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알림마당

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> 알림마당 > 정기세미나

정기세미나

 
Exploiting Soft matter at Interfaces for Functional Materials Production
일자 2017.09.25(월)17:00~ 연사 이효민 교수 소속 POSTECH 화학공학과
The performance of functional materials is governed by their ability to interact with the surrounding environment in a well-defined and controllable manner. Recent advances in various experimental techniques enables manipulation of  the structure and the properties of soft materials with exquisite precision, providing the means to create composite materials where the surface and the bulk of the material can be independently engineered and controlled. This opens the door in the design and fabrication of novel functional materials. In this talk, I will begin with a brief summary of the work I’ve done previously on polymer thin films and their characterization. A focus will be on how we utilize the ability to separately tune the surface and bulk properties of a nanostructured polymer thin film. A new physical concept, “zwitter-wettability”, whereby the film readily absorbs water vapor while simultaneously exhibiting hydrophobic character to liquid water is described and exploited to design zwitter-wettable films with significantly enhanced antifog and even frost-resistant behavior. In the second part of this talk, I will show how we utilize the precise flow control of multi-phasic fluids in droplet-based microfluidics to prepare novel functional materials that otherwise would have been inaccessible. For instance, we produced triple emulsion drops with an ultra-thin intermediate layer consisting of either hydrogel or fluorocarbon oil to successfully encapsulate a broad range of cargo materials with high loading efficiency. These emulsion drops have been demonstrated to exhibit interesting properties and great technological potential for encapsulation and controlled release of challenging and important active materials such as volatile small molecules and proteins in emulsion-templated microcapsules.