Positron beam studies of saponite film prepared by precipitation method

14th International Workshop on Slow Positron Beam Techniques & Applications

Numata, K.^1,2 ; Sato, K.^1 ; Fujimoto, K.^1 ; Ito, K.^3

Department of Environmental Sciences, Tokyo Gakugei University, 4-1-1 Nukuikita, Tokyo, Koganei

184-8501, Japan^1

Tokyo Electric Power Company (TEPCO), 16-46 Kashiwazaki, Niigata

945-0186, Japan^2

National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, Tsukuba

305-8565, Japan^3

关键词: Gravitational sedimentation;    Positron beams;    Positron lifetime spectroscopy;    Precipitation methods;    Relative intensity;    Saponite particles;    Slow positron beam;    Two-component;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/791/1/012024/pdf
DOI  :  10.1088/1742-6596/791/1/012024

来源: IOP

【 摘 要 】

Micrometer-sized saponite particles were isolated by means of gravitational sedimentation method applying Stokes' law. The sample prepared with this method was film-like state with a thickness of ∼ 30 μm and was semitransparent, indicating that the particles are homogeneously stacked all together. Positron lifetime spectroscopy using a slow positron beam yielded two components for ortho-positronium with lifetimes of 1.5 ns and 8.4 ns with the respective relative intensities of 13 % and 10 %. The results suggest that the self-assembly of the larger particles toward structural densification is suppressed for the present film in comparison with the smaller nanoparticles.