orders of magnitude higher than that of the e$$_{sol}$$$$^{-}$$ reactions.

Journal Articles

Study on the reaction of chlorophenols in room temperature ionic liquids with ionizing radiation

Kimura, Atsushi; Taguchi, Mitsumasa; Kondo, Takafumi*; Yang, J.*; Yoshida, Yoichi*; Hirota, Koichi

Radiation Physics and Chemistry, 77(10-12), p.1253 - 1257, 2008/10

 Times Cited Count:10 Percentile:58.08(Chemistry, Physical)

Journal Articles

Molar absorption coefficient and radiolytic yield of solvated electrons in diethylmethyl(2-methoxy)ammonium bis (trifluoromethanesulfonyl)imide ionic liquid

Asano, Akira*; Yang, J.*; Kondo, Takafumi*; Norizawa, Kimihiro*; Nagaishi, Ryuji; Takahashi, Kenji*; Yoshida, Yoichi*

Radiation Physics and Chemistry, 77(10-12), p.1244 - 1247, 2008/10

 Times Cited Count:24 Percentile:83.25(Chemistry, Physical)

The molar extinction coefficient and the radiolytic yield of solvated electrons in ionic liquid of DEMMA-TFSI were estimated respectively to be 2.3$$times$$10$$^{4}$$ L mol$$^{-1}$$ cm$$^{-1}$$ and 0.8$$times$$10$$^{-7}$$ mol J$$^{-1}$$ by observing the reaction and kinetics of solvated electron and dry electron in the ionic liquid. The solvated electron in DEMMA-TFSI has a very broad absorption spectrum peaking at 1100 nm and reacts slowly with pyrene with a rate constant of 3.5$$times$$10$$^{8}$$ L mol$$^{-1}$$ s$$^{-1}$$, while the dry electron is captured rapidly by pyrene with C$$_{37}$$ value of 0.065 mol L$$^{-1}$$.

Journal Articles

Picosecond pulse radiolysis; Dynamics of solvated electrons in ionic liquid and geminate ion recombination in liquid alkanes

Yang, J.*; Kondo, Takafumi*; Norizawa, Kimihiro*; Nagaishi, Ryuji; Taguchi, Mitsumasa; Takahashi, Kenji*; Kato, Ryuji*; Anishchik, S. V.*; Yoshida, Yoichi*; Tagawa, Seiichi*

Radiation Physics and Chemistry, 77(10-12), p.1233 - 1238, 2008/10

 Times Cited Count:24 Percentile:83.25(Chemistry, Physical)

First observation of picosecond dynamics in ionic liquid of DEMMA-TFSI in radiation chemistry was reported. It is found that the electron produced by ionization is solvated to full solvation in ionic liquid with a rate constant of 3.9$$times$$10$$^{10}$$ s$$^{-1}$$. The yield of solvated electrons in picosecond time region is 1.2$$times$$10$$^{-7}$$ mol J$$^{-1}$$. The dry electron in ionic liquid reacts rapidly with biphenyl and pyrene with a rate constant of 3.8 to 7.9$$times$$10$$^{11}$$ L mol$$^{-1}$$ s$$^{-1}$$. The geminate ion recombination in n-dodecane and n-hexane was also observed by monitoring the transient absorptions at 523 nm.

Journal Articles

Transient absorption of a cation radical of pyrene induced by heavy ion beam pulses

Kondo, Takafumi*; Yang, J.*; Kan, Koichi*; Yoshida, Yoichi*; Shibata, Hiromi*; Taguchi, Mitsumasa; Kojima, Takuji

JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 160, 2008/03

no abstracts in English

Journal Articles

Development of the heavy ion beam pulse radiolysis

Kondo, Takafumi*; Yang, J.*; Kan, Koichi*; Yoshida, Yoichi*; Shibata, Hiromi*; Taguchi, Mitsumasa; Kojima, Takuji

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 141, 2007/02

no abstracts in English

Journal Articles

Study of radiation-induced primary process by ion pulse radiolysis

Yoshida, Yoichi*; Yang, J.*; Kondo, Takafumi*; Seki, Shuhei*; Kozawa, Takahiro*; Tagawa, Seiichi*; Shibata, Hiromi*; Taguchi, Mitsumasa; Kojima, Takuji; Namba, Hideki

JAEA-Review 2005-001, TIARA Annual Report 2004, p.183 - 185, 2006/01

A heavy-ion-pulse radiolysis technology was developed using a single-photon-counting system. In the system, the ion beam was injected a thin scintillator before irradiating the sample. The light emitted from the scintillator by the ion irradiation was used as analyzing source to detect the absorption of primary species in water. Measurement of time-dependent absorption of hydrated electrons in water was achieved using the system, which demonstrates the usefulness of this technique.

Oral presentation

Heavy-ion pulse radiolysis

Yang, J.*; Taguchi, Mitsumasa; Kondo, Takafumi*; Yoshida, Yoichi*; Shibata, Hiromi*; Namba, Hideki; Kojima, Takuji

no journal, , 

no abstracts in English

Oral presentation

Time resolved absorption spectroscopy for ion beam excitation

Kondo, Takafumi*; Yang, J.*; Kan, Koichi*; Yoshida, Yoichi*; Shibata, Hiromi*; Taguchi, Mitsumasa; Kojima, Takuji

no journal, , 

no abstracts in English

Oral presentation

Development of the ion beam pulse radiolysis

Kondo, Takafumi*; Yang, J.*; Kan, Koichi*; Yoshida, Yoichi*; Taguchi, Mitsumasa; Kojima, Takuji; Shibata, Hiromi*

no journal, , 

no abstracts in English

Oral presentation

Picosecond pulse radiolysis study of solvated electrons in ionic liquid

Asano, Akira*; Kondo, Takafumi*; Yang, J.*; Nagaishi, Ryuji; Takahashi, Kenji*; Yoshida, Yoichi*

no journal, , 

The spectrum and kinetic behavior of solvated electrons in DEMMA-TFSI and DEMMA-BF$$_{4}$$ ionic liquids (ILs) were investigated by using nanosecond pulse radiolysis technique. The reactions of the solvated electrons with pyrene and biphenylene were studied. The molar extinction coefficent and G value of the solvated electrons in ILs were estimated. The formation of the solvated electrons in IL on picosecond time scale was observed by picosecond pulse radiolysis.

Oral presentation

Solvated electrons in ionic liquids

Takahashi, Kenji*; Hiejima, Yusuke*; Kato, Ryuji*; Nagaishi, Ryuji; Taguchi, Mitsumasa; Kojima, Takuji; Kondo, Takafumi*; Yang, J.*; Yoshida, Yoichi*

no journal, , 

Solvated electrons were studied using the pulse radiolysis and photo ionization methods. The Vis-NIR spectra and reactivity of the solvated electrons in ionic liquids are discussed.

Oral presentation

Reduction of chlorophenols in ionic liquid by radiation

Taguchi, Mitsumasa; Kimura, Atsushi; Kondo, Takafumi*; Yang, J.*; Yoshida, Yoichi*; Hirota, Koichi

no journal, , 

no abstracts in English

Oral presentation

Transient absorbance of pyrene cation radical produced by heavy ions

Kondo, Takafumi*; Yang, J.*; Kan, Koichi*; Yoshida, Yoichi*; Shibata, Hiromi*; Taguchi, Mitsumasa; Kojima, Takuji

no journal, , 

no abstracts in English

Oral presentation

Pulse radiolysis study of water effects on the solvated electrons in the hydrophobic ionic liquid

Kondo, Takafumi*; Asano, Akira*; Yang, J.*; Taguchi, Mitsumasa; Nagaishi, Ryuji; Yoshida, Yoichi*

no journal, , 

no abstracts in English

Oral presentation

The Study of formations and reactions of solvated electrons in ionic liquids by using pulse radiolysis

Asano, Akira*; Kondo, Takafumi*; Yang, J.*; Taguchi, Mitsumasa; Nagaishi, Ryuji; Takahashi, Kenji*; Yoshida, Yoichi*

no journal, , 

The spectrum and kinetic behavior of solvated electrons in DEMMA-TFSI and DEMMA-BF$$_{4}$$ ionic liquids (ILs) were investigated by using nanosecond pulse radiolysis technique. The reactions of the solvated electrons with pyrene were studied. The molar extinction coefficient and G value of the solvated electrons in ILs were estimated to be 2.2$$times$$10$$^{4}$$M$$^{-1}$$cm$$^{-1}$$(at 1100nm) and 0.9#100eV$$^{-1}$$. The formation of the solvated electrons in IL on picosecond time scale was observed by picosecond pulse radiolysis.

Oral presentation

Development of sodium leak detection technology by means of laser resonance ionization mass spectrometry, 3-1; Project overview

Aoyama, Takafumi; Okazaki, Koki*; Ito, Chikara; Iguchi, Tetsuo*; Watanabe, Kenichi*; Takegawa, Nobuyuki*; Kondo, Yutaka*

no journal, , 

no abstracts in English

Oral presentation

Extension of heavy ion pulse radiolysis system using scintillator

Kondo, Takafumi*; Yang, J.*; Kan, Koichi*; Norizawa, Kimihiro*; Shibata, Hiromi*; Taguchi, Mitsumasa; Kurashima, Satoshi; Hirota, Koichi

no journal, , 

no abstracts in English

Oral presentation

The Study of highly sensitivity technique for sodium leak detection using laser resonance ionization mass spectrometry to improve fast reactor plant safety

Aoyama, Takafumi; Ito, Chikara; Araki, Yoshio; Naito, Hiroyuki; Okazaki, Koki*; Harano, Hideki*; Watanabe, Kenichi*; Iguchi, Tetsuo*; Takegawa, Nobuyuki*; Kondo, Yutaka*

no journal, , 

no abstracts in English

50 (Records 1-20 displayed on this page)