题目：Understanding
& manipulating of coalescence in emulsions
时间：2015.10.27（周二）上午10:30
地点：光电工程学院342会议室
报告人：冯欢欢博士，Wageningen
University, The Netherlands
主持人：彭争春教授
Abstract
In
this lecture I will present our work on coalescence in oil/water emulsions. We
observed two distinct modes of coalescence in a drying emulsion: one that
proceeds as a nucleation and growth process throughout the sample and another
where a coalescence front propagates into the sample from the dry end. Which
mode dominates is determined by a balance between the established pressure
profile and the local critical disjoining pressure in the emulsion. The
universality of this mechanism is also confirmed in case of thermal responsive
emulsions. In the light of advance in emulsion coalescence and optical
engineering, we first show that combining synchronized high-speed imaging with
microfluidic centrifugation allows the direct measurement of the thermodynamic
stability of emulsions, as expressed by the critical disjoining pressure. The
same method, combined with quantitative image analysis, also gives access to
droplet-scale details of the coalescence process.
报告人简介：
冯欢欢，目前在荷兰瓦格宁根大学物理化学软物质研究院做博士后。本科毕业于北京师范大学化学学院，而后进一步深造取得了高分子物理化学硕士学位，之后赴荷兰瓦格宁根大学攻读博士学位，在乳液相转化领域取得了广受认可和好评的进展，所以继续受聘为博士后研究纳米颗粒、微流体和发光材料。本人研究兴趣是微流控芯片（Micro fluidic chips）的新型制备及应用特别是其在生物体中的作为传感器或者微型化检测（labchip）的应用。
