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Min H, Kwon O, Lee J, Choi E, Kim J, Lee N, Eum K, Lee KH, Kim DW, Lee W. N-Carbon-Doped Binary Nanophase of Metal Oxide/Metal-Organic Framework for Extremely Sensitive and Selective Gas Response. Adv Mater 2024; 36:e2309041. [PMID: 38041566 DOI: 10.1002/adma.202309041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 11/09/2023] [Indexed: 12/03/2023]
Abstract
Metal-organic frameworks (MOFs), which are highly ordered structures exhibiting sub-nanometer porosity, possess significant potential for diverse gas applications. However, their inherent insulative properties limit their utility in electrochemical gas sensing. This investigation successfully modifies the electrical conductivity of zeolitic imidazolte framework-8 (ZIF-8) employing a straightforward surface oxidation methodology. A ZIF-8 polycrystalline layer is applied on a wafer-scale oxide substrate and subjects to thermal annealing at 300 °C under ambient air conditions, resulting in nanoscale oxide layers while preserving the fundamental properties of the ZIF-8. Subsequent exposure to NO2 instigates the evolution of an electrically interconnected structure with the formation of electron-rich dopants derived from the decomposition of nitrogen-rich organic linkers. The N-carbon-hybridized ZnO/ZIF-8 device demonstrates remarkable sensitivity (≈130 ppm-1 ) and extreme selectivity in NO2 gas detection with a lower detection limit of 0.63 ppb under 150 °C operating temperature, surpassing the performance of existing sensing materials. The exceptional performances result from the Debye length scale dimensionality of ZnO and the high affinity of ZIF-8 to NO2 . The methodology for manipulating MOF conductivity through surface oxidation holds the potential to accelerate the development of MOF-hybridized conductive channels for a variety of electrical applications.
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Affiliation(s)
- Hyegi Min
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
- KIURI Institute, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
- Nick J. Holonyak Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Ohchan Kwon
- Department of Chemical and Biomolecular Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, Republic of Korea
- Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA
| | - Jihyun Lee
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Eunji Choi
- Department of Chemical and Biomolecular Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Jihee Kim
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Nahyeon Lee
- School of Chemical Engineering, Soongsil University, Seoul, 06978, Republic of Korea
| | - Kiwon Eum
- School of Chemical Engineering, Soongsil University, Seoul, 06978, Republic of Korea
| | - Kyu Hyoung Lee
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Dae Woo Kim
- Department of Chemical and Biomolecular Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Wooyoung Lee
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
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Yu C, Kim YJ, Kim J, Eum K. ZIF-L to ZIF-8 Transformation: Morphology and Structure Controls. Nanomaterials (Basel) 2022; 12:4224. [PMID: 36500846 PMCID: PMC9740542 DOI: 10.3390/nano12234224] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 11/24/2022] [Accepted: 11/24/2022] [Indexed: 06/17/2023]
Abstract
The control of the structure, shape, and components of metal-organic frameworks, in which metal ions and organic ligands coordinate to form crystalline nanopore structures, plays an important role in the use of many electrochemical applications, such as energy storage, high-performance photovoltaic devices, and supercapacitors. In this study, systematic controls of synthesis variables were performed to control the morphology of ZIF-8 during the ZIF-L-to-ZIF-8 transformation of ZIF-L, which has the same building block as ZIF-8 but forms a two-dimensional structure. Furthermore, additional precursors or surfactants (Zn2+, 2mIm, and CTAB) were introduced during the transition to determine whether the alteration could be regulated. Lastly, the partial substitution insertion of a new organic precursor, 2abIm, during the ZIF-L-to-ZIF-8 transformation of ZIF-L was achieved, and modulation of the adsorption and pore characteristics (suppression of gate-opening properties of ZIF-8) has been confirmed.
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Choi E, Choi JI, Kim Y, Kim YJ, Eum K, Choi Y, Kwon O, Kim M, Choi W, Ji H, Jang SS, Kim DW. Graphene Nanoribbon Hybridization of Zeolitic Imidazolate Framework Membranes for Intrinsic Molecular Separation. Angew Chem Int Ed Engl 2022; 61:e202214269. [DOI: 10.1002/anie.202214269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Indexed: 11/05/2022]
Affiliation(s)
- Eunji Choi
- Department of Chemical and Biomolecular Engineering Yonsei University Yonsei-ro 50, Seodaemun-gu Seoul 03722 (Republic of Korea
| | - Ji Il Choi
- School of Materials Science and Engineering Georgia Institute of Technology 771 Ferst Drive NW Atlanta USA
| | - Yong‐Jae Kim
- Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology Daehak-ro 291, Yuseong-gu Daejeon 34141 (Republic of Korea
| | - Yeong Jae Kim
- Department of Chemical Engineering Soongsil University Sangdo-ro 369, Dongjak-gu Seoul 06978 (Republic of Korea
| | - Kiwon Eum
- Department of Chemical Engineering Soongsil University Sangdo-ro 369, Dongjak-gu Seoul 06978 (Republic of Korea
| | - Yunkyu Choi
- Department of Chemical and Biomolecular Engineering Yonsei University Yonsei-ro 50, Seodaemun-gu Seoul 03722 (Republic of Korea
| | - Ohchan Kwon
- Department of Chemical and Biomolecular Engineering Yonsei University Yonsei-ro 50, Seodaemun-gu Seoul 03722 (Republic of Korea
| | - Minsu Kim
- Department of Chemical and Biomolecular Engineering Yonsei University Yonsei-ro 50, Seodaemun-gu Seoul 03722 (Republic of Korea
| | - Wooyoung Choi
- Department of Chemical and Biomolecular Engineering Yonsei University Yonsei-ro 50, Seodaemun-gu Seoul 03722 (Republic of Korea
| | - Hyungjoon Ji
- Department of Chemical and Biomolecular Engineering Yonsei University Yonsei-ro 50, Seodaemun-gu Seoul 03722 (Republic of Korea
| | - Seung Soon Jang
- School of Materials Science and Engineering Georgia Institute of Technology 771 Ferst Drive NW Atlanta USA
| | - Dae Woo Kim
- Department of Chemical and Biomolecular Engineering Yonsei University Yonsei-ro 50, Seodaemun-gu Seoul 03722 (Republic of Korea
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Kim T, Kim YJ, Yu C, Kim J, Eum K. Facile Fabrication of α-Alumina Hollow Fiber-Supported ZIF-8 Membrane Module and Impurity Effects on Propylene Separation Performance. Membranes (Basel) 2022; 12:1015. [PMID: 36295774 PMCID: PMC9609772 DOI: 10.3390/membranes12101015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 10/06/2022] [Accepted: 10/18/2022] [Indexed: 06/16/2023]
Abstract
The separation of C3 olefin and paraffin, which is essential for the production of propylene, can be facilitated by the ZIF-8 membrane. However, the commercial application of the membrane has not yet been achieved because the fabrication process does not meet industrial regulatory criteria. In this work, we provide a straightforward and cost-effective membrane fabrication technique that permits the rapid synthesis of ZIF-8 hollow fiber membranes. The scalability of the technology was confirmed by the incorporation of three ZIF-8 hollow fiber membranes into a single module using an introduced fiber mounting methodology. The molecular sieving characteristics of the ZIF-8 membrane module on a binary combination of C3 olefin and paraffin (C3H6/C3H8 selectivity of 110 and a C3H6 permeance of 13 GPU) were examined at atmospheric conditions. In addition, the high-pressure performance of these membranes was demonstrated at a 5 bar of equimolar binary feed pressure with a C3H6/C3H8 selectivity of 55 and a C3H6 permeance of 9 GPU due to propylene adsorption site saturation. To further accurately portray the separation performance of the membrane on an actual industrial feed, the effect of impurities (ethylene, ethane, butylene, i-butane, and n-butane), which can be found in C3 splitters, was investigated and a considerable decrement (~15%) in the propylene permeance upon an interaction with C4 hydrocarbons was confirmed. Finally, the long-term stability of the ZIF-8 membrane was confirmed by continuous operation for almost a month without any loss of its initial performance (C3H6/C3H8 separation factor of 110 and a C3H6 permeance of 13 GPU). From an industrial point of view, this straightforward technique could offer a number of merits such as a short synthesis time, minimal chemical requirements, and excellent reproductivity.
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Choi E, Choi JI, Kim YJ, Kim YJ, Eum K, Choi Y, Kwon O, Kim M, Choi W, Ji H, Jang SS, Kim DW. Graphene Nanoribbon Hybridization of Zeolitic Imidazolate Framework Membranes for Intrinsic Molecular Separation. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202214269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Eunji Choi
- Yonsei University Chemical and biomolecular engineering KOREA, REPUBLIC OF
| | - Ji Il Choi
- Georgia Institute of Technology School of Materials Science and Engineering KOREA, REPUBLIC OF
| | - Yong-Jae Kim
- Korea Advanced Institute of Science and Technology Chemical and biomolecular engineering KOREA, REPUBLIC OF
| | - Yeong Jae Kim
- Soongsil University Chemical engineering KOREA, REPUBLIC OF
| | - Kiwon Eum
- Soongsil University Chemical engineering KOREA, REPUBLIC OF
| | - Yunkyu Choi
- Yonsei University Chemical and biomolecular engineering KOREA, REPUBLIC OF
| | - Ohchan Kwon
- Yonsei University Chemical and biomolecular engineering KOREA, REPUBLIC OF
| | - Minsu Kim
- Yonsei University Chemical and biomolecular engineering KOREA, REPUBLIC OF
| | - Wooyoung Choi
- Yonsei University Chemical and biomolecular engineering KOREA, REPUBLIC OF
| | - Hyungjoon Ji
- Yonsei University Chemical and biomolecular engineering KOREA, REPUBLIC OF
| | - Seung Soon Jang
- Georgia Institute of Technology Chemical and biomolecular engineering KOREA, REPUBLIC OF
| | - Dae Woo Kim
- Yonsei University GS-Caltex building #309, Department of Chemical and Biomolecular Engineering 03722 Seoul KOREA, REPUBLIC OF
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Park K, Hyeon S, Kang KM, Eum K, Kim J, Kim DW, Jung HT. Long-Range alignment of liquid crystalline small molecules on Metal-Organic framework micropores by physical anchoring. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2021.09.039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Eum K, Yang S, Min B, Ma C, Drese JH, Tamhankar Y, Nair S. All-Nanoporous Hybrid Membranes: Incorporating Zeolite Nanoparticles and Nanosheets with Zeolitic Imidazolate Framework Matrices. ACS Appl Mater Interfaces 2020; 12:27368-27377. [PMID: 32462877 DOI: 10.1021/acsami.0c06227] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Metal-organic framework (MOF) membranes have attractive molecular separation properties but require challenging thin-film deposition techniques on expensive/specialty supports to obtain high performance relative to conventional polymer membranes. We demonstrate and analyze in detail the new concept of all-nanoporous hybrid membranes (ANHMs), which combines two or more nanoporous materials of different morphologies into a single membrane without the use of any polymeric materials. This allows access to a previously inaccessible region of very high permeability and selectivity properties, a feature that enables ANHMs to show high performance even when fabricated with simple coating and solvent evaporation methods on low-cost supports. We synthesize several types of ANHMs that combine the MOF material ZIF-8 with the high-silica zeolite MFI (the latter being employed in both nanoparticle and nanosheet forms). We show that continuous ANHMs can be obtained with high (∼50%) volume fractions of both MOF and zeolite components. Analysis of the multilayer microstructures of these ANHMs by multiple techniques allows estimation of the propylene/propane separation properties of individual ANHM layers, providing initial insight into the dramatically increased permeability and selectivity observed in ANHMs in relation to single-phase nanoporous membranes.
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Affiliation(s)
- Kiwon Eum
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
| | - Shaowei Yang
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
| | - Byunghyun Min
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
| | - Chen Ma
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
| | - Jeffrey H Drese
- Phillips 66 Research Center, Phillips 66 Company, CPL-02-218, Highway 60 & 123, Bartlesville, Oklahoma 74003, United States
| | - Yash Tamhankar
- Phillips 66 Research Center, Phillips 66 Company, CPL-02-218, Highway 60 & 123, Bartlesville, Oklahoma 74003, United States
| | - Sankar Nair
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
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Eum K, Hayashi M, De Mello MD, Xue F, Kwon HT, Tsapatsis M. Frontispiece: ZIF‐8 Membrane Separation Performance Tuning by Vapor Phase Ligand Treatment. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/anie.201984661] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Kiwon Eum
- Department of Chemical Engineering and Materials Science University of Minnesota 421 Washington Ave. SE Minneapolis MN 55455-0132 USA
| | - Mikio Hayashi
- Department of Chemical Engineering and Materials Science University of Minnesota 421 Washington Ave. SE Minneapolis MN 55455-0132 USA
- Science & Innovation Center Mitsubishi Chemical Corporation 1000 Kamoshida-cho, Aoba-ku Yokohama-shi Kanagawa 227-8502 Japan
- Department of Chemical and Biomolecular Engineering & Institute for NanoBioTechnology Johns Hopkins University 3400 N. Charles Street Baltimore MD 21218 USA
| | - Matheus Dorneles De Mello
- Department of Chemical Engineering and Materials Science University of Minnesota 421 Washington Ave. SE Minneapolis MN 55455-0132 USA
| | - Feng Xue
- Department of Chemical Engineering and Materials Science University of Minnesota 421 Washington Ave. SE Minneapolis MN 55455-0132 USA
| | - Hyuk Taek Kwon
- Department of Chemical Engineering Pukyong National University 45 Yongso-ro, Nam-gu Busan 48513 South Korea
| | - Michael Tsapatsis
- Department of Chemical Engineering and Materials Science University of Minnesota 421 Washington Ave. SE Minneapolis MN 55455-0132 USA
- Department of Chemical and Biomolecular Engineering & Institute for NanoBioTechnology Johns Hopkins University 3400 N. Charles Street Baltimore MD 21218 USA
- Applied Physics Laboratory Johns Hopkins University 11100 Johns Hopkins Road Laurel MB 20723 USA
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Eum K, Hayashi M, De Mello MD, Xue F, Kwon HT, Tsapatsis M. Frontispiz: ZIF‐8 Membrane Separation Performance Tuning by Vapor Phase Ligand Treatment. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201984661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Kiwon Eum
- Department of Chemical Engineering and Materials Science University of Minnesota 421 Washington Ave. SE Minneapolis MN 55455-0132 USA
| | - Mikio Hayashi
- Department of Chemical Engineering and Materials Science University of Minnesota 421 Washington Ave. SE Minneapolis MN 55455-0132 USA
- Science & Innovation Center Mitsubishi Chemical Corporation 1000 Kamoshida-cho, Aoba-ku Yokohama-shi Kanagawa 227-8502 Japan
- Department of Chemical and Biomolecular Engineering & Institute for NanoBioTechnology Johns Hopkins University 3400 N. Charles Street Baltimore MD 21218 USA
| | - Matheus Dorneles De Mello
- Department of Chemical Engineering and Materials Science University of Minnesota 421 Washington Ave. SE Minneapolis MN 55455-0132 USA
| | - Feng Xue
- Department of Chemical Engineering and Materials Science University of Minnesota 421 Washington Ave. SE Minneapolis MN 55455-0132 USA
| | - Hyuk Taek Kwon
- Department of Chemical Engineering Pukyong National University 45 Yongso-ro, Nam-gu Busan 48513 South Korea
| | - Michael Tsapatsis
- Department of Chemical Engineering and Materials Science University of Minnesota 421 Washington Ave. SE Minneapolis MN 55455-0132 USA
- Department of Chemical and Biomolecular Engineering & Institute for NanoBioTechnology Johns Hopkins University 3400 N. Charles Street Baltimore MD 21218 USA
- Applied Physics Laboratory Johns Hopkins University 11100 Johns Hopkins Road Laurel MB 20723 USA
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Eum K, Hayashi M, De Mello MD, Xue F, Kwon HT, Tsapatsis M. ZIF-8 Membrane Separation Performance Tuning by Vapor Phase Ligand Treatment. Angew Chem Int Ed Engl 2019; 58:16390-16394. [PMID: 31568623 DOI: 10.1002/anie.201909490] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Indexed: 11/11/2022]
Abstract
Vapor phase ligand treatment (VPLT) of 2-aminobenzimidazole (2abIm) for 2-methylimidazole (2mIm) in ZIF-8 membranes prepared by two different methods (LIPS: ligand induced permselectivation and RTD: rapid thermal deposition) results in a notable shift of the molecular level cut-off to smaller molecules establishing selectivity improvements from ca. 1.8 to 5 for O2 /N2 ; 2.2 to 32 for CO2 /CH4 ; 2.4 to 24 for CO2 /N2 ; 4.8 to 140 for H2 /CH4 and 5.2 to 126 for H2 /N2 . Stable (based on a one-week test) oxygen-selective air separation performance at ambient temperature, 7 bar(a) feed, and 1 bar(a) sweep-free permeate with a mixture separation factor of 4.5 and oxygen flux of 2.6×10-3 mol m-2 s-1 is established. LIPS and RTD membranes exhibit fast and gradual evolution upon a 2abIm-VPLT, respectively, reflecting differences in their thickness and microstructure. Functional reversibility is demonstrated by showing that the original permeation properties of the VPLT-LIPS membranes can be recovered upon 2mIm-VPLT.
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Affiliation(s)
- Kiwon Eum
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE, Minneapolis, MN, 55455-0132, USA
| | - Mikio Hayashi
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE, Minneapolis, MN, 55455-0132, USA.,Science & Innovation Center, Mitsubishi Chemical Corporation, 1000 Kamoshida-cho, Aoba-ku, Yokohama-shi, Kanagawa, 227-8502, Japan.,Department of Chemical and Biomolecular Engineering & Institute for NanoBioTechnology, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD, 21218, USA
| | - Matheus Dorneles De Mello
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE, Minneapolis, MN, 55455-0132, USA
| | - Feng Xue
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE, Minneapolis, MN, 55455-0132, USA
| | - Hyuk Taek Kwon
- Department of Chemical Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan, 48513, South Korea
| | - Michael Tsapatsis
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE, Minneapolis, MN, 55455-0132, USA.,Department of Chemical and Biomolecular Engineering & Institute for NanoBioTechnology, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD, 21218, USA.,Applied Physics Laboratory, Johns Hopkins University, 11100 Johns Hopkins Road, Laurel, MB, 20723, USA
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Eum K, Ma C, Rownaghi A, Jones CW, Nair S. ZIF-8 Membranes via Interfacial Microfluidic Processing in Polymeric Hollow Fibers: Efficient Propylene Separation at Elevated Pressures. ACS Appl Mater Interfaces 2016; 8:25337-42. [PMID: 27602800 DOI: 10.1021/acsami.6b08801] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Propylene/propane (C3H6/C3H8) separations are performed on a large scale by energy-intensive distillation processes. Membranes based on metal-organic framework (MOF) molecular sieves, such as zeolitic imidazolate framework-8 (ZIF-8), offer the potential to perform these separations at considerably lower cost. However, the fabrication of scalable ZIF-8 membranes with high performance at elevated pressures and temperatures is challenging. We report the fabrication of high-quality ZIF-8 hollow fiber membranes in engineered polymeric hollow fibers via the interfacial microfluidic membrane processing (IMMP) technique. Control of fiber microstructure, as well as optimization of IMMP conditions, allow us to achieve a C3H6/C3H8 separation factor of 180 (at 1 bar and 25 °C), which remains high (60) at 120 °C. Furthermore, high-pressure operation of these membranes was investigated. Detailed permeation measurements indicate excellent suppression of defects at higher pressures up to 9.5 bar, allowing a C3H6/C3H8 separation factor of 90 at 9.5 bar. The membranes also display a 4-fold increase in flux at 9.5 bar as compared to operation at 1 bar. The long-term stability of the ZIF-8 hollow fiber membranes is demonstrated by continuous operation over a month without loss of C3H6 permeance or selectivity.
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Affiliation(s)
- Kiwon Eum
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Chen Ma
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
- School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou 510640, China
| | - Ali Rownaghi
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Christopher W Jones
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Sankar Nair
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
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Eum K, Jayachandrababu KC, Rashidi F, Zhang K, Leisen J, Graham S, Lively RP, Chance RR, Sholl DS, Jones CW, Nair S. Highly Tunable Molecular Sieving and Adsorption Properties of Mixed-Linker Zeolitic Imidazolate Frameworks. J Am Chem Soc 2015; 137:4191-7. [DOI: 10.1021/jacs.5b00803] [Citation(s) in RCA: 163] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Kiwon Eum
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
| | - Krishna C. Jayachandrababu
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
| | - Fereshteh Rashidi
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
| | - Ke Zhang
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
| | - Johannes Leisen
- School
of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Samuel Graham
- Woodruff
School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0405, United States
| | - Ryan P. Lively
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
| | - Ronald R. Chance
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
| | - David S. Sholl
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
| | - Christopher W. Jones
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
- School
of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Sankar Nair
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
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Brown AJ, Brunelli NA, Eum K, Rashidi F, Johnson JR, Koros WJ, Jones CW, Nair S. Separation membranes. Interfacial microfluidic processing of metal-organic framework hollow fiber membranes. Science 2014; 345:72-5. [PMID: 24994649 DOI: 10.1126/science.1251181] [Citation(s) in RCA: 386] [Impact Index Per Article: 38.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Molecular sieving metal-organic framework (MOF) membranes have great potential for energy-efficient chemical separations, but a major hurdle is the lack of a scalable and inexpensive membrane fabrication mechanism. We describe a route for processing MOF membranes in polymeric hollow fibers, combining a two-solvent interfacial approach for positional control over membrane formation (at inner and outer surfaces, or in the bulk, of the fibers), a microfluidic approach to replenishment or recycling of reactants, and an in situ module for membrane fabrication and permeation. We fabricated continuous molecular sieving ZIF-8 membranes in single and multiple poly(amide-imide) hollow fibers, with H2/C3H8 and C3H6/C3H8 separation factors as high as 370 and 12, respectively. We also demonstrate positional control of the ZIF-8 films and characterize the contributions of membrane defects and lumen bypass.
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Affiliation(s)
- Andrew J Brown
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Nicholas A Brunelli
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA. Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH 43210, USA
| | - Kiwon Eum
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Fereshteh Rashidi
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - J R Johnson
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - William J Koros
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Christopher W Jones
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA. School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
| | - Sankar Nair
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
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Speca DJ, Ogata G, Mandikian D, Bishop HI, Wiler SW, Eum K, Wenzel HJ, Doisy ET, Matt L, Campi KL, Golub MS, Nerbonne JM, Hell JW, Trainor BC, Sack JT, Schwartzkroin PA, Trimmer JS. Deletion of the Kv2.1 delayed rectifier potassium channel leads to neuronal and behavioral hyperexcitability. Genes Brain Behav 2014; 13:394-408. [PMID: 24494598 DOI: 10.1111/gbb.12120] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Revised: 12/28/2013] [Accepted: 01/31/2014] [Indexed: 12/29/2022]
Abstract
The Kv2.1 delayed rectifier potassium channel exhibits high-level expression in both principal and inhibitory neurons throughout the central nervous system, including prominent expression in hippocampal neurons. Studies of in vitro preparations suggest that Kv2.1 is a key yet conditional regulator of intrinsic neuronal excitability, mediated by changes in Kv2.1 expression, localization and function via activity-dependent regulation of Kv2.1 phosphorylation. Here we identify neurological and behavioral deficits in mutant (Kv2.1(-/-) ) mice lacking this channel. Kv2.1(-/-) mice have grossly normal characteristics. No impairment in vision or motor coordination was apparent, although Kv2.1(-/-) mice exhibit reduced body weight. The anatomic structure and expression of related Kv channels in the brains of Kv2.1(-/-) mice appear unchanged. Delayed rectifier potassium current is diminished in hippocampal neurons cultured from Kv2.1(-/-) animals. Field recordings from hippocampal slices of Kv2.1(-/-) mice reveal hyperexcitability in response to the convulsant bicuculline, and epileptiform activity in response to stimulation. In Kv2.1(-/-) mice, long-term potentiation at the Schaffer collateral - CA1 synapse is decreased. Kv2.1(-/-) mice are strikingly hyperactive, and exhibit defects in spatial learning, failing to improve performance in a Morris Water Maze task. Kv2.1(-/-) mice are hypersensitive to the effects of the convulsants flurothyl and pilocarpine, consistent with a role for Kv2.1 as a conditional suppressor of neuronal activity. Although not prone to spontaneous seizures, Kv2.1(-/-) mice exhibit accelerated seizure progression. Together, these findings suggest homeostatic suppression of elevated neuronal activity by Kv2.1 plays a central role in regulating neuronal network function.
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Affiliation(s)
- D J Speca
- Department of Neurobiology, Physiology and Behavior, College of Biological Sciences
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