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Multiscale strategy for nanoarchitectured polymeric membranes toward tunable separation properties
유필진 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
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 materials, and dissolving out the particles to form inverse opal structure. Then, secondary nanostructures are incorporated inside the structured template to eleaborately tune the pore size, tortuosity, and interfacial properties. Embedded nanostructures can be created by layer-by-layer assembly of another coloidal particles, etc. Finally, the constrcuted multiscale architectures are utilized for water-treatment applications. 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 simultanesouly.
Multiscale architectured polymeric membranes with tunable separation properties
유필진 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
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.
유필진,이상훈,박미경,권석준,강혜원,이홍희 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.1
본 총설에서는 나노 형상 및 나노 구조체의 제작에 있어서 기존의 노광 공정을 이용하는 대신, 물리적 접촉법을 통해서 형상을 구현하는 비전통적 패터닝 방법을 소개하였다. 이에 기존 노광 공정의 비용 및 기술적 문제를 극복하는 대안으로써 나노 각인 리소그라피법과 연성 리소그라피법을 제시하였다. 이들 공정은 주형을 이용하여 반복적으로 형상을 구현함으로써 경제적인 공정을 구현하면서도, 곡면상에의 형상 구현까지도 가능한 기술적 장점을 가지고 있다. 더 나아가, 이들 공정의 단점을 보완함과 동시에 산업적 이용가치를 높인 공정으로써 상은 각인 리소그라피법 및 연성 성형법을 제시하였다. 이를 통해 간단한 공정만으로도 복잡한 구조나 3차원 구조의 나노 형상을 자유로이 제조할 수 있었다. This review is on unconventional nanolithographies that can replace the conventional photolithography. All these technique untilize a pattern mold and the patterning is realized by physical contact of the mold with the underlying polymer layer. They are cost-effective, applicable to small feature sizes that cannot be defined by photolihography, and to an extent applicable to non-planar surfaces. Imprint and soft lithographies are reviewed first, which is then followed by new lithographies of room-temperature imprint lithography, capillary force lithography and soft molding. These new techniques are also efficient and cost-effective in fabricating complex or three-dimensional patterns and structurees.
Multiscale Architectured Inverse-Opal Structured Membranes for Environmental/Energy Applications
유필진 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Advances made in membrane technology 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. Here, we suggest multiscale porous membranes that allow for high permeation flux without sacrificing separation efficiency. For creating the multiscale architectured membranes, primary structure is first prepared by assembling colloidal particles, filling the gaps to form inverse opal structure. Then, secondary nanostructures are incorporated inside the structured template to elaborately tune the pore size, tortuosity, and interfacial properties. Finally, the constructed multiscale architectures are utilized for water-treatment and energy-generation applications, such as ultrafiltration, nanofiltration or separators for Li-ion batteries.