報告題目：Multiscale Architectured Polymeric Membranes with Tunable Separation Properties
報 告 人 ：Prof. Pil Jin Yoo
報告時間：2018年2月28日（周三）上午10:00
報告地點：化學(xué)樓一號會議室
邀 請 人：朱錦濤教授
報告人簡介：
Pil Jin Yoo, 韓國成均館大學(xué)教授，于2003年在韓國首爾國立大學(xué)獲得博士學(xué)位，博士畢業(yè)后在MIT從事博士后研究，2007年起，任韓國成均館大學(xué)教授。研究方向主要為Multiscale Structuring, Thin Film Instabilities, Hybrids等。
報告摘要：
Membrane has been used from time immemorial to purify water. Advances made in membrane technology for more than a century have to do with either enhancing separation efficiency of the membrane or improving the permeation flux. Enhancing the separation efficiency, however, inevitably led to reducing the permeation flux, and improving the permeation flux resulted in a loss in the separation efficiency. This inherently built-in dilemma has to be dislodged for the filtration membrane to fully reach its potential. In this presentation, we suggest multiscale porous membranes that allow for high permeation flux without sacrificing separation efficiency. In order to create the multiscale architectured membranes, primary structure is first prepared by assembling closely packed colloidal particles, filling the gaps with a suitable material, and dissolving out the particles to form inverse opal structure. Then, secondary nanostructures are incorporated inside the structured template to elaborately tune the pore size, tortuosity, and interfacial properties. Embedded nanostructures can be created by layer-by-layer assembly of polyelectrolyte multilayers, microphase separation of block copolymers, or self-assembly of another colloidal particles, etc. Finally, the constructed multiscale architectures are utilized for water-treatment applications, such as ultrafiltration of nanoparticles or nanofiltration of metallic ions. Due to the perfectly ordered characteristics of the multiscale architecture, it offers advantages of reduced tortuosity as well as pore size uniformity, resulting in high permeability and selectivity simultaneously.
