Study on cation-cation interaction of neptunium in concentrated aqueous solutions

• Project/Area Number: 26420869
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nuclear engineering
• Research Institution: Osaka University (2016); Kyoto University (2014-2015)
• Principal Investigator: FUJII TOSHIYUKI 大阪大学, 工学研究科, 教授 (10314296)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: ネプツニウム / ラマン分光分析法 / ウラン / カチオン / 分子振動 / イルイオン / ラマン分光分析

Outline of Final Research Achievements

Coordination circumstance of neptunyl ion in concentrated alkali and alkaline earth chloride solutions was analyzed by Raman spectrometry. The symmetric stretch mode of neptunyl (V) and (VI) , and the asymmetric stretch mode of neptunyl (V) were found. The high Raman intensity of the asymmetric stretch mode indicates a definite cation-cation interaction between neptunyl (V) and solvent cations. It was found that the solvent alkali and alkaline earth cations having larger polarizing power strongly contact with O of neptunyl.

Research Products

• [Journal Article] Theoretical and Experimental Study of the Vibrational Frequencies of UO22+ and NpO22+ in Highly Concentrated Chloride Solutions (2015)
  • Author(s): Toshiyuki FUJII, Akihiro UEHARA, Yoshihiro KITATSUJI, and Hajimu YAMANA
  • Journal Title: J. Radioanal. Nucl. Chem. Volume: 303 Issue: 1 Pages: 1015-1020
  • DOI: 10.1007/s10967-014-3340-6
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 濃厚塩化物溶液中における５価ネプツニウムの陽イオン-陽イオン相互作用 (2016)
  • Author(s): 藤井俊行, 上原章寛, 芝原雄司
  • Organizer: 日本原子力学会2016年秋の大会
  • Place of Presentation: 久留米シティプラザ
  • Year and Date: 2016-09-06
• [Presentation] 電解質溶液中に溶存するアクチノイド及びランタノイド錯体の分光分析 (2016)
  • Author(s): 藤井俊行, 上原章寛
  • Organizer: 第75回マテリアルズ・テーラリング研究会
  • Place of Presentation: 京都大学芝蘭会館
  • Invited
• [Presentation] 京都大学原子炉実験所ホットラボラトリを利用したアクチニド物理化学研究 (2015)
  • Author(s): 藤井俊行, 上原章寛, 芝原雄司, 高宮幸一, 笠松良崇, 飯塚政利
  • Organizer: 日本アクチノイドネットワークJ-ACTINET勉強会
  • Place of Presentation: 大阪大学工学部Ａ１棟（大阪府・吹田市）
  • Year and Date: 2015-05-28