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Journal Articles

Role of Alkyl Chain Branching in the Self-Assembly of Nitrilotriacetamide-Based Lanthanide Extractants

Ueda, Yuki; Kobayashi, Toru; Nakamura, Satoshi; Ban, Yasutoshi; Kaneta, Yui; Nabatame, Nozomi; Micheau, C.; Tokunaga, Kohei; Nakabe, Rintaro; Kaneko, Masashi*; et al.

Langmuir, 42(1), p.1613 - 1626, 2026/01

https://doi.org/10.1021/acs.langmuir.5c05651

Understanding the structural factors governing the metal ions selectivity of solvent extraction systems is crucial for developing advanced processes for partitioning and transmutation of high-level radioactive waste. Here, we systematically investigated the effect of alkyl side-chain branching in nitrilotriacetamide (NTAamide) extractants on the extraction of lanthanum (La) and neodymium (Nd), chosen as representative lanthanides. Four extractants having each eight carbon atoms as one of the amide chains with identical molecular weights but different degrees of alkyl branching were examined. Distribution ratios were measured as a function of HNO$$_{3}$$ concentration, and the local coordination structures of La and Nd were analyzed by extended X-ray absorption fine structure (EXAFS), while supramolecular aggregation in the organic phase was characterized by small-angle neutron scattering (SANS). EXAFS analysis revealed that the inner-sphere coordination environment of La and Nd was essentially unaffected by the degree of alkyl branching. In contrast, SANS results showed that extractants with fewer branched alkyl groups formed larger aggregates at low HNO$$_{3}$$ concentrations, particularly in the case of Nd, where aggregation was found to facilitate extraction and prevent precipitation of poorly soluble complexes. These findings demonstrate that alkyl branching strongly influences supramolecular aggregation, which in turn governs extraction behavior. This work highlights the potential of nanoscale structural control as a new design concept for improving selectivity in lanthanide and actinide solvent extraction systems.

Journal Articles

Magnetism of Al$$_{x}$$Fe$$_{2-x}$$GeO$$_{5}$$ with andalusite structure

Kakimoto, Kazuo*; Takada, Saki*; Ota, Hiroto*; Hayaguchi, Yuya*; Hagihara, Masato; Torii, Shuki*; Kamiyama, Takashi*; Mitamura, Hiroyuki*; Tokunaga, Masashi*; Hatakeyama, Atsushi*; et al.

Journal of the Physical Society of Japan, 91(5), p.054704_1 - 054704_7, 2022/05

https://doi.org/10.7566/JPSJ.91.054704
 Times Cited Count：1 Percentile：13.48(Physics, Multidisciplinary)

Journal Articles

Multipole polaron in the devil's staircase of CeSb

Arai, Yosuke*; Kuroda, Kenta*; Nomoto, Takuya*; Tin, Z. H.*; Sakuragi, Shunsuke*; Bareille, C.*; Akebi, Shuntaro*; Kurokawa, Kifu*; Kinoshita, Yuto*; Zhang, W.-L.*; et al.

Nature Materials, 21(4), p.410 - 415, 2022/04

https://doi.org/10.1038/s41563-021-01188-9
 Times Cited Count：16 Percentile：77.58(Chemistry, Physical)

Journal Articles

Coexistence of magnetoelectric and antiferroelectric-like orders in Mn$$_{3}$$Ta$$_{2}$$O$$_{8}$$

Kimura, Kenta*; Yagi, Naoki*; Hasegawa, Shunsuke*; Hagihara, Masato; Miyake, Atsushi*; Tokunaga, Masashi*; Cao, H.*; Masuda, Takatsugu*; Kimura, Tsuyoshi*

Inorganic Chemistry, 60(20), p.15078 - 15084, 2021/10

https://doi.org/10.1021/acs.inorgchem.1c02461
 Times Cited Count：4 Percentile：39.78(Chemistry, Inorganic & Nuclear)

Journal Articles

Anisotropic physical properties of layered antiferromagnet U$$_2$$Pt$$_6$$Ga$$_{15}$$

Matsumoto, Yuji*; Haga, Yoshinori; Yamamoto, Etsuji; Takeuchi, Tetsuya*; Miyake, Atsushi*; Tokunaga, Masashi*

Journal of the Physical Society of Japan, 90(7), p.074707_1 - 074707_6, 2021/07

https://doi.org/10.7566/JPSJ.90.074707
 Times Cited Count：2 Percentile：19.96(Physics, Multidisciplinary)

Journal Articles

Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi; $$mu$$SR and NMR studies

Higa, Nonoka*; Ito, Takashi; Yogi, Mamoru*; Hattori, Taisuke; Sakai, Hironori; Kambe, Shinsaku; Guguchia, Z.*; Higemoto, Wataru; Nakashima, Miho*; Homma, Yoshiya*; et al.

Physical Review B, 104(4), p.045145_1 - 045145_7, 2021/07

https://doi.org/10.1103/PhysRevB.104.045145
 Times Cited Count：5 Percentile：26.77(Materials Science, Multidisciplinary)

Journal Articles

Spin excitations of the $$S$$=1/2 one-dimensional Ising-like antiferromagnet BaCo$$_{2}$$V$$_{2}$$O$$_{8}$$ in transverse magnetic fields

Okutani, Akira*; Onishi, Hiroaki; Kimura, Shojiro*; Takeuchi, Tetsuya*; Kida, Takanori*; Mori, Michiyasu; Miyake, Atsushi*; Tokunaga, Masashi*; Kindo, Koichi*; Hagiwara, Masayuki*

Journal of the Physical Society of Japan, 90(4), p.044704_1 - 044704_9, 2021/04

https://doi.org/10.7566/JPSJ.90.044704
 Times Cited Count：5 Percentile：46.78(Physics, Multidisciplinary)

Journal Articles

Strong magnetic anisotropy and unusual magnetic field reinforced phase in URhSn with a quasi-kagome structure

Shimizu, Yusei*; Miyake, Atsushi*; Maurya, A.*; Honda, Fuminori*; Nakamura, Ai*; Sato, Yoshiki*; Li, D.*; Homma, Yoshiya*; Yokoyama, Makoto*; Tokunaga, Yo; et al.

Physical Review B, 102(13), p.134411_1 - 134411_11, 2020/10

https://doi.org/10.1103/PhysRevB.102.134411
 Times Cited Count：10 Percentile：43.69(Materials Science, Multidisciplinary)

Journal Articles

Intriguing behavior of UCo$$_{1-x}$$Rh$$_x$$Ge ferromagnets in magnetic field along the $$b$$ axis

Posp$'i$$v{s}$il, J.*; Haga, Yoshinori; Miyake, Atsushi*; Kambe, Shinsaku; Tokunaga, Yo; Tokunaga, Masashi*; Yamamoto, Etsuji; Proschek, P.*; Voln$'y$, J.*; Sechovsk$'y$, V.*

Physical Review B, 102(2), p.024442_1 - 024442_13, 2020/07

https://doi.org/10.1103/PhysRevB.102.024442
 Times Cited Count：7 Percentile：32.10(Materials Science, Multidisciplinary)

Journal Articles

Devil's staircase transition of the electronic structures in CeSb

Kuroda, Kenta*; Arai, Yosuke*; Rezaei, N.*; Kunisada, So*; Sakuragi, Shunsuke*; Alaei, M.*; Kinoshita, Yuto*; Bareille, C.*; Noguchi, Ryo*; Nakayama, Mitsuhiro*; et al.

Nature Communications (Internet), 11, p.2888_1 - 2888_9, 2020/06

https://doi.org/10.1038/s41467-020-16707-6
 Times Cited Count：39 Percentile：82.98(Multidisciplinary Sciences)

Journal Articles

Magnetic structures and quadratic magnetoelectric effect in LiNiPO$$_{4}$$ beyond 30 T

Fogh, E.*; Kihara, Takumi*; Toft-Petersen, R.*; Bartkowiak, M.*; Narumi, Yasuo*; Prokhnenko, O.*; Miyake, Atsushi*; Tokunaga, Masashi*; Oikawa, Kenichi; S${o}$rensen, M. K.*; et al.

Physical Review B, 101(2), p.024403_1 - 024403_12, 2020/01

https://doi.org/10.1103/PhysRevB.101.024403
 Times Cited Count：22 Percentile：70.82(Materials Science, Multidisciplinary)

Journal Articles

Magnetic fluctuation and first-order transition in trillium lattice of EuPtSi observed by $$^{151}$$Eu M$"o$ssbauer spectroscopy

Homma, Yoshiya*; Kakihana, Masashi*; Tokunaga, Yo; Yogi, Mamoru*; Nakashima, Miho*; Nakamura, Ai*; Shimizu, Yusei*; Li, D.*; Maurya, A.*; Sato, Yoshiki*; et al.

Journal of the Physical Society of Japan, 88(9), p.094702_1 - 094702_8, 2019/08

https://doi.org/10.7566/JPSJ.88.094702
 Times Cited Count：11 Percentile：57.76(Physics, Multidisciplinary)

Journal Articles

Magnetic and electrical properties of the ternary compound U$$_2$$Ir$$_3$$Si$$_5$$ with one-dimensional uranium zigzag chains

Li, D. X.*; Honda, Fuminori*; Miyake, Atsushi*; Homma, Yoshiya*; Haga, Yoshinori; Nakamura, Ai*; Shimizu, Yusei*; Maurya, A.*; Sato, Yoshiki*; Tokunaga, Masashi*; et al.

Physical Review B, 99(5), p.054408_1 - 054408_9, 2019/02

https://doi.org/10.1103/PhysRevB.99.054408
 Times Cited Count：7 Percentile：29.45(Materials Science, Multidisciplinary)

Journal Articles

Magnetic field induced phenomena in UIrGe in fields applied along the $$b$$ axis

Posp$'i$$v{s}$il, J.*; Haga, Yoshinori; Kohama, Yoshimitsu*; Miyake, Atsushi*; Kambe, Shinsaku; Tateiwa, Naoyuki; Vali$v{s}$ka, M.*; Proschek, P.*; Prokle$v{s}$ka, J.*; Sechovsk$'y$, V.*; et al.

Physical Review B, 98(1), p.014430_1 - 014430_7, 2018/07

https://doi.org/10.1103/PhysRevB.98.014430
 Times Cited Count：16 Percentile：54.34(Materials Science, Multidisciplinary)

Journal Articles

Phonon density of states in Sr$$_{2}$$FeCoO$$_{6-delta}$$ and SrBaFeCoO$$_{6-delta}$$; Effects induced by magnetic order and transport coherence

Rykov, A. I.*; Nomura, Kiyoshi*; Sawada, Tsuguo*; Mitsui, Takaya; Seto, Makoto*; Tamegai, Tsuyoshi*; Tokunaga, Masashi*

Physical Review B, 68(22), p.224401_1 - 224401_7, 2003/12

https://doi.org/10.1103/PhysRevB.68.224401
 Times Cited Count：8 Percentile：41.91(Materials Science, Multidisciplinary)

no abstracts in English

Oral presentation

Crystal structure and physical properties of U$$_2$$Pt$$_6$$Al$$_{15}$$ with the layered structure

Haga, Yoshinori; Tokiwa, Yoshifumi; Yamamoto, Etsuji; Miyake, Atsushi*; Tokunaga, Masashi*

no journal, , 

no abstracts in English

Oral presentation

High field magnetization of UOX (X = S and Se)

Opletal, P.; Sakai, Hironori; Haga, Yoshinori; Miyake, Atsushi*; Tokunaga, Masashi*; Tokiwa, Yoshifumi; Yamamoto, Etsuji; Kambe, Shinsaku; Tokunaga, Yo

no journal, , 

Oral presentation

Relationship between local structure and magnetic/dielectric properties in (1-${it x}$)BiFeO$$_{3}$$-${it x}$BaTiO$$_{3}$$

Ozaki, Tomoatsu*; Nishihara, Sadafumi*; Hosokoshi, Yuko*; Tokunaga, Masashi*; Noguchi, Yuji*; Miyayama, Masaru*; Yoshii, Kenji; Mori, Shigeo*

no journal, , 

We have investigated the local structure and physical properties of (1-${it x}$)BiFeO$$_{3}$$-${it x}$BaTiO$$_{3}$$. Electron-diffraction measurements showed the coexistence of magnetic and ferroelectric nano domains at around x=0.35. Dielectric measurements under magnetic field showed the lack of magneto-dielectric effect, indicating a weak correlation between the magnetic and ferroelectric properties. Magnetization-magnetic field curves showed the existence of magnetic nano domains.

Oral presentation

Physical properties of semimetallic magnets UOX (X = S, Se, Te)

Opletal, P.; Sakai, Hironori; Haga, Yoshinori; Miyake, Atsushi*; Tokunaga, Masashi*; Tokiwa, Yoshifumi; Yamamoto, Etsuji; Kambe, Shinsaku; Tokunaga, Yo

no journal, , 

Oral presentation

Effect of alkyl chains on the extraction of lanthanide elements

Ueda, Yuki; Kobayashi, Toru; Nakamura, Satoshi; Ban, Yasutoshi; Kaneta, Yui; Nabatame, Nozomi; Tokunaga, Kohei; Kaneko, Masashi*; Motokawa, Ryuhei

no journal, , 

no abstracts in English

Oral presentation

Physical properties of semimetallic magnets UOX (X = S, Se, Te)

Opletal, P.; Sakai, Hironori; Haga, Yoshinori; Miyake, Atsushi*; Tokunaga, Masashi*; Tokiwa, Yoshifumi; Yamamoto, Etsuji; Kambe, Shinsaku; Tokunaga, Yo

no journal, , 

21 (Records 1-20 displayed on this page)