Porous structure of mesoporous silica studied by positron annihilation lifetime spectroscopy

摘要：

Positron annihilation lifetime spectroscopy (PALS) is accepted widely as a highly sensitive and nondestructive technique for mesoporous materials. In this paper, a series of mesoporous silica particles with different pore diameters were fabricated using tetraethyl orthosilicate (TEOS) as the network precursor and hexadecyl trimethyl ammonium bromide (CTAB) as a structure-directing agent. The porous structure was measured by PALS. Different positron lifetime spectra for the various samples indicated the diverse pore diameters, which were confirmed by field emission transmission electron microscopy (FE-TEM) and small angle X-ray diffraction (SAXRD). A very long-lived component in o-Ps lifetime spectrum can be ascribed to O-Ps in porous of silica particles.

作者: Yang Xi Weichang Hao Danni Wang Tianmin Wang Runsheng Yu Baoyi Wang Long Wei

作者单位: Center of Materials Physics and Chemistry,Beihang University,Beijing 100083,PR China Laboratory of Nuclear Analytical Techniques,Institute of High Energy Physics,Beijing 100039,P.R.Chin

会议类型: 国际会议

会议名称: 第九届国际正电子与正电子素国际会议(9th International Workshop on Positron and Positronium Chemistry)(PPC–9)

会议地点: 武汉

会议语种:英文

页码: 118

在线出版日期: 2008-05-11（万方平台首次上网日期，不代表论文的发表时间）