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Chen L, Yi Y, Lan H, Wu J, Yang J, Wu S, Yang W, Lu Z, Peng Q. Dielectric Properties of Benzocyclobutene-Based Resin: A Molecular Dynamics Study. J Phys Chem B 2024; 128:340-349. [PMID: 38152041 DOI: 10.1021/acs.jpcb.3c06782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2023]
Abstract
Benzocyclobutene (BCB)-based resins have garnered considerable attention because of their remarkable dielectric properties and thermal stability. However, in molecular dynamics (MD) simulations, progress in BCB-based resin research has yet to keep pace with experimental advancements, resulting in a shortage of theoretical underpinnings at the molecular level. This study focuses on a novel homopolymer, poly(2-(4-benzocyclobutenyl)-divinylbenzene(DVB-S-BCB)), and devises an interactive methodology suitable for BCB-based resins. We implemented a Python script for the joint relaxation method to construct a three-dimensional model of the cured polymer using MadeA and LAMMPS. We conducted MD simulations to investigate how the cross-linking degree and resin molecular weight influence the dielectric properties of the cured polymer. Furthermore, we analyzed the thermodynamic properties through simulation. The results illustrate that augmenting the cross-linking degree and resin molecular weight results in a higher cross-linking density and reduced free volume, thereby increasing the dielectric constant of the resin. The cross-link density does not increase indefinitely with molecular weight, and after a certain threshold is reached, it cannot have a significant effect on the dielectric constant. The degree of cross-linking exerts a more pronounced impact on the dielectric constant than the molecular weight of the resin. In addition, the simulation results denote the excellent thermodynamic properties of the cured polymer. This study also examines the dielectric and thermodynamic properties of the resin samples that were experimentally prepared. The obtained data successfully confirm the reliability of the simulation results. This study offers novel insights for future simulation research on benzocyclobutene-based resins. Additionally, it provides theoretical support for exploring experimental work on low-dielectric materials in the electronic field.
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Affiliation(s)
- Liang Chen
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
| | - Yong Yi
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
| | - Hanming Lan
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
| | - Ji Wu
- Sichuan University of Science & Engineering, Zigong 643002, China
| | - Junxiao Yang
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
| | - Song Wu
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
| | - Wu Yang
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
| | - Ziyu Lu
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
| | - Qiuxia Peng
- Sichuan University of Science & Engineering, Zigong 643002, China
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2
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Chan YH, Lock SSM, Wong MK, Yiin CL, Loy ACM, Cheah KW, Chai SYW, Li C, How BS, Chin BLF, Chan ZP, Lam SS. A state-of-the-art review on capture and separation of hazardous hydrogen sulfide (H 2S): Recent advances, challenges and outlook. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 314:120219. [PMID: 36150621 DOI: 10.1016/j.envpol.2022.120219] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 09/12/2022] [Accepted: 09/16/2022] [Indexed: 06/16/2023]
Abstract
Hydrogen sulfide (H2S) is a flammable, corrosive and lethal gas even at low concentrations (ppm levels). Hence, the capture and removal of H2S from various emitting sources (such as oil and gas processing facilities, natural emissions, sewage treatment plants, landfills and other industrial plants) is necessary to prevent and mitigate its adverse effects on human (causing respiratory failure and asphyxiation), environment (creating highly flammable and explosive environment), and facilities (resulting in corrosion of industrial equipment and pipelines). In this review, the state-of-the-art technologies for H2S capture and removal are reviewed and discussed. In particular, the recent technologies for H2S removal such as membrane, adsorption, absorption and membrane contactor are extensively reviewed. To date, adsorption using metal oxide-based sorbents is by far the most established technology in commercial scale for the fine removal of H2S, while solvent absorption is also industrially matured for bulk removal of CO2 and H2S simultaneously. In addition, the strengths, limitations, technological gaps and way forward for each technology are also outlined. Furthermore, the comparison of established carbon capture technologies in simultaneous and selective removal of H2S-CO2 is also comprehensively discussed and presented. It was found that the existing carbon capture technologies are not adequate for the selective removal of H2S from CO2 due to their similar characteristics, and thus extensive research is still needed in this area.
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Affiliation(s)
- Yi Herng Chan
- PETRONAS Research Sdn. Bhd. (PRSB), Lot 3288 & 3289, off Jalan Ayer Itam, Kawasan Institusi Bangi, 43000, Kajang, Selangor, Malaysia
| | - Serene Sow Mun Lock
- CO(2) Research Center (CO(2)RES), Department of Chemical Engineering, Universiti Teknologi PETRONAS, 32610, Seri Iskandar, Malaysia
| | - Mee Kee Wong
- PETRONAS Research Sdn. Bhd. (PRSB), Lot 3288 & 3289, off Jalan Ayer Itam, Kawasan Institusi Bangi, 43000, Kajang, Selangor, Malaysia
| | - Chung Loong Yiin
- Department of Chemical Engineering and Energy Sustainability, Faculty of Engineering, Universiti Malaysia Sarawak (UNIMAS), 94300, Kota Samarahan, Sarawak, Malaysia; Institute of Sustainable and Renewable Energy (ISuRE), Universiti Malaysia Sarawak (UNIMAS), 94300, Kota Samarahan, Sarawak, Malaysia
| | | | - Kin Wai Cheah
- School of Computing, Engineering and Digital Technologies, Teesside University, Middlesbrough, TS1 3BX, United Kingdom
| | - Slyvester Yew Wang Chai
- Biomass Waste-to-Wealth Special Interest Group, Research Centre for Sustainable Technologies, Faculty of Engineering, Computing and Science, Swinburne University of Technology, Jalan Simpang Tiga, 93350, Kuching, Sarawak, Malaysia
| | - Claudia Li
- Department of Chemical & Biomolecular Engineering, National University of Singapore, 117585, Singapore
| | - Bing Shen How
- Biomass Waste-to-Wealth Special Interest Group, Research Centre for Sustainable Technologies, Faculty of Engineering, Computing and Science, Swinburne University of Technology, Jalan Simpang Tiga, 93350, Kuching, Sarawak, Malaysia
| | - Bridgid Lai Fui Chin
- Department of Chemical and Energy Engineering, Faculty of Engineering and Science, Curtin University Malaysia, CDT 250, 98009, Miri, Sarawak, Malaysia; Energy and Environment Research Cluster, Faculty of Engineering and Science, Curtin University Malaysia, CDT 250, 98009, Miri, Sarawak, Malaysia
| | - Zhe Phak Chan
- PETRONAS Research Sdn. Bhd. (PRSB), Lot 3288 & 3289, off Jalan Ayer Itam, Kawasan Institusi Bangi, 43000, Kajang, Selangor, Malaysia
| | - Su Shiung Lam
- Pyrolysis Technology Research Group, Higher Institution Centre of Excellence (HICoE), Institute of Tropical Aquaculture and Fisheries (AKUATROP), Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia; Henan Province Engineering Research Center for Biomass Value-added Products, School of Forestry, Henan Agricultural University, Zhengzhou, 450002, China; Sustainability Cluster, School of Engineering, University of Petroleum & Energy Studies, Dehradun, Uttarakhand, 248007, India.
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3
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Zhu S, Wang Z, Shi Y, Lai W, Zhang Y, Jin J, Jin J. Benzyl-Induced Crosslinking of Polymer Membranes for Highly Selective CO 2/CH 4 Separation with Enhanced Stability. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shouwen Zhu
- Innovation Center for Chemical Science, College of Chemistry, Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, China
| | - Zhenggong Wang
- Innovation Center for Chemical Science, College of Chemistry, Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, China
| | - Yanshu Shi
- Innovation Center for Chemical Science, College of Chemistry, Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, China
| | - Weikang Lai
- Innovation Center for Chemical Science, College of Chemistry, Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, China
| | - Yatao Zhang
- School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, China
| | - Jianyong Jin
- School of Chemical Sciences, The University of Auckland, Auckland 1010, New Zealand
| | - Jian Jin
- Innovation Center for Chemical Science, College of Chemistry, Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, China
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4
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Farnam M, bin Mukhtar H, bin Mohd Shariff A. A Review on Glassy and Rubbery Polymeric Membranes for Natural Gas Purification. CHEMBIOENG REVIEWS 2021. [DOI: 10.1002/cben.202100002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Marjan Farnam
- Polymer Engineering Division Vancouver British Columbia Canada
| | - Hilmi bin Mukhtar
- Universiti Teknologi PETRONAS Department of Chemical Engineering, Seri Iskandar 32610 Perak Darul Ridzuan Malaysia
| | - Azmi bin Mohd Shariff
- Universiti Teknologi PETRONAS Department of Chemical Engineering, Seri Iskandar 32610 Perak Darul Ridzuan Malaysia
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5
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Motallebipour MS, Karimi-Sabet J. Graphenylene and inorganic graphenylene nanopores for gas-phase 4He/ 3He separation: kinetic and steady-state considerations. Phys Chem Chem Phys 2021; 23:14706-14715. [PMID: 34190225 DOI: 10.1039/d0cp05755j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Selective membrane-based separation of light isotopes is considered to be possible based on the quantum phenomena. In this regard, the role of two mass-dependent effects, quantum tunneling and zero-point energy (ZPE), is realized to be consequential for selective separation of helium isotopes using appropriate membranes. In the present study, the efficiency of two analogous nanoporous membranes, graphenylene (GP) and inorganic graphenylene (IGP), for gas phase separation of 3He and 4He has been theoretically investigated. Since the performance of the studied membranes is extremely influenced by the close competition between both quantum tunneling and zero-point energy (ZPE) effects, high precision in the calculations is required to provide more realistic theoretical predictions. The current study attempts to provide such predictions by applying domain-based local pair natural orbital coupled cluster theory (DLPNO-CCSD) to obtain the accurate helium-pore interaction potential, based on which the tunneling rates, as well as the exact (anharmonic) bound levels for the vibration of helium in the pore plane, are calculated. From the analysis of the obtained results, the performance of the GP and IGP nanopores has been investigated in both kinetic competition and steady-state conditions in the temperature range of 10-200 K. The results of this study indicate that harmonic oscillator approximation significantly overestimates the efficiency of the studied nanopores for helium isotope separation. Based on our accurate calculations, both GP and IGP nanopores provide almost similar selectivities in kinetic competition conditions (Stot4/3 ≈ 3 at T = 50 K); however, the predicted permeance for GP (10-8 mol m-2 s-1 bar-1) is about 100 times higher than that predicted for IGP under the same conditions. Under steady-state conditions, IGP has been shown to be more efficient than GP, since it provides acceptable values of separation factor at higher temperatures.
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Affiliation(s)
- Maryam S Motallebipour
- Multiscale Multiphysics Simulation and Computational Analysis, Advanced Separation and Simulation Research Center, Tehran, Iran.
| | - Javad Karimi-Sabet
- Multiscale Multiphysics Simulation and Computational Analysis, Advanced Separation and Simulation Research Center, Tehran, Iran. and NFCRS, Nuclear Science and Technology Research Institute, Tehran, Iran
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6
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Cellulose-based carbon hollow fiber membranes for high-pressure mixed gas separations of CO2/CH4 and CO2/N2. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.117473] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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7
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Lin S, Xu M, Qu Z, Liang Y, Li Y, Cui W, Shi J, Zeng Q, Hao J, Li Y. Hidden porous boron nitride as a high-efficiency membrane for hydrogen purification. Phys Chem Chem Phys 2020; 22:22778-22784. [PMID: 33021288 DOI: 10.1039/d0cp03785k] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Nanoporous atom-thick two-dimensional materials with uniform pore size distribution and excellent mechanical strength have been considered as the ideal membranes for hydrogen purification. Here, our first-principles structure search has unravelled four porous boron nitride monolayers (m-BN, t-BN, h'-BN and h''-BN) that are metastable relative to h-BN. Especially, h'-BN consisting of B6N6 rings exhibits outstanding selectivity and permeability for hydrogen purification, higher than those of common membranes. Importantly, h'-BN possesses the mechanical strength to sustain a stress of 48 GPa, which is two orders of magnitude higher than that (0.38 GPa) of a recently reported graphene-nanomesh/single-walled carbon nanotube network hybrid membrane. The excellent selectivity, permeability and mechanical strength make h'-BN an ideal candidate for hydrogen purification.
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Affiliation(s)
- Shuyi Lin
- Laboratory of Quantum Materials Design and Application, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China.
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Garshasbi A, Chen H, Cao M, Karagöz S, Ciora RJ, Liu PK, Manousiouthakis VI, Tsotsis TT. Membrane-based reactive separations for process intensification during power generation. Catal Today 2019. [DOI: 10.1016/j.cattod.2017.10.039] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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9
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Ye H, Li D, Ye X, Zheng Y, Zhang Z, Zhang H, Chen Z. An adjustable permeation membrane up to the separation for multicomponent gas mixture. Sci Rep 2019; 9:7380. [PMID: 31089201 PMCID: PMC6517568 DOI: 10.1038/s41598-019-43751-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Accepted: 04/29/2019] [Indexed: 11/09/2022] Open
Abstract
The mixture separation is of fundamental importance in the modern industry. The membrane-based separation technology has attracted considerable attention due to the high efficiency, low energy consumption, etc. However, the tradeoff between the permeability and selectivity is a crucial challenge, which is also difficult to adjust during the separation process. Based on the salt water-filled carbon nanotubes, a separation membrane with the adjustable molecular channels by the electric field is proposed in this work. The separation mechanism is clarified on the basis of the characteristic size of the molecular channel and the overall effective diameter of gas molecules. The molecular dynamics simulation is performed to examine the feasibility and validity of the designed separation membrane. The simulations on the binary gas mixture (H2 and N2) reveal the flow control and high-purity separation as the electric field intensity varies. As for the mixed gas with the three components (H2, N2 and Xe), the successive separations and the switch between the high-efficiency and high-purity separation could be achieved only through adjusting the electric field intensity. This work incorporates the control into the membrane-based separation technology, which provides a novel solution for the complex industrial separation requirement.
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Affiliation(s)
- Hongfei Ye
- International Research Center for Computational Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian, 116024, P.R. China
| | - Dong Li
- International Research Center for Computational Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian, 116024, P.R. China
| | - Xin Ye
- International Research Center for Computational Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian, 116024, P.R. China
| | - Yonggang Zheng
- International Research Center for Computational Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian, 116024, P.R. China
| | - Zhongqiang Zhang
- Micro/Nano Science and Technology Center, Jiangsu University, Zhenjiang, 210013, P.R. China
| | - Hongwu Zhang
- International Research Center for Computational Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian, 116024, P.R. China.
| | - Zhen Chen
- International Research Center for Computational Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian, 116024, P.R. China. .,Department of Civil and Environmental Engineering, University of Missouri, Columbia, MO, 65211, USA.
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10
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Kim JY, Oh H, Moon HR. Hydrogen Isotope Separation in Confined Nanospaces: Carbons, Zeolites, Metal-Organic Frameworks, and Covalent Organic Frameworks. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1805293. [PMID: 30589123 DOI: 10.1002/adma.201805293] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Revised: 10/12/2018] [Indexed: 06/09/2023]
Abstract
One of the greatest challenges of modern separation technology is separating isotope mixtures in high purity. The separation of hydrogen isotopes can create immense economic value by producing valuable deuterium (D) and tritium (T), which are irreplaceable for various industrial and scientific applications. However, current separation methods suffer from low separation efficiency owing to the similar chemical properties of isotopes; thus, high-purity isotopes are not easily achieved. Recently, nanoporous materials have been proposed as promising candidates and are supported by a newly proposed separation mechanism, i.e., quantum effects. Herein, the fundamentals of the quantum sieving effect of hydrogen isotopes in nanoporous materials are discussed, which are mainly kinetic quantum sieving and chemical-affinity quantum sieving, including the recent advances in the analytical techniques. As examples of nanoporous materials, carbons, zeolites, metal-organic frameworks, and covalent organic frameworks are addressed from computational and experimental standpoints. Understanding the quantum sieving effect in nanospaces and the tailoring of porous materials based on it will open up new opportunities to develop a highly efficient and advanced isotope separation systems.
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Affiliation(s)
- Jin Yeong Kim
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Hyunchul Oh
- Department of Energy Engineering, Gyeongnam National University of Science and Technology, Jinju, 52725, Republic of Korea
| | - Hoi Ri Moon
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
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11
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Motallebiour MS, Karimi-Sabet J, Maghari A. 4He/3He separation using oxygen-functionalized nanoporous graphene. Phys Chem Chem Phys 2019; 21:12414-12422. [DOI: 10.1039/c9cp01364d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Various oxygen-functionalized graphene nanopores were modeled to investigate their 4He/3He separation performances under both kinetic competition and steady state conditions.
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Affiliation(s)
| | - Javad Karimi-Sabet
- Material and Nuclear Fuel Research School (MNFRS)
- Nuclear Science and Technology Research Institute
- Tehran
- Iran
| | - Ali Maghari
- Department of Chemistry
- University of Tehran
- Tehran 14176
- Iran
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12
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Shah MS, Tsapatsis M, Siepmann JI. Hydrogen Sulfide Capture: From Absorption in Polar Liquids to Oxide, Zeolite, and Metal–Organic Framework Adsorbents and Membranes. Chem Rev 2017; 117:9755-9803. [DOI: 10.1021/acs.chemrev.7b00095] [Citation(s) in RCA: 322] [Impact Index Per Article: 46.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Mansi S. Shah
- Department
of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455-0132, United States
| | - Michael Tsapatsis
- Department
of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455-0132, United States
| | - J. Ilja Siepmann
- Department
of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455-0132, United States
- Department
of Chemistry and Chemical Theory Center, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
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13
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Mi X, Shi Y. Measuring the surface diffusivity of argon in nanoporous carbon. Phys Chem Chem Phys 2017; 19:5855-5860. [PMID: 28176992 DOI: 10.1039/c6cp07819b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Gas diffusion in porous media consists of surface hopping and non-surface ballistic/bulk diffusion. Unfortunately, only the overall diffusivity is usually measured, without being separated into various diffusion modes. Here, we report a numerical method to differentiate contributions from surface diffusion and non-surface diffusion for argon diffusion in nanoporous carbon using molecular dynamics simulations. The key is to truncate the argon trajectories based on the adsorption/desorption state, and thus attribute mass fluxes according to specific mechanisms during diffusion. Both the surface diffusivity and non-surface diffusivity increase and then decrease as a function of gas loading. Yet, surface diffusivity and non-surface diffusivity behave very differently as a function of the temperature and gas-substrate affinity of the nanoporous network.
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Affiliation(s)
- Xi Mi
- Department of Material Science and Engineering, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, New York 12180, USA. and Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, New York 12180, USA
| | - Yunfeng Shi
- Department of Material Science and Engineering, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, New York 12180, USA.
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14
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Firouzi M, Sahimi M. Molecular Dynamics Simulation of Transport and Separation of Carbon Dioxide–Alkane Mixtures in a Nanoporous Membrane Under Sub- and Supercritical Conditions. Transp Porous Media 2016. [DOI: 10.1007/s11242-016-0638-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Azamat J, Khataee A, Sadikoglu F. Separation of carbon dioxide and nitrogen gases through modified boron nitride nanosheets as a membrane: insights from molecular dynamics simulations. RSC Adv 2016. [DOI: 10.1039/c6ra18396d] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The progress of gas propagating through the pores of BNNSs was simulated using MD simulations. During a simulation time of 50 ns at 298 K, there is no CO2 propagating through, meaning a high selectivity of pore 4 for CO2/N2 separation.
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Affiliation(s)
- Jafar Azamat
- Research Laboratory of Advanced Water and Wastewater Treatment Processes
- Department of Applied Chemistry
- Faculty of Chemistry
- University of Tabriz
- 51666-16471 Tabriz
| | - Alireza Khataee
- Research Laboratory of Advanced Water and Wastewater Treatment Processes
- Department of Applied Chemistry
- Faculty of Chemistry
- University of Tabriz
- 51666-16471 Tabriz
| | - Fahreddin Sadikoglu
- Department of Electrical and Electronic Engineering
- Near East University
- 99138 Nicosia
- Turkey
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16
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Naserifar S, Goddard WA, Tsotsis TT, Sahimi M. First principles-based multiparadigm, multiscale strategy for simulating complex materials processes with applications to amorphous SiC films. J Chem Phys 2015; 142:174703. [DOI: 10.1063/1.4919797] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Saber Naserifar
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089-1211, USA
- Materials and Process Simulation Center, California Institute of Technology, Pasadena, California 91125, USA
| | - William A. Goddard
- Materials and Process Simulation Center, California Institute of Technology, Pasadena, California 91125, USA
| | - Theodore T. Tsotsis
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089-1211, USA
| | - Muhammad Sahimi
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089-1211, USA
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17
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Molecular simulation study on the adsorption and separation of acidic gases in a model nanoporous carbon. Chem Eng Sci 2014. [DOI: 10.1016/j.ces.2014.07.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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18
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Field evaluation of carbon molecular sieve membranes for the separation and purification of hydrogen from coal- and biomass-derived syngas. J Memb Sci 2014. [DOI: 10.1016/j.memsci.2013.08.008] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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19
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Swaidan R, Ma X, Litwiller E, Pinnau I. High pressure pure- and mixed-gas separation of CO2/CH4 by thermally-rearranged and carbon molecular sieve membranes derived from a polyimide of intrinsic microporosity. J Memb Sci 2013. [DOI: 10.1016/j.memsci.2013.07.057] [Citation(s) in RCA: 130] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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20
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21
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Liu PKT, Sahimi M, Tsotsis TT. Process intensification in hydrogen production from coal and biomass via the use of membrane-based reactive separations. Curr Opin Chem Eng 2012. [DOI: 10.1016/j.coche.2012.06.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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22
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Liu BS, Guo YH, Yuan F. Novel Modification of a Macroporous Stainless Steel Tube by Electroless Ni plating for Use as a Substrate for Preparation of Nanoporous Carbon Membranes. Ind Eng Chem Res 2012. [DOI: 10.1021/ie202953n] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- B. S. Liu
- Department of Chemistry, School of Science, Tianjin University, Tianjin 30072, P.R. China
| | - Y. H. Guo
- Department of Chemistry, School of Science, Tianjin University, Tianjin 30072, P.R. China
| | - F. Yuan
- Department of Chemistry, School of Science, Tianjin University, Tianjin 30072, P.R. China
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23
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Lee HC, Monji M, Parsley D, Sahimi M, Liu P, Egolfopoulos F, Tsotsis T. Use of Steam Activation as a Post-treatment Technique in the Preparation of Carbon Molecular Sieve Membranes. Ind Eng Chem Res 2012. [DOI: 10.1021/ie300261r] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - Doug Parsley
- Media and Process Technology, Inc., Pittsburgh, Pennsylvania 15236, United
States
| | | | - Paul Liu
- Media and Process Technology, Inc., Pittsburgh, Pennsylvania 15236, United
States
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24
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Zhang Y, Yarin AL. Carbon nanofibers decorated with poly(furfuryl alcohol)-derived carbon nanoparticles and tetraethylorthosilicate-derived silica nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:14627-14631. [PMID: 21981576 DOI: 10.1021/la203728k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The present paper introduces a novel method to functionalize nanofiber surfaces with carbon or silica nanoparticles by dip coating. This novel approach holds promise of significant benefits because dip coating of electrospun and carbonized nanofiber mats in poly(furfuryl alcohol) (abbreviated as PFA) is used to increase surface roughness by means of PFA-derived carbon nanoparticles produced at the fiber surface. Also, dip coating in tetraethylorthosilicate (abbreviated as TEOS) is shown to be an effective method for decorating carbon nanofibers with TEOS-derived silica nanoparticles at their surface. Furthermore, dip coating is an inexpensive technique which is easier to implement than the existing methods of nanofiber decoration with silica nanoparticles and results in a higher loading capacity. Carbon nanofiber mats with PFA- or TEOS-decorated surfaces hold promise of becoming the effective electrodes in fuel cells, Li-ion batteries and storage devices.
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Affiliation(s)
- Y Zhang
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, 842 West Taylor Street, Chicago Illinois 60607-7022, USA
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25
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Billemont P, Coasne B, De Weireld G. An experimental and molecular simulation study of the adsorption of carbon dioxide and methane in nanoporous carbons in the presence of water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:1015-1024. [PMID: 21190347 DOI: 10.1021/la103107t] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The adsorption of carbon dioxide and methane in nanoporous carbons in the presence of water is studied using experiments and molecular simulations. For all amounts of adsorbed water molecules, the adsorption isotherms for carbon dioxide and methane resemble those obtained for pure fluids. The pore filling mechanism does not seem to be affected by the presence of the water molecules. Moreover, the pressure at which the maximum adsorbed amount of methane or carbon dioxide is reached is nearly insensitive to the loading of preadsorbed water molecules. In contrast, the adsorbed amount of methane or carbon dioxide decreases linearly with the number of guest water molecules. Typical molecular configurations obtained using molecular simulation indicate that the water molecules form isolated clusters within the host porous carbon due to the nonfavorable interaction between carbon dioxide or methane and water.
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Affiliation(s)
- Pierre Billemont
- Thermodynamics Department, Faculté Polytechnique, UMons, Université de Mons, 20 place du Parc, 70000 Mons, Belgium
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26
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Abdollahi M, Yu J, Liu PK, Ciora R, Sahimi M, Tsotsis TT. Hydrogen production from coal-derived syngas using a catalytic membrane reactor based process. J Memb Sci 2010. [DOI: 10.1016/j.memsci.2010.07.023] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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27
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PREPARATION AND O<SUB>2</SUB>/N<SUB>2</SUB> SEPARATION PERFORMANCE OF CARBON MOLECULAR SIEVE MEMBRANES DERIVED FROM POLY(FURFURYL ALCOHOL). ACTA POLYM SIN 2010. [DOI: 10.3724/sp.j.1105.2010.09176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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28
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29
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Malek K, Sahimi M. Molecular dynamics simulations of adsorption and diffusion of gases in silicon-carbide nanotubes. J Chem Phys 2010; 132:014310. [DOI: 10.1063/1.3284542] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
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30
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Rajabbeigi N, Elyassi B, Tsotsis TT, Sahimi M. Molecular pore-network model for nanoporous materials. I: Application to adsorption in silicon-carbide membranes. J Memb Sci 2009. [DOI: 10.1016/j.memsci.2009.02.033] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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31
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Chang KS, Hsiung CC, Lin CC, Tung KL. Residual Solvent Effects on Free Volume and Performance of Fluorinated Polyimide Membranes: A Molecular Simulation Study. J Phys Chem B 2009; 113:10159-69. [DOI: 10.1021/jp900246p] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kai-Shiun Chang
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University, Chung-Li, Taoyuan 320, Taiwan
| | - Chi-Chung Hsiung
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University, Chung-Li, Taoyuan 320, Taiwan
| | - Chih-Cheng Lin
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University, Chung-Li, Taoyuan 320, Taiwan
| | - Kuo-Lun Tung
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University, Chung-Li, Taoyuan 320, Taiwan
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32
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Anderson CJ, Pas SJ, Arora G, Kentish SE, Hill AJ, Sandler SI, Stevens GW. Effect of pyrolysis temperature and operating temperature on the performance of nanoporous carbon membranes. J Memb Sci 2008. [DOI: 10.1016/j.memsci.2008.04.064] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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33
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34
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Hwang HT, Harale A, Liu PK, Sahimi M, Tsotsis TT. A membrane-based reactive separation system for CO2 removal in a life support system. J Memb Sci 2008. [DOI: 10.1016/j.memsci.2008.02.018] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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35
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Ismail AF, Li K. From Polymeric Precursors to Hollow Fiber Carbon and Ceramic Membranes. MEMBRANE SCIENCE AND TECHNOLOGY 2008. [DOI: 10.1016/s0927-5193(07)13003-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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36
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Preparation and gas separation properties of poly(furfuryl alcohol)-based C/CMS composite membranes. Sep Purif Technol 2008. [DOI: 10.1016/j.seppur.2007.05.019] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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37
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Grainger D, Hägg MB. Evaluation of cellulose-derived carbon molecular sieve membranes for hydrogen separation from light hydrocarbons. J Memb Sci 2007. [DOI: 10.1016/j.memsci.2007.09.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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38
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Lim SY, Sahimi M, Tsotsis TT, Kim N. Molecular dynamics simulation of diffusion of gases in a carbon-nanotube-polymer composite. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2007; 76:011810. [PMID: 17677487 DOI: 10.1103/physreve.76.011810] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2006] [Revised: 04/23/2007] [Indexed: 05/16/2023]
Abstract
Extensive molecular dynamics (MD) simulations were carried out to compute the solubilities and self-diffusivities of CO2 and CH4 in amorphous polyetherimide (PEI) and mixed-matrix PEI generated by inserting single-walled carbon nanotubes into the polymer. Atomistic models of PEI and its composites were generated using energy minimizations, MD simulations, and the polymer-consistent force field. Two types of polymer composite were generated by inserting (7,0) and (12,0) zigzag carbon nanotubes into the PEI structure. The morphologies of PEI and its composites were characterized by their densities, radial distribution functions, and the accessible free volumes, which were computed with probe molecules of different sizes. The distributions of the cavity volumes were computed using the Voronoi tessellation method. The computed self-diffusivities of the gases in the polymer composites are much larger than those in pure PEI. We find, however, that the increase is not due to diffusion of the gases through the nanotubes which have smooth energy surfaces and, therefore, provide fast transport paths. Instead, the MD simulations indicate a squeezing effect of the nanotubes on the polymer matrix that changes the composite polymers' free-volume distributions and makes them more sharply peaked. The presence of nanotubes also creates several cavities with large volumes that give rise to larger diffusivities in the polymer composites. This effect is due to the repulsive interactions between the polymer and the nanotubes. The solubilities of the gases in the polymer composites are also larger than those in pure PEI, hence indicating larger gas permeabilities for mixed-matrix PEI than PEI itself.
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Affiliation(s)
- Seong Y Lim
- Mork Family Department of Chemical Engineering & Materials Science, University of Southern California, Los Angeles, California 90089-1211, USA
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39
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Molecular dynamics simulations of transport and separation of supercritical carbon dioxide-alkane mixtures in supported membranes. Chem Eng Sci 2007. [DOI: 10.1016/j.ces.2007.02.026] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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40
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Wang K, Loo LS, Haraya K. CO2 Permeation in Carbon Membranes with Different Degrees of Carbonization. Ind Eng Chem Res 2007. [DOI: 10.1021/ie060617a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kean Wang
- School of Chemical & Biomedical Engineering, Nanyang Technological University, Singapore, and National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, Tsukuba 305-8565, Japan
| | - Leslie S. Loo
- School of Chemical & Biomedical Engineering, Nanyang Technological University, Singapore, and National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, Tsukuba 305-8565, Japan
| | - K. Haraya
- School of Chemical & Biomedical Engineering, Nanyang Technological University, Singapore, and National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, Tsukuba 305-8565, Japan
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41
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Dong YR, Nishiyama N, Egashira Y, Ueyama K. H2-Selective Carbon Membranes Prepared from Furfuryl Alcohol by Vapor-Phase Synthesis. Ind Eng Chem Res 2006. [DOI: 10.1021/ie060910a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yong-Rong Dong
- Division of Chemical Engineering, Graduate school of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
| | - Norikazu Nishiyama
- Division of Chemical Engineering, Graduate school of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
| | - Yasuyuki Egashira
- Division of Chemical Engineering, Graduate school of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
| | - Korekazu Ueyama
- Division of Chemical Engineering, Graduate school of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
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42
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Tin PS, Xiao Y, Chung T. Polyimide‐Carbonized Membranes for Gas Separation: Structural, Composition, and Morphological Control of Precursors. SEPARATION AND PURIFICATION REVIEWS 2006. [DOI: 10.1080/15422110601003481] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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43
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Wang H, Yao J. Use of Poly(furfuryl alcohol) in the Fabrication of Nanostructured Carbons and Nanocomposites. Ind Eng Chem Res 2006. [DOI: 10.1021/ie0602660] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Huanting Wang
- Department of Chemical Engineering, Monash University, Clayton, VIC3800, Australia
| | - Jianfeng Yao
- Department of Chemical Engineering, Monash University, Clayton, VIC3800, Australia
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44
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45
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Non-equilibrium Molecular Dynamics Simulation on Pure Gas Permeability Through Carbon Membranes. Chin J Chem Eng 2006. [DOI: 10.1016/s1004-9541(06)60054-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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46
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Firouzi M, Sahimi M, Tsotsis TT. Supercritical fluids in porous composite materials: direction-dependent flow properties. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2006; 73:036312. [PMID: 16605656 DOI: 10.1103/physreve.73.036312] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2005] [Revised: 10/18/2005] [Indexed: 05/08/2023]
Abstract
The results of extensive nonequilibrium molecular dynamics simulations of flow and transport of a pure fluid, as well as a binary fluid mixture, through a porous material composed of a macropore, a mesopore, and a nanopore, in the presence of an external pressure gradient, are reported. We find that under supercritical conditions, unusual phenomena occur that give rise to direction-dependent and pressure-dependent permeabilities for the fluids' components. The results, which are also in agreement with a continuum formulation of the problem, indicate that the composite nature of the material, coupled with condensation, give rise to the direction-dependent permeabilities. Therefore, modeling flow and transport of fluids, in the supercritical regime, in porous materials with the type of morphology considered in this paper (such as supported porous membranes) would require using effective permeabilities that depend on both the external pressure drop and the direction along which it is applied to the materials.
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Affiliation(s)
- Mahnaz Firouzi
- Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089-1211, USA
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47
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Sedigh MG, Jahangiri M, Liu PKT, Sahimi M, Tsotsis TT. Structural characterization of polyetherimide-based carbon molecular sieve membranes. AIChE J 2006. [DOI: 10.1002/aic.690461116] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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48
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Lisal M, Brennan JK, Smith WR, Siperstein FR. Dual control cell reaction ensemble molecular dynamics: A method for simulations of reactions and adsorption in porous materials. J Chem Phys 2004; 121:4901-12. [PMID: 15332926 DOI: 10.1063/1.1782031] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present a simulation tool to study fluid mixtures that are simultaneously chemically reacting and adsorbing in a porous material. The method is a combination of the reaction ensemble Monte Carlo method and the dual control volume grand canonical molecular dynamics technique. The method, termed the dual control cell reaction ensemble molecular dynamics method, allows for the calculation of both equilibrium and nonequilibrium transport properties in porous materials such as diffusion coefficients, permeability, and mass flux. Control cells, which are in direct physical contact with the porous solid, are used to maintain the desired reaction and flow conditions for the system. The simulation setup closely mimics an actual experimental system in which the thermodynamic and flow parameters are precisely controlled. We present an application of the method to the dry reforming of methane reaction within a nanoscale reactor model in the presence of a semipermeable membrane that was modeled as a porous material similar to silicalite. We studied the effects of the membrane structure and porosity on the reaction species permeability by considering three different membrane models. We also studied the effects of an imposed pressure gradient across the membrane on the mass flux of the reaction species. Conversion of syngas (H2/CO) increased significantly in all the nanoscale membrane reactor models considered. A brief discussion of further potential applications is also presented.
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Affiliation(s)
- Martin Lisal
- E. Hála Laboratory of Thermodynamics, Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic, 165 02 Prague 6-Suchdol, Czech Republic
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49
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Firouzi M, Nezhad KM, Tsotsis TT, Sahimi M. Molecular dynamics simulations of transport and separation of carbon dioxide–alkane mixtures in carbon nanopores. J Chem Phys 2004; 120:8172-85. [PMID: 15267737 DOI: 10.1063/1.1688313] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The configurational-bias Monte Carlo method, which is used for efficient generation of molecular models of n-alkane chains, is combined for the first time with the dual control-volume grand-canonical molecular-dynamics simulation, which has been developed for studying transport of molecules in pores under an external potential gradient, to investigate transport and separation of binary mixtures of n-alkanes, as well as mixtures of CO2 and n-alkanes, in carbon nanopores. The effect of various factors, such as the temperature of the system, the composition of the mixture, and the pore size, on the separation of the mixtures is investigated. We also report the preliminary results of an experimental study of transport and separation of some of the same mixtures in a carbon molecular-sieve membrane with comparable pore sizes. The results indicate that, for the mixtures considered in this paper, even in very small carbon nanopores the energetic effects still play a dominant role in the transport and separation properties of the mixtures, whereas in a real membrane they are dominated by the membrane's morphological characteristics. As a result, for the mixtures considered, a single pore may be a grossly inadequate model of a real membrane, and hence one must resort to three-dimensional molecular pore network models of the membrane.
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Affiliation(s)
- Mahnaz Firouzi
- Department of Chemical Engineering, University of Southern California, Los Angeles, California 90089-1211, USA
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50
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ZHANG LIXIONG, GILBERT KATHERINEE, BALDWIN ROBERTM, DOUGLAS WAY J. PREPARATION AND TESTING OF CARBON/SILICALITE-1 COMPOSITE MEMBRANES. CHEM ENG COMMUN 2004. [DOI: 10.1080/00986440490275930] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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