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Journal Articles

Studies on the extraction of soft acid metal species using MIDOA and analogous compounds

Sasaki, Yuji; Saeki, Morihisa; Sugo, Yumi; Ikeda, Yasuhisa*; Kawasaki, Takeshi*; Suzuki, Tomoya*; Ohashi, Akira*

Solvent Extraction Research and Development, Japan, 22(1), p.37 - 45, 2015/05

 Times Cited Count:5 Percentile:64.07(Chemistry, Multidisciplinary)

An extractant, methylimino-bis-${it N,N'}$-dioctylacetamide (MIDOA), was used for the extraction of soft acid metals. It was found that MIDOA can extract not only Cr(VI), Mo(VI), W(VI), Tc(VII) and Re(VII), whose metals can form the oxonium anions due to their high oxidation states, but also other metal cations, like Nb(V), Ta(V) and Pd(II). Analogous compounds, imino-bis-${it N,N'}$-dioctylacetamide (IDOA) and methylimino-bis-${it N,N'}$-di-2-ethylhexylacetamide (MIDEHA), are synthesized and compared for their extractability. It is clear that these extractants have almost same or lower $$D$$ values than those for MIDOA. In order to examine the effect on extractability with different donor atoms, TODGA (${it N,N,N',N'}$-tetraoctyl-diglycolamide) and TDGA (${it N,N,N',N'}$-tetraoctyl-tyiodiglycolamide) having oxygen and sulfur donor are employed. The comparison of their extractabilities suggests that the trend of Pd and Re extraction is N $$>$$ S $$>$$ O and N $$>$$ O $$>$$ S, respectively.

Journal Articles

Comprehensive extraction study using $$N$$,$$N$$-dioctyldiglycolamic acid

Shimojo, Kojiro; Nakai, Ayaka*; Okamura, Hiroyuki; Saito, Takumi*; Ohashi, Akira*; Naganawa, Hirochika

Analytical Sciences, 30(4), p.513 - 517, 2014/04

 Times Cited Count:7 Percentile:59.11(Chemistry, Analytical)

Journal Articles

Extraction behavior and selective separation of lead(II) using $$N$$,$$N$$-dioctyldiglycol amic acid

Shimojo, Kojiro; Nakai, Ayaka; Okamura, Hiroyuki; Ohashi, Akira*; Naganawa, Hirochika

Analytical Sciences, 29(1), p.147 - 150, 2013/01

 Times Cited Count:10 Percentile:50.41(Chemistry, Analytical)

Journal Articles

Structural study on 2,2'-(methylimino)bis($$N$$,$$N$$-dioctylacetamide) complex with Re(VII)O$$_{4}$$$$^{-}$$ and Tc(VII)O$$_{4}$$$$^{-}$$ by $$^{1}$$H-NMR, EXAFS and IR spectroscopy

Saeki, Morihisa; Sasaki, Yuji; Nakai, Ayaka*; Ohashi, Akira*; Banerjee, D.*; Scheinost, A. C.*; Foerstendorf, H.*

Inorganic Chemistry, 51(10), p.5814 - 5821, 2012/05

 Times Cited Count:16 Percentile:33.05(Chemistry, Inorganic & Nuclear)

The structures of the complex of 2,2'-(methylimino)bis($$N$$,$$N$$-dioctylacetamide) (MIDOA) with M(VII)O$$_{4}$$$$^{-}$$ (M=Re and Tc), which were prepared by liquid-liquid solvent extraction, were investigated by using $$^{1}$$H-NMR, EXAFS and IR spectroscopy. The results from $$^{1}$$H-NMR and EXAFS provide therefore evidence of M(VII)O$$_{4}$$$$^{-}$$...H$$^{+}$$MIDOA complex formation in the organic solution. The IR spectra of Re(VII)O$$_{4}$$$$^{-}$$...H$$^{+}$$MIDOA and Tc(VII)O$$_{4}$$$$^{-}$$...H$$^{+}$$MIDOA were analyzed based on the structures and the IR spectra calculated at the B3LYP/cc-pVDZ level. Comparison of the observed and calculated IR spectra demonstrates that an intramolecular hydrogen bond is formed in H$$^{+}$$MIDOA and the M(VII)O$$_{4}$$$$^{-}$$ ion interact with H$$^{+}$$MIDOA through multiple C-H$$_{n}$$...O hydrogen bonds.

Journal Articles

Extreme ultraviolet free electron laser seeded with high-order harmonic of Ti:sapphore laser

Togashi, Tadashi*; Takahashi, Eiji*; Midorikawa, Katsumi*; Aoyama, Makoto; Yamakawa, Koichi; Sato, Takahiro*; Iwasaki, Atsushi*; Owada, Shigeki*; Okino, Tomoya*; Yamanouchi, Kaoru*; et al.

Optics Express (Internet), 19(1), p.317 - 324, 2011/01

 Times Cited Count:74 Percentile:2.85(Optics)

The 13th harmonic of a Ti:sapphire (Ti:S) laser in the plateau region was injected as a seeding source to a 250-MeV free-electron-laser (FEL) amplifier. When the amplification conditions were fulfilled, strong enhancement of the radiation intensity by a factor of 650 was observed. The random and uncontrollable spikes, which appeared in the spectra of the Self-Amplified Spontaneous Emission (SASE) based FEL radiation without the seeding source, were found to be suppressed drastically to form to a narrow-band, single peak profile at 61.2 nm. The properties of the seeded FEL radiation were well reproduced by numerical simulations. We discuss the future precept of the seeded FEL scheme to the shorter wavelength region.

Journal Articles

Technetium(VII) and rhenium(VII) extraction by a new diamide reagent, 2,2'-(Imino)bis(${it N,N}$-dialkylacetamide) (IDAA)

Sasaki, Yuji; Sugo, Yumi; Saeki, Morihisa; Morita, Yasuji; Ohashi, Akira*

Solvent Extraction Research and Development, Japan, 18, p.69 - 74, 2011/00

The new diamide-type extractant, 2,2-(Imino)bis(${it N,N}$-dialkylacetamide) (IDAA), was developed for Tc recovery. IDAA has a nitrogen donor atom introduced into the center of backbone and shows the tridentate feature by hybrid donor atoms of two carbonyl oxygen and a nitrogen. 2,2-(Methylimino)bis(${it N,N}$-Dioctylacetamide) (MIDOA), 2,2-(Methylimino)bis(${it N,N}$-Didodecylacetamide) (MIDDA), and 2,2-(Imino)bis(${it N,N}$-Didodecylacetamide) (IDDA), the IDAA derivatives, can be dissolved well in n-dodecane, and are readily used in the solvent extraction. In addition to Tc(VII) and Re(VII), Cr(VI), Mo(VI), W(VI), Pd(II) and Pu(IV) can be extracted from nitric acid to n-dodecane by these extractants, therefore IDAA has high extractability with some oxonium anions. The extraction capacity for Re(VII) was measured and more than 37 mM Re(VII) can be extracted by 0.1 M MIDOA.

Journal Articles

Modeling of radiative properties of Sn plasmas for extreme-ultraviolet source

Sasaki, Akira; Sunahara, Atsushi*; Furukawa, Hiroyuki*; Nishihara, Katsunobu*; Fujioka, Shinsuke*; Nishikawa, Takeshi*; Koike, Fumihiro*; Ohashi, Hayato*; Tanuma, Hajime*

Journal of Applied Physics, 107(11), p.113303_1 - 113303_11, 2010/06

 Times Cited Count:25 Percentile:23.51(Physics, Applied)

Atomic processes in Sn plasmas are investigated for application to extreme-ultraviolet (EUV) light sources used in microlithography. An atomic model of Sn is developed on the basis of calculated atomic data using the Hebrew University Lawrence Livermore Atomic Code (HULLAC). Resonance and satellite lines from singly and multiply excited states of Sn ions are identified. The wavelengths of the 4$$d$$-4$$f$$ + 4$$p$$-4$$d$$ transitions of Sn$$^{5+}$$ to Sn$$^{13+}$$ are investigated. Results of calculation are compared with those of the charge exchange spectroscopy, measurement of the emission spectrum of the laser produced plasma EUV source, and the opacity measurement of a radiatively heated Sn sample. A reasonable agreement is observed between calculated and experimental EUV emission spectra. The spectral emissivity and opacity of Sn plasmas are calculated using a full collisional radiative (CR) model as a function of electron temperature and ion density.

Journal Articles

Complementary spectroscopy of tin ions using ion and electron beams

Ohashi, Hayato*; Suda, Shintaro*; Tanuma, Hajime*; Fujioka, Shinsuke*; Nishimura, Hiroaki*; Nishihara, Katsunobu*; Kai, Takeshi; Sasaki, Akira; Sakaue, Hiroyuki*; Nakamura, Nobuyuki*; et al.

Journal of Physics; Conference Series, 163, p.012071_1 - 012071_4, 2009/06

 Times Cited Count:6 Percentile:10.11

Extreme ultra-violet (EUV) emission spectra of multiply charged tin ions were measured in the wavelength range of 10-22 nm following charge exchange collisions or the electron impact excitation of tin ions. In charge exchange collisions, we observed both the resonance lines and the emission lines corresponding to the transitions between the excited states. On the other hand, we observed mainly the resonance lines in the electron impact experiments. We can distinguish the resonance lines from other emission lines in the charge exchange spectrum by comparison with the emission lines in the electron impact spectrum.

Journal Articles

EUV spectra from highly charged tin ions observed in low density plasma in LHD

Suzuki, Chihiro*; Kato, Takako*; Sato, Kuninori*; Tamura, Naoki*; Kato, Daiji*; Sudo, Shigeru*; Yamamoto, Norimasa*; Tanuma, Hajime*; Ohashi, Hayato*; Suda, Shintaro*; et al.

Journal of Physics; Conference Series, 163, p.012019_1 - 012019_4, 2009/06

 Times Cited Count:8 Percentile:6.13

We have measured EUV spectra from highly charged tin ions in low density plasmas produced in the Large Helical Device (LHD). The well known dense spectral structure around 13.5 nm is measured when the plasma is rapidly cooled and approaching radioactive collapse, while the sparse spectrum with several unidentified discrete lines from 13.8-14.6 nm is observed if the plasma is cooled more slowly. The dominant charge states in the former case are Sn$$^{11+}$$ -Sn$$^{14+}$$. The latter case may be explained by considering the spectral lines from charge states higher than Sn$$^{19+}$$.

JAEA Reports

Study of site layout in the Rokkasho site

Sato, Kazuyoshi; Uehara, Masaharu*; Tamura, Kosaku*; Hashimoto, Masayoshi*; Ogino, Shunji*; Yagenji, Akira; Nagamatsu, Nobuhide*; Sekiya, Shigeki*; Takahashi, Hideo*; Motohashi, Keiichi*; et al.

JAEA-Technology 2006-024, 114 Pages, 2006/03

JAEA-Technology-2006-024.pdf:24.72MB

no abstracts in English

JAEA Reports

Study of the layout plan in the Tokamak complex building for ITER

Sato, Kazuyoshi; Hashimoto, Masayoshi*; Nagamatsu, Nobuhide*; Yagenji, Akira; Sekiya, Shigeki*; Takahashi, Hideo*; Motohashi, Keiichi*; Ogino, Shunji*; Kataoka, Takahiro*; Ohashi, Hironori*; et al.

JAEA-Technology 2006-006, 587 Pages, 2006/03

JAEA-Technology-2006-006.pdf:46.04MB

no abstracts in English

Journal Articles

Evaluation of mechanical properties and microstructure in ion-irradiated surface layer

Naoe, Takashi*; Futakawa, Masatoshi; Naito, Akira*; Kogawa, Hiroyuki; Ikeda, Yujiro; Motohashi, Yoshinobu*

JSME International Journal, Series A, 48(4), p.280 - 285, 2005/10

Target vessel materials used in spallation neutron source will be exposed to proton and neutron irradiation and mercury immersion environments. In order to evaluate the surface degradation of the vessel candidate materials due to such environment, the triple-ion beam irradiation taking the spallation reaction into account and mercury immersion tests were carried out. Mechanical properties of the gradient surface layer ware evaluated by the inverse analysis with multi-layer model that considers distribution of surface characteristic was applied to the load and depth curves measured by using the instrumented indentation machine. Transmission electron microscopic observations ware performed to evaluate the changes of microstructure in irradiated surface layer using focused ion-beam cut micro-specimen. It was confirmed that the ductility loss is enhanced by the irradiation and mercury immersion, and simulated stress and strain curves of the ion-irradiated surface layer ware adequately in good agreement with the curves of experimental equivalent neutron-irradiated material.

JAEA Reports

Annual report on experimental operation of mock-up model test facility with a full-scale reaction tube for HTTR hydrogen production system in 2001 fiscal year (Contract research)

Hayashi, Koji; Inagaki, Yoshiyuki; Kato, Michio; Fujisaki, Katsuo*; Aita, Hideki; Takeda, Tetsuaki; Nishihara, Tetsuo; Inaba, Yoshitomo; Ohashi, Hirofumi; Katanishi, Shoji; et al.

JAERI-Tech 2005-032, 46 Pages, 2005/06

JAERI-Tech-2005-032.pdf:4.79MB

This is annual report on the experimental operation of the mock-up test facility with a full-scale reaction tube for the HTTR hydrogen production system in 2001 fiscal year. The first experimental operation was performed during two weeks from March 1, 2002 to March 13, 2002 to test on the thermal hydraulic performance of the steam reformer and also to train the operators. The thermal hydraulic performance test of the steam reformer was performed to evaluate the heat transfer characteristics between helium gas and process gas in the steam reformer. This report is summarized with an overview of the test, the results and its operation records.

JAEA Reports

Heat transfer characteristics evaluation of heat exchangers of mock-up test facility with full-scale reaction tube for HTTR hydrogen production system (Contract research)

Shimizu, Akira; Ohashi, Hirofumi; Kato, Michio; Hayashi, Koji; Aita, Hideki; Nishihara, Tetsuo; Inaba, Yoshitomo; Takada, Shoji; Morisaki, Norihiro; Sakaki, Akihiro*; et al.

JAERI-Tech 2005-031, 174 Pages, 2005/06

JAERI-Tech-2005-031.pdf:20.71MB

Connection of hydrogen production system by steam reforming of methane to the High Temperature Engineering Test Reactor (HTTR) of the Japan Atomic Energy Research Institute (JAERI) has been surveyed until now. Mock-up test facility of this steam reforming system with full-scale reaction tube was constructed in FY 2001, and a lot of operational test data on heat exchanges were obtained in these tests.In this report specifications, structures and heat transfer formulae of steam reformer, steam superheater, steam generator, condenser, helium gas cooler, feed gas heater and feed gas superheater were described. Evaluation codes were newly made to evaluate heat transfer characteristics from measured test data. Overall heat-transfer coefficient obtained from the experimental data were compared and evaluated with the prospective value calculated with heat transfer formulae. As a result, heat transfer performance and thermal efficiency of these heat exchangers were confirmed to be appropriate.

JAEA Reports

Improvement works report on mock-up model test facility with a full-scale reaction tube for HTTR hydrogen production system (Contract research)

Sakaki, Akihiro*; Kato, Michio; Hayashi, Koji; Fujisaki, Katsuo*; Aita, Hideki; Ohashi, Hirofumi; Takada, Shoji; Shimizu, Akira; Morisaki, Norihiro; Maeda, Yukimasa; et al.

JAERI-Tech 2005-023, 72 Pages, 2005/04

JAERI-Tech-2005-023.pdf:14.86MB

In order to establish the system integration technology to connect a hydrogen production system to a high temperature gas cooled reactor, the mock-up test facility with a full-scale reaction tube for the steam reforming HTTR hydrogen production system was constructed in fiscal year 2001 and its functional test operation was performed in the year. Seven experimental test operations were performed from fiscal year 2001 to 2004. On a period of each test operation, there happened some troubles. For each trouble, the cause was investigated and the countermeasures and the improvement works were performed to succeed the experiments. The tests were successfully achieved according to plan.This report describes the improvement works on the test facility performed from fiscal year 2001 to 2004.

JAEA Reports

Performance test results of mock-up model test facility with a full-scale reaction tube for HTTR hydrogen production system (Contract research)

Inagaki, Yoshiyuki; Hayashi, Koji; Kato, Michio; Fujisaki, Katsuo; Aita, Hideki; Takeda, Tetsuaki; Nishihara, Tetsuo; Inaba, Yoshitomo; Ohashi, Hirofumi; Katanishi, Shoji; et al.

JAERI-Tech 2003-034, 129 Pages, 2003/05

JAERI-Tech-2003-034.pdf:7.62MB

no abstracts in English

JAEA Reports

Performance test results of helium gas circulator of mock-up test facility with full-scale reaction tube for HTTR hydrogen production system (Contract research)

Shimizu, Akira; Kato, Michio; Hayashi, Koji; Fujisaki, Katsuo; Aita, Hideki; Takeda, Tetsuaki; Nishihara, Tetsuo; Katanishi, Shoji; Takada, Shoji; Inaba, Yoshitomo; et al.

JAERI-Tech 2003-033, 105 Pages, 2003/03

JAERI-Tech-2003-033.pdf:8.35MB

no abstracts in English

Oral presentation

Extraction of technetium(VII) and rhenium(VII) by the new reagent, 2-(Imino)bis(N,N-dialkylacetamide) (IDAA)

Sasaki, Yuji; Sugo, Yumi; Saeki, Morihisa; Morita, Yasuji; Ohashi, Akira*

no journal, , 

The new diamide-type extractant, (Imino)bis(N,N-dialkylacetamide) (IDAA), was developed for Tc recovery. IDAA has a nitrogen donor atom introduced into the center of backbone and shows the tridentate feature by hybrid donor atoms of two carbonyl oxygen and a nitrogen. (Methylimino)bis(N,N-Dioctylacetamide) (MIDOA) and (Imino)bis(N,N-Dioctylacetamide) (IDOA), the IDAA derivatives, can be dissolved well in n-dodecane, and are readily used in the solvent extraction. In addition to Tc(VII) and Re(VII), Cr(VI), Mo(VI), W(VI), Pd(II) and Pu(IV) can be extracted from nitric acid to n-dodecane by MIDOA, therefore IDAA has high extractability with some oxonium anions. The extraction capacity for Re(VII) was measured and more than 37 mM Re(VII) can be extracted by 0.1M MIDOA.

Oral presentation

Extraction and separation of cadmium(II) from process residue of scallop by "emulsion flow"

Ishioka, Minami; Yanase, Nobuyuki; Nagano, Tetsushi; Mitamura, Hisayoshi; Ohashi, Akira*; Yamaguchi, Akira*; Kim, H.-B.*; Naganawa, Hirochika

no journal, , 

no abstracts in English

Oral presentation

2-(Imino)bis(N,N-dialkylacetamide) (IDAA), a novel complexing agent for Palladiumu(II), technetium(VII) and rhenium(VII)

Sasaki, Yuji; Saeki, Morihisa; Sugo, Yumi; Morita, Yasuji; Ohashi, Akira*; Oriyama, Takeshi*; Ikeda, Yasuhisa*; Ali, M.*

no journal, , 

no abstracts in English

36 (Records 1-20 displayed on this page)