1
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Choudhary A, Ho TA. Confinement-induced clustering of H 2 and CO 2 gas molecules in hydrated nanopores. Phys Chem Chem Phys 2024; 26:10506-10514. [PMID: 38380805 DOI: 10.1039/d3cp06024a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
Gas molecule clustering within nanopores holds significance in the fields of nanofluidics, biology, gas adsorption/desorption, and geological gas storage. However, the intricate roles of nanoconfinement and surface chemistry that govern the formation of gas clusters remain inadequately explored. In this study, through free energy calculation in molecular simulations, we systematically compared the tendencies of H2 and CO2 molecules to aggregate within hydrated hydrophobic pyrophyllite and hydrophilic gibbsite nanopores. The results indicate that nanoconfinement enhances gas dimer formation in the nanopores, irrespective of surface chemistry. However, surface hydrophilicity prohibits the formation of gas clusters larger than dimers, while large gas clusters form easily in hydrophobic nanopores. Despite H2 and CO2 both being non-polar, the larger quadrupole moment of CO2 leads to a stronger preference for dimer/cluster formation compared to H2. Our results also indicate that gases prefer to enter the nanopores as individual molecules, but exit the nanopores as dimers/clusters. This investigation provides a mechanistic understanding of gas cluster formation within nanopores, which is relevant to various applications, including geological gas storage.
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Affiliation(s)
- Aditya Choudhary
- Geochemistry Department, Sandia National Laboratories, Albuquerque, NM 87185, USA.
| | - Tuan A Ho
- Geochemistry Department, Sandia National Laboratories, Albuquerque, NM 87185, USA.
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2
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Li C, Zhang Z, Heinke L. Mass transfer of toluene in a series of metal-organic frameworks: molecular clusters inside the nanopores cause slow and step-like release. Phys Chem Chem Phys 2022; 24:3994-4001. [PMID: 35103267 DOI: 10.1039/d1cp05560g] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The mass transfer of the guest molecules in the pores is fundamental for the application of nanoporous materials like metal-organic frameworks, MOFs. In the present work, we explore the uptake and release of toluene in a series of Zr-based MOFs with different pore sizes. We find that intermolecular guest-guest interaction, sterically controlled by the pore size, has a substantial impact on the release kinetics. While the adsorption is rather fast, the desorption process is many orders of magnitude slower. Depending on the pore size, molecular clusters form, here (most likely) toluene dimers, which are rather stable and their break-up is rate-limiting during the desorption process. This results in a step-like desorption kinetics, deviating from the plain Fickian-diffusion-controlled release. Temperature-dependent experiments show that the minimum and maximum of the release rates are obtained at the same toluene loadings, independent of the temperature. Moreover, the activation energy for the release coincides with the binding energy of a toluene dimer. The work shows the importance of intermolecular guest-guest interaction, controlled by the MOF-nanoconfinement, for the uptake and release from nanoporous materials.
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Affiliation(s)
- Chun Li
- Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
| | - Zejun Zhang
- Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
| | - Lars Heinke
- Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
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3
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Ok S, Hwang B, Liu T, Welch S, Sheets JM, Cole DR, Liu KH, Mou CY. Fluid Behavior in Nanoporous Silica. Front Chem 2020; 8:734. [PMID: 33005606 PMCID: PMC7485247 DOI: 10.3389/fchem.2020.00734] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Accepted: 07/16/2020] [Indexed: 11/13/2022] Open
Abstract
We investigate dynamics of water (H2O) and methanol (CH3OH and CH3OD) inside mesoporous silica materials with pore diameters of 4.0, 2.5, and 1.5 nm using low-field (LF) nuclear magnetic resonance (NMR) relaxometry. Experiments were conducted to test the effects of pore size, pore volume, type of fluid, fluid/solid ratio, and temperature on fluid dynamics. Longitudinal relaxation times (T1) and transverse relaxation times (T2) were obtained for the above systems. We observe an increasing deviation in confined fluid behavior compared to that of bulk fluid with decreasing fluid-to-solid ratio. Our results show that the surface area-to-volume ratio is a critical parameter compared to pore diameter in the relaxation dynamics of confined water. An increase in temperature for the range between 25 and 50°C studied did not influence T2 times of confined water significantly. However, when the temperature was increased, T1 times of water confined in both silica-2.5 nm and silica-1.5 nm increased, while those of water in silica-4.0 nm did not change. Reductions in both T1 and T2 values as a function of fluid-to-solid ratio were independent of confined fluid species studied here. The parameter T1/T2 indicates that H2O interacts more strongly with the pore walls of silica-4.0 nm than CH3OH and CH3OD.
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Affiliation(s)
- Salim Ok
- School of Earth Sciences, The Ohio State University, Columbus, OH, United States
| | - Bohyun Hwang
- School of Earth Sciences, The Ohio State University, Columbus, OH, United States
| | - Tingting Liu
- School of Earth Sciences, The Ohio State University, Columbus, OH, United States
| | - Susan Welch
- School of Earth Sciences, The Ohio State University, Columbus, OH, United States
| | - Julia M. Sheets
- School of Earth Sciences, The Ohio State University, Columbus, OH, United States
| | - David R. Cole
- School of Earth Sciences, The Ohio State University, Columbus, OH, United States
- Department of Chemistry, The Ohio State University, Columbus, OH, United States
| | - Kao-Hsiang Liu
- Shull Wollan Center-A Joint Institute for Neutron Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, United States
| | - Chung-Yuan Mou
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
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4
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Benito J, Sorribas S, Lucas I, Coronas J, Gascon I. Langmuir-Blodgett Films of the Metal-Organic Framework MIL-101(Cr): Preparation, Characterization, and CO2 Adsorption Study Using a QCM-Based Setup. ACS APPLIED MATERIALS & INTERFACES 2016; 8:16486-92. [PMID: 27268426 DOI: 10.1021/acsami.6b04272] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
This work reports the fabrication and characterization of Langmuir-Blodgett films of nanoparticles (size 51 ± 10 nm) of the metal organic framework MIL-101(Cr). LB film characterization by SEM, UV-vis, GIXRD, and QCM has shown that the addition of 1 wt % of behenic acid to MOF dispersion allows obtaining dense monolayers at the air-water interface that can be deposited onto solid substrates of different nature with transfer ratios close to 1. Moreover, a QCM-based setup has been built and used for the first time to measure CO2 adsorption isotherms at 303 K on MOF LB films, proving that LB films with MOF masses between 1.2 (1 layer) and 2.3 (2 layers) μg can be used to obtain accurate adsorption values at 100 kPa, similar to those obtained by conventional adsorption methods that require much larger MOF quantities (tens of milligrams).
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Affiliation(s)
- Javier Benito
- Departamento de Química Física, Facultad de Ciencias and ∥Departamento de Física de la Materia Condensada, Facultad de Ciencias, Universidad de Zaragoza , 50009 Zaragoza, Spain
- Instituto de Nanociencia de Aragón (INA) and §Chemical and Environmental Engineering Department, Universidad de Zaragoza , 50018 Zaragoza, Spain
| | - Sara Sorribas
- Departamento de Química Física, Facultad de Ciencias and ∥Departamento de Física de la Materia Condensada, Facultad de Ciencias, Universidad de Zaragoza , 50009 Zaragoza, Spain
- Instituto de Nanociencia de Aragón (INA) and §Chemical and Environmental Engineering Department, Universidad de Zaragoza , 50018 Zaragoza, Spain
| | - Irene Lucas
- Departamento de Química Física, Facultad de Ciencias and ∥Departamento de Física de la Materia Condensada, Facultad de Ciencias, Universidad de Zaragoza , 50009 Zaragoza, Spain
- Instituto de Nanociencia de Aragón (INA) and §Chemical and Environmental Engineering Department, Universidad de Zaragoza , 50018 Zaragoza, Spain
| | - Joaquin Coronas
- Departamento de Química Física, Facultad de Ciencias and ∥Departamento de Física de la Materia Condensada, Facultad de Ciencias, Universidad de Zaragoza , 50009 Zaragoza, Spain
- Instituto de Nanociencia de Aragón (INA) and §Chemical and Environmental Engineering Department, Universidad de Zaragoza , 50018 Zaragoza, Spain
| | - Ignacio Gascon
- Departamento de Química Física, Facultad de Ciencias and ∥Departamento de Física de la Materia Condensada, Facultad de Ciencias, Universidad de Zaragoza , 50009 Zaragoza, Spain
- Instituto de Nanociencia de Aragón (INA) and §Chemical and Environmental Engineering Department, Universidad de Zaragoza , 50018 Zaragoza, Spain
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5
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Gutiérrez-Sevillano JJ, Calero S, Krishna R. Separation of benzene from mixtures with water, methanol, ethanol, and acetone: highlighting hydrogen bonding and molecular clustering influences in CuBTC. Phys Chem Chem Phys 2015; 17:20114-24. [PMID: 26165859 DOI: 10.1039/c5cp02726h] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Configurational-bias Monte Carlo (CBMC) simulations are used to establish the potential of CuBTC for separation of water/benzene, methanol/benzene, ethanol/benzene, and acetone/benzene mixtures. For operations under pore saturation conditions, the separations are in favor of molecules that partner benzene; this is due to molecular packing effects that disfavor benzene. CBMC simulations for adsorption of quaternary water/methanol/ethanol/benzene mixtures show that water can be selectively adsorbed at pore saturation, making CuBTC effective in drying applications. Ideal Adsorbed Solution Theory (IAST) calculations anticipate the right hierarchy of component loadings but the quantitative agreement with CBMC mixture simulations is poor for all investigated mixtures. The failure of the IAST to provide reasonable quantitative predictions of mixture adsorption is attributable to molecular clustering effects that are induced by hydrogen bonding between water-water, methanol-methanol, and ethanol-ethanol molecule pairs. There is, however, no detectable hydrogen bonding between benzene and partner molecules in the investigated mixtures. As a consequence of molecular clustering, the activity coefficients of benzene in the mixtures is lowered below unity by one to three orders of magnitude at pore saturation; such drastic reductions cannot be adequately captured by the Wilson model, that does not explicitly account for molecular clustering. Molecular clustering effects are also shown to influence the loading dependence of the diffusivities of guest molecules.
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Affiliation(s)
- Juan José Gutiérrez-Sevillano
- Department of Physical, Chemical and Natural Systems, University Pablo de Olavide, Ctra. Utrera km 1, 41013 Sevilla, Spain.
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6
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Zhuang JL, Kind M, Grytz CM, Farr F, Diefenbach M, Tussupbayev S, Holthausen MC, Terfort A. Insight into the Oriented Growth of Surface-Attached Metal–Organic Frameworks: Surface Functionality, Deposition Temperature, and First Layer Order. J Am Chem Soc 2015; 137:8237-43. [DOI: 10.1021/jacs.5b03948] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jin-Liang Zhuang
- Institute
of Inorganic and Analytical Chemistry, University of Frankfurt, Max-von-Laue-Strasse
7, 60438 Frankfurt, Germany
- School
of Chemistry and Materials, Guizhou Normal University, Guiyang, 550001, P. R. China
- State
Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, P. R. China
| | - Martin Kind
- Institute
of Inorganic and Analytical Chemistry, University of Frankfurt, Max-von-Laue-Strasse
7, 60438 Frankfurt, Germany
| | - Claudia M. Grytz
- Institute
of Inorganic and Analytical Chemistry, University of Frankfurt, Max-von-Laue-Strasse
7, 60438 Frankfurt, Germany
| | - Frederic Farr
- Institute
of Inorganic and Analytical Chemistry, University of Frankfurt, Max-von-Laue-Strasse
7, 60438 Frankfurt, Germany
| | - Martin Diefenbach
- Institute
of Inorganic and Analytical Chemistry, University of Frankfurt, Max-von-Laue-Strasse
7, 60438 Frankfurt, Germany
| | - Samat Tussupbayev
- Institute
of Inorganic and Analytical Chemistry, University of Frankfurt, Max-von-Laue-Strasse
7, 60438 Frankfurt, Germany
| | - Max C. Holthausen
- Institute
of Inorganic and Analytical Chemistry, University of Frankfurt, Max-von-Laue-Strasse
7, 60438 Frankfurt, Germany
| | - Andreas Terfort
- Institute
of Inorganic and Analytical Chemistry, University of Frankfurt, Max-von-Laue-Strasse
7, 60438 Frankfurt, Germany
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7
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Furukawa S, Reboul J, Diring S, Sumida K, Kitagawa S. Structuring of metal-organic frameworks at the mesoscopic/macroscopic scale. Chem Soc Rev 2015; 43:5700-34. [PMID: 24811425 DOI: 10.1039/c4cs00106k] [Citation(s) in RCA: 489] [Impact Index Per Article: 54.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The assembly of metal ions with organic ligands through the formation of coordination bonds gives crystalline framework materials, known as metal-organic frameworks (MOFs), which recently emerged as a new class of porous materials. Besides the structural designability of MOFs at the molecular length scale, the researchers in this field very recently made important advances in creating more complex architectures at the mesoscopic/macroscopic scale, in which MOF nanocrystals are used as building units to construct higher-order superstructures. The structuring of MOFs in such a hierarchical order certainly opens a new opportunity to improve the material performance via design of the physical form rather than altering the chemical component. This review highlights these superstructures and their applications by categorizing them into four dimensionalities, zero-dimensional (0D), one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D) superstructures. Because the key issue for structuring of MOFs is to spatially control the nucleation process in desired locations, this review conceptually categorizes the available synthetic methodologies from the viewpoint of the reaction system.
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Affiliation(s)
- Shuhei Furukawa
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan.
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8
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Yim C, Jeon S. Direct synthesis of Cu-BDC frameworks on a quartz crystal microresonator and their application to studies of n-hexane adsorption. RSC Adv 2015. [DOI: 10.1039/c5ra11686d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Cu-BDC frameworks were synthesized from metallic copper and the adsorption of n-hexane vapor was investigated by using a quartz crystal microbalance.
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Affiliation(s)
- Changyong Yim
- Department of Chemical Engineering
- Pohang University of Science and Technology (POSTECH)
- Pohang
- Republic of Korea
| | - Sangmin Jeon
- Department of Chemical Engineering
- Pohang University of Science and Technology (POSTECH)
- Pohang
- Republic of Korea
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9
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Zheng B, Huang KW, Du H. Theoretical model estimation of guest diffusion in metal–organic frameworks (MOFs). RSC Adv 2015. [DOI: 10.1039/c5ra11325c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An analytical model was developed to efficiently and accurately estimate the guest diffusivity in flexible metal–organic frameworks (MOFs).
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Affiliation(s)
- B. Zheng
- School of Materials Science and Engineering
- Xi'an University of Science and Technology
- Xi'an 710054
- PR China
| | - K.-W. Huang
- Division of Physical Sciences and Engineering and KAUST Catalysis Centre
- King Abdullah University of Science and Technology (KAUST)
- Saudi Arabia
| | - H. Du
- School of Materials Science and Engineering
- Xi'an University of Science and Technology
- Xi'an 710054
- PR China
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10
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Blanchard F, Sumida K, Wolpert C, Tsotsalas M, Tanaka T, Doi A, Kitagawa S, Cooke DG, Furukawa S, Tanaka K. Terahertz phase contrast imaging of sorption kinetics in porous coordination polymer nanocrystals using differential optical resonator. OPTICS EXPRESS 2014; 22:11061-11069. [PMID: 24921804 DOI: 10.1364/oe.22.011061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The enhancement of light-matter coupling when light is confined to wavelength scale volumes is useful both for studying small sample volumes and increasing the overall sensing ability. At these length scales, nonradiative interactions are of key interest to which near-field optical techniques may reveal new phenomena facilitating next-generation material functionalities and applications. Efforts to develop novel chemical or biological sensors using metamaterials have yielded innovative ideas in the optical and terahertz frequency range whereby the spatially integrated response over a resonator structure is monitored via the re-radiated or leaked light. But although terahertz waves generally exhibit distinctive response in chemical molecules or biological tissue, there is little absorption for subwavelength size sample and therefore poor image contrast. Here, we introduce a method that spatially resolves the differential near-field phase response of the entire resonator as a spectral fingerprint. By simultaneously probing two metallic ring resonators, where one loaded with the sample of interest, the differential phase response is able to resolve the presence of guest molecules (e.g. methanol) as they are adsorbed or released within the pores of a prototypical porous coordination polymer.
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11
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Kärger J, Binder T, Chmelik C, Hibbe F, Krautscheid H, Krishna R, Weitkamp J. Microimaging of transient guest profiles to monitor mass transfer in nanoporous materials. NATURE MATERIALS 2014; 13:333-343. [PMID: 24651427 DOI: 10.1038/nmat3917] [Citation(s) in RCA: 119] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Accepted: 02/18/2014] [Indexed: 06/03/2023]
Abstract
The intense interactions of guest molecules with the pore walls of nanoporous materials is the subject of continued fundamental research. Stimulated by their thermal energy, the guest molecules in these materials are subject to a continuous, irregular motion, referred to as diffusion. Diffusion, which is omnipresent in nature, influences the efficacy of nanoporous materials in reaction and separation processes. The recently introduced techniques of microimaging by interference and infrared microscopy provide us with a wealth of information on diffusion, hitherto inaccessible from commonly used techniques. Examples include the determination of surface barriers and the sticking coefficient's analogue, namely the probability that, on colliding with the particle surface, a molecule may continue its diffusion path into the interior. Microimaging is further seen to open new vistas in multicomponent guest diffusion (including the detection of a reversal in the preferred diffusion pathways), in guest-induced phase transitions in nanoporous materials and in matching the results of diffusion studies under equilibrium and non-equilibrium conditions.
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Affiliation(s)
- Jörg Kärger
- Department of Interface Physics, University of Leipzig, Linnestrasse 5, 04103 Leipzig, Germany
| | - Tomas Binder
- Department of Interface Physics, University of Leipzig, Linnestrasse 5, 04103 Leipzig, Germany
| | - Christian Chmelik
- Department of Interface Physics, University of Leipzig, Linnestrasse 5, 04103 Leipzig, Germany
| | - Florian Hibbe
- Department of Interface Physics, University of Leipzig, Linnestrasse 5, 04103 Leipzig, Germany
| | - Harald Krautscheid
- Institute of Inorganic Chemistry, University of Leipzig, Johannisallee 29, 04103 Leipzig, Germany
| | - Rajamani Krishna
- Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Jens Weitkamp
- Institute of Chemical Technology, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
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12
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Falcaro P, Ricco R, Doherty CM, Liang K, Hill AJ, Styles MJ. MOF positioning technology and device fabrication. Chem Soc Rev 2014; 43:5513-60. [DOI: 10.1039/c4cs00089g] [Citation(s) in RCA: 531] [Impact Index Per Article: 53.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Methods for permanent localisation, dynamic localisation and spatial control of functional materials within MOF crystals are critical for the development of miniaturised MOF-based devices for a number of technological applications.
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Affiliation(s)
- Paolo Falcaro
- CSIRO Materials Science and Engineering
- Clayton, Australia
| | - Raffaele Ricco
- CSIRO Materials Science and Engineering
- Clayton, Australia
| | | | - Kang Liang
- CSIRO Process Science and Engineering
- Clayton, Australia
| | - Anita J. Hill
- CSIRO Process Science and Engineering
- Clayton, Australia
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13
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Khaletskaya K, Reboul J, Meilikhov M, Nakahama M, Diring S, Tsujimoto M, Isoda S, Kim F, Kamei KI, Fischer RA, Kitagawa S, Furukawa S. Integration of Porous Coordination Polymers and Gold Nanorods into Core–Shell Mesoscopic Composites toward Light-Induced Molecular Release. J Am Chem Soc 2013; 135:10998-1005. [DOI: 10.1021/ja403108x] [Citation(s) in RCA: 153] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Kira Khaletskaya
- Institute for Integrated Cell-Material
Sciences (WPI-iCeMS), Kyoto University,
Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
- Department of Inorganic
Chemistry
II, Ruhr University Bochum, Universitätsstrasse
150, 44780 Bochum, Germany
| | - Julien Reboul
- Institute for Integrated Cell-Material
Sciences (WPI-iCeMS), Kyoto University,
Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Mikhail Meilikhov
- Institute for Integrated Cell-Material
Sciences (WPI-iCeMS), Kyoto University,
Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Masashi Nakahama
- Department of Synthetic Chemistry
and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510,
Japan
| | - Stéphane Diring
- Institute for Integrated Cell-Material
Sciences (WPI-iCeMS), Kyoto University,
Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Masahiko Tsujimoto
- Institute for Integrated Cell-Material
Sciences (WPI-iCeMS), Kyoto University,
Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Seiji Isoda
- Institute for Integrated Cell-Material
Sciences (WPI-iCeMS), Kyoto University,
Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Franklin Kim
- Institute for Integrated Cell-Material
Sciences (WPI-iCeMS), Kyoto University,
Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Ken-ichiro Kamei
- Institute for Integrated Cell-Material
Sciences (WPI-iCeMS), Kyoto University,
Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Roland A. Fischer
- Department of Inorganic
Chemistry
II, Ruhr University Bochum, Universitätsstrasse
150, 44780 Bochum, Germany
| | - Susumu Kitagawa
- Institute for Integrated Cell-Material
Sciences (WPI-iCeMS), Kyoto University,
Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
- Department of Synthetic Chemistry
and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510,
Japan
| | - Shuhei Furukawa
- Institute for Integrated Cell-Material
Sciences (WPI-iCeMS), Kyoto University,
Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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14
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Krishna R, van Baten JM. Influence of adsorption thermodynamics on guest diffusivities in nanoporous crystalline materials. Phys Chem Chem Phys 2013; 15:7994-8016. [PMID: 23628965 DOI: 10.1039/c3cp50449b] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Published experimental data, underpinned by molecular simulations, are used to highlight the strong influence of adsorption thermodynamics on diffusivities of guest molecules inside ordered nanoporous crystalline materials such as zeolites, metal-organic frameworks (MOFs), and zeolitic imidazolate frameworks (ZIFs). For cage-type structures (e.g. LTA, CHA, DDR, and ZIF-8), the variation of the free energy barrier for inter-cage hopping across the narrow windows, -δFi, provides a rationalization of the observed strong influence of pore concentrations, ci, on diffusivities. In open structures with large pore volumes (e.g. FAU, IRMOF-1, CuBTC) and within channels (MFI, BEA, MgMOF-74, MIL-47, MIL-53), the pore concentration (ci) dependence of the self- (Di,self), Maxwell-Stefan (Đi), and Fick (Di) diffusivities are often strongly dictated by the inverse thermodynamic correction factor, 1/Γi≡∂ln ci/∂ln pi; the magnitudes of the diffusivities are dictated by the binding energies for adsorption. For many guest-host combinations Đi-ci dependence is directly related to the 1/Γivs. ci variation. When molecular clustering occurs, we get 1/Γi > 1, causing unusual Đivs. ci dependencies. The match, or mis-match, between the periodicity of the pore landscape and the conformations of adsorbed chain molecules often leads to non-monotonic variation of diffusivities with chain lengths.
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Affiliation(s)
- Rajamani Krishna
- Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.
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