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Wang J, Cui Z, Li S, Song Z, He M, Huang D, Feng Y, Liu Y, Zhou K, Wang X, Wang L. Unlocking osmotic energy harvesting potential in challenging real-world hypersaline environments through vermiculite-based hetero-nanochannels. Nat Commun 2024; 15:608. [PMID: 38242879 PMCID: PMC10799064 DOI: 10.1038/s41467-023-44434-1] [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: 08/30/2023] [Accepted: 12/13/2023] [Indexed: 01/21/2024] Open
Abstract
Nanochannel membranes have demonstrated remarkable potential for osmotic energy harvesting; however, their efficiency in practical high-salinity systems is hindered by reduced ion selectivity. Here, we propose a dual-separation transport strategy by constructing a two-dimensional (2D) vermiculite (VMT)-based heterogeneous nanofluidic system via an eco-friendly and scalable method. The cations are initially separated and enriched in micropores of substrates during the transmembrane diffusion, followed by secondary precise sieving in ultra-thin VMT laminates with high ion flux. Resultantly, our nanofluidic system demonstrates efficient osmotic energy harvesting performance, especially in hypersaline environment. Notably, we achieve a maximum power density of 33.76 W m-2, a 6.2-fold improvement with a ten-fold increase in salinity gradient, surpassing state-of-the-art nanochannel membranes under challenging conditions. Additionally, we confirm practical hypersaline osmotic power generation using various natural salt-lake brines, achieving a power density of 25.9 W m-2. This work triggers the hopes for practical blue energy conversion using advanced nanoarchitecture.
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Affiliation(s)
- Jin Wang
- Research Institute of Membrane Separation Technology of Shaanxi Province, Key Laboratory of Membrane Separation of Shaanxi Province, School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, China.
| | - Zheng Cui
- Research Institute of Membrane Separation Technology of Shaanxi Province, Key Laboratory of Membrane Separation of Shaanxi Province, School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, China
| | - Shangzhen Li
- Research Institute of Membrane Separation Technology of Shaanxi Province, Key Laboratory of Membrane Separation of Shaanxi Province, School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, China
| | - Zeyuan Song
- Research Institute of Membrane Separation Technology of Shaanxi Province, Key Laboratory of Membrane Separation of Shaanxi Province, School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, China
| | - Miaolu He
- Research Institute of Membrane Separation Technology of Shaanxi Province, Key Laboratory of Membrane Separation of Shaanxi Province, School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, China
| | - Danxi Huang
- Research Institute of Membrane Separation Technology of Shaanxi Province, Key Laboratory of Membrane Separation of Shaanxi Province, School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, China
| | - Yuan Feng
- Research Institute of Membrane Separation Technology of Shaanxi Province, Key Laboratory of Membrane Separation of Shaanxi Province, School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, China
| | - YanZheng Liu
- Research Institute of Membrane Separation Technology of Shaanxi Province, Key Laboratory of Membrane Separation of Shaanxi Province, School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, China
| | - Ke Zhou
- College of Energy, Soochow Institute for Energy and Materials InnovationS (SIEMIS), Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Soochow University, Suzhou, China.
| | - Xudong Wang
- Research Institute of Membrane Separation Technology of Shaanxi Province, Key Laboratory of Membrane Separation of Shaanxi Province, School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, China
| | - Lei Wang
- Research Institute of Membrane Separation Technology of Shaanxi Province, Key Laboratory of Membrane Separation of Shaanxi Province, School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, China.
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2
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Wu J, Xie W, Tan J, Liu L. Understanding the sources of mercury release from coal: A combined experimental and molecular simulation study. JOURNAL OF HAZARDOUS MATERIALS 2023; 460:132429. [PMID: 37657318 DOI: 10.1016/j.jhazmat.2023.132429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 08/20/2023] [Accepted: 08/27/2023] [Indexed: 09/03/2023]
Abstract
Understanding the occurrence modes of mercury in coal is important as its release poses long-term adverse effects on the environment and human health during coal production and utilization. However, the matter still remains a subject of controversy due to differing results from direct and indirect analyses, which suggest various possible modes of occurrence for mercury in coal. Additionally, the experimental measurement of Hg concentration presents challenges, further contributing to the complexity of the issue. A comprehensive investigation of experiments and molecular simulations is conducted herein. Electron probe microanalysis and elemental mapping analysis show that elemental Hg is concentrated in framboidal pyrites while absent in organic matter. To understand the occurrence modes of mercury in inorganic and organic materials at the atomic level, molecular simulations are performed for Hg2+ adsorption and retention in MMT, pyrite, and kerogen slit nanopores. It is found that the inorganic MMT and pyrite surfaces have a greater adsorption capacity than the organic kerogen surface (pyrite > MMT > kerogen). The outer-sphere adsorption is mainly observed with at least one monolayer of water molecules exiting between the ion and mineral surfaces. MMT has the highest retention for Hg2+ transport as the self-diffusion coefficient is the smallest among the three slit pores (MMT < pyrite < kerogen). The high adsorption and retention originate from the strong Hg2+-mineral interaction. These results suggest that mercury in coal is most likely associated with inorganic minerals instead of organic matter.
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Affiliation(s)
- Jian Wu
- Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education, Changsha 410083, China; School of Civil Engineering, The University of Sydney, NSW 2006, Australia
| | - Wenquan Xie
- Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education, Changsha 410083, China
| | - Jingqiang Tan
- Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education, Changsha 410083, China.
| | - Lingfu Liu
- Department of Chemical Engineering, University of Wyoming, Laramie, WY 82071, USA
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3
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Gao Y, Li M, Zhan C, Zhang H, Yin M, Lu W, Xu B. A Nanoconfined Water-Ion Coordination Network for Flexible Energy-Dissipation Devices. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2303759. [PMID: 37410996 DOI: 10.1002/adma.202303759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2023] [Revised: 07/03/2023] [Accepted: 07/05/2023] [Indexed: 07/08/2023]
Abstract
Water-ion interaction in a nanoconfined environment that deeply constrains spatial freedoms of local atomistic motion with unconventional coupling mechanisms beyond that in a free, bulk state is essential to spark designs of a broad spectrum of nanofluidic devices with unique properties and functionalities. Here, it is reported that the interaction between ions and water molecules in a hydrophobic nanopore forms a coordination network with an interaction density that is nearly fourfold that of the bulk counterpart. Such strong interaction facilitates the connectivity of the water-ion network and is uncovered by corroborating the formation of ion clusters and the reduction of particle dynamics. A liquid-nanopore energy-dissipation system is designed and demonstrated in both molecular simulations and experiments that the formed coordination network controls the outflow of confined electrolytes along with a pressure reduction, capable of providing flexible protection for personnel and devices and instrumentations against external mechanical impact and attack.
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Affiliation(s)
- Yuan Gao
- State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
- Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA, 22904, USA
| | - Mingzhe Li
- Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI, 48824, USA
| | - Chi Zhan
- Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI, 48824, USA
| | - Haozhe Zhang
- Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA, 22904, USA
| | - Mengtian Yin
- Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA, 22904, USA
| | - Weiyi Lu
- Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI, 48824, USA
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI, 48824, USA
| | - Baoxing Xu
- Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA, 22904, USA
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4
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Aluru NR, Aydin F, Bazant MZ, Blankschtein D, Brozena AH, de Souza JP, Elimelech M, Faucher S, Fourkas JT, Koman VB, Kuehne M, Kulik HJ, Li HK, Li Y, Li Z, Majumdar A, Martis J, Misra RP, Noy A, Pham TA, Qu H, Rayabharam A, Reed MA, Ritt CL, Schwegler E, Siwy Z, Strano MS, Wang Y, Yao YC, Zhan C, Zhang Z. Fluids and Electrolytes under Confinement in Single-Digit Nanopores. Chem Rev 2023; 123:2737-2831. [PMID: 36898130 PMCID: PMC10037271 DOI: 10.1021/acs.chemrev.2c00155] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Abstract
Confined fluids and electrolyte solutions in nanopores exhibit rich and surprising physics and chemistry that impact the mass transport and energy efficiency in many important natural systems and industrial applications. Existing theories often fail to predict the exotic effects observed in the narrowest of such pores, called single-digit nanopores (SDNs), which have diameters or conduit widths of less than 10 nm, and have only recently become accessible for experimental measurements. What SDNs reveal has been surprising, including a rapidly increasing number of examples such as extraordinarily fast water transport, distorted fluid-phase boundaries, strong ion-correlation and quantum effects, and dielectric anomalies that are not observed in larger pores. Exploiting these effects presents myriad opportunities in both basic and applied research that stand to impact a host of new technologies at the water-energy nexus, from new membranes for precise separations and water purification to new gas permeable materials for water electrolyzers and energy-storage devices. SDNs also present unique opportunities to achieve ultrasensitive and selective chemical sensing at the single-ion and single-molecule limit. In this review article, we summarize the progress on nanofluidics of SDNs, with a focus on the confinement effects that arise in these extremely narrow nanopores. The recent development of precision model systems, transformative experimental tools, and multiscale theories that have played enabling roles in advancing this frontier are reviewed. We also identify new knowledge gaps in our understanding of nanofluidic transport and provide an outlook for the future challenges and opportunities at this rapidly advancing frontier.
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Affiliation(s)
- Narayana R Aluru
- Oden Institute for Computational Engineering and Sciences, Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, 78712TexasUnited States
| | - Fikret Aydin
- Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, Livermore, California94550, United States
| | - Martin Z Bazant
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
- Department of Mathematics, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Daniel Blankschtein
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Alexandra H Brozena
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland20742, United States
| | - J Pedro de Souza
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Menachem Elimelech
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut06520-8286, United States
| | - Samuel Faucher
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - John T Fourkas
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland20742, United States
- Institute for Physical Science and Technology, University of Maryland, College Park, Maryland20742, United States
- Maryland NanoCenter, University of Maryland, College Park, Maryland20742, United States
| | - Volodymyr B Koman
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Matthias Kuehne
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Heather J Kulik
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Hao-Kun Li
- Department of Mechanical Engineering, Stanford University, Stanford, California94305, United States
| | - Yuhao Li
- Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, Livermore, California94550, United States
| | - Zhongwu Li
- Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, Livermore, California94550, United States
| | - Arun Majumdar
- Department of Mechanical Engineering, Stanford University, Stanford, California94305, United States
| | - Joel Martis
- Department of Mechanical Engineering, Stanford University, Stanford, California94305, United States
| | - Rahul Prasanna Misra
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Aleksandr Noy
- Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, Livermore, California94550, United States
- School of Natural Sciences, University of California Merced, Merced, California95344, United States
| | - Tuan Anh Pham
- Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, Livermore, California94550, United States
| | - Haoran Qu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland20742, United States
| | - Archith Rayabharam
- Oden Institute for Computational Engineering and Sciences, Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, 78712TexasUnited States
| | - Mark A Reed
- Department of Electrical Engineering, Yale University, 15 Prospect Street, New Haven, Connecticut06520, United States
| | - Cody L Ritt
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut06520-8286, United States
| | - Eric Schwegler
- Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, Livermore, California94550, United States
| | - Zuzanna Siwy
- Department of Physics and Astronomy, Department of Chemistry, Department of Biomedical Engineering, University of California, Irvine, Irvine92697, United States
| | - Michael S Strano
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - YuHuang Wang
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland20742, United States
- Maryland NanoCenter, University of Maryland, College Park, Maryland20742, United States
| | - Yun-Chiao Yao
- Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, Livermore, California94550, United States
- School of Natural Sciences, University of California Merced, Merced, California95344, United States
| | - Cheng Zhan
- Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, Livermore, California94550, United States
| | - Ze Zhang
- Department of Mechanical Engineering, Stanford University, Stanford, California94305, United States
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5
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Zhou W, Guo Y, Zhang Z, Guo W, Qiu H. Field-Induced Hydration Shell Reorganization Enables Electro-osmotic Flow in Nanochannels. PHYSICAL REVIEW LETTERS 2023; 130:084001. [PMID: 36898090 DOI: 10.1103/physrevlett.130.084001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 10/31/2022] [Accepted: 01/17/2023] [Indexed: 06/18/2023]
Abstract
Electro-osmotic flow is the motion of fluid driven by an applied electric field, for which an electric double layer near a charged surface is deemed essential. Here, we find that electro-osmotic flow can occur in electrically neutral nanochannels in the absence of definable electric double layers through extensive molecular dynamics simulations. An applied electric field is shown to cause an intrinsic channel selectivity between cations and anions, by reorienting the hydration shells of these confined ions. The ion selectivity then results in a net charge density in the channel that induces the unconventional electro-osmotic flow. The flow direction is amenable to manipulation by the field strength and the channel size, which will inform ongoing efforts to develop highly integrated nanofluidic systems capable of complex flow control.
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Affiliation(s)
- Wanqi Zhou
- State Key Laboratory of Mechanics and Control of Mechanical Structures and Key Laboratory for Intelligent Nano Materials and Devices of MOE, Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - Yufeng Guo
- State Key Laboratory of Mechanics and Control of Mechanical Structures and Key Laboratory for Intelligent Nano Materials and Devices of MOE, Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - Zhuhua Zhang
- State Key Laboratory of Mechanics and Control of Mechanical Structures and Key Laboratory for Intelligent Nano Materials and Devices of MOE, Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - Wanlin Guo
- State Key Laboratory of Mechanics and Control of Mechanical Structures and Key Laboratory for Intelligent Nano Materials and Devices of MOE, Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - Hu Qiu
- State Key Laboratory of Mechanics and Control of Mechanical Structures and Key Laboratory for Intelligent Nano Materials and Devices of MOE, Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
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6
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H H, Mewada R, Mallajosyula SS. Capturing charge and size effects of ions at the graphene-electrolyte interface using polarizable force field simulations. NANOSCALE ADVANCES 2023; 5:796-804. [PMID: 36756506 PMCID: PMC9891073 DOI: 10.1039/d2na00733a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 12/27/2022] [Indexed: 06/18/2023]
Abstract
We present a systematic investigation capturing the charge and size effects of ions interacting with a graphene surface using polarizable simulations. Our results utilizing the Drude polarizable force field (FF) for ions, water and graphene surfaces, show that the graphene parameters previously developed by us are able to accurately capture the dynamics at the electrolyte-graphene interface. For monovalent ions, with increasing size, the solvation shell plays a crucial role in controlling the ion-graphene interactions. Smaller monovalent ions directly interact with the graphene surface, while larger ions interact with the graphene surface via a well-formed solvation shell. For divalent ions, both interaction modes are observed. For the anion Cl-, we observe direct interaction between the ions and the graphene surface. The anion-graphene interactions are strongly driven by the polarizability of the graphene surface. These effects are not captured in the absence of polarization by additive FF simulations. The present study underlines the importance of polarizability in capturing the interfacial phenomenon at the solid-solute interface.
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Affiliation(s)
- Hemanth H
- Discipline of Chemistry, Indian Institute of Technology Gandhinagar Palaj Gujarat India-382355
| | - Rohan Mewada
- Discipline of Material Science and Engineering, Indian Institute of Technology Gandhinagar Palaj Gujarat India-382355
| | - Sairam S Mallajosyula
- Discipline of Chemistry, Indian Institute of Technology Gandhinagar Palaj Gujarat India-382355
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7
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Wang Q, Qu Z, Zhang X, Chen L. Electronic-Level Insight into Interfacial Effects and Their Induced Anisotropic Ion Diffusion and Ion Selectivity in Nanochannels. ACS APPLIED MATERIALS & INTERFACES 2022; 14:37608-37619. [PMID: 35917159 DOI: 10.1021/acsami.2c06687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Osmotic energy conversion features directional ion migration in selective nanochannels, dominated by interfacial effects, temperature, and concentration. Current efforts emphasize membrane modification for superior reliability and durability, whereas the origin and implication of interfacial effects are unclear. This work performs ab initio molecular dynamics simulations for hydrated ion-graphene oxide interfaces by regulating the temperature and concentration. The interfacial effects associated with their induced anisotropic ion diffusion and ion selectivity are revealed. The scientific essence of the interfacial effects is an electron transfer triggered by hydrated ion-functional group interactions. The interfacial effects are clarified to include dynamic solvation structures, interfacial H-bonds, and chemical reactions. Ions possess incomplete hydration shells, and their arrangements vary from ordered to disordered to overlapped. Interfacial H-bonds restrict hydrated ions by constraining water molecules, whereas continuous reactions provide lateral pathways to generate anisotropy. Cation selectivity is further clarified by negative surface charges from hydroxyl deprotonation. Besides, temperature rise induces disordered hydrated ions as well as frequent and violent reactions, enhancing ion diffusion, selectivity, and anisotropy; excessive concentrations produce overlapped hydrated ions, more H-bonds, and inferior reactions, weakening ion diffusion, selectivity, and anisotropy. Finally, the bottom-up concept for osmotic energy conversion is summarized, and elevated temperature combined with low concentration is found to boost ion diffusion and ion selectivity synergistically. This work provides an in-depth understanding of interfacial phenomena and ion behaviors in nanochannels.
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Affiliation(s)
- Qiang Wang
- MOE Key Laboratory of Thermal-Fluid Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Zhiguo Qu
- MOE Key Laboratory of Thermal-Fluid Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Xu Zhang
- MOE Key Laboratory of Thermal-Fluid Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Liang Chen
- MOE Key Laboratory of Thermal-Fluid Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
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8
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Beverley KM, Shahi PK, Kabra M, Zhao Q, Heyrman J, Steffen J, Pattnaik BR. Kir7.1 disease mutant T153I within the inner pore affects K+ conduction. Am J Physiol Cell Physiol 2022; 323:C56-C68. [PMID: 35584325 DOI: 10.1152/ajpcell.00093.2022] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Inward-rectifier potassium channel 7.1 (Kir7.1) is present in polarized epithelium, including the RPE. A single amino acid change at position 153 in the KCNJ13 gene, a substitution of threonine to isoleucine in Kir7.1 protein, causes blindness. We hypothesized that the disease caused by this single amino acid substitution within the transmembrane protein domain could alter the translation, localization, or ion transport properties. We assessed the effects of amino acid side-chain length, arrangement, and polarity on channel structure and function. We showed that the T153I mutation yielded a full-length protein localized to the cell membrane. Whole-cell patch-clamp recordings and chord conductance analyses revealed that the T153I mutant channel had negligible K+ conductance and failed to hyperpolarize the membrane potential. However, the mutant channel exhibited enhanced inward current when Rb+ was used as a charge carrier, suggesting that an inner pore had formed, and the channel was dysfunctional. Substituting with a polar, non-polar, or short side-chain amino acid did not affect the localization of the protein. Still, it had an altered channel function due to differences in pore radius. Polar side chains (cysteine and serine) with inner pore radii comparable to wildtype exhibited normal inward K+ conductance. Short side-chains (glycine and alanine) produced a channel with wider than expected inner pore size and lacked the biophysical characteristics of the wildtype channel. Leucine substitution produced results similar to the T153I mutant channel. This study provides direct electrophysiological evidence for the structure and function of the Kir7.1 channel's narrow inner pore in regulating conductance.
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Affiliation(s)
- Katie M Beverley
- Endocrinology and Reproductive Physiology Graduate Program, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States.,Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States.,McPherson Eye Research Institute, University of Wisconsin, Madison, WI, United States
| | - Pawan K Shahi
- Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States.,McPherson Eye Research Institute, University of Wisconsin, Madison, WI, United States
| | - Meha Kabra
- Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States.,McPherson Eye Research Institute, University of Wisconsin, Madison, WI, United States
| | - Qianqian Zhao
- Department of Biostatistics and Medical Informatics, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States
| | - Joseph Heyrman
- Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States
| | - Jack Steffen
- Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States
| | - Bikash R Pattnaik
- Endocrinology and Reproductive Physiology Graduate Program, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States.,Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States.,McPherson Eye Research Institute, University of Wisconsin, Madison, WI, United States.,Department of Ophthalmology and Visual Sciences, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States
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9
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Tang L, Li X, Feng H, Ma C, Chang Q, Zhang J. Infiltration of salt solutions through illite particles: Effect of nanochannel size and cation type. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Zhao X, Liu Y, Lin D, Zhu W, Ma N, Xu WW, Zhao W, Sun Y, Zeng XC. Anomalous Phase Behaviors of Monolayer NaCl Aqueous Solutions Induced by Effective Coulombic Interactions within Angstrom-Scale Slits. J Phys Chem Lett 2022; 13:2704-2710. [PMID: 35302778 DOI: 10.1021/acs.jpclett.2c00501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Interests in subnanofluidic devices have called for molecular dynamics (MD) simulation studies of the thermodynamic behavior of monolayer salt solution within angstrom-scale slits. However, it still remains a grand challenge to accurately describe the Coulombic interactions by incorporating the effects of charge transfer and electronic dielectric screening. Herein, by using the electronic continuum model, where the effective ion charges are fine-tuned with a scaling factor of λ, we present simulation evidence that the effective Coulombic interactions among Na+/Cl- ions can strongly affect the behavior of monolayer ionic aqueous solution. Our microsecond-scale MD simulations show that only the counterions with moderate effective charges (0.3 ≤ λ ≤ 0.8) can dissolve in monolayer water, whereas the high effective charges (λ ≥ 0.85) induce ions to assemble into monolayer nanocrystals, and ions with the low effective charges (λ ≤ 0.2) exhibit gas-like nanobubble. These findings could provide deeper insights into the physical chemistry behind subnanofluidic iontronic devices.
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Affiliation(s)
- Xiaorong Zhao
- Department of Physics, Ningbo University, Ningbo, Zhejiang 315211, China
| | - Yuying Liu
- Department of Physics, Ningbo University, Ningbo, Zhejiang 315211, China
| | - Dongdong Lin
- Department of Physics, Ningbo University, Ningbo, Zhejiang 315211, China
| | - Weiduo Zhu
- Department of Physics, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Nan Ma
- Department of Physics, Ningbo University, Ningbo, Zhejiang 315211, China
| | - Wen Wu Xu
- Department of Physics, Ningbo University, Ningbo, Zhejiang 315211, China
| | - Wenhui Zhao
- Department of Physics, Ningbo University, Ningbo, Zhejiang 315211, China
| | - Yunxiang Sun
- Department of Physics, Ningbo University, Ningbo, Zhejiang 315211, China
| | - Xiao Cheng Zeng
- Department of Chemistry, University of Nebraska─Lincoln, Lincoln, Nebraska 68588, United States
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11
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The energetic barrier to single-file water flow through narrow channels. Biophys Rev 2022; 13:913-923. [PMID: 35035593 PMCID: PMC8724168 DOI: 10.1007/s12551-021-00875-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 10/26/2021] [Indexed: 10/30/2022] Open
Abstract
Various nanoscopic channels of roughly equal diameter and length facilitate single-file diffusion at vastly different rates. The underlying variance of the energetic barriers to transport is poorly understood. First, water partitioning into channels so narrow that individual molecules cannot overtake each other incurs an energetic penalty. Corresponding estimates vary widely depending on how the sacrifice of two out of four hydrogen bonds is accounted for. Second, entropy differences between luminal and bulk water may arise: additional degrees of freedom caused by dangling OH-bonds increase entropy. At the same time, long-range dipolar water interactions decrease entropy. Here, we dissect different contributions to Gibbs free energy of activation, ΔG ‡, for single-file water transport through narrow channels by analyzing experimental results from water permeability measurements on both bare lipid bilayers and biological water channels that (i) consider unstirred layer effects and (ii) adequately count the channels in reconstitution experiments. First, the functional relationship between water permeabilities and Arrhenius activation energies indicates negligible differences between the entropies of intraluminal water and bulk water. Second, we calculate ΔG ‡ from unitary water channel permeabilities using transition state theory. Plotting ΔG ‡ as a function of the number of H-bond donating or accepting pore-lining residues results in a 0.1 kcal/mol contribution per residue. The resulting upper limit for partial water dehydration amounts to 2 kcal/mol. In the framework of biomimicry, our analysis provides valuable insights for the design of synthetic water channels. It thus may aid in the urgent endeavor towards combating global water scarcity.
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12
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Zhang Y, Zhang Y, Pan X, Qin Y, Deng J, Wang S, Gao Q, Zhu Y, Yang Z, Lu X. Molecular insights on Ca2+/Na+ separation via graphene-based nanopores: The role of electrostatic interactions to ionic dehydration. Chin J Chem Eng 2021. [DOI: 10.1016/j.cjche.2021.10.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Zhao W, Sun Y, Zhu W, Jiang J, Zhao X, Lin D, Xu W, Duan X, Francisco JS, Zeng XC. Two-dimensional monolayer salt nanostructures can spontaneously aggregate rather than dissolve in dilute aqueous solutions. Nat Commun 2021; 12:5602. [PMID: 34556665 PMCID: PMC8460741 DOI: 10.1038/s41467-021-25938-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Accepted: 09/02/2021] [Indexed: 11/29/2022] Open
Abstract
It is well known that NaCl salt crystals can easily dissolve in dilute aqueous solutions at room temperature. Herein, we reported the first computational evidence of a novel salt nucleation behavior at room temperature, i.e., the spontaneous formation of two-dimensional (2D) alkali chloride crystalline/non-crystalline nanostructures in dilute aqueous solution under nanoscale confinement. Microsecond-scale classical molecular dynamics (MD) simulations showed that NaCl or LiCl, initially fully dissolved in confined water, can spontaneously nucleate into 2D monolayer nanostructures with either ordered or disordered morphologies. Notably, the NaCl nanostructures exhibited a 2D crystalline square-unit pattern, whereas the LiCl nanostructures adopted non-crystalline 2D hexagonal ring and/or zigzag chain patterns. These structural patterns appeared to be quite generic, regardless of the water and ion models used in the MD simulations. The generic patterns formed by 2D monolayer NaCl and LiCl nanostructures were also confirmed by ab initio MD simulations. The formation of 2D salt structures in dilute aqueous solution at room temperature is counterintuitive. Free energy calculations indicated that the unexpected spontaneous salt nucleation behavior can be attributed to the nanoscale confinement and strongly compressed hydration shells of ions. Aqueous solutions under nanoscale confinement exhibit interesting physicochemical properties. This work reports evidence on the spontaneous formation of two-dimensional alkali chloride crystalline/non-crystalline nanostructures in dilute aqueous solution under nanoscale confinement by computer simulations.
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Affiliation(s)
- Wenhui Zhao
- Department of Physics, Ningbo University, Ningbo, 315211, China
| | - Yunxiang Sun
- Department of Physics, Ningbo University, Ningbo, 315211, China
| | - Weiduo Zhu
- Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Jian Jiang
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Xiaorong Zhao
- Department of Physics, Ningbo University, Ningbo, 315211, China
| | - Dongdong Lin
- Department of Physics, Ningbo University, Ningbo, 315211, China
| | - Wenwu Xu
- Department of Physics, Ningbo University, Ningbo, 315211, China
| | - Xiangmei Duan
- Department of Physics, Ningbo University, Ningbo, 315211, China
| | - Joseph S Francisco
- Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA, 19104, USA. .,Department of Chemistry, University of Pennsylvania, Philadelphia, PA, 19104, USA.
| | - Xiao Cheng Zeng
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA. .,Department of Chemical & Biomolecular Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA.
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14
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Çam M, Lichter S, Goedde CG. Kink propagation and solute partitioning in an atomic monolayer on a substrate. Phys Rev E 2021; 104:L022801. [PMID: 34525584 DOI: 10.1103/physreve.104.l022801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Accepted: 07/29/2021] [Indexed: 11/07/2022]
Abstract
When a monolayer of Lennard-Jones atoms is driven by an external force over an atomically spaced lattice, the atoms do not move in the direction of the force. By considering monolayers containing a solvent and two different solutes, we show that the different atomic species follow distinct directions and so partition from one another and from the solvent. The strength of the driving force is chosen so that at any instant, most atoms are stationary while only a small fraction propagates as solitary waves. In this regime, the mean velocity of the layer is due to the nonzero contribution from merely a few atoms. We also present a simple theory, based on the probability that an atom in the monolayer will hop from one equilibrium location to the next, that explains the distinct directions of atomic migration.
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Affiliation(s)
- Metehan Çam
- Department of Mechanical Engineering, Northwestern University, Evanston, Illinois 60208, USA
| | - Seth Lichter
- Department of Mechanical Engineering, Northwestern University, Evanston, Illinois 60208, USA
| | - Christopher G Goedde
- Department of Physics and Astrophysics, DePaul University, Chicago, Illinois 60614, USA
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15
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Interaction-based ion selectivity exhibited by self-assembled, cross-linked zwitterionic copolymer membranes. Proc Natl Acad Sci U S A 2021; 118:2022198118. [PMID: 34493652 DOI: 10.1073/pnas.2022198118] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Water filtration membranes with advanced ion selectivity are urgently needed for resource recovery and the production of clean drinking water. This work investigates the separation capabilities of cross-linked zwitterionic copolymer membranes, a self-assembled membrane system featuring subnanometer zwitterionic nanochannels. We demonstrate that selective zwitterion-anion interactions simultaneously control salt partitioning and diffusivity, with the permeabilities of NaClO4, NaI, NaBr, NaCl, NaF, and Na2SO4 spanning roughly three orders of magnitude over a wide range of feed concentrations. We model salt flux using a one-dimensional transport model based on the Maxwell-Stefan equations and show that diffusion is the dominant mode of transport for 1:1 sodium salts. Differences in zwitterion-Cl- and zwitterion-F- interactions granted these membranes with the ultrahigh Cl-/F- permselectivity (P Cl- /P F- = 24), enabling high fluoride retention and high chloride passage even from saline mixtures of NaCl and NaF.
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16
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Ma M, Xu Z, Zhang L. Ion transport in electrolytes of dielectric nanodevices. Phys Rev E 2021; 104:035307. [PMID: 34654206 DOI: 10.1103/physreve.104.035307] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Accepted: 09/09/2021] [Indexed: 06/13/2023]
Abstract
Ion transport in electrolytes with nanoscale confinements is of great importance in many fields such as nanofluidics and electrochemical energy devices. The mobility and conductance for ions are often described by the classical Debye-Hückel-Onsager (DHO) theory but this theory fails for ions near dielectric interfaces. We propose a generalized DHO theory by using the Wentzel-Kramers-Brillouin techniques for the solution of the Onsager-Fuoss equation with variable coefficients. The theory allows to quantitatively measure physical quantities of ion transport in nanodevices and is demonstrated to well explain the abnormal increase or decrease of the ionic mobility tuned via the dielectric mismatch. By numerical calculations, our theory unravels the crucial role of the size of confinements and the ionic concentration on the ion transport, and demonstrates that the dielectric polarization can provide a giant enhancement on the conductance of electrolytes in nanodevices. This mechanism provides a practical guide for related nanoscale technologies with controllable transport properties.
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Affiliation(s)
- Manman Ma
- School of Mathematical Sciences, Tongji University, Shanghai 200092, China
| | - Zhenli Xu
- School of Mathematical Sciences, Institute of Natural Sciences, and MoE-LSC, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Liwei Zhang
- Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai 200240, China
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17
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Pelimanni E, Hautala L, Hans A, Kivimäki A, Kook M, Küstner-Wetekam C, Marder L, Patanen M, Huttula M. Core and Valence Level Photoelectron Spectroscopy of Nanosolvated KCl. J Phys Chem A 2021; 125:4750-4759. [PMID: 34034483 PMCID: PMC8279652 DOI: 10.1021/acs.jpca.1c01539] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 04/22/2021] [Indexed: 01/04/2023]
Abstract
The solvation of alkali and halide ions in the aqueous environment has been a subject of intense experimental and theoretical research with multidisciplinary interests; yet, a comprehensive molecular-level understanding has still not been obtained. In recent years, electron spectroscopy has been increasingly applied to study the electronic and structural properties of aqueous ions with implications, especially in atmospheric chemistry. In this work, we report core and valence level (Cl 2p, Cl 3p, and K 3p) photoelectron spectra of the common alkali halide, KCl, doped in gas-phase water clusters in the size range of a few hundred water molecules. The results indicate that the electronic structure of these nanosolutions shows a distinct character from that observed at the liquid-vapor interface in liquid microjets and ambient pressure setups. Insights are provided into the unique solvation properties of ions in a nanoaqueous environment, emerging properties of bulk electrolyte solutions with growing cluster size, and sensitivity of the electronic structure to varying solvation configurations.
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Affiliation(s)
- Eetu Pelimanni
- Nano
and Molecular Systems Research Unit, Faculty of Science, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland
| | - Lauri Hautala
- Nano
and Molecular Systems Research Unit, Faculty of Science, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland
| | - Andreas Hans
- Nano
and Molecular Systems Research Unit, Faculty of Science, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland
- Universität
Kassel, Institut für Physik und CINSaT, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
| | - Antti Kivimäki
- Nano
and Molecular Systems Research Unit, Faculty of Science, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland
- MAX
IV Laboratory, Lund University, P.O. Box 118, SE-22100 Lund, Sweden
| | - Mati Kook
- Institute
of Physics, University of Tartu, W. Ostwaldi 1, EE-50411 Tartu, Estonia
| | - Catmarna Küstner-Wetekam
- Universität
Kassel, Institut für Physik und CINSaT, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
| | - Lutz Marder
- Universität
Kassel, Institut für Physik und CINSaT, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
| | - Minna Patanen
- Nano
and Molecular Systems Research Unit, Faculty of Science, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland
| | - Marko Huttula
- Nano
and Molecular Systems Research Unit, Faculty of Science, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland
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18
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Watanabe R, Sakamoto T, Yamazoe K, Miyawaki J, Kato T, Harada Y. Ion Selectivity of Water Molecules in Subnanoporous Liquid-Crystalline Water-Treatment Membranes: A Structural Study of Hydrogen Bonding. Angew Chem Int Ed Engl 2020; 59:23461-23465. [PMID: 33073915 PMCID: PMC7756590 DOI: 10.1002/anie.202008148] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Indexed: 11/30/2022]
Abstract
We demonstrate hydrogen-bonded structures of water in self-organized subnanoporous water treatment membranes obtained using synchrotron-based high-resolution soft X-ray emission spectroscopy. The ion selectivity of these water treatment membranes is usually understood by the size compatibility of nanochannels in the membrane with the Stokes radius of hydrated ions, or by electrostatic interaction between charges inside the nanochannels and such ions. However, based on a comparison between the hydrogen-bonded structures of water molecules in the nanochannels of the water treatment membrane and those surrounding the ions, we propose a definite contribution of structural consistency among the associated hydrogen-bonded water molecules to the ion selectivity. Our observation delivers a novel concept to the design of water treatment membranes where water molecules in the nanochannel can be regarded as a part of the material that controls the ion selectivity.
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Affiliation(s)
- Ryusuke Watanabe
- Department of Advanced Materials ScienceGraduate School of Frontier SciencesThe University of Tokyo5-1-5, Kashiwanoha, KashiwaChiba277-8561Japan
| | - Takeshi Sakamoto
- Department of Chemistry and BiotechnologySchool of EngineeringThe University of Tokyo7-3-1, Hongo, Bunkyo-kuTokyo113-8656Japan
| | - Kosuke Yamazoe
- Institute for Solid State Physics (ISSP)The University of Tokyo5-1-5, Kashiwanoha, KashiwaChiba277-8581Japan
| | - Jun Miyawaki
- Department of Advanced Materials ScienceGraduate School of Frontier SciencesThe University of Tokyo5-1-5, Kashiwanoha, KashiwaChiba277-8561Japan
- Institute for Solid State Physics (ISSP)The University of Tokyo5-1-5, Kashiwanoha, KashiwaChiba277-8581Japan
| | - Takashi Kato
- Department of Chemistry and BiotechnologySchool of EngineeringThe University of Tokyo7-3-1, Hongo, Bunkyo-kuTokyo113-8656Japan
| | - Yoshihisa Harada
- Department of Advanced Materials ScienceGraduate School of Frontier SciencesThe University of Tokyo5-1-5, Kashiwanoha, KashiwaChiba277-8561Japan
- Institute for Solid State Physics (ISSP)The University of Tokyo5-1-5, Kashiwanoha, KashiwaChiba277-8581Japan
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19
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Watanabe R, Sakamoto T, Yamazoe K, Miyawaki J, Kato T, Harada Y. Ion Selectivity of Water Molecules in Subnanoporous Liquid‐Crystalline Water‐Treatment Membranes: A Structural Study of Hydrogen Bonding. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202008148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ryusuke Watanabe
- Department of Advanced Materials Science Graduate School of Frontier Sciences The University of Tokyo 5-1-5, Kashiwanoha, Kashiwa Chiba 277-8561 Japan
| | - Takeshi Sakamoto
- Department of Chemistry and Biotechnology School of Engineering The University of Tokyo 7-3-1, Hongo, Bunkyo-ku Tokyo 113-8656 Japan
| | - Kosuke Yamazoe
- Institute for Solid State Physics (ISSP) The University of Tokyo 5-1-5, Kashiwanoha, Kashiwa Chiba 277-8581 Japan
| | - Jun Miyawaki
- Department of Advanced Materials Science Graduate School of Frontier Sciences The University of Tokyo 5-1-5, Kashiwanoha, Kashiwa Chiba 277-8561 Japan
- Institute for Solid State Physics (ISSP) The University of Tokyo 5-1-5, Kashiwanoha, Kashiwa Chiba 277-8581 Japan
| | - Takashi Kato
- Department of Chemistry and Biotechnology School of Engineering The University of Tokyo 7-3-1, Hongo, Bunkyo-ku Tokyo 113-8656 Japan
| | - Yoshihisa Harada
- Department of Advanced Materials Science Graduate School of Frontier Sciences The University of Tokyo 5-1-5, Kashiwanoha, Kashiwa Chiba 277-8561 Japan
- Institute for Solid State Physics (ISSP) The University of Tokyo 5-1-5, Kashiwanoha, Kashiwa Chiba 277-8581 Japan
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20
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Gong K, Fang T, Wan T, Yan Y, Li W, Zhang J. Voltage-gated multilayer graphene nanochannel for K+/Na+ separation: A molecular dynamics study. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.114025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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21
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Xu J, Jiang H, Shen Y, Li XZ, Wang EG, Meng S. Transparent proton transport through a two-dimensional nanomesh material. Nat Commun 2019; 10:3971. [PMID: 31481679 PMCID: PMC6722077 DOI: 10.1038/s41467-019-11899-y] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 08/09/2019] [Indexed: 01/11/2023] Open
Abstract
Molecular sieving is of great importance to proton exchange in fuel cells, water desalination, and gas separation. Two-dimensional crystals emerge as superior materials showing desirable molecular permeability and selectivity. Here we demonstrate that a graphdiyne membrane, an experimentally fabricated member in the graphyne family, shows superior proton conductivity and perfect selectivity thanks to its intrinsic nanomesh structure. The trans-membrane hydrogen bonds across graphdiyne serve as ideal channels for proton transport in Grotthuss mechanism. The free energy barrier for proton transfer across graphdiyne is ~2.4 kJ mol-1, nearly identical to that in bulk water (2.1 kJ mol-1), enabling "transparent" proton transport at room temperature. This results in a proton conductivity of 0.6 S cm-1 for graphdiyne, four orders of magnitude greater than graphene. Considering its ultimate pore size of 0.55 nm, graphdiyne membrane blocks soluble fuel molecules and exhibits superior proton selectivity. These advantages endow graphdiyne a great potential as proton exchange material.
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Affiliation(s)
- Jiyu Xu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China
- Songshan Lake Materials Laboratory and School of Physics, Liaoning University, Dongguan, Guangdong, 523808, People's Republic of China
| | - Hongyu Jiang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China
- Songshan Lake Materials Laboratory and School of Physics, Liaoning University, Dongguan, Guangdong, 523808, People's Republic of China
| | - Yutian Shen
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China
- Songshan Lake Materials Laboratory and School of Physics, Liaoning University, Dongguan, Guangdong, 523808, People's Republic of China
| | - Xin-Zheng Li
- State Key Laboratory for Mesoscopic Physics and School of Physics, Peking University, Beijing, 100871, People's Republic of China
- Collaborative Innovation Center of Quantum Matter, Beijing, 100871, People's Republic of China
| | - E G Wang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.
- Songshan Lake Materials Laboratory and School of Physics, Liaoning University, Dongguan, Guangdong, 523808, People's Republic of China.
- State Key Laboratory for Mesoscopic Physics and School of Physics, Peking University, Beijing, 100871, People's Republic of China.
- Collaborative Innovation Center of Quantum Matter, Beijing, 100871, People's Republic of China.
| | - Sheng Meng
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China.
- Songshan Lake Materials Laboratory and School of Physics, Liaoning University, Dongguan, Guangdong, 523808, People's Republic of China.
- Collaborative Innovation Center of Quantum Matter, Beijing, 100871, People's Republic of China.
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22
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Rigo E, Dong Z, Park JH, Kennedy E, Hokmabadi M, Almonte-Garcia L, Ding L, Aluru N, Timp G. Measurements of the size and correlations between ions using an electrolytic point contact. Nat Commun 2019; 10:2382. [PMID: 31147537 PMCID: PMC6542849 DOI: 10.1038/s41467-019-10265-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Accepted: 05/01/2019] [Indexed: 01/20/2023] Open
Abstract
The size of an ion affects everything from the structure of water to life itself. In this report, to gauge their size, ions dissolved in water are forced electrically through a sub-nanometer-diameter pore spanning a thin membrane and the current is measured. The measurements reveal an ion-selective conductance that vanishes in pores <0.24 nm in diameter-the size of a water molecule-indicating that permeating ions have a grossly distorted hydration shell. Analysis of the current noise power spectral density exposes a threshold, below which the noise is independent of current, and beyond which it increases quadratically. This dependence proves that the spectral density, which is uncorrelated below threshold, becomes correlated above it. The onset of correlations for Li+, Mg2+, Na+ and K+-ions extrapolates to pore diameters of 0.13 ± 0.11 nm, 0.16 ± 0.11 nm, 0.22 ± 0.11 nm and 0.25 ± 0.11 nm, respectively-consonant with diameters at which the conductance vanishes and consistent with ions moving through the sub-nanopore with distorted hydration shells in a correlated way.
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Affiliation(s)
- Eveline Rigo
- Electrical Engineering and Biological Science, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Zhuxin Dong
- Electrical Engineering and Biological Science, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Jae Hyun Park
- Department of Aerospace and Software Engineering and Research Center for Aircraft Parts Technology, Gyeongsang National University, Jinju, Gyeongnam, 52828, Republic of Korea
| | - Eamonn Kennedy
- Electrical Engineering and Biological Science, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Mohammad Hokmabadi
- Electrical Engineering and Biological Science, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Lisa Almonte-Garcia
- Electrical Engineering and Biological Science, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Li Ding
- Electrical Engineering and Biological Science, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Narayana Aluru
- Mechanical Engineering, University of Illinois, Urbana, IL, 61801, USA
| | - Gregory Timp
- Electrical Engineering and Biological Science, University of Notre Dame, Notre Dame, IN, 46556, USA.
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23
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Sahu P, Musharaf Ali S, Shenoy KT, Mohan S. Nanoscopic insights of saline water in carbon nanotube appended filters using molecular dynamics simulations. Phys Chem Chem Phys 2019; 21:8529-8542. [PMID: 30957831 DOI: 10.1039/c9cp00648f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nanotube appended membranes are shown to be very promising due to their ultrafast water transport and very high salt rejection ability. Using classical molecular dynamics, the present study reports the nanoscopic assessment of various molecular events for nanotube-based desalination, which might be useful for nanoscale devices during process operation at the macroscopic scale. The characteristics of water and ion flow are discussed with varied strength of pressure gradient and salt concentration for different scales of confinement. The results revealed that the membranes comprising nanotubes of 1.0-1.1 nm diameter can be optimized for efficient water desalination with more than >95% salt rejection. Furthermore, the anomalies in water flux through nanotubes are linked with the hydration characteristics of ions inside CNTs. The results show the maximum hydration of confined ions inside the nanotubes, which indicated the minimum permeability of water due to freezing effects. Furthermore, the MD results revealed that akin to bulk phases, the mass transport through nanotubes can be linked with the component diffusivity in the medium. It has been demonstrated that not only the diffusivities of water and ions, but even the gradient of water to ion diffusivity might be utilized to predict and explore the experimental observations, which might be helpful in optimizing the operational regime in nanotube-based filtrations. Moreover, the thermodynamic characteristics of the flow are discussed in terms of the entropy of water and ions using the robust two-phase thermodynamic (2PT) method. The results reflect that the entropy of water is linked to the distortion of the hydrogen bond network inside the nanotube confinement, at the nanotube-water interface and at the bulk solution, whereas the entropy of ions seems to be majorly dominated by their oscillation. Also, the interconnection of hydration structure, mass flux and the diffusivity of water and ions along with their thermodynamic origin are discussed.
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Affiliation(s)
- Pooja Sahu
- Chemical Engineering Division, Bhabha Atomic Research Center, Mumbai, Maharashtra 400085, India.
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24
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Si W, Liu C, Sha J, Zhang Y, Chen Y. Computational modeling of ionic currents through difform graphene nanopores with consistent cross-sectional areas. Phys Chem Chem Phys 2019; 21:26166-26174. [DOI: 10.1039/c9cp05459f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unveiling the mystery of ion transport behavior in nanopores with consistent cross-sectional areas shows that this behavior is highly related to the geometry and hydrophobicity of the nanopores.
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Affiliation(s)
- Wei Si
- School of Mechanical Engineering
- Southeast University
- Nanjing 211189
- China
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments
| | - Chenhan Liu
- School of Mechanical Engineering
- Southeast University
- Nanjing 211189
- China
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments
| | - Jingjie Sha
- School of Mechanical Engineering
- Southeast University
- Nanjing 211189
- China
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments
| | - Yin Zhang
- School of Mechanical Engineering
- Southeast University
- Nanjing 211189
- China
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments
| | - Yunfei Chen
- School of Mechanical Engineering
- Southeast University
- Nanjing 211189
- China
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments
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25
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Wang M, Shen W, Ding S, Wang X, Wang Z, Wang Y, Liu F. A coupled effect of dehydration and electrostatic interactions on selective ion transport through charged nanochannels. NANOSCALE 2018; 10:18821-18828. [PMID: 30277244 DOI: 10.1039/c8nr04962a] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Selective ion transport is an essential feature of biological ion channels. Due to the subnanometer size and negatively charged surface of ion channels, the ion selectivity is affected by both dehydration effects and electrostatic interactions. Their coupled effect on selective ion transport, however, has been elusive. Here, using molecular dynamics simulations, we study ion (Li+ and Mg2+) transport through subnanometer carbon nanotubes (CNTs) with varying charge densities. Our results indicate that the dehydration effect governs the ionic transport at low surface charge densities, hence the nanochannel shows a selectivity for Li+ ions. In contrast, the nanochannel switches to a selectivity for Mg2+ ions as the electrostatic interaction between the cations and the negatively charged wall dominates the transport at high surface charge densities.
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Affiliation(s)
- Mao Wang
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China.
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26
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Zhou K, Xu Z. Renormalization of Ionic Solvation Shells in Nanochannels. ACS APPLIED MATERIALS & INTERFACES 2018; 10:27801-27809. [PMID: 30058329 DOI: 10.1021/acsami.8b09232] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Recently, experimental studies on selective ion transport across nanoporous membranes or through single nanochannels have unveiled interesting behaviors of dissolved ions under nanoconfinement. However, the exploration was limited by the resolution of experimental characterization. In this work, we present an atomistic simulation-based study, showing how the nanoconfinement and surface functionalization of graphene and graphene oxide nanochannels renormalize the solvation of ions (Na+, K+, Mg2+, Ca2+, Cl-). We find that the spatial distribution of dissolved ions demonstrates a layered order in nanochannels. The 1st hydration shell structures of cations are well defined in channels with width beyond ∼1.0 nm, although the rotational degree of freedom is constrained, while the 2nd hydration shells could be destructed. In the graphene oxide nanochannels, oxygen-containing functional groups can participate in the hydration shells of univalent ions but not for the divalent ions, and the valence-dependent reduction in the ionic diffusivity offers good selectivity between the divalent and univalent ions with the interlayer spacing of ∼1.0 nm, which is absent in the graphene nanochannels. With these findings, we conclude that the assessment of permeability and selectivity of ions has to take the renormalized nature of ionic solvation shells into account in the design of nanoporous membranes or nanofluidic devices for energy and environmental applications.
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Affiliation(s)
- Ke Zhou
- Applied Mechanics Laboratory, Department of Engineering Mechanics and Center for Nano and Micro Mechanics , Tsinghua University , Beijing 100084 , China
| | - Zhiping Xu
- Applied Mechanics Laboratory, Department of Engineering Mechanics and Center for Nano and Micro Mechanics , Tsinghua University , Beijing 100084 , China
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27
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Li X, Zhu C, Jia Z, Yang G. Confinement effects and mechanistic aspects for montmorillonite nanopores. J Colloid Interface Sci 2018; 523:18-26. [PMID: 29604556 DOI: 10.1016/j.jcis.2018.03.082] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 03/16/2018] [Accepted: 03/24/2018] [Indexed: 11/16/2022]
Abstract
Owing to the ubiquity, critical importance and special properties, confined microenvironments have recently triggered overwhelming interest. In this work, all-atom molecular dynamics simulations have been conducted to address the confinement effects and ion-specific effects for electrolyte solutions within montmorillonite nanopores, where the pore widths vary with a wide range. The adsorption number, structure, dynamics and stability of inner- and outer-sphere metal ions are affected by the change of pore widths (confinement effects), while the extents are significantly dependent on the type of adsorbed species. The type of adsorbed species is, however, not altered by the magnitude of confinement effects, and confinement effects are similar for different electrolyte concentrations. Ion-specific effects are pronounced for all magnitudes of confinement effects (from non- to strong confined conditions), and Hofmeister sequences of outer-sphere species are closely associated with the magnitude of confinement effects while those of inner-sphere species remain consistent. In addition, mechanistic aspects of confinement have been posed using the electrical double layer theories, and the results can be generalized to other confined systems that are ubiquitous in biology, chemistry, geology and nanotechnology.
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Affiliation(s)
- Xiong Li
- College of Resources and Environment & Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University, Chongqing 400715, China
| | - Chang Zhu
- College of Resources and Environment & Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University, Chongqing 400715, China
| | - Zengqiang Jia
- College of Resources and Environment & Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University, Chongqing 400715, China
| | - Gang Yang
- College of Resources and Environment & Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University, Chongqing 400715, China.
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28
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Chaimanatsakun A, Japrung D, Pongprayoon P. Multiscale simulation studies of geometrical effects on solution transport through nanopores. MOLECULAR SIMULATION 2018. [DOI: 10.1080/08927022.2017.1334881] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Attaphon Chaimanatsakun
- Faculty of Engineering at Sriracha, Department of Mechanical Engineering, Kasetsart University, Sriracha, Thailand
| | - Deanpen Japrung
- National Nanotechnology Center, National Science and Technology Development Agency, Pathumthani, Thailand
| | - Prapasiri Pongprayoon
- Faculty of Science, Department of Chemistry, Kasetsart University, Bangkok, Thailand
- Center for Advanced Studies in Nanotechnology for Chemical, Food and Agricultural Industries, KU Institute for Advanced Studies, Kasetsart University, Bangkok, Thailand
- Computational Biomodelling Laboratory for Agricultural Science and Technology (CBLAST), Kasetsart University, Bangkok, Thailand
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29
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Feng Y, Chen J, Fang W, Wang EG, Michaelides A, Li XZ. Hydrogenation Facilitates Proton Transfer through Two-Dimensional Honeycomb Crystals. J Phys Chem Lett 2017; 8:6009-6014. [PMID: 29185752 DOI: 10.1021/acs.jpclett.7b02820] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Recent experiments have triggered a debate about the ability of protons to transfer easily through individual layers of graphene and hexagonal boron nitride (h-BN). However, state-of-the-art computer calculations have shown that the barriers to proton penetration can, at >3 eV, be excessively high. Despite considerable interest the origin of this apparent anomaly between experiment and simulation remains unclear. We offer a new perspective on this debate and show on the basis of first-principles calculations that the barrier for proton penetration is significantly reduced, to <1 eV, upon hydrogenation, even in the absence of pinholes in the lattice. Although hydrogenation has not been offered as an explanation before, analysis reveals that the barrier is reduced because hydrogenation destabilizes the initial state (a deep-lying chemisorption state) and expands the honeycomb lattice through which the protons penetrate. This study offers a rationalization of the fast proton transfer observed in experiments and highlights the ability of proton transport through single-layer materials in hydrogen-rich solutions.
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Affiliation(s)
- Yexin Feng
- School of Physics and Electronics, Hunan University , Changsha 410082, P. R. China
| | - Ji Chen
- Thomas Young Centre, University College London , London WC1E 6BT, United Kingdom
- London Centre for Nanotechnology, University College London , London WC1E 6BT, United Kingdom
- Department of Physics and Astronomy, University College London , London WC1E 6BT, United Kingdom
| | - Wei Fang
- Thomas Young Centre, University College London , London WC1E 6BT, United Kingdom
- London Centre for Nanotechnology, University College London , London WC1E 6BT, United Kingdom
- Department of Chemistry, University College London , London WC1E 6BT, United Kingdom
| | - En-Ge Wang
- School of Physics, ICQM, and Collaborative Innovation Center of Quantum Matter, Peking University , Beijing 100871, P. R. China
| | - Angelos Michaelides
- Thomas Young Centre, University College London , London WC1E 6BT, United Kingdom
- London Centre for Nanotechnology, University College London , London WC1E 6BT, United Kingdom
- Department of Physics and Astronomy, University College London , London WC1E 6BT, United Kingdom
| | - Xin-Zheng Li
- School of Physics, ICQM, and Collaborative Innovation Center of Quantum Matter, Peking University , Beijing 100871, P. R. China
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30
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Liu X, Lu B. Incorporating Born solvation energy into the three-dimensional Poisson-Nernst-Planck model to study ion selectivity in KcsA K^{+} channels. Phys Rev E 2017; 96:062416. [PMID: 29347452 DOI: 10.1103/physreve.96.062416] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2017] [Indexed: 06/07/2023]
Abstract
Potassium channels are much more permeable to potassium than sodium ions, although potassium ions are larger and both carry the same positive charge. This puzzle cannot be solved based on the traditional Poisson-Nernst-Planck (PNP) theory of electrodiffusion because the PNP model treats all ions as point charges, does not incorporate ion size information, and therefore cannot discriminate potassium from sodium ions. The PNP model can qualitatively capture some macroscopic properties of certain channel systems such as current-voltage characteristics, conductance rectification, and inverse membrane potential. However, the traditional PNP model is a continuum mean-field model and has no or underestimates the discrete ion effects, in particular the ion solvation or self-energy (which can be described by Born model). It is known that the dehydration effect (closely related to ion size) is crucial to selective permeation in potassium channels. Therefore, we incorporated Born solvation energy into the PNP model to account for ion hydration and dehydration effects when passing through inhomogeneous dielectric channel environments. A variational approach was adopted to derive a Born-energy-modified PNP (BPNP) model. The model was applied to study a cylindrical nanopore and a realistic KcsA channel, and three-dimensional finite element simulations were performed. The BPNP model can distinguish different ion species by ion radius and predict selectivity for K^{+} over Na^{+} in KcsA channels. Furthermore, ion current rectification in the KcsA channel was observed by both the PNP and BPNP models. The I-V curve of the BPNP model for the KcsA channel indicated an inward rectifier effect for K^{+} (rectification ratio of ∼3/2) but indicated an outward rectifier effect for Na^{+} (rectification ratio of ∼1/6).
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Affiliation(s)
- Xuejiao Liu
- State Key Laboratory of Scientific and Engineering Computing, National Center for Mathematics and Interdisciplinary Sciences, Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing 100190, China and School of Mathematical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Benzhuo Lu
- State Key Laboratory of Scientific and Engineering Computing, National Center for Mathematics and Interdisciplinary Sciences, Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing 100190, China and School of Mathematical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
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31
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Luo Y, Marets N, Kato T. Selective lithium ion recognition in self-assembled columnar liquid crystals based on a lithium receptor. Chem Sci 2017; 9:608-616. [PMID: 29629125 PMCID: PMC5868304 DOI: 10.1039/c7sc03652c] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Accepted: 11/01/2017] [Indexed: 11/21/2022] Open
Abstract
Lithium is recognized as being significantly important due to its various applications in different areas especially in energy technology. In the present study, self-assembled nanostructured liquid-crystalline (LC) materials, that selectively bind lithium cations, have been developed for the first time. Wedge-shaped crown ether derivatives bearing dibenzo-14-crown-4 (DB14C4) or 12-crown-4 moieties are able to act as LC lithium-selective receptors. We have found that complexation of these receptors with lithium perchlorate induces liquid-crystalline columnar phases, while sodium perchlorate is immiscible with both receptors. Remarkably, a receptor consisting of DB14C4 as an effective lithium-selective ligand exhibits high selectivity for LiCl over NaCl, KCl, RbCl and CsCl. The lithium selectivity was demonstrated and investigated by 1H NMR, 1H COSY and FT-IR spectroscopic measurements. The preferred coordination number of four and the ideal cavity geometry of the DB14C4 moiety of the receptor are shown to be key factors for the high lithium selectivity. This new design of LC lithium-selective receptors opens unexplored paths for the development of methods to fabricate nanostructured materials for efficient selective lithium recognition.
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Affiliation(s)
- Yuan Luo
- Department of Chemistry and Biotechnology , School of Engineering , The University of Tokyo , Hongo, Bunkyo-ku , Tokyo 113-8656 , Japan .
| | - Nicolas Marets
- Department of Chemistry and Biotechnology , School of Engineering , The University of Tokyo , Hongo, Bunkyo-ku , Tokyo 113-8656 , Japan .
| | - Takashi Kato
- Department of Chemistry and Biotechnology , School of Engineering , The University of Tokyo , Hongo, Bunkyo-ku , Tokyo 113-8656 , Japan .
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32
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Brini E, Fennell CJ, Fernandez-Serra M, Hribar-Lee B, Lukšič M, Dill KA. How Water's Properties Are Encoded in Its Molecular Structure and Energies. Chem Rev 2017; 117:12385-12414. [PMID: 28949513 PMCID: PMC5639468 DOI: 10.1021/acs.chemrev.7b00259] [Citation(s) in RCA: 185] [Impact Index Per Article: 26.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Indexed: 11/29/2022]
Abstract
How are water's material properties encoded within the structure of the water molecule? This is pertinent to understanding Earth's living systems, its materials, its geochemistry and geophysics, and a broad spectrum of its industrial chemistry. Water has distinctive liquid and solid properties: It is highly cohesive. It has volumetric anomalies-water's solid (ice) floats on its liquid; pressure can melt the solid rather than freezing the liquid; heating can shrink the liquid. It has more solid phases than other materials. Its supercooled liquid has divergent thermodynamic response functions. Its glassy state is neither fragile nor strong. Its component ions-hydroxide and protons-diffuse much faster than other ions. Aqueous solvation of ions or oils entails large entropies and heat capacities. We review how these properties are encoded within water's molecular structure and energies, as understood from theories, simulations, and experiments. Like simpler liquids, water molecules are nearly spherical and interact with each other through van der Waals forces. Unlike simpler liquids, water's orientation-dependent hydrogen bonding leads to open tetrahedral cage-like structuring that contributes to its remarkable volumetric and thermal properties.
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Affiliation(s)
- Emiliano Brini
- Laufer
Center for Physical and Quantitative Biology, Department of Physics and Astronomy, and Department of
Chemistry, Stony Brook University, Stony Brook, New York 11794, United States
| | - Christopher J. Fennell
- Department
of Chemistry, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Marivi Fernandez-Serra
- Laufer
Center for Physical and Quantitative Biology, Department of Physics and Astronomy, and Department of
Chemistry, Stony Brook University, Stony Brook, New York 11794, United States
| | - Barbara Hribar-Lee
- Faculty
of Chemistry and Chemical Technology, University
of Ljubljana, Večna
pot 113, SI-1000 Ljubljana, Slovenia
| | - Miha Lukšič
- Faculty
of Chemistry and Chemical Technology, University
of Ljubljana, Večna
pot 113, SI-1000 Ljubljana, Slovenia
| | - Ken A. Dill
- Laufer
Center for Physical and Quantitative Biology, Department of Physics and Astronomy, and Department of
Chemistry, Stony Brook University, Stony Brook, New York 11794, United States
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33
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Zhu Y, Ruan Y, Zhang Y, Chen Y, Lu X, Lu L. Mg 2+-Channel-Inspired Nanopores for Mg 2+/Li + Separation: The Effect of Coordination on the Ionic Hydration Microstructures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:9201-9210. [PMID: 28803477 DOI: 10.1021/acs.langmuir.7b01249] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The separation behaviors of Mg2+ and Li+ were investigated using molecular dynamics. Two functionalized graphene nanopore models (i.e., co_5 and coo_5) inspired by the characteristic structural features of Mg2+ channels were used. Both nanopores exhibited a higher preference to Mg2+ than to Li+, and the selectivity ratios were higher for coo_5 than for co_5 under all the studied transmembrane voltages. An evaluation of the effect of coordination on the ionic hydration microstructures for both nanopores showed that the positioning of the modified groups could better fit a hydrated Mg2+ than a hydrated Li+, as if Mg2+ was not dehydrated according to hydrogen bond analysis of the ionic hydration shells. This condition led to a lower resistance for Mg2+ than for Li+ when traveling through the nanopores. Moreover, a distinct increase in hydrogen bonds occurred with coo_5 compared with co_5 for hydrated Li+, which made it more difficult for Li+ to pass through coo_5. Thus, a higher Mg2+/Li+ selectivity was found in for coo_5 than for co_5. These findings provide some design principles for developing artificial Mg2+ channels, which have potential applications as Mg2+ sensors and novel devices for Mg2+/Li+ separation.
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Affiliation(s)
- Yudan Zhu
- College of Chemical Engineering, State Key Laboratory of Materials-oriented Chemical Engineering, Nanjing Tech University , Nanjing 210009, P.R. China
| | - Yang Ruan
- College of Chemical Engineering, State Key Laboratory of Materials-oriented Chemical Engineering, Nanjing Tech University , Nanjing 210009, P.R. China
| | - Yumeng Zhang
- College of Chemical Engineering, State Key Laboratory of Materials-oriented Chemical Engineering, Nanjing Tech University , Nanjing 210009, P.R. China
| | - Yaojia Chen
- College of Chemical Engineering, State Key Laboratory of Materials-oriented Chemical Engineering, Nanjing Tech University , Nanjing 210009, P.R. China
| | - Xiaohua Lu
- College of Chemical Engineering, State Key Laboratory of Materials-oriented Chemical Engineering, Nanjing Tech University , Nanjing 210009, P.R. China
| | - Linghong Lu
- College of Chemical Engineering, State Key Laboratory of Materials-oriented Chemical Engineering, Nanjing Tech University , Nanjing 210009, P.R. China
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Lee C, Guo J, Zeng W, Kim S, She J, Cang C, Ren D, Jiang Y. The lysosomal potassium channel TMEM175 adopts a novel tetrameric architecture. Nature 2017; 547:472-475. [PMID: 28723891 PMCID: PMC5901963 DOI: 10.1038/nature23269] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 06/06/2017] [Indexed: 11/09/2022]
Abstract
TMEM175 is a lysosomal K+ channel that is important for maintaining the membrane potential and pH stability in lysosomes. It contains two homologous copies of a six-transmembrane-helix (6-TM) domain, which has no sequence homology to the canonical tetrameric K+ channels and lacks the TVGYG selectivity filter motif found in these channels. The prokaryotic TMEM175 channel, which is present in a subset of bacteria and archaea, contains only a single 6-TM domain and functions as a tetramer. Here, we present the crystal structure of a prokaryotic TMEM175 channel from Chamaesiphon minutus, CmTMEM175, the architecture of which represents a completely different fold from that of canonical K+ channels. All six transmembrane helices of CmTMEM175 are tightly packed within each subunit without undergoing domain swapping. The highly conserved TM1 helix acts as the pore-lining inner helix, creating an hourglass-shaped ion permeation pathway in the channel tetramer. Three layers of hydrophobic residues on the carboxy-terminal half of the TM1 helices form a bottleneck along the ion conduction pathway and serve as the selectivity filter of the channel. Mutagenesis analysis suggests that the first layer of the highly conserved isoleucine residues in the filter is primarily responsible for channel selectivity. Thus, the structure of CmTMEM175 represents a novel architecture of a tetrameric cation channel whose ion selectivity mechanism appears to be distinct from that of the classical K+ channel family.
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Affiliation(s)
- Changkeun Lee
- Department of Physiology and Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9040, USA.,Howard Hughes Medical Institute, Chevy Chase, Maryland 20815-6789, USA
| | - Jiangtao Guo
- Department of Physiology and Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9040, USA
| | - Weizhong Zeng
- Department of Physiology and Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9040, USA.,Howard Hughes Medical Institute, Chevy Chase, Maryland 20815-6789, USA
| | - Sunghoon Kim
- Department of Physiology and Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9040, USA.,Howard Hughes Medical Institute, Chevy Chase, Maryland 20815-6789, USA
| | - Ji She
- Department of Physiology and Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9040, USA
| | - Chunlei Cang
- Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Dejian Ren
- Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Youxing Jiang
- Department of Physiology and Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9040, USA.,Howard Hughes Medical Institute, Chevy Chase, Maryland 20815-6789, USA
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35
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Striolo A, Michaelides A, Joly L. The Carbon-Water Interface: Modeling Challenges and Opportunities for the Water-Energy Nexus. Annu Rev Chem Biomol Eng 2016; 7:533-56. [DOI: 10.1146/annurev-chembioeng-080615-034455] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Providing clean water and sufficient affordable energy to all without compromising the environment is a key priority in the scientific community. Many recent studies have focused on carbon-based devices in the hope of addressing this grand challenge, justifying and motivating detailed studies of water in contact with carbonaceous materials. Such studies are becoming increasingly important because of the miniaturization of newly proposed devices, with ubiquitous nanopores, large surface-to-volume ratio, and many, perhaps most of the water molecules in contact with a carbon-based surface. In this brief review, we discuss some recent advances obtained via simulations and experiments in the development of carbon-based materials for applications in water desalination. We suggest possible ways forward, with particular emphasis on the synergistic combination of experiments and simulations, with simulations now sometimes offering sufficient accuracy to provide fundamental insights. We also point the interested reader to recent works that complement our short summary on the state of the art of this important and fascinating field.
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Affiliation(s)
- Alberto Striolo
- Department of Chemical Engineering, University College London, London WC1E 7JE, United Kingdom
| | - Angelos Michaelides
- Thomas Young Centre, London Centre for Nanotechnology, and Department of Physics and Astronomy, University College London, London WC1H 0AH, United Kingdom
| | - Laurent Joly
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, France
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36
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Xiao K, Wen L, Jiang L. Biomimetic Solid-State Nanochannels: From Fundamental Research to Practical Applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:2810-2831. [PMID: 27040151 DOI: 10.1002/smll.201600359] [Citation(s) in RCA: 109] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 02/25/2016] [Indexed: 06/05/2023]
Abstract
In recent years, solid-state smart nanopores/nanochannels for intelligent control of the transportation of ions and molecules as organisms have been extensively studied, because they hold great potential applications in molecular sieves, nanofluidics, energy conversion, and biosensors. To keep up with the fast development of this field, it is necessary to summarize the construction, characterization, and application of biomimetic smart nanopores/nanochannels. These can be classified into four sections: the fabrication of solid-state nanopores/nanochannels, the functionalization methods and materials, the mechanism explanation about the ion rectification, and the practical applications. A brief conclusion and outlook for the biomimetic nanochannels is provided, highlighting those that could be developed and integrated into devices for use in tackling current and the future problems including resources, energy, environment, and health.
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Affiliation(s)
- Kai Xiao
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | - Liping Wen
- Laboratory of Bioinspired Smart Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | - Lei Jiang
- Laboratory of Bioinspired Smart Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
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37
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Barboiu M. Artificial water channels – incipient innovative developments. Chem Commun (Camb) 2016; 52:5657-65. [DOI: 10.1039/c6cc01724j] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
This Feature Article discusses the incipient developments of the first artificial water channels, including only systems that integrate synthetic elements in their water selective translocation unit.
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Affiliation(s)
- Mihail Barboiu
- Institut Européen des Membranes
- Adaptive Supramolecular Nanosystems Group
- Place Eugène Bataillon
- CC 047
- F-34095 Montpellier
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38
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Finnerty JJ, Peyser A, Carloni P. Cation Selectivity in Biological Cation Channels Using Experimental Structural Information and Statistical Mechanical Simulation. PLoS One 2015; 10:e0138679. [PMID: 26460827 PMCID: PMC4603898 DOI: 10.1371/journal.pone.0138679] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 09/01/2015] [Indexed: 01/31/2023] Open
Abstract
Cation selective channels constitute the gate for ion currents through the cell membrane. Here we present an improved statistical mechanical model based on atomistic structural information, cation hydration state and without tuned parameters that reproduces the selectivity of biological Na+ and Ca2+ ion channels. The importance of the inclusion of step-wise cation hydration in these results confirms the essential role partial dehydration plays in the bacterial Na+ channels. The model, proven reliable against experimental data, could be straightforwardly used for designing Na+ and Ca2+ selective nanopores.
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Affiliation(s)
- Justin John Finnerty
- Computational Biophysics, German Research School for Simulation Sciences, 52425 Jülich, Germany
| | - Alexander Peyser
- Computational Biophysics, German Research School for Simulation Sciences, 52425 Jülich, Germany
- Simulation Lab Neuroscience—Bernstein Facility for Simulation and Database Technology, Institute for Advanced Simulation, Jülich Aachen Research Alliance, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Paolo Carloni
- Computational Biophysics, German Research School for Simulation Sciences, 52425 Jülich, Germany
- Computational Biomedicine, Institute for Neuroscience and Medicine (INM-9) and Institute for Advanced Simulation (IAS-5), Forschungszentrum Jülich, 52425 Jülich, Germany
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