Monitoring the Crystallization Stages of Silicalite by Positron Lifetime Spectroscopy

摘要：

In porous media, positron annihilation techniques (PAT) revealed the existence of annihilation modi with long lifetimes connected to structural and extrastructural free volumes acting as trapping centres for o-Ps. Our aim in this work was to study the influence of the synthesis applied for the production of the zeolite framework and the correlation between the trapping pattern and crystallization progress. PAT lifetime (LT) measurements were performed in silicalite-1 samples in various stages of crystallization and a large change was observed in the long components. The results are discussed in connection to the crystallization and the availability of free volume.

关键词： zeolites free volume positronium formation crystallization gel ageing

作者: Zs.Kajcsos A.T.Luu N.D.Thanh C.Kosanovic S.Bosnar B.Subotic P.Major L.Liszkay D.Bosnar K.Lázár H.Havancsák

作者单位: KFKI Res.Inst.for Part.Nucl.Physics,H-1525 Budapest 114,P.O.B.49,Hungary Center for Nuclear Techniques-Vietnam Atomic Energy Commission,217 Nguyen Trai,D.1,Hochiminh City,Vi Div.of Mater.Chem.,Ruder Boskovic Inst.,Bijenicka 54,POB 180,Zagreb,Croatia Dept.of Physics,University of Zagreb,Bijenicka 32,Zagreb,Croatia Inst.of Isotopes of HAS,H-1525 Budapest,P.O.B.77,Hungary Dept.of Materials Physics,Eotvos Univ.,Pázmány P.1A,H-1117 Budapest,Hungary

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: 173-176

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）