Spectroscopic analysis of spatiotemporal evolutions of Liesegang bands by time-resolved X-ray fluorescence imaging

2016 Fiscal Year Final Research Report

• Project/Area Number: 26410163
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Analytical chemistry
• Research Institution: Japan Women's University
• Principal Investigator: Hisashi Hayashi 日本女子大学, 理学部, 教授 (60250833)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: リーゼガングバンド / プルシアンブルー類似体 / 時間分解・蛍光X線測定 / 位置分解XANES

Outline of Final Research Achievements

We have developed a laboratory-use X-ray fluorescence (XRF) spectrometer for studying the evolution of Liesegang bands in gels. The developed spectrometer has two types of operation mode: high-resolution mode and high-sensitivity mode. By using this spectrometer, we measured time-dependences of Mn/Fe/Co distributions of several aggregate patterns (including Liesegang bands) formed in water-glass gels, which were generated by reaction-diffusion processes of Mn2+/Fe3+/Co2+ and [Fe(CN)6]3-/[Fe(CN)6]4- ions.　The obtained XRF results demonstrated that the turbid zones in gels mainly contained diffusive Prussian blue analogues (PBAs), and indicated that their metal distributions strongly depend on the preparation conditions. Additional XANES measurements of fully developed samples suggests that the combination of time-resolved XRF and position-dependent XANES is a powerful tool for analyzing the aggregate patterns stemming from the formation of PBAs.

Free Research Field

化学