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Liu Y, Zhou C, Chen L, Du J, Li Q, Lu C, Tan L, Huang X, Liu J, Dong L. Self-standing membranes for separation: Achievements and opportunities. Adv Colloid Interface Sci 2024; 332:103269. [PMID: 39128434 DOI: 10.1016/j.cis.2024.103269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2024] [Revised: 05/28/2024] [Accepted: 08/03/2024] [Indexed: 08/13/2024]
Abstract
Supported membranes and mixed matrix membranes have a limitation of harming the mass transfer due to the incompatibility between the support layer or the matrix and the active components of the membrane. Self-standing membranes, which could structurally abandon the support layer, altogether avoid the adverse effect, thus greatly facilitating the transmembrane mass transfer process. However, the abandonment of the support layer also reduces the membrane's mechanical properties and formability. In this review, our emphasis will be on self-standing membranes within the realm of materials and separation engineering. We will explore the materials employed in the fabrication of self-standing membranes, highlighting their ability to simultaneously enhance membrane performance and promote self-standing characteristics. Additionally, we will delve into the diverse techniques utilized for crafting self-standing membranes, encompassing interfacial polymerization, filtration, solvent casting, Langmuir-Blodgett & layer-by-layer assembly, electrospinning, compression, etc. Throughout the discussion, the merits and drawbacks associated with each of these preparation methods were elucidated. We also provide a brief overview of the applications of self-standing membranes, including water purification, gas separation, organic solvent nanofiltration, electrochemistry, and membrane reactor, as well as a brief description of the general strategies for performance enhancement of self-standing membranes. Finally, the current status of self-standing membranes and the challenges they may encounter were discussed.
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Affiliation(s)
- Yunhao Liu
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China
| | - Cailong Zhou
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China.
| | - Li Chen
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China
| | - Jingcheng Du
- Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230052, PR China
| | - Qun Li
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China
| | - Chenyang Lu
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China
| | - Luxi Tan
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China.
| | - Xiaowei Huang
- Department of Pharmacy, Quanzhou First Hospital Affiliated to Fujian Medical University, Quanzhou 362000, PR China.
| | - Jiangtao Liu
- Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230052, PR China
| | - Lichun Dong
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China
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2
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Yang S, Zhi K, Zhang Z, Kerem R, Hong Q, Zhao L, Wu W, Wang L, Wang D. Nitrogen-Rich Triazine-Based Covalent Organic Frameworks as Efficient Visible Light Photocatalysts for Hydrogen Peroxide Production. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:643. [PMID: 38607177 PMCID: PMC11013763 DOI: 10.3390/nano14070643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 04/05/2024] [Accepted: 04/06/2024] [Indexed: 04/13/2024]
Abstract
Covalent organic frameworks (COFs) have been widely used in photocatalytic hydrogen peroxide (H2O2) production due to their favorable band structure and excellent light absorption. Due to the rapid recombination rate of charge carriers, however, their applications are mainly restricted. This study presents the design and development of two highly conjugated triazine-based COFs (TBP-COF and TTP-COF) and evaluates their photocatalytic H2O2 production performance. The nitrogen-rich structures and high degrees of conjugation of TBP-COF and TTP-COF facilitate improved light absorption, promote O2 adsorption, enhance their redox power, and enable the efficient separation and transfer of photogenerated charge carriers. There is thus an increase in the photocatalytic activity for the production of H2O2. When exposed to 10 W LED visible light irradiation at a wavelength of 420 nm, the pyridine-based TTP-COF produced 4244 μmol h-1 g-1 of H2O2 from pure water in the absence of a sacrificial agent. Compared to TBP-COF (1882 μmol h-1 g-1), which has a similar structure but lacks pyridine sites, TTP-COF demonstrated nearly 2.5 times greater efficiency. Furthermore, it exhibited superior performance compared to most previously published nonmetal COF-based photocatalysts.
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Affiliation(s)
- Shu Yang
- College of Chemistry, Xinjiang University, Urumqi 830017, China; (S.Y.); (Z.Z.); (R.K.); (Q.H.); (L.Z.); (W.W.)
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, Urumqi 830017, China
| | - Keke Zhi
- College of Engineering, China University of Petroleum—Beijing at Karamay, Karamay 834000, China;
- State Key Laboratory of Heavy Oil Processing—Karamay Branch, Karamay 834000, China
| | - Zhimin Zhang
- College of Chemistry, Xinjiang University, Urumqi 830017, China; (S.Y.); (Z.Z.); (R.K.); (Q.H.); (L.Z.); (W.W.)
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, Urumqi 830017, China
| | - Rukiya Kerem
- College of Chemistry, Xinjiang University, Urumqi 830017, China; (S.Y.); (Z.Z.); (R.K.); (Q.H.); (L.Z.); (W.W.)
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, Urumqi 830017, China
| | - Qiong Hong
- College of Chemistry, Xinjiang University, Urumqi 830017, China; (S.Y.); (Z.Z.); (R.K.); (Q.H.); (L.Z.); (W.W.)
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, Urumqi 830017, China
| | - Lei Zhao
- College of Chemistry, Xinjiang University, Urumqi 830017, China; (S.Y.); (Z.Z.); (R.K.); (Q.H.); (L.Z.); (W.W.)
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, Urumqi 830017, China
| | - Wenbo Wu
- College of Chemistry, Xinjiang University, Urumqi 830017, China; (S.Y.); (Z.Z.); (R.K.); (Q.H.); (L.Z.); (W.W.)
| | - Lulu Wang
- College of Chemistry, Xinjiang University, Urumqi 830017, China; (S.Y.); (Z.Z.); (R.K.); (Q.H.); (L.Z.); (W.W.)
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, Urumqi 830017, China
| | - Duozhi Wang
- College of Chemistry, Xinjiang University, Urumqi 830017, China; (S.Y.); (Z.Z.); (R.K.); (Q.H.); (L.Z.); (W.W.)
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, Urumqi 830017, China
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3
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Wang C, Tian Y, Chen W, Lin X, Zou J, Fu D, Yu X, Qiu R, Qiu J, Zeng S. Recent Progress in Covalent Organic Frameworks for Cathode Materials. Polymers (Basel) 2024; 16:687. [PMID: 38475370 DOI: 10.3390/polym16050687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 02/23/2024] [Accepted: 02/27/2024] [Indexed: 03/14/2024] Open
Abstract
Covalent organic frameworks (COFs) are constructed from small organic molecules through reversible covalent bonds, and are therefore considered a special type of polymer. Small organic molecules are divided into nodes and connectors based on their roles in the COF's structure. The connector generally forms reversible covalent bonds with the node through two reactive end groups. The adjustment of the length of the connector facilitates the adjustment of pore size. Due to the diversity of organic small molecules and reversible covalent bonds, COFs have formed a large family since their synthesis in 2005. Among them, a type of COF containing redox active groups such as -C=O-, -C=N-, and -N=N- has received widespread attention in the field of energy storage. The ordered crystal structure of COFs ensures the ordered arrangement and consistent size of pores, which is conducive to the formation of unobstructed ion channels, giving these COFs a high-rate performance and a long cycle life. The voltage and specific capacity jointly determine the energy density of cathode materials. For the COFs' cathode materials, the voltage plateau of their active sites' VS metallic lithium is mostly between 2 and 3 V, which has great room for improvement. However, there is currently no feasible strategy for this. Therefore, previous studies mainly improved the theoretical specific capacity of the COFs' cathode materials by increasing the number of active sites. We have summarized the progress in the research on these types of COFs in recent years and found that the redox active functional groups of these COFs can be divided into six subcategories. According to the different active functional groups, these COFs are also divided into six subcategories. Here, we summarize the structure, synthesis unit, specific surface area, specific capacity, and voltage range of these cathode COFs.
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Affiliation(s)
- Chi Wang
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China
| | - Yuchao Tian
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China
| | - Wuhong Chen
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China
| | - Xiaochun Lin
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China
| | - Jizhao Zou
- Shenzhen Key Laboratory of Special Functional Materials & Shenzhen Engineering Laboratory for Advance Technology of Ceramics, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
| | - Dongju Fu
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China
| | - Xiao Yu
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China
| | - Ruling Qiu
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China
| | - Junwei Qiu
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China
| | - Shaozhong Zeng
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China
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4
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Dementyev P, Gölzhäuser A. Anti-Arrhenius passage of gaseous molecules through nanoporous two-dimensional membranes. Phys Chem Chem Phys 2024; 26:6949-6955. [PMID: 38334442 DOI: 10.1039/d3cp05705d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2024]
Abstract
The passage of molecules through membranes is known to follow an Arrhenius-like kinetics, i.e. the flux is accelerated upon heating and vice versa. There exist though stepwise processes whose rates can decrease with temperature if, for example, adsorbed intermediates are involved. In this study, we perform temperature-variable permeation experiments in the range from -50 to +50 °C and observe anti-Arrhenius behaviour of water and ammonia permeating in two-dimensional freestanding carbon nanomembranes (CNMs). The permeation rate of water vapour is found to decrease many-fold with warming, while the passage of ammonia molecules strongly increases when the membrane is cooled down to the dew point. Liquefaction of isobutylene shows no enhancement for its transmembrane flux which is consistent with the material's pore architecture. The effects are described by the Clausius-Clapeyron relationship and highlight the key role of gas-surface interactions in two-dimensional membranes.
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Affiliation(s)
- Petr Dementyev
- Physics of Supramolecular Systems and Surfaces, Bielefeld University, 33615 Bielefeld, Germany.
| | - Armin Gölzhäuser
- Physics of Supramolecular Systems and Surfaces, Bielefeld University, 33615 Bielefeld, Germany.
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5
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Qin Y, Zhu X, Huang R. Covalent organic frameworks: linkage types, synthetic methods and bio-related applications. Biomater Sci 2023; 11:6942-6976. [PMID: 37750827 DOI: 10.1039/d3bm01247f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/27/2023]
Abstract
Covalent organic frameworks (COFs) are composed of small organic molecules linked via covalent bonds, which have tunable mesoporous structure, good biocompatibility and functional diversities. These excellent properties make COFs a promising candidate for constructing biomedical nanoplatforms and provide ample opportunities for nanomedicine development. A systematic review of the linkage types and synthesis methods of COFs is of indispensable value for their biomedical applications. In this review, we first summarize the types of various linkages of COFs and their corresponding properties. Then, we highlight the reaction temperature, solvent and reaction time required by different synthesis methods and show the most suitable synthesis method by comparing the merits and demerits of various methods. To appreciate the cutting-edge research on COFs in bioscience technology, we also summarize the bio-related applications of COFs, including drug delivery, tumor therapy, bioimaging, biosensing and antimicrobial applications. We hope to provide insight into the interdisciplinary research on COFs and promote the development of COF nanomaterials for biomedical applications and their future clinical translations.
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Affiliation(s)
- Yanhui Qin
- School of Pharmacy, Key Laboratory of Smart Drug Delivery, Ministry of Education, Fudan University, Shanghai, 201203, China.
| | - Xinran Zhu
- School of Pharmacy, Key Laboratory of Smart Drug Delivery, Ministry of Education, Fudan University, Shanghai, 201203, China.
| | - Rongqin Huang
- School of Pharmacy, Key Laboratory of Smart Drug Delivery, Ministry of Education, Fudan University, Shanghai, 201203, China.
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Ding G, Zhao J, Zhou K, Zheng Q, Han ST, Peng X, Zhou Y. Porous crystalline materials for memories and neuromorphic computing systems. Chem Soc Rev 2023; 52:7071-7136. [PMID: 37755573 DOI: 10.1039/d3cs00259d] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/28/2023]
Abstract
Porous crystalline materials usually include metal-organic frameworks (MOFs), covalent organic frameworks (COFs), hydrogen-bonded organic frameworks (HOFs) and zeolites, which exhibit exceptional porosity and structural/composition designability, promoting the increasing attention in memory and neuromorphic computing systems in the last decade. From both the perspective of materials and devices, it is crucial to provide a comprehensive and timely summary of the applications of porous crystalline materials in memory and neuromorphic computing systems to guide future research endeavors. Moreover, the utilization of porous crystalline materials in electronics necessitates a shift from powder synthesis to high-quality film preparation to ensure high device performance. This review highlights the strategies for preparing porous crystalline materials films and discusses their advancements in memory and neuromorphic electronics. It also provides a detailed comparative analysis and presents the existing challenges and future research directions, which can attract the experts from various fields (e.g., materials scientists, chemists, and engineers) with the aim of promoting the applications of porous crystalline materials in memory and neuromorphic computing systems.
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Affiliation(s)
- Guanglong Ding
- Institute for Advanced Study, Shenzhen University, Shenzhen, China.
| | - JiYu Zhao
- Institute for Advanced Study, Shenzhen University, Shenzhen, China.
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Dalian University of Technology, Dalian 116024, China
- State Key Laboratory of Fine Chemicals, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
| | - Kui Zhou
- Institute for Advanced Study, Shenzhen University, Shenzhen, China.
| | - Qi Zheng
- Institute for Advanced Study, Shenzhen University, Shenzhen, China.
| | - Su-Ting Han
- College of Electronics and Information Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Xiaojun Peng
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Dalian University of Technology, Dalian 116024, China
- State Key Laboratory of Fine Chemicals, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
| | - Ye Zhou
- Institute for Advanced Study, Shenzhen University, Shenzhen, China.
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7
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Dementyev P, Khayya N, Zanders D, Ennen I, Devi A, Altman EI. Size and Shape Exclusion in 2D Silicon Dioxide Membranes. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2205602. [PMID: 36521931 DOI: 10.1002/smll.202205602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Revised: 11/25/2022] [Indexed: 06/17/2023]
Abstract
2D membranes such as artificially perforated graphene are deemed to bring great advantages for molecular separation. However, there is a lack of structure-property correlations in graphene membranes as neither the atomic configurations nor the number of introduced sub-nanometer defects are known precisely. Recently, bilayer silica has emerged as an inherent 2D membrane with an unprecedentedly high areal density of well-defined pores. Mass transfer experiments with free-standing SiO2 bilayers demonstrated a strong preference for condensable fluids over inert species, and the measured membrane selectivity revealed a key role of intermolecular forces in ångstrom-scale openings. In this study, vapor permeation measurements are combined with quantitative adsorption experiments and density functional theory (DFT) calculations to get insights into the mechanism of surface-mediated transport in vitreous 2D silicon dioxide. The membranes are shown to exhibit molecular sieving performance when exposed to vaporous methanol, ethanol, isopropanol, and tert-butanol. The results are normalized to the coverage of physisorbed molecules and agree well with the calculated energy barriers.
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Affiliation(s)
- Petr Dementyev
- Faculty of Physics, Bielefeld University, 33615, Bielefeld, Germany
| | - Neita Khayya
- Faculty of Physics, Bielefeld University, 33615, Bielefeld, Germany
| | - David Zanders
- Inorganic Materials Chemistry, Ruhr University Bochum, 44801, Bochum, Germany
| | - Inga Ennen
- Faculty of Physics, Bielefeld University, 33615, Bielefeld, Germany
| | - Anjana Devi
- Inorganic Materials Chemistry, Ruhr University Bochum, 44801, Bochum, Germany
| | - Eric I Altman
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut, 06520, USA
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8
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Yan X, Li H, Yin T, Jie G, Zhou H. Photoelectrochemical biosensing platform based on in situ generated ultrathin covalent organic framework film and AgInS 2 QDs for dual target detection of HIV and CEA. Biosens Bioelectron 2022; 217:114694. [PMID: 36113299 DOI: 10.1016/j.bios.2022.114694] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 08/27/2022] [Accepted: 09/02/2022] [Indexed: 11/02/2022]
Abstract
In this work, a new photoelectrochemical (PEC) biosensing platform based on an ordered two-dimensional (2D) ultrathin covalent organic framework (COF) film and AgInS2 quantum dots (QDs) has been developed to enable dual-target detection of HIV and CEA. The porous COF film was firstly in situ generated on ITO, displaying super-stable and intense photocurrent with excellent repeatability. Moreover, an effective PEC quenching probe was specifically designed by loading large number of AgInS2 QDs on Au nanoparticles (NPs). After target HIV-induced cyclic amplification process to generate abundant DNA S0, the Au NPs-AgInS2 QDs probe was binded to the COF film through DNA hybridization, enabling PEC signal of the COF film to turn "off" for ultra-sensitive detection of HIV. Furthermore, when CEA as the second target specifically binded to its aptamer, the Au NPs-AgInS2 QDs quenching probe was released, achieving PEC signal "on" of the T-DA COF film for ultra-sensitive detection of CEA. This work opened a unique 2-D COF film-based PEC biosensing platform with excellent signal for rapid detection of dual targets, which can effectively avoid false positives and negatives and shows promising application for early prevention and detection of cancer diseases.
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Affiliation(s)
- Xiaoshi Yan
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Hongkun Li
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Tengyue Yin
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Guifen Jie
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China.
| | - Hong Zhou
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China.
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Qi Y, Westphal M, Khayya N, Ennen I, Peters T, Cremer J, Anselmetti D, Reiss G, Hütten A, Gölzhäuser A, Dementyev P. Thickness-Varied Carbon Nanomembranes from Polycyclic Aromatic Hydrocarbons. ACS APPLIED MATERIALS & INTERFACES 2022; 14:9433-9441. [PMID: 35157431 DOI: 10.1021/acsami.1c22406] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Despite the prospects of intrinsically porous planar nanomaterials in separation applications, their synthesis on a large scale remains challenging. In particular, preparing water-selective carbon nanomembranes (CNMs) from self-assembled monolayers (SAMs) is limited by the cost of epitaxial metal substrates and molecular precursors with specific chemical functionalities. In this work, we present a facile fabrication of CNMs from polycyclic aromatic hydrocarbons (PAHs) that are drop-cast onto arbitrary supports, including foils and metalized films. The electron-induced carbonization is shown to result in continuous membranes of variable thickness, and the material is characterized with a number of spectroscopic and microscopic techniques. Permeation measurements with freestanding membranes reveal a high degree of porosity, but the selectivity is found to strongly depend on the thickness. While the permeance of helium remains almost the same for 6.5 and 3.0 nm thick CNMs, water permeance increases by 2 orders of magnitude. We rationalize the membrane performance with the help of kinetic modeling and vapor adsorption experiments.
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Affiliation(s)
- Yubo Qi
- Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Michael Westphal
- Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Neita Khayya
- Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Inga Ennen
- Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Tobias Peters
- Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Julian Cremer
- Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Dario Anselmetti
- Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Günter Reiss
- Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Andreas Hütten
- Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Armin Gölzhäuser
- Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Petr Dementyev
- Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
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10
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Naberezhnyi D, Mai L, Doudin N, Ennen I, Hütten A, Altman EI, Devi A, Dementyev P. Molecular Permeation in Freestanding Bilayer Silica. NANO LETTERS 2022; 22:1287-1293. [PMID: 35044780 DOI: 10.1021/acs.nanolett.1c04535] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Graphene and other single-layer structures are pursued as high-flux separation membranes, although imparting porosity endangers their crystalline integrity. In contrast, bilayer silica composed of corner-sharing (SiO4) units is foreseen to be permeable for small molecules due to its intrinsic lattice openings. This study sheds light on the mass transport properties of freestanding 2D SiO2 upon using atomic layer deposition (ALD) to grow large-area films on Au/mica substrates followed by transfer onto Si3N4 windows. Permeation experiments with gaseous and vaporous substances reveal the suspended material to be porous, but the membrane selectivity appears to diverge from the size exclusion principle. Whereas the passage of inert gas molecules is hindered with a permeance below 10-7 mol·s-1·m-2·Pa-1, condensable species like water are found to cross vitreous bilayer silica a thousand times faster in accordance with their superficial affinity. This work paves the way for bilayer oxides to be addressed as inherent 2D membranes.
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Affiliation(s)
| | - Lukas Mai
- Inorganic Materials Chemistry, Ruhr University Bochum, 44801 Bochum, Germany
| | - Nassar Doudin
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, United States
| | - Inga Ennen
- Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Andreas Hütten
- Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Eric I Altman
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, United States
| | - Anjana Devi
- Inorganic Materials Chemistry, Ruhr University Bochum, 44801 Bochum, Germany
| | - Petr Dementyev
- Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
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11
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Khayya N, Gölzhäuser A, Dementyev P. Surface coverage of alcohols on carbon nanomembranes under ambient conditions. Phys Chem Chem Phys 2022; 24:12563-12568. [DOI: 10.1039/d2cp00322h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular adsorption on 2D membranes plays a key role in surface-mediated permeation offering selectivity benefits for chemical separation. As many vaporous compounds are demonstrated to pass 2D membranes faster than...
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12
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Dementyev P, Khayya N, Kreie J, Gölzhäuser A. Vapor Adsorption Measurements with Two-Dimensional Membranes. Chemphyschem 2021; 23:e202100732. [PMID: 34817107 PMCID: PMC9300110 DOI: 10.1002/cphc.202100732] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 11/22/2021] [Indexed: 11/08/2022]
Abstract
Two-dimensional (2D) membranes display extraordinary mass transfer properties, in particular for the permeation of gaseous substances. Their ultimate thickness not only ensures the shortest diffusion pathways, but also makes the membrane surface play a significant role in accommodating and guiding the permeating molecules. As saturated vapors of water and organic solvents are often observed to pass 2D membranes faster than inert gases, condensation is believed to be responsible for surface-mediated transport. Here, we present a spectroscopic experiment to probe adsorption of condensable species on 2D membranes under realistic conditions. Polarization-modulation infrared reflection absorption spectroscopy (PM IRAS) is coupled with a reaction chamber and a vacuum system to control the vaporous environments. The measurements are demonstrated to yield quantitative information on the amount of adsorbates onto supported 2D layers. As a case study, the azeotropic mixture of water and propanol is revealed to maintain its molar composition upon interaction with carbon nanomembranes.
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Affiliation(s)
- Petr Dementyev
- Faculty of Physics, Bielefeld University, Universitätsstr. 25, 33615, Bielefeld, Germany
| | - Neita Khayya
- Faculty of Physics, Bielefeld University, Universitätsstr. 25, 33615, Bielefeld, Germany
| | - Jakob Kreie
- Faculty of Physics, Bielefeld University, Universitätsstr. 25, 33615, Bielefeld, Germany
| | - Armin Gölzhäuser
- Faculty of Physics, Bielefeld University, Universitätsstr. 25, 33615, Bielefeld, Germany
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