Positron beam studies of saponite film prepared by precipitation method
Positron beam studies of saponite film prepared by precipitation method
复制标题
沉淀法制备皂石膜的正电子束研究
DOI：
10.1088/1742-6596/791/1/012024
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Ito K
中科院分区：
文献类型：
--
作者：
Numata K;Sato K;Fujimoto K;Ito K
应用斯托克斯定律，通过重力沉降法分离微米级皂石颗粒。用该方法制备的样品呈薄膜状，厚度约为30 μm，呈半透明状，表明颗粒均匀堆积在一起。正电子寿命谱，使用慢正电子束产生两个组件的正电子偶素的寿命为1.5 ns和8.4 ns的相对强度分别为13%和10%。结果表明，与较小的纳米颗粒相比，本发明的膜抑制了较大颗粒朝向结构致密化的自组装。
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.