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Journal Articles

Mechanisms responsible for adsorption of molybdate ions on alumina for the production of medical radioisotopes

Fujita, Yoshitaka; Niizeki, Tomotake*; Fukumitsu, Nobuyoshi*; Ariga, Katsuhiko*; Yamauchi, Yusuke*; Malgras, V.*; Kaneti, Y. V.*; Liu, C.-H.*; Hatano, Kentaro*; Suematsu, Hisayuki*; et al.

Bulletin of the Chemical Society of Japan, 95(1), p.129 - 137, 2022/01

 Times Cited Count:5 Percentile:78.23(Chemistry, Multidisciplinary)

In this work, the mechanisms responsible for the adsorption of molybdate ions on alumina are investigated using in-depth surface analyses carried out on alumina specimens immersed in solutions containing different molybdate ions at different pH values. The obtained results reveal that when alumina is immersed in an acidic solution containing molybdate ions, the hydroxyl groups present on the surface are removed to generate positively charged sites, and molybdate ions (MoO$$_{4}$$$$^{2-}$$ or AlMo$$_{6}$$O$$_{24}$$H$$_{6}$$$$^{3-}$$) are adsorbed by electrostatic interaction. Alumina dissolves slightly in an acidic solution to form AlMo$$_{6}$$O$$_{24}$$H$$_{6}$$$$^{3-}$$, which is more easily desorbed than MoO$$_{4}$$$$^{2-}$$. Furthermore, the enhancement in the Mo adsorption or desorption property may be achieved by enriching the surface of the alumina adsorbent with many -OH groups and optimizing Mo solution to adsorb molybdate ions on alumina as MoO$$_{4}$$$$^{2-}$$ ions. These findings will assist researchers in engineering more efficient and stable alumina-based adsorbents for molybdenum adsorption used in medical radioisotope ($$^{99}$$Mo/$$^{99m}$$Tc) generators.

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

 Times Cited Count:1 Percentile:18.63(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

Mesoporous alumina-titania composites with enhanced molybdenum adsorption towards medical radioisotope production

Benu, D. P.*; Earnshaw, J.*; Ashok, A.*; Tsuchiya, Kunihiko; Saptiama, I.*; Yuliarto, B.*; Suendo, V.*; Mukti, R. R.*; Fukumitsu, Nobuyoshi*; Ariga, Katsuhiko*; et al.

Bulletin of the Chemical Society of Japan, 94(2), p.502 - 507, 2021/02

 Times Cited Count:11 Percentile:68.25(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Modulation of Dirac electrons in epitaxial Bi$$_2$$Se$$_3$$ ultrathin films on van der Waals ferromagnet Cr$$_2$$Si$$_2$$Te$$_6$$

Kato, Takemi*; Sugawara, Katsuaki*; Ito, Naohiro*; Yamauchi, Kunihiko*; Sato, Takumi*; Oguchi, Tamio*; Takahashi, Takashi*; Shiomi, Yuki*; Saito, Eiji; Sato, Takafumi*

Physical Review Materials (Internet), 4(8), p.084202_1 - 084202_6, 2020/08

 Times Cited Count:4 Percentile:21.23(Materials Science, Multidisciplinary)

Journal Articles

Biomolecule-assisted synthesis of hierarchical multilayered boehmite and alumina nanosheets for enhanced molybdenum adsorption

Saptiama, I.*; Kaneti, Y. V.*; Yuliarto, B.*; Kumada, Hiroaki*; Tsuchiya, Kunihiko; Fujita, Yoshitaka; Malgras, V.*; Fukumitsu, Nobuyoshi*; Sakae, Takeji*; Hatano, Kentaro*; et al.

Chemistry; A European Journal, 25(18), p.4843 - 4855, 2019/03

 Times Cited Count:14 Percentile:55.95(Chemistry, Multidisciplinary)

The effective utilization of various biomolecules for creating a series of mesoporous boehmite ($$gamma$$-AlOOH) and gamma-alumina ($$gamma$$-Al$$_{2}$$O$$_{3}$$) nanosheets with unique hierarchical multilayered structures is demonstrated. The nature and concentration of the biomolecules strongly influence the degree of the crystallinity, the morphology, and the textural properties of the resulting $$gamma$$-AlOOH and $$gamma$$-Al$$_{2}$$O$$_{3}$$ nanosheets, allowing for easy tuning. The hierarchical $$gamma$$-AlOOH and $$gamma$$-Al$$_{2}$$O$$_{3}$$ multilayered nanosheets synthesized by using biomolecules exhibit enhanced crystallinity, improved particle separation, and well-defined multilayered structures compared to those obtained without biomolecules. More impressively, these $$gamma$$-AlOOH and $$gamma$$-Al$$_{2}$$O$$_{3}$$ nanosheets possess high surface areas up to 425 and 371 m$$^{2}$$/g, respectively, due to their mesoporous nature and hierarchical multilayered structure. When employed for molybdenum adsorption toward medical radioisotope production, the hierarchical $$gamma$$-Al$$_{2}$$O$$_{3}$$ multilayered nanosheets exhibit Mo adsorption capacities of 33.1$$sim$$40.8mg-Mo/g.

Journal Articles

Development of novel alumina adsorbent applying mesoporous process

Fukumitsu, Nobuyoshi*; Yamauchi, Yusuke*; Saptiama, I.*; Ariga, Katsuhiko*; Hatano, Kentaro*; Kumada, Hiroaki*; Fujita, Yoshitaka; Tsuchiya, Kunihiko

Isotope News, (760), p.15 - 18, 2018/12

no abstracts in English

Journal Articles

Template-free fabrication of mesoporous alumina nanospheres using post-synthesis water-ethanol treatment of monodispersed aluminium glycerate nanospheres for molybdenum adsorption

Saptiama, I.*; Kaneti, Y. V.*; Suzuki, Yoshitaka; Tsuchiya, Kunihiko; Fukumitsu, Nobuyoshi*; Sakae, Takeji*; Kim, J.*; Kang, Y.-M.*; Ariga, Katsuhiko*; Yamauchi, Yusuke*

Small, 14(21), p.1800474_1 - 1800474_14, 2018/05

 Times Cited Count:45 Percentile:89.57(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Molybdenum adsorption properties of alumina-embedded mesoporous silica for medical radioisotope production

Saptiama, I.*; Kaneti, Y. V.*; Oveisi, H.*; Suzuki, Yoshitaka; Tsuchiya, Kunihiko; Takai, Kimiko*; Sakae, Takeji*; Pradhan, S.*; Hossain, M. S. A.*; Fukumitsu, Nobuyoshi*; et al.

Bulletin of the Chemical Society of Japan, 91(2), p.195 - 200, 2018/02

 Times Cited Count:43 Percentile:82.02(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Mesoporous alumina as an effective adsorbent for molybdenum (Mo) toward Instant production of radioisotope for medical use

Saptiama, I.*; Kaneti, Y. V.*; Suzuki, Yumi*; Suzuki, Yoshitaka; Tsuchiya, Kunihiko; Sakae, Takeji*; Takai, Kimiko*; Fukumitsu, Nobuyoshi*; Alothman, Z. A.*; Hossain, M. S. A.*; et al.

Bulletin of the Chemical Society of Japan, 90(10), p.1174 - 1179, 2017/10

 Times Cited Count:44 Percentile:80.08(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Development of $$^{99}$$Mo/$$^{99m}$$Tc generator for the $$^{99}$$Mo/$$^{99m}$$Tc domestic production

Fukumitsu, Nobuyoshi*; Tsuchiya, Kunihiko; Ariga, Katsuhiko*; Yamauchi, Yusuke*

Isotope News, (742), p.20 - 24, 2016/02

no abstracts in English

Journal Articles

Emergent phenomena in perovskite-type manganites

Taguchi, Yasujiro*; Sakai, Hideaki*; Okuyama, Daisuke*; Ishiwata, Shintaro*; Fujioka, Jun*; Fukuda, Tatsuo; Hashizume, Daisuke*; Kagawa, Fumitaka*; Takahashi, Yoichiro*; Shimano, Ryo*; et al.

Physica B; Condensed Matter, 407(11), p.1685 - 1688, 2012/06

 Times Cited Count:5 Percentile:24.08(Physics, Condensed Matter)

Journal Articles

Calculated positions of point nodes in the gap structure of the borocarbide superconductor YNi$$_2$$B$$_2$$C

Nagai, Yuki*; Kato, Yusuke*; Hayashi, Nobuhiko; Yamauchi, Kunihiko*; Harima, Hisatomo*

Physical Review B, 76(21), p.214514_1 - 214514_8, 2007/12

 Times Cited Count:18 Percentile:60.76(Materials Science, Multidisciplinary)

To determine the superconducting gap function of YNi$$_2$$B$$_2$$C, we calculate the local density of states around a single vortex core with the use of Eilenberger theory and the band structure calculated by local density approximation, assuming various gap structures with point nodes at different positions. We also calculate the angular-dependent heat capacity in the vortex state on the basis of the Doppler-shift method. Comparing our results with the scanning tunneling microscopy and spectroscopy experiment, the angular-dependent heat capacity and thermal conductivity, we propose the gap structure of YNi$$_2$$B$$_2$$C, which has the point nodes and gap minima along $$langle110rangle$$. Our gap structure is consistent with all results of angular-resolved experiments.

Oral presentation

Consideration of molybdenum adsorption behavior of alumina by surface analysis

Suzuki, Yoshitaka; Niizeki, Tomotake*; Kitagawa, Tomoya*; Nishikata, Kaori; Matsukura, Minoru*; Hasegawa, Yoshio*; Tanase, Masakazu*; Fukumitsu, Nobuyoshi*; Yamauchi, Yusuke*; Ariga, Katsuhiko*; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of high performance Mo adsorbents

Fukumitsu, Nobuyoshi*; Yamauchi, Yusuke*; Saptiama, I.*; Ariga, Katsuhiko*; Hatano, Kentaro*; Kumada, Hiroaki*; Fujita, Yoshitaka; Tsuchiya, Kunihiko

no journal, , 

no abstracts in English

Oral presentation

Development of effective adsorbent for Molybdenum

Fukumitsu, Nobuyoshi*; Yamauchi, Yusuke*; Saptiama, I.*; Ariga, Katsuhiko*; Hatano, Kentaro*; Kumada, Hiroaki*; Fujita, Yoshitaka; Tsuchiya, Kunihiko

no journal, , 

no abstracts in English

Oral presentation

Development of mesoporous alumina-titanium complex aiming at domestic production of $$^{99}$$Mo/$$^{99m}$$Tc

Fukumitsu, Nobuyoshi*; Yamauchi, Yusuke*; Kaneti, Y. V.*; Benu, D. P.*; Saptiama, I.*; Ariga, Katsuhiko*; Hatano, Kentaro*; Kumada, Hiroaki*; Fujita, Yoshitaka; Tsuchiya, Kunihiko

no journal, , 

no abstracts in English

Oral presentation

Development of mesoporous alumina for domestic production of $$^{99}$$Mo/$$^{99m}$$Tc

Fukumitsu, Nobuyoshi*; Yamauchi, Yusuke*; Kaneti, Y. V.*; Benu, D. P.*; Saptiama, I.*; Ariga, Katsuhiko*; Hatano, Kentaro*; Kumada, Hiroaki*; Fujita, Yoshitaka; Tsuchiya, Kunihiko

no journal, , 

no abstracts in English

Oral presentation

Development of mesoporous alumina for domestic production of $$^{99}$$Mo/$$^{99m}$$Tc

Fukumitsu, Nobuyoshi*; Yamauchi, Yusuke*; Kaneti, Y. V.*; Benu, D. P.*; Saptiama, I.*; Ariga, Katsuhiko*; Hatano, Kentaro*; Kumada, Hiroaki*; Fujita, Yoshitaka; Tsuchiya, Kunihiko

no journal, , 

no abstracts in English

18 (Records 1-18 displayed on this page)
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