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Direct spraying approach for synthesis of ZIF-7 membranes by electrospray deposition
Aceituno Melgar, Ví,ctor Manuel,Kwon, Hyuk Taek,Kim, Jinsoo Elsevier 2014 Journal of membrane science Vol.459 No.-
<P>Zeolitic imidazolate frameworks (ZIFs) are promising materials for advanced membrane applications clue to their desirable properties, which enable them to recognize specific target molecules based on the molecular sieving mechanism and/or adsorption affinity. However, their large scale commercial applications still remain a challenge because of the absence of a synthesis method that offers reproducibility, scalability, and cost-effectiveness. To this end, here we report our work of synthesizing supported zeolitic imidazolate framework ZIF-7 films and membranes in a facile and time-efficient manner at ambient pressure using a simple electrospray deposition technique. A governing parameter which dominantly affected the microstructures and crystal integrity of the membranes was deposition temperature while precursor flow rate and applied voltage to the precursor solution were important variables to obtain a stable spraying mode which is essential to have a uniform coating. Our method, which is an electrostatic force-assisted coating approach, has the following attractive advantages over conventional synthetic routes such as in situ and secondary growth methods: (1) dramatic reduction in synthesis time and precursor consumption, (2) simplification in the activation process, and (3) potential scalability. Furthermore, the membranes obtained under optimized conditions outperformed previously reported ZIF-7 membranes for H-2/CO2 separation while showing rather noticeable improvement in H-2 permeance which is roughly 4-10 times higher than the previous counterparts. (C) 2014 Elsevier B.V. All rights reserved</P>
Aceituno Melgar, Ví,ctor Manuel,Kim, Jinsoo,Othman, Mohd Roslee Elsevier 2015 Journal of industrial and engineering chemistry Vol.28 No.-
<P><B>Abstract</B></P> <P>Zeolitic imidazolate framework (ZIF)-based membranes are emerging materials that are highly attractive for gas separation and purification. Highly reproducible defect-free ZIF membranes with well-defined pore structures can be formed in a number of ways. The performance of ZIF membranes depends largely on the preparation technique, application type, and operating conditions. Here, we review the methods of ZIF membrane preparation and discuss their performance in separating condensable and incondensable gases. In addition, recent developments in membrane synthesis and ways to improve the gas separation performance of ZIF membranes are discussed to promote industrial application and commercialization of ZIF membranes.</P>
Víctor Manuel Aceituno Melgar,김진수 한국막학회 2013 멤브레인 Vol.23 No.4
ZIF 재료는 독특한 기체 분리 특성을 포함한 물리적, 화학적 특성 때문에 큰 관심을 받아왔다. 본 연구에서는 α-alumina 지지체 위에 결함 없고 연속적인 ZIF-7 막을 형성하는 새롭고 효율적인 방법이 연구되었다. 지지체 위에 시딩 (seeding)을 하지 않고 직접 ZIF-7 박막을 합성하는데 정전분무법이 처음으로 적용되었다. 이 방법은 전구체 용액을 직접 정 전분무함으로 α-alumina 지지체에 ZIF-7 박막을 형성할 수 있었다. ZIF-7 박막은 XRD, FE-SEM, 단일 기체 투과 장치 등을 이용해 분석하였다. Zeolitic imidazolate frameworks (ZIFs) have been the focus of interest for their physical and chemical properties, especially, for their extraordinary gas separation properties. In this study, a novel and efficient method for the fabrication of continuous ZIF-7 film on α-alumina substrate has been investigated. The electrospray deposition method was tried for the first time to prepare ZIF films directly without the necessity of prior substrate seeding. It has the advantage of depositing thin ZIF-7 films directly on the α-alumina substrate by electrospraying the precursor solution. The ZIF-7 films have been characterized through XRD, FE-SEM, and single gas permeation tests.
Vı´ctor Manuel Aceituno Melgar,김진수,Mohd Roslee Othman 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
Zeolitic imidazolate framework (ZIF)-based membranes are emerging materials that are highlyattractive for gas separation and purification. Highly reproducible defect-free ZIF membranes with well-defined pore structures can be formed in a number of ways. The performance of ZIF membranes dependslargely on the preparation technique, application type, and operating conditions. Here, we review themethods of ZIF membrane preparation and discuss their performance in separating condensable andincondensable gases. In addition, recent developments in membrane synthesis and ways to improve thegas separation performance of ZIF membranes are discussed to promote industrial application andcommercialization of ZIF membranes.
Highly selective micro-porous ZIF-8 membranes prepared by rapid electrospray deposition
Vı´ctor Manuel Aceituno Melgar,안호원,김진수,Mohd Roslee Othman 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Highly selective ZIF-8 membranes were successfully prepared by electrospray deposition for H2/CO2separation. This novel method produced ZIF-8membranes in a facile and time-efficientmanner using anelectrostatic force-assisted coating approach. In addition, the membrane thickness could be controlledeasily by simply varying the deposition time. Results from the experiment indicate that the membraneperformed preeminently in comparison with previously reported glassy and polymeric membranes forH2/CO2 separation. The H2 permeance of the ZIF-8 membrane prepared at 70 8C for 55.71 min was4.23 10 7 mol m 2 s 1 Pa 1 with H2/CO2 selectivity of 20.3.
YSZ-carbonate dual-phase membranes for high temperature carbon dioxide separation
Ahn, Howon,Kim, Daeho,Melgar, Ví,ctor Manuel Aceituno,Kim, Jinsoo,Othman, Mohd Roslee,Nguyen, Hoang Viet Phuc,Han, Jonghee,Yoon, Sung Pil Elsevier 2014 Journal of industrial and engineering chemistry Vol.20 No.5
<P><B>Abstract</B></P> <P>A dense yttria stabilized zirconia (YSZ)-carbonate membrane that was impermeable to gas at low temperature became highly permeable to CO<SUB>2</SUB> at temperature above the melting point of the carbonate. The CO<SUB>2</SUB> permeance across the YSZ-molten carbonate dual-phase membrane was observed to be higher than 0.1×10<SUP>−8</SUP> mol/m<SUP>2</SUP>/Pa/s at temperature >650°C. The movement of ions was promoted at high temperature as YSZ and molten carbonate became highly conductive to oxygen ions and carbonate species, respectively. Addition of poly(methyl methacrylate) (PMMA) during preparation of macroporous YSZ support created interconnected pore structures that were found conducive for carbonate infiltration and integration with the membrane materials.</P>
YSZ-carbonate dual-phase membranes for high temperature carbon dioxide separation
안호원,김대호,Vı´ctor Manuel Aceituno Melgar,김진수,Mohd Roslee Othman,Hoang Viet Phuc Nguyen,한종희,윤성필 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
A dense yttria stabilized zirconia (YSZ)-carbonate membrane that was impermeable to gas at low temperature became highly permeable to CO2 at temperature above the melting point of the carbonate. The CO2 permeance across the YSZ-molten carbonate dual-phase membrane was observed to be higher than 0.1 × 10-8 mol/m2/Pa/s at temperature >650 ℃. The movement of ions was promoted at high temperature as YSZ and molten carbonate became highly conductive to oxygen ions and carbonate species, respectively. Addition of poly(methyl methacrylate) (PMMA) during preparation of macro-porous YSZ support created interconnected pore structures that were found conducive for carbonate infiltration and integration with the membrane materials.