Surface Confinement as a Strategy to Control Phase Transition: from Polymer Micelles to Gas Nanobubbles

讲座名称: Surface Confinement as a Strategy to Control Phase Transition: from Polymer Micelles to Gas Nanobubbles
讲座时间 2016-04-14
讲座地点 化学楼207室
讲座人 陈前进
讲座内容
报告题目: Surface Confinement as a Strategy to Control Phase Transition: from Polymer Micelles to Gas Nanobubbles

报告时间:2016年4月14日(星期四)上午10:00-11:00

报告地点:化学楼207室

报告人:美国犹他大学化学系陈前进博士

报告内容简介:In a physically confined environment, structure frustration, confinement- induced entropy loss, and surface interactions can strongly influence the molecular organization and consequently may change the phase transition behavior. In this talk, I am going to give two examples of such confinement induced phase transition. The first part of my talk will discuss an interesting spherical-to-cylindrical transition of block copolymer micelles induced by the nanopore confinement. Long polymeric nanowires with several micrometer can be obtained simply from extruding spherical micelles through nanopores. Some basic physical understanding as well as applications of such a confinement induced transition will be covered. The second part of my talk will focus on studies of single gas nanobubble, which is confined at nanosized surface. By minimizing the electrode size down to nm and rapid electrochemical generation of gas molecules at the electrode surface, we are able to electrochemically nucleate a single gas nanobubble. Based on such single nanobubble investigation, the physics and chemistry of bubble are studied in a very different way with many valuable insights into phase nucleation reaction.

讲座人介绍
报告人简介: 陈前进博士,本科毕业于四川大学高分子科学与工程学院,2008年前往香港中文大学师从吴奇院士课题组攻读博士学位,期间从事高分子化学与物理以及光散射技术的研究。2013年博士毕业后前往美国犹他大学化学系Henry White教授课题组做博士后研究,主要利用纳米电化学和扫描电化学显微镜等手段研究发生在界面上电化学和物理化学现象。迄今已在包括JACS, ACS nano, J. Phys. Chem. Lett., Macromolecules等国际主流期刊上发表SCI收录论文19篇(其中第一作者9 篇)。

代表性论文:

  1. Chen, Q. J.; Wiedenroth, H. S.; German, S. R.; White, H. S.* Electrochemical Nucleation of Stable N2 Nanobubbles at Pt Nanoelectrodes.  J. Am. Chem. Soc., 2015, 137,12064-12069.
  2. Chen, Q. J.; Zhao, H.; Ming, T.; Wang, J. F.*; Wu, C.* Nanopore Extrusion-Induced Transition from Spherical to Cylindrical Block Copolymer Micelles. J. Am. Chem. Soc., 2009, 131, 16650-16651.
  3. Chen, Q. J.; Luo, L.; Faraji, H.; Feldberg, S. W.; White, H. S.* Electrochemical Measurements of H2 Nanobubble Nucleation and Stability at Pt Nanoelectrodes. J. Phys. Chem. Lett., 2014, 5, 3539-3544.
  4. Chen, Q. J.*; Li, Y. *; Wu, C. How Long Cylindrical Micelles Formed after Extruding Block Copolymer in a Selective Solvent through a Small Pore Fragment back into Spherical Ones, Macromolecules, 2013, 46, 9164-9167
讲座视频 暂无视频

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