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신하민,지원석,배선영,김종학,김진수 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
The development of high-performance membranes is of pivotal importance for practical gas separations. However, it is challenging to prepare defect-free thin membranes. In this study, high-performance composite membranes were prepared based on a thin mixed matrix membrane (MMM) selective layer composed of a poly(vinyl chloride)-poly(oxyethylene methacrylate) (PVC-POEM) graft copolymer and ZIF-8 nanoparticles on a macroporous alumina support, via a spin coating technique. The high CO2 affinity of PVC-POEM with its amphiphilic microphase-separated structure, and the high gas diffusivity of ZIF-8 with its unique porosity and large surface area, enabled the membrane to facilitate gas separation effectively, leading to high permeance and selectivity.
ZnO층의 전환반응을 통한 Propane/Propylene 기체 분리용 ZIF-8 분리막 합성
이정희,신하민,김동휘,유성종,김진수 한국막학회 2017 한국막학회 총회 및 학술발표회 Vol.2017 No.05
As ZIF materials have their unique properties such as high surface area, tunable pore structure, thermal and chemical stability, they can be used in various applications including gas separation and catalysis. For synthesis of ZIF membranes, fixing sub-micron ZIF seed particles on the support is challenging and important. In this work, ZIF-8 seed layer was synthesized by conversion synthesis of ZnO layer on support in H-mIm solution, followed by the secondary growth synthesis of ZIF-8 membranes. The parameters of conversion seeding had been investigated to control the reaction rate combining the dissolution rate of ZnO and the crystallization rate of ZIF-8. This ZIF-8 membranes showed the better coverage of seeding layer and gas separation properties compared with the membranes prepared by traditional dip-coating seeding.
이정희,김동휘,신하민,유성종,권혁택,김진수 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
Supported ZIF-8films with varying microstructures are prepared by ZnO to ZIF-8 conversion reaction in a2-methylimidazole ligand solution. The grain size and continuity of thefilms are controlled bymanipulating two critical conversion parameters such as solvents and their blends, and temperature. TheZIF-8films with varying microstructures are used as seed layers to synthesize propylene-selective ZIF-8membranes. The propylene/propane separation performances are greatly affected by the seed layermicrostructures. Non-continuous seed layers with compactly packed ZIF-8 nanocrystals tend to yieldmore propylene-selective membranes than those grown from continuous seed layers with larger grainsize likely due to improved grain boundary structure. Furthermore, the membranes are mechanicallystronger than those grown from conventional seed layers, which are obtained by dip-coating ZIF-8nanocrystals on substrates, possibly owing to the presence of mechanical interlocks between themembranes and porous substrate network.
ZnO 전환을 이용한 ZIF-8 분리막 합성 및 기체투과 특성
김진수,이정희,신하민 한국막학회 2016 한국막학회 총회 및 학술발표회 Vol.2016 No.05
MOF(Metal-organic frameworks)의 일종인 ZIF-8은 큰비표면적과 높은 열적⋅ 화학적 안정성을 가지고 있어 분리막 재료로 많은 연구가 진행되고 있다. 특히, 3.4Å 크기의 기공입구와 11.6 Å 크기의 기공 크기를 가지고 있는 ZIF-8을 분리 막으로 합성시 프로필렌/프로판을 분자체 효과를 통해 분리해 낼 수 있다. 본 연구에서는 ZnO 층을 형성하고 이를 전환시켜 결함 없는 ZIF-8 막을 합성하고 이를 통해 프로필렌/프로판을 분리하고자 했다. 우선, 매크로기공을 가진 디스크 모양의 α-알루미나 지지체 위에 ZnO 층을 형성하고, 2-methylimidazole 용액에서 용매열 합성하여 ZnO를 ZIF-8 분리막으로 전환시켰다. 합성된 ZIF-8 분리막 은 XRD, SEM, 기체투과장치, GC 등을 이용하여 분석하였다.