学术报告：Interfacial pinning, hysteresis and dynamics near a moving contact line
题目：Interfacial pinning, hysteresis and dynamics near a moving contact line报告：Prof. Penger Tong（Department of Physics, Hong Kong University of Science and Technology）
时间：2012年6月 15日（星期五）上午9：30
地点：嘉定园区学术活动中心307
报告简介：
The study of the dynamics near a moving contact line between a liquid interface and a solid surface is of fundamental interest for our general understanding of a common class of problems involving viscoelastic dynamics in random force fields, such as frictions between solid surfaces and motions of ferromagnetic domain walls and vortices in type-II superconductors; and it also has immense practical applications in tertiary oil recovery, drag reduction, advanced materials and microfluidics. In this talk I will present our recent experimental efforts in developing an atomic force microscope (AFM) based hanging fiber probe for the study of interfacial dynamics. With this new AFM technique, a long vertical glass fiber of a few microns in diameter, with one end glued onto an AFM cantilever and the other end in contact with a liquid-air interface, is used as a force sensor to measure the viscous drag of a moving contact line and the capillary forces on the thin fiber. Applications of this technique to the study of interfacial microrheology and contact line dynamics will be discussed. Work supported by the Research Grants Council of Hong Kong SAR.
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