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Srivastava A, Abedrabbo S, Hassan J, Homouz D. Dynamics of confined water inside carbon nanotubes based on studying tetrahedral order parameters. Sci Rep 2024; 14:15480. [PMID: 38969700 PMCID: PMC11226439 DOI: 10.1038/s41598-024-66317-1] [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: 05/10/2024] [Accepted: 07/01/2024] [Indexed: 07/07/2024] Open
Abstract
Water dynamics inside hydrophobic confinement, such as carbon nanotubes (CNTs), has garnered significant attention, focusing on water diffusion. However, a crucial aspect remains unexplored - the influence of confinement size on water ordering and intrinsic hydrogen bond dynamics. To address this gap, we conducted extensive molecular dynamics simulations to investigate local ordering and intrinsic hydrogen bond dynamics of water molecules within CNTs of various sizes (length:20 nm, diameters: 1.0 nm to 5.0 nm) over a wide range of temperatures (260K, 280K, 300K, and 320K). A striking observation emerged: in smaller CNTs, water molecules adopt an icy structure near tube walls while maintaining liquid state towards the center. Notably, water behavior within a 2.0 nm CNT stands out as an anomaly, distinct from other CNT sizes considered in this study. This anomaly was explained through the formation of water layers inside CNTs. The hydrogen bond correlation function of water within CNTs decayed more slowly than bulk water, with an increasing rate as CNT diameter increased. In smaller CNTs, water molecules hold onto their hydrogen bond longer than larger ones. Interestingly, in larger CNTs, the innermost layer's hydrogen bond lasts a shorter time compared to the other layers, and this changes with temperature.
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Affiliation(s)
- Amit Srivastava
- Department of Physics, Khalifa University of Science and Technology, Abu Dhabi, 127788, United Arab Emirates
| | - Sufian Abedrabbo
- Department of Physics, Khalifa University of Science and Technology, Abu Dhabi, 127788, United Arab Emirates
| | - Jamal Hassan
- Department of Physics, Khalifa University of Science and Technology, Abu Dhabi, 127788, United Arab Emirates
| | - Dirar Homouz
- Department of Physics, Khalifa University of Science and Technology, Abu Dhabi, 127788, United Arab Emirates.
- Department of Physics, University of Houston, Houston, 77030-5005, TX, USA.
- Center for Theoretical Biological Physics, Rice University, Houston, 77030-1402, TX, USA.
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Srivastava A, Hassan J, Homouz D. Hydrogen Bond Dynamics and Phase Transitions of Water inside Carbon Nanotubes. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:284. [PMID: 36678038 PMCID: PMC9866512 DOI: 10.3390/nano13020284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 01/02/2023] [Accepted: 01/05/2023] [Indexed: 06/17/2023]
Abstract
Water dynamics in nanochannels are altered by confinement, particularly in small carbon nanotubes (CNTs). However, the mechanisms behind these effects remain unclear. To address these issues, we carried out extensive molecular dynamics (MD) simulations to investigate the structure and dynamics of water inside CNTs of different sizes (length of 20 nm and diameters vary from 0.8 nm to 5.0 nm) at different temperatures (from 200 K to 420 K). The radial density profile of water inside CNTs shows a single peak near the CNT walls for small nanotubes. For CNTs with larger sizes, water molecules are arranged into coaxial tubular sheets, the number of which increases with the CNT size. Subdiffusive behavior is observed for ultranarrow CNTs with diameters of 0.8 nm and 1 nm. As the size of CNTs increases, Fickian diffusion becomes evident. The hydrogen bond correlation function of water inside CNT decays slower than in bulk water, and the decay rate decreases as we increase the diameter of the CNTs. In large CNTs, the hydrogen bond lifetime of the innermost layer is shorter than the other layers and depends on temperature. Additional analysis of our results reveals that water molecules along the CNT axis show a non-Arrhenius to Arrhenius diffusion crossover. In general, the diffusion transition temperature is higher than that of bulk water, but it depends on the size of the CNT.
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Affiliation(s)
- Amit Srivastava
- Department of Physics, Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates
| | - Jamal Hassan
- Department of Physics, Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates
| | - Dirar Homouz
- Department of Physics, Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates
- Department of Physics, University of Houston, Houston, TX 77030-5005, USA
- Center for Theoretical Biological Physics, Rice University, Houston, TX 77030-1402, USA
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Cobeña-Reyes J, Sahimi M. Rheology of water in small nanotubes. Phys Rev E 2020; 102:023106. [PMID: 32942370 DOI: 10.1103/physreve.102.023106] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Accepted: 07/20/2020] [Indexed: 11/07/2022]
Abstract
The properties of water in confinement are very different from those under bulk conditions. In some cases the melting point of ice may be shifted and one may find either ice, icelike water, or a state in which freezing is completely inhibited. Understanding the dynamics and rheology of water in confined media, such as small nanotubes, is of fundamental importance to the biological properties of micro-organisms at low temperatures, to the development of new devices for preserving DNA samples, and for other biological materials and fluids, lubrication, and development of nanostructured materials. We study rheology and dynamics of water in small nanotubes using extensive equilibrium and nonequilibrium molecular dynamics simulations. The results demonstrate that in strong confinement in nanotubes at temperatures significantly below and above bulk freezing temperature water behaves as a shear-thinning fluid at shear rates smaller than the inverse of the relaxation time in the confined medium. In addition, our results indicate the presence of regions in which the local density of water varies significantly over the same range of temperature in the nanotube. These findings may also have important implications for the design of nanofluidic systems.
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Affiliation(s)
- Jose Cobeña-Reyes
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089-1211, USA
| | - M Sahimi
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089-1211, USA
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Velioğlu S, Karahan HE, Goh K, Bae TH, Chen Y, Chew JW. Metallicity-Dependent Ultrafast Water Transport in Carbon Nanotubes. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e1907575. [PMID: 32432833 DOI: 10.1002/smll.201907575] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Revised: 04/11/2020] [Accepted: 04/18/2020] [Indexed: 06/11/2023]
Abstract
Carbon nanotubes (CNTs) with hydrophobic and atomically smooth inner channels are promising for building ultrahigh-flux nanofluidic platforms for energy harvesting, health monitoring, and water purification. Conventional wisdom is that nanoconfinement effects determine water transport in CNTs. Here, using full-atomistic molecular dynamics simulations, it is shown that water transport behavior in CNTs strongly correlates with the electronic properties of single-walled CNTs (metallic (met) vs semiconducting (s/c)), which is as dominant as the effect of nanoconfinement. Three pairs of CNTs (i.e., (8,8)met , 10.85 Å vs (9,7)s/c , 10.88 Å; (9,8)s/c , 11.53 Å vs (10,7)met , 11.59 Å; and (9,9)met , 12.20 Å vs (10,8)s/c , 12.23 Å) are used to investigate the roles of diameter and metallicity. Specifically, the (9,8)s/c can restrict the hydrogen-bonding-mediated structuring of water and give the highest reduction in carbon-water interaction energy, providing an extraordinarily high water flux, around 250 times that of the commercial reverse osmosis membranes and approximately fourfold higher than the flux of the state-of-the-art boron nitrate nanotubes. Further, the high performance of (9,8)s/c is also reproducible when embedded in lipid bilayers as synthetic high-water flux porins. Given the increasing availability of high-purity CNTs, these findings provide valuable guides for realizing novel CNT-enhanced nanofluidic systems.
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Affiliation(s)
- Sadiye Velioğlu
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637459, Singapore
- Institute of Nanotechnology, Gebze Technical University, Kocaeli, 41400, Turkey
| | - Hüseyin Enis Karahan
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637459, Singapore
- Singapore Membrane Technology Center (SMTC), Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore, 637141, Singapore
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Kunli Goh
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637459, Singapore
- Singapore Membrane Technology Center (SMTC), Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore, 637141, Singapore
| | - Tae-Hyun Bae
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637459, Singapore
- Singapore Membrane Technology Center (SMTC), Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore, 637141, Singapore
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Yuan Chen
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Jia Wei Chew
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637459, Singapore
- Singapore Membrane Technology Center (SMTC), Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore, 637141, Singapore
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Russina M, Günther G, Grzimek V, Schlegel MC, Veziri CM, Karanikolos GN, Yamada T, Mezei F. Nanoscale Dynamics and Transport in Highly Ordered Low-Dimensional Water. J Phys Chem Lett 2019; 10:6339-6344. [PMID: 31577146 DOI: 10.1021/acs.jpclett.9b02303] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Highly ordered and highly cooperative water with properties of both solid and liquid states has been observed by means of neutron scattering in hydrophobic one-dimensional channels with van der Waals diameter of 0.78 nm. We have found that in the initial stages of adsorption water molecules occupy niches close to pore walls, followed later by the filling of the central pore area. Intensified by confinement, intermolecular water interactions lead to the formation of well-ordered hydrogen-bonded water chains and to the onset of cooperative vibrations. On the other hand, the same intermolecular interactions lead to two relaxation processes, the faster of which is the spontaneous position exchange between two water molecules placed 3.2-4 Å from each other. Self-diffusion in an axial pore direction is the result of those spontaneous random exchanges and is substantially slower than the self-diffusion in bulk water.
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Affiliation(s)
- Margarita Russina
- Helmholtz-Zentrum Berlin für Materialien und Energie , Hahn-Meitner-Platz 1 , 14109 Berlin , Germany
| | - Gerrit Günther
- Helmholtz-Zentrum Berlin für Materialien und Energie , Hahn-Meitner-Platz 1 , 14109 Berlin , Germany
| | - Veronika Grzimek
- Helmholtz-Zentrum Berlin für Materialien und Energie , Hahn-Meitner-Platz 1 , 14109 Berlin , Germany
| | - Moritz C Schlegel
- Helmholtz-Zentrum Berlin für Materialien und Energie , Hahn-Meitner-Platz 1 , 14109 Berlin , Germany
- Federal Institute for Materials Research and Testing , Rudower Chaussee 11 , 12489 Berlin , Germany
| | - Charitomeni M Veziri
- Institute of Nanoscience and Nanotechnology (INN) , Demokritos National Research Center , Athens , 153 10 , Greece
| | - Georgios N Karanikolos
- Department of Chemical Engineering , Khalifa University , P.O. Box 127788, Abu Dhabi , UAE
- Center for Membranes and Advanced Water Technology (CMAT) , Khalifa University , P.O. Box 127788, Abu Dhabi , UAE
| | - Takeshi Yamada
- CROSS Neutron Science and Technology Center , IQBRC Building, 162-1 Shirakata , Tokai, Naka , Ibaraki 319-1106 , Japan
| | - Ferenc Mezei
- Wigner Research Center , Pf. 49 , 1525 Budapest , Hungary
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