学　术

　　由基础与前沿研究院主办的基础论坛第188期邀请芬兰阿尔托大学Robin H. A. Ras教授来校作学术交流。具体安排如下，欢迎师生们参加。

　　题　目：The challenge of accurate characterization of surface wetting

　　主讲人：Prof. Robin H. A. Ras

　　时　间：2019年9月27日（周五）10:00-11:00

　　地　点：通信楼818会议室

　　报告摘要：

　　Wetting is typically characterized from a sessile droplet by evaluating the angle at the contact line where liquid, air and solid meet. Contact angle goniometry is considered as the gold standard of wetting characterization, however, is prone to inaccuracies, especially towards high contact angles.

　　In this talk, I will describe the problem and present state-of-the-art methodologies for evaluating wetting of hydrophobic surfaces with enhanced accuracy. Oscillations of magnetic water droplets allow measurement of friction forces between droplet and surface with nanonewton sensitivity. Adhesion forces between droplet and surface can be measured by scanning droplet adhesion microscopy with sensitivity down to nanonewton.

　　Scanning droplet adhesion microscopy allows to obtain wetting maps, a new concept for hydrophobic surface characterization, visualizing wettability variations with micronscale spatial resolution.

　　个人简介：

　　Robin Ras is head of the Soft Matter and Wetting research group at Department of Applied Physics, Aalto University (Finland). His research area is situated at the interface between physics, chemistry and materials science, dealing with fundamental scientific problems and technological applications. He has authored over 120 scientific publications, including several in journals from the Science and Nature family. In 2016, Robin Ras received the ERC Consolidator grant for research on extremely water-repellent surfaces. He received the Anton Paar Research Award for Instrumental Analytics & Characterization (2018) for the invention Scanning Droplet Adhesion Microscopy.

　　　　　　　　　　　　　　　　　　　　　　基础与前沿研究院

　　　　　　　　　　　　　　　　　　　　　　　2019年9月25日