时  间：   2013年4月18日（星期四）下午4:10
地  点：   中心教学楼610
报告一：博士生报告 时间：16:10-16:40
题  目： Distinct kinetics of fiber growth, branching and bundling of soft materials
报告人：    刘宇
摘要：
The macroscopic properties particularly the rheological properties of a supramolecular gel are governed by the fiber growth, branching and bundling of the fiber network. Understanding the role of kinetics of the fiber growth, branching and bundling in fiber network microstructure formation is of considerable importance in engineering gel materials to achieve their optimized performances/functionalities. In this work, the distinguishable kinetic feature of fiber growth, branching and bundling in the gelation process was revealed by kinetic analysis of dynamic rheological data in terms of the Avrami model. We extract the kinetic parameter, i.e. the Avrami exponent, of a fibrous gel from the dynamic rheological measurement of the gelation process, and to establish the kinetics-structure correlation suitable for two growth modes. We believe that such a kinetics-structure correlation analysis may provide a quantitative understanding of the role of kinetic control in engineering the microstructure of the fiber network in gel functional materials.

报告二：硕士生报告 时间：16:40-17:10
题  目：过渡金属掺杂ZnSe的制备及光学性质的研究
报告人：    郭鹏飞
摘要：
    硒化锌作为一种典型的宽禁带的二六族半导体材料,在室温下其禁带宽度为2.7eV，硒化锌具有良好的光学性能，因此在二极管、紫外发射器件和光电探测器等方面具有广泛的应用。采用化学气相沉积的方法快速且简便的生长出结晶质量高的掺杂过渡金属元素的纳米线，例如Mn、Fe，并对该纳米线进行光致发光、拉曼光谱、SEM、EDS的测试，研究过渡金属掺杂后晶体场对能带结构的影响。

联系方式：新葡萄88805官网办公室（68913163）
更多信息请关注新葡萄88805官网网站physics.bit.edu.cn