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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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Tran TH, Phan GTT, Luc HT, Nguyen PT, Hoang H. Molecular dynamics simulations on aqueous solution confined in charged nanochannels: asymmetric effect of surface charge. MOLECULAR SIMULATION 2020. [DOI: 10.1080/08927022.2020.1773459] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Thi Ha Tran
- Laboratory of Advanced Materials Chemistry, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam
- Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam
| | - Giang T. T. Phan
- Institute of Fundamental and Applied Sciences, Duy Tan University, Vietnam
- Faculty of Natural Sciences, Duy Tan University, Danang, Vietnam
| | - Han Tuong Luc
- Institute of Fundamental and Applied Sciences, Duy Tan University, Vietnam
- Faculty of Natural Sciences, Duy Tan University, Danang, Vietnam
| | - Phuoc The Nguyen
- Faculty of Natural Sciences, Duy Tan University, Danang, Vietnam
| | - Hai Hoang
- Institute of Fundamental and Applied Sciences, Duy Tan University, Vietnam
- Faculty of Natural Sciences, Duy Tan University, Danang, Vietnam
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Ho TA, Wang Y. Enhancement of oil flow in shale nanopores by manipulating friction and viscosity. Phys Chem Chem Phys 2019; 21:12777-12786. [PMID: 31120076 DOI: 10.1039/c9cp01960j] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Understanding the viscosity and friction of a fluid under nanoconfinement is the key to nanofluidics research. Existing work on nanochannel flow enhancement has been focused on simple systems with only one to two fluids considered such as water flow in carbon nanotubes, and large slip lengths have been found to be the main factor for the massive flow enhancement. In this study, we use molecular dynamics simulations to study the fluid flow of a ternary mixture of octane-carbon dioxide-water confined within two muscovite and kerogen surfaces. The results indicate that, in a muscovite slit, supercritical CO2 (scCO2) and H2O both enhance the flow of octane due to (i) a decrease in the friction of octane with the muscovite wall because of the formation of thin layers of H2O and scCO2 near the surfaces; and (ii) a reduction in the viscosity of octane in nanoconfinement. Water reduces octane viscosity by weakening the interaction of octane with the muscovite surface, while scCO2 reduces octane viscosity by weakening both octane-octane and octane-surface interactions. In a kerogen slit, water does not play any significant role in changing the friction or viscosity of octane. In contrast, scCO2 reduces both the friction and the viscosity of octane, and the enhancement of octane flow is mainly caused by the reduction of viscosity. Our results highlight the importance of multicomponent interactions in nanoscale fluid transport. The results presented here also have a direct implication in enhanced oil recovery in unconventional reservoirs.
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Affiliation(s)
- Tuan A Ho
- Geochemistry Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.
| | - Yifeng Wang
- Nuclear Waste Disposal Research and Analysis Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
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Ho TA, Striolo A. Water and methane in shale rocks: Flow pattern effects on fluid transport and pore structure. AIChE J 2015. [DOI: 10.1002/aic.14869] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Tuan A. Ho
- Dept. of Chemical Engineering; University College London; Torrington Place London WC1E 7JE U.K
| | - Alberto Striolo
- Dept. of Chemical Engineering; University College London; Torrington Place London WC1E 7JE U.K
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Agnihotri MV, Chen SH, Beck C, Singer SJ. Displacements, Mean-Squared Displacements, and Codisplacements for the Calculation of Nonequilibrium Properties. J Phys Chem B 2014; 118:8170-8. [DOI: 10.1021/jp5012523] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Mithila V. Agnihotri
- Biophysics Program and ‡Department of
Chemistry and Biochemistry, Ohio State University, Columbus, Ohio 43210, United States
| | - Si-Han Chen
- Biophysics Program and ‡Department of
Chemistry and Biochemistry, Ohio State University, Columbus, Ohio 43210, United States
| | - Corey Beck
- Biophysics Program and ‡Department of
Chemistry and Biochemistry, Ohio State University, Columbus, Ohio 43210, United States
| | - Sherwin J. Singer
- Biophysics Program and ‡Department of
Chemistry and Biochemistry, Ohio State University, Columbus, Ohio 43210, United States
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Marini Bettolo Marconi U, Melchionna S. Charge transport in nanochannels: a molecular theory. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:13727-13740. [PMID: 22916965 DOI: 10.1021/la302815z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We introduce a theoretical and numerical method to investigate the flow of charged fluid mixtures under extreme confinement. We model the electrolyte solution as a ternary mixture comprising two ionic species of opposite charge and a third uncharged component. The microscopy approach is based on kinetic theory and is fully self-consistent. It allows us to determine configurational properties, such as layering near the confining walls and the flow properties. We show that, under the appropriate assumptions, the approach reproduces the phenomenological equations used to describe electrokinetic phenomena, without requiring the introduction of constitutive equations to determine the fluxes. Moreover, we model channels of arbitrary shape and nanometric roughness, features that have important repercussions on the transport properties of these systems. Numerical simulations are obtained by solving the evolution dynamics of the one-particle phase-space distributions of each species by means of a lattice Boltzmann method for flows in straight and wedged channels. Results are presented for the microscopic density, the velocity profiles, and the volumetric and charge flow rates. Strong departures from electroneutrality are shown to appear at the molecular level.
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Kokil A, Yang K, Kumar J. Techniques for characterization of charge carrier mobility in organic semiconductors. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/polb.23103] [Citation(s) in RCA: 119] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Hatlo MM, Panja D, van Roij R. Translocation of DNA molecules through nanopores with salt gradients: the role of osmotic flow. PHYSICAL REVIEW LETTERS 2011; 107:068101. [PMID: 21902370 DOI: 10.1103/physrevlett.107.068101] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2010] [Indexed: 05/31/2023]
Abstract
Recent experiments of translocation of double-stranded DNA through nanopores [M. Wanunu et al., Nature Nanotech. 5, 160 (2009)] reveal that the DNA capture rate can be significantly influenced by a salt gradient across the pore. We show that osmotic flow combined with electrophoretic effects can quantitatively explain the experimental data on the salt-gradient dependence of the capture rate.
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Affiliation(s)
- Marius M Hatlo
- Institute for Theoretical Physics, Utrecht University, The Netherlands.
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Wang Y, Wang Y, Chen K, Li B. Non-equilibrium molecular dynamics simulation of electrokinetic effects on heterogeneous ionic transport in nano-channel. Chem Eng Sci 2011. [DOI: 10.1016/j.ces.2011.03.038] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Numerical simulation of the electrophoretic transport of a biopolymer through a synthetic nano-pore. MOLECULAR SIMULATION 2011. [DOI: 10.1080/08927022.2011.553229] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Zhang H, Hassanali AA, Shin YK, Knight C, Singer SJ. The water–amorphous silica interface: Analysis of the Stern layer and surface conduction. J Chem Phys 2011; 134:024705. [DOI: 10.1063/1.3510536] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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12
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Wang M, Kang Q, Ben-Naim E. Modeling of electrokinetic transport in silica nanofluidic channels. Anal Chim Acta 2010; 664:158-64. [DOI: 10.1016/j.aca.2010.02.018] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2009] [Revised: 02/24/2010] [Accepted: 02/27/2010] [Indexed: 11/25/2022]
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13
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Ge Y, Xu D, Yang J, Chen Y, Li D. Ionic current through a nanopore three nanometers in diameter. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2009; 80:021918. [PMID: 19792162 DOI: 10.1103/physreve.80.021918] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2009] [Revised: 05/22/2009] [Indexed: 05/28/2023]
Abstract
Ionic current through a 3 nm in diameter nanopore has been investigated using molecular dynamics. Results indicate that the ionic current increases linearly as the electrolyte concentration increases from 0.4 to 0.9 M, beyond which the ionic current increases at a slower rate. In contradiction to the expectation that higher surface charge density will lead to more ions in the nanopore, and therefore, higher ionic current, the ionic current shows an increase-decrease profile as the surface charge density increases. These unusual observations are attributed to the fact that ions close to the wall experience large viscous force, leading to low mobility.
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Affiliation(s)
- Yanyan Ge
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments and China Education Council Key Laboratory of MEMS, School of Mechanical Engineering, Southeast University, Nanjing 210096, People's Republic of China
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Kim D, Darve E. High-ionic-strength electroosmotic flows in uncharged hydrophobic nanochannels. J Colloid Interface Sci 2009; 330:194-200. [DOI: 10.1016/j.jcis.2008.10.029] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2008] [Revised: 10/07/2008] [Accepted: 10/10/2008] [Indexed: 10/21/2022]
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15
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Wang M, Liu J, Chen S. Electric potential distribution in nanoscale electroosmosis: from molecules to continuum. MOLECULAR SIMULATION 2008. [DOI: 10.1080/08927020701663321] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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16
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Chen Y, Ni Z, Wang G, Xu D, Li D. Electroosmotic flow in nanotubes with high surface charge densities. NANO LETTERS 2008; 8:42-48. [PMID: 18095727 DOI: 10.1021/nl0718566] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The ion distribution and electroosmotic flow of sodium chlorine solutions confined in cylindrical nanotubes with high surface charge densities are studied with molecular dynamics (MD). To obtain a more practical physical model for electroosmotic driven flow in a nanoscale tube, the MD simulation process consists of two steps. The first step is used to equilibrate the system and to obtain a more realistic ion distribution in the solution under different surface charge densities. Then, an external electric field is acted to drive the liquids. The simulation results indicate that with the increase of the surface charge density, both the thickness of the electric double layer and the peak height of the counterion density increase. However, the phenomenon of charge inversion does not occur even as the surface charge density increases to -0.34 C/m2, which is rather difficult to reach for real materials in practical situations. This simulation result confirms the recent experimental observation that monovalent ions of sufficiently high concentrations can reduce or even cancel the charge inversion occurred in the case of multivalent ions [F. H. J. van der Heyden et al. Phys. Rev. Lett. 2006, 96, 224502].
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Affiliation(s)
- Yunfei Chen
- School of Mechanical Engineering and China Education Council Key Laboratory of MEMS, Southeast University, Nanjing, 210096, People's Republic of China.
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17
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Xu D, Li D, Leng Y, Chen Y. Molecular dynamics simulations of ion distribution in nanochannels. MOLECULAR SIMULATION 2007. [DOI: 10.1080/08927020701528532] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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18
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Coropceanu V, Cornil J, da Silva Filho DA, Olivier Y, Silbey R, Brédas JL. Charge transport in organic semiconductors. Chem Rev 2007; 107:926-52. [PMID: 17378615 DOI: 10.1021/cr050140x] [Citation(s) in RCA: 2079] [Impact Index Per Article: 122.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Veaceslav Coropceanu
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA
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19
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Wang M, Liu J, Chen S. Similarity of electroosmotic flows in nanochannels. MOLECULAR SIMULATION 2007. [DOI: 10.1080/08927020601096804] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Buhai B, Kimmich R. Dissimilar electro-osmotic flow and ionic current recirculation patterns in porous media detected by NMR mapping experiments. PHYSICAL REVIEW LETTERS 2006; 96:174501. [PMID: 16712301 DOI: 10.1103/physrevlett.96.174501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2005] [Revised: 01/31/2006] [Indexed: 05/09/2023]
Abstract
Random-site percolation clusters were milled into ceramic (polar) and polystyrene (nonpolar) plates as a paradigm for porous media or complex microsystem channel networks. The pore space was filled with electrolyte solutions. Using NMR microscopy techniques, maps of the following quantities were recorded: (i) flow velocity driven by external pressure gradient, (ii) electro-osmotic flow (EOF) velocity, (iii) ionic current density in the presence of EOF, (iv) ionic current density in the absence of EOF. As far as possible, the experiments were supplemented by computational fluid dynamics simulations. It is shown that electro-osmotic flow as well as the electric current density include vortices and recirculation patterns. Remarkably, all transport patterns turned out to be dissimilar, and the occurrence and positions of vortices do not coincide in the different maps.
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Affiliation(s)
- Bogdan Buhai
- Sektion Kernresonanzspektroskopie, Universität Ulm, Germany
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Wang J, Wang M, Li Z. Lattice Poisson–Boltzmann simulations of electro-osmotic flows in microchannels. J Colloid Interface Sci 2006; 296:729-36. [PMID: 16226765 DOI: 10.1016/j.jcis.2005.09.042] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2005] [Revised: 09/13/2005] [Accepted: 09/17/2005] [Indexed: 11/27/2022]
Abstract
This paper presents the numerical results of electro-osmotic flows in micro- and nanofluidics using a lattice Poisson-Boltzmann method (LPBM) which combines a potential evolution method on discrete lattices to solve the nonlinear Poisson equation (lattice Poisson method) with a density evolution method on discrete lattices to solve the Boltzmann-BGK equation (lattice Boltzmann method). In an electrically driven osmotic flow field, the flow velocity increases with both the external electrical field strength and the surface zeta potential for flows in a homogeneous channel. However, for a given electrical field strength and zeta potential, electrically driven flows have an optimal ionic concentration and an optimum width that maximize the flow velocity. For pressure-driven flows, the electro-viscosity effect increases with the surface zeta potential, but has an ionic concentration that yields the largest electro-viscosity effect. The zeta potential arrangement has little effect on the electro-viscosity for heterogeneous channels. For flows driven by both an electrical force and a pressure gradient, various zeta potential arrangements were considered for maximize the mixing enhancement with a less energy dissipation.
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Affiliation(s)
- Jinku Wang
- School of Aerospace, Tsinghua University, Beijing 100084, PR China
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