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Journal Articles

Simultaneous sequestration of Co$$^{2+}$$ and Mn$$^{2+}$$ by fungal manganese oxide through asbolane formation

Aoshima, Miku*; Tani, Yukinori*; Fujita, Rina*; Tanaka, Kazuya; Miyata, Naoyuki*; Umezawa, Kazuhiro*

Minerals (Internet), 12(3), p.358_1 - 358_16, 2022/03

https://doi.org/10.3390/min12030358
 Times Cited Count：5 Percentile：77.65(Geochemistry & Geophysics)

In this study, we conducted sequestration experiments of Co$$^{2+}$$ by ${it Acremonium strictum}$ KR21-2 in a Mn$$^{2+}$$/Co$$^{2+}$$ binary solution at pH7. The sequestration of Co$$^{2+}$$ by newly formed BMOs readily progressed in parallel with the exogenous Mn$$^{2+}$$, with higher efficiency than that in single Co$$^{2+}$$ solutions. This is attributed to a synergetic effect on Co$$^{2+}$$ sequestration through the formation of asbolane in Mn$$^{2+}$$/Co$$^{2+}$$ binary systems.

Journal Articles

Origin of magnetovolume effect in a cobaltite

Miao, P.*; Tan, Z.*; Lee, S. H.*; Ishikawa, Yoshihisa*; Torii, Shuki*; Yonemura, Masao*; Koda, Akihiro*; Komatsu, Kazuki*; Machida, Shinichi*; Sano, Asami; et al.

Physical Review B, 103(9), p.094302_1 - 094302_18, 2021/03

https://doi.org/10.1103/PhysRevB.103.094302
 Times Cited Count：2 Percentile：17.84(Materials Science, Multidisciplinary)

The layered perovskite PrBaCo$$_{2}$$O$$_{5.5}$$ demonstrates a strong negative thermal expansion (NTE) which holds potential for being fabricated into composites with zero thermal expansion. The NTE was found to be intimately associated with the spontaneous magnetic ordering, known as magneto-volume effect (MVE). Here we report with compelling evidences that the continuous-like MVE in PrBaCo$$_{2}$$O$$_{5.5}$$ is intrinsically of discontinuous character, originating from an magnetoelectric transition from an antiferromagnetic insulating large-volume (AFILV) phase to a ferromagnetic less-insulating small-volume (FLISV) phase. Furthermore, the magnetoelectric effect (ME) shows high sensitivity to multiple external stimuli such as temperature, carrier doping, hydrostatic pressure, magnetic field etc. In contrast to the well-known ME such as colossal magnetoresistance and multi-ferroic effect which involve symmetry breaking of crystal structure, the ME in the cobaltite is purely isostructural. Our discovery provides a new path way to realizing the ME as well as the NTE, which may find applications in new techniques.

Journal Articles

Reduction behaviors of permanganate by microbial cells and concomitant accumulation of divalent cations of Mg$$^{2+}$$, Zn$$^{2}$$+, and Co$$^{2+}$$

Kato, Tomoaki*; Yu, Q.*; Tanaka, Kazuya; Kozai, Naofumi; Saito, Takumi*; Onuki, Toshihiko

Journal of Environmental Sciences, 86, p.78 - 86, 2019/12

https://doi.org/10.1016/j.jes.2019.05.007
 Times Cited Count：2 Percentile：8.42(Environmental Sciences)

This paper investigated the fate of the dissolved permanganate in aqueous solution after contact with bacterial cells and metal accumulation during precipitation of Mn oxides. When Mn(VII) was contacted with bacterial cells, cells were damaged and Mn(VII) was reduced by cells to lower valence and precipitated as Mn oxides (biomass Mn oxides). When Co$$^{2+}$$ ions were present, Co was incorporated into Mn oxides as Co$$^{3+}$$. These results suggest that Mn(VII) can be used to remove metal ions when introduced to wastewater as disinfectant.

Journal Articles

X-ray absorption spectroscopy and magnetocaloric study of Pr$$_{1-x}$$Sr$$_{x}$$CoO$$_{3}$$ (0$$leq x leq$$0.5)

Matsumura, Daiju; Tsuji, Takuya; Yoshii, Kenji

Materials Chemistry and Physics, 238, p.121885_1 - 121885_5, 2019/12

https://doi.org/10.1016/j.matchemphys.2019.121885
 Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary)

We have conducted X-ray absorption spectroscopy study for perovskite cobaltite Pr$$_{1-x}$$Sr$$_{x}$$CoO$$_{3}$$ (0$$leq x leq$$0.5) to understand Sr doping effect and magnetocaloric measurement for Pr$$_{0.5}$$Sr$$_{0.5}$$CoO$$_{3}$$ to reveal the origin of magnetic anomaly at around 110 K. The extended X-ray absorption fine structure (EXAFS) measurements at the Co ${it K}$-edge suggest that the average valence value of Co ions increases, the interatomic distance of Co-O bonding decreases, and the local distortion of CoO$$_{6}$$ octahedron increases as Sr is doped in PrCoO$$_{3}$$. The interatomic distance of Co-O bonding shrinks more greatly for the larger doping region. No temperature dependent electronic and structural changes were observed from Co ${it K}$-edge X-ray absorption spectra in the whole thermal range studied (17-300 K). The magnetocaloric effect of Pr$$_{0.5}$$Sr$$_{0.5}$$CoO$$_{3}$$ indicates the change of magnetic structure at 110 K.

Journal Articles

Removal of cesium ions from contaminated seawater in closed area using adsorptive fiber

Someya, Takaaki*; Asai, Shiho; Fujiwara, Kunio*; Sugo, Takanobu*; Umeno, Daisuke*; Saito, Kyoichi*

Nihon Kaisui Gakkai-Shi, 69(1), p.42 - 48, 2015/02

A large amount of seriously contaminated sea water with radioactive Cs has been reserved in semi-enclosed coastal sea area which is separated by silt fences and embankments. Insoluble cobalt ferrocyanide (Co-FC) microparticles-impregnated fiber was developed for removing Cs from the contaminated sea water. The resultant Co-FC-impregnated fiber was immersed in either nonradioactive or radioactive Cs solution. The adsorption isotherm well correlated with a Langmuir-type equation. In addition, mass-transfer capacity coefficients were determined by fitting the experimental data of the rate of Cs adsorption onto the Co-FC-impregnated fiber to theoretical adsorption curves based on the Cs concentration difference between the bulk and the interface in seawater as a driving force of the overall adsorption rate. Decontamination factors as functions of fiber weight and the contact time required for the removal of cesium ions from the contaminated seawater in a closed area were estimated.

Journal Articles

Spin, charge, and orbital correlations in the one-dimensional $$t_{rm 2g}$$-orbital Hubbard model

Xavier, J. C.*; Onishi, Hiroaki; Hotta, Takashi; Dagotto, E.*

Physical Review B, 73(1), p.014405_1 - 014405_9, 2006/01

https://doi.org/10.1103/PhysRevB.73.014405
 Times Cited Count：9 Percentile：41.55(Materials Science, Multidisciplinary)

We present the zero-temperature phase diagram of the one-dimensional $$t_{rm 2g}$$-orbital Hubbard model, by using the density-matrix renormalization group and Lanczos techniques. Emphasis is given to the case for the electron density $$n$$=5, of relevance to Co-based compounds. Several other cases for electron densities between $$n$$=3 and 6 are also studied. At $$n$$=5, our results indicate a first-order transition between a paramagnetic (PM) insulator phase and a ferromagnetic (FM) state by tuning the Hund's coupling. The results also suggest a transition from the $$n$$=5 PM insulator phase to a metallic regime by changing the electron density. The behavior of the spin, charge, and orbital correlation functions in the FM and PM states are discussed.

Journal Articles

Polymeric Co-C$$_{60}$$ compound phase evolved in atomistically mixed thin films

Sakai, Seiji; Naramoto, Hiroshi*; Lavrentiev, V.*; Narumi, Kazumasa; Maekawa, Masaki; Kawasuso, Atsuo; Yaita, Tsuyoshi; Baba, Yuji

Materials Transactions, 46(4), p.765 - 768, 2005/04

https://doi.org/10.2320/matertrans.46.765
 Times Cited Count：17 Percentile：70.79(Materials Science, Multidisciplinary)

A systematic study of the atom-level mixtures between Co and C$$_{60}$$ has made possible to find a new C$$_{60}$$-based compound phase, Co$$_{x}$$C$$_{60}$$ (x$$leq$$5). It is confirmed with the EXAFS analysis and the positron annihilation study that the polymeric structure is developed three-dimensionally by bridging two C$$_{60}$$ molecules with the covalently bonded Co atom.

Journal Articles

Possible pairing symmetry of superconductor Na$$_x$$CoO$$_2$$$$cdot y$$H$$_2$$O

Nishikawa, Yunori; Ikeda, Hiroaki*; Yamada, Kosaku*

Journal of the Physical Society of Japan, 73(5), p.1127 - 1130, 2004/05

https://doi.org/10.1143/JPSJ.73.1127
 Times Cited Count：17 Percentile：65.19(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Useful tool for human life and industry; Irradiation facilities of cobalt-60 $$gamma$$ rays

Haruyama, Yasuyuki

Kigyo Sapoto Gumma, P. 13, 2004/04

Outline of cobalt-60 $$gamma$$-ray facilities for radiation processing is described. It consists of characteristics of cobalt-60 source, components of the facility, and radiation safety systems. Typical products in $$gamma$$-ray processing are also shown.

Journal Articles

Doping effects of Ru in ${it L}$$$_{0.5}$$Sr$$_{0.5}$$CoO$$_{3}$$ (${it L}$=La, Pr, Nd, Sm, and Eu)

Yoshii, Kenji; Abe, Hideki*

Physical Review B, 67(9), p.094408_1 - 094408_8, 2003/03

https://doi.org/10.1103/PhysRevB.67.094408
 Times Cited Count：40 Percentile：82.47(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

MCD studies in 2p and 3d XAS of La$$_{1-x}$$Sr$$_{x}$$CoO$$_{3}$$

Mizumaki, Masaichiro*; Yoshii, Kenji; Kawamura, Naomi*; Nakazawa, Makoto*

Surface Review and Letters, 9(2), p.855 - 859, 2002/04

https://doi.org/10.1142/S0218625X02003056
 Times Cited Count：1 Percentile：7.78(Chemistry, Physical)

no abstracts in English

Journal Articles

Magnetism and transport of Ln$$_{0.5}$$Sr$$_{0.5}$$CoO$$_{3}$$ (Ln=Pr, Nd, Sm, Eu and Gd)

Yoshii, Kenji; Nakamura, Akio; Abe, Hideki*; Mizumaki, Masaichiro*; Muro, Takayuki*

Journal of Magnetism and Magnetic Materials, 239(1-3), p.85 - 87, 2002/02

https://doi.org/10.1016/S0304-8853(01)00556-X
 Times Cited Count：15 Percentile：59.47(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Magnetic properties of some transition metal perovskite oxide systems; Transition metal = Ti, Cr, and Co

Yoshii, Kenji; Nakamura, Akio

Recent Research Developments in Physics, 3, p.758 - 776, 2002/00

no abstracts in English

Journal Articles

Magnetism and transport of ${it Ln}$$$_{0.5}$$Sr$$_{0.5}$$CoO$$_{3}$$(${it Ln}$=Pr, Nd, Sm and Eu)

Yoshii, Kenji; Abe, Hideki*; Nakamura, Akio

Materials Research Bulletin, 36(7-8), p.1447 - 1454, 2001/06

https://doi.org/10.1016/S0025-5408(01)00605-5
 Times Cited Count：41 Percentile：79.02(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Magnetic and structural properties of Pr$$_{1-x}$$A$$_{x}$$CoO$$_{3}$$(A=Sr and Ba)

Yoshii, Kenji; Tsutsui, Satoshi; Nakamura, Akio

Journal of Magnetism and Magnetic Materials, 226-230(Part.1), p.829 - 830, 2001/05

no abstracts in English

Journal Articles

Magnetism and transport of Ln$$_{0.5}$$Sr$$_{0.5}$$Fe$$_{0.5}$$Co$$_{0.5}$$O$$_{3}$$(Ln=La and Pr)

Yoshii, Kenji; Abe, Hideki*

Transactions of the Materials Research Society of Japan, 26(1), p.75 - 78, 2001/03

no abstracts in English

JAEA Reports

None

; ; ; Iguchi, Yukihiro; Matsui, Yuji;

JNC TN3410 2000-014, 43 Pages, 2000/09

JNC-TN3410-2000-014.pdf:2.37MB

None

JAEA Reports

Decontamination factor of the commerciaI detergents for the skin (Part 3)

Miyabe, Kenjiro; Takasaki, Koji; Yasunaga, Hideo*; Izumi, Yuichi*

JNC TN8420 2000-007, 100 Pages, 2000/08

JNC-TN8420-2000-007.pdf:7.66MB

The commercial detergents, which are cleansing cream, shampoo, neutral detergent, etc., were examined in order to select the body cleaners that are substitutes for the titanium dioxide paste. JNC entrusted Japan Environment Research Corporation Limited with these examinations since 1997. In 1997 and 1998, the commercial detergents were examined for Ce-144, Cs-137 and Ru-106. In 1999, 22 detergents were examined for Co-60 from the result of the past examinations. In this examination, the radioactive solution of Co-60 was dropped on the pig-skin samples. These samples were washed with each detergent after 5 minutes and 40 minutes. The decontamination factors of detergents were estimated by the radioactive ratio of the samples before and after washing. As a result of this examination, the decontamination factors for Co-60 was the same as the decontamination factors for Ce-144 and Cs-137, and 11 detergents were nominated as the cleaner that have the decontamination factor more than that of titanium dioxide paste.

Journal Articles

Magnetic order in perovskite Pr$$_{1-x}$$Ba$$_{x}$$CoO$$_{3}$$ studied by magnetic circular dichroism (MCD) spectroscopy

Yoshii, Kenji; Mizumaki, Masaichiro*; Saito, Yuji; Nakamura, Akio

Journal of Solid State Chemistry, 152(2), p.577 - 581, 2000/07

https://doi.org/10.1006/jssc.2000.8752
 Times Cited Count：13 Percentile：43.88(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Magnetic properties of Pr$$_{1-x}$$Sr$$_{x}$$CoO$$_{3}$$

Yoshii, Kenji; Nakamura, Akio

Physica B; Condensed Matter, 281-282, p.514 - 515, 2000/06

https://doi.org/10.1016/S0921-4526(99)00949-7
 Times Cited Count：26 Percentile：75.23(Physics, Condensed Matter)

no abstracts in English

108 (Records 1-20 displayed on this page)