A new threshold of uncovering the nature of glass transition:The slow β relaxation in glassy states  

作　　者：HU LiNa ZHANG ChunZhi YUE YuanZheng BIAN XiuFang 

机构地区：[1]Key Laboratory of Liquid Structure and Heredity of Materials (Ministry of Education), Shandong University, Jinan 250061, China [2]Section of Chemistry, Aalborg University, Denmark-9000, Denmark

出　　处：《Chinese Science Bulletin》2010年第6期457-472,共16页

基　　金：supported by the National Natural Science Foundation of China (Grant No.50801041);National Basic Research Program of China (Grant No.2007CB613901);Research Fund for the Doctoral Program of Higher Education of China (Grant No.200804221041)

摘　　要：The glass transition involves more than one dynamic relaxation mechanisms in supercooled liquids,such as α relaxation,slow β relaxation and fast β relaxation and so on.For the traditional theoretical system,α relaxation is believed mainly responsible for the nature of the glass transition as the beginning of the phenomenon.This idea,however,has been open to a big challenge since recent studies have indicated that slow β relaxation closely relates to α relaxation.Slow β relaxation determines the characteristics of α relaxation and is the precursor and the more microscopic base of glass transition behavior.In order to illuminate the significance of slow β relaxation in the fields of the glass transition and the structure of supercooled liquids,the accomplished progress is summarized from different aspects such as on the correlation between α relaxation and slow β relaxation,on the manner of α-slow β relaxation merging,on the energy landscape,on the excess wing and on the thermodynamically phenomenological models.The tendency of investigation in slow β relaxation is also evaluated.The glass transition involves more than one dynamic relaxation mechanisms in supercooled liquids, such as α relaxation, slow β relaxation and fast β relaxation and so on. For the traditional theoretical system, α relaxation is believed mainly responsible for the nature of the glass transition as the beginning of the phenomenon. This idea, however, has been open to a big challenge since recent studies have indicated that slow β relaxation closely relates to α relaxation. Slow β relaxation determines the characteristics of α relaxation and is the precursor and the more microscopic base of glass transition behavior. In order to illuminate the significance of slow β relaxation in the fields of the glass transition and the structure of supercooled liquids, the accomplished progress is summarized from different aspects such as on the correlation between α relaxation and slow β relaxation, on the manner of α-slow β relaxation merging, on the energy landscape, on the excess wing and on the thermodynamically phenomenological models. The tendency of investigation in slow β relaxation is also evaluated.

关 键 词：玻璃化转变 动力松弛 性质 门槛 作者 过冷液体 液体结构 热力学 

分 类 号：TG386.3[金属学及工艺—金属压力加工] TS201.7[轻工技术与工程—食品科学]