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Oral presentation

Structural analysis of Cs adsorption on Cs-montmorillonite using ab initio calculation and $$^{133}$$Cs solid state NMR, 2; $$^{133}$$Cs MAS and 3Q MAS NMR

Okamoto, Takuya*; Okubo, Takahiro*; Iwadate, Yasuhiko*; Deguchi, Kenzo*; Shimizu, Tadashi*; Oki, Shinobu*; Tachi, Yukio

no journal, , 

The structures of Cs adsorption on montmorillonite were investigated by the nuclear magnetic resonance (NMR) spectroscopy. The NMR spectra of Cs adsorbed montmorillonite samples with different Cs contents were collected by $$^{133}$$Cs Magic Angle Spinning (MAS) NMR and $$^{133}$$Cs Triple Quantum (3Q) MAS NMR. The adsorbed Cs structures were evaluated based on the correlations between the structural characteristics and the values of the NMR parameters predicted by the first principal calculations.

Oral presentation

Structure of hydrated Cs on montmorillonite

Okamoto, Takuya*; Okubo, Takahiro*; Iwadate, Yasuhiko*; Deguchi, Kenzo*; Shimizu, Tadashi*; Oki, Shinobu*; Tachi, Yukio

no journal, , 

The structures of Cs adsorbed on montmorillonite were investigated by $$^{133}$$Cs Magic Angle Spinning (MAS) NMR spectroscopy. The NMR spectra of Cs adsorbed on montmorillonite samples were measured under different relative humidity levels and were analyzed to evaluate the change in the structure of hydrated Cs sorbed on montmorillonite.

Oral presentation

Relationships between chemical shift and structure of Cs absorbed on clay mineral

Takei, Koyo*; Okubo, Takahiro*; Tachi, Yukio; Fukatsu, Yuta

no journal, , 

Cs adsorption sites on vermiculite clays were investigated by $$^{133}$$Cs magic-angle-spinning nuclear magnetic resonance (MAS NMR) and theoretical $$^{133}$$Cs chemical shift calculations. A partially Cs exchanged vermiculite sample was prepared. Three peaks on $$^{133}$$Cs MAS NMR spectra were experimentally observed. However, Cs absorption sites were not assigned to these peaks. A molecular model of fully Cs exchanged vermiculite was built to obtain $$^{133}$$Cs chemical shift theoretically by GIPAW method. Calculated $$^{133}$$Cs chemical shift ranged 23 to 47 ppm, which corresponds to the peak of the lowest field side. Detailed relationships between structure and $$^{133}$$Cs chemical shifts were investigated from Cs position and vermiculite layer structure.

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