Author
Masataka Moriyasu
Bio: Masataka Moriyasu is an academic researcher from Osaka University. The author has contributed to research in topics: Uranyl & Luminescence. The author has an hindex of 5, co-authored 5 publications receiving 209 citations.
Topics: Uranyl, Luminescence, Quenching (fluorescence), Electron transfer, Ion
Papers
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TL;DR: In this paper, the quenching of uranyl luminescence by water molecules was satisfactorily interpreted by an electron transfer mechanism in terms of oxidation-reduction potentials of the uranyl ion and water molecule.
55 citations
TL;DR: In this paper, the luminescence lifetimes of uranyl aquo ion, 1:1 and 1:2 uranyl fluoro complexes were determined to be 2.4, 75 and 150 μs, respectively (25°C, 0.1 M HClO 4, μ = 1).
51 citations
TL;DR: In this paper, the rate constants in quenching reaction of uranyl luminescence by halide ions were determined from luminecence lifetime measurement, showing that an electron transfer process plays an important role in the quench of halide ion.
50 citations
TL;DR: In this article, the quenching reaction of uranyl luminescence by metal ions in a lower valence state such as Fe 2+, Tl + and Ce 3+ is diffusion-controlled and the dominant process of the reaction is concluded to be an electron transfer from quenchers to uranyl ion.
45 citations
TL;DR: In this paper, the reaction mechanism of the uranyl photoreduction and the inhibiting action has been investigated in correlation with quenching of uranyl fluorescence in lactic acid solution.
11 citations
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276 citations
TL;DR: In this paper, Extended X-ray absorption fine structure (EXAFS) spectroscopy has been used to investigate the adsorption of uranyl (UO22+) onto Wyoming montmorillonite.
261 citations
178 citations
TL;DR: In this paper, a series of natural uranium-silicate minerals including boltwoodite, uranophane, soddyite, kasolite, sklodowskite, cuprosklodowskiy, haiweeite, and weeksite were recorded for time-resolved U(VI) laser fluorescence spectra (TRLFS).
152 citations
TL;DR: In this paper, the authors used time-resolved laser-induced fluorescence for direct uranium speciation at low level in the framework of environmental studies, by varying pH and uranium concentration in the absence of carbonate ions and at fixed ionic strength.
Abstract: Time-resolved laser-induced fluorescence is a unique method for direct uranium speciation at low level in the framework of environmental studies. By varying pH and uranium concentration in the absence of carbonate ions and at fixed ionic strength, it was possible, together with free uranyl UO2 2+, to identify spectrally and temporally all the uranium-hydroxo complexes, namely, UO2 OH+, UO2 (OH)2 , UO2 (OH)3-, (UO2)2(OH)2 2+, (UO2)3(OH)5+, and (UO2)3(OH)7-.
144 citations