学术报告（11月20日 周二 上午10:00-12:00）

 主持人：马杰 教授

欢迎广大师生前来参与！

【摘要】

Structuring in polymer and polyelectrolyte films can be induced and controlled by modifying solution conditions or annealing procedures. These phenomena are of interest for controlling adhesion, friction, and lubrication of surfaces in biomedical applications. For example, coatings with different surface roughness and types of patterning can be created by allowing copolymers to phase separate into structures with different morphologies, and certain types of copolymers form shear-induced structures. Changes in the solvent quality and the presence of multivalent ions in polyelectrolyte systems cause aggregation and strongly influence the normal and frictional forces between interacting layers. Some of these changes can be reversible upon changing the solution conditions and enable evaluation of the contributions to aggregation from solvent quality and electrostatic bridging of polyelectrolytes. To illustrate these phenomena, examples will be shown of structure formation observed with atomic force microscopy (AFM) and its effects on normal and friction forces as studied with the surface forces apparatus (SFA)

【报告人简介】

Prof. Marina Carola Ruths is a physical chemist from University of Massachusetts Lowell, USA, working in areas very close to physics. Her major research interest is to explore surface and colloid physics and chemistry, including interfacial forces, nanotribology and surface texturing using AFM and some other techniques. She is also interested in rheology of complex fluids in confinement and some issues related to polymer brushes. She has published many papers with one recent co-author work on Science.