1
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Liu R, Liu Z, Zhao Y, Cui P, Wu H. Role of Carbon Nanotube Wetting Transparency in Rapid Water Transport for a Nanopore Membrane. NANO LETTERS 2024; 24:3484-3489. [PMID: 38456741 DOI: 10.1021/acs.nanolett.4c00287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/09/2024]
Abstract
A carbon nanotube (CNT) may facilitate near-frictionless water transport within it. In this work, we elucidate the slip flow characteristics for a CNT embedded in a silicon nitride matrix using the molecular dynamics (MD) method. We reveal that the wetting transparency of a CNT, the transmission of the membrane matrix wetting property over a CNT, cannot be ignored. Due to the effect of CNT wetting transparency, the orientation flip behavior of water molecules should be the primary cause of the entrance and exit losses, which is a dominant factor influencing the interfacial friction coefficient for the thin CNT membrane. The relationship between the friction coefficient and pore size follows a logarithmic function, which agrees well with the reported experimental data. Our findings bridge the gap between the MD prediction and experimental observation for water transport in a CNT membrane and provide a clear understanding of the mechanism behind its ultrafast flow performance.
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Affiliation(s)
- Runkeng Liu
- School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zhenyu Liu
- School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Yueqi Zhao
- School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Peilin Cui
- School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Huiying Wu
- School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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2
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Li H, Ge Z, Aminpour M, Wen L, Galindo-Torres SA. Pressure-dependent flow enhancement in carbon nanotubes. J Chem Phys 2024; 160:054503. [PMID: 38341689 DOI: 10.1063/5.0179870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 01/11/2024] [Indexed: 02/13/2024] Open
Abstract
It is a known and experimentally verified fact that the flow of pressure-driven nanoconfined fluids cannot be accurately described by the Navier-Stokes (NS) equations with non-slip boundary conditions, and the measured volumetric flow rates are much higher than those predicted by macroscopical continuum models. In particular, the flow enhancement factors (the ratio between the flow rates directly measured by experiments or simulations and those predicted by the non-slip NS equation) reported by previous studies have more than five orders of magnitude differences. We showcased an anomalous phenomenon in which the flow enhancement exhibits a non-monotonic correlation with fluid pressure within the carbon nanotube with a diameter of 2 nm. Molecular dynamics simulations indicate that the inconsistency of flow behaviors is attributed to the phase transition of nanoconfined fluid induced by fluid pressures. The nanomechanical mechanisms are contributed by complex hydrogen-bonding interactions and regulated water orientations. This study suggests a method for explaining the inconsistency of flow enhancements by considering the pressure-dependent molecular structures.
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Affiliation(s)
- Hangtong Li
- College of Environmental and Resource Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, Zhejiang, China
- Key Laboratory of Coastal Environment and Resources of Zhejiang Province (KLaCER), School of Engineering, Westlake University, 600 Dunyu Rd., Hangzhou 310030, Zhejiang, China
| | - Zhuan Ge
- Key Laboratory of Coastal Environment and Resources of Zhejiang Province (KLaCER), School of Engineering, Westlake University, 600 Dunyu Rd., Hangzhou 310030, Zhejiang, China
| | - Mohammad Aminpour
- Civil and Infrastructure Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3001, Australia
| | - Liaoyong Wen
- Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province, School of Engineering, Westlake University, 600 Dunyu Rd., Hangzhou 310030, Zhejiang, China
| | - Sergio Andres Galindo-Torres
- Key Laboratory of Coastal Environment and Resources of Zhejiang Province (KLaCER), School of Engineering, Westlake University, 600 Dunyu Rd., Hangzhou 310030, Zhejiang, China
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3
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Potisk T, Sablić J, Svenšek D, Diego ES, Teran FJ, Praprotnik M. Analyte‐Driven Clustering of Bio‐Conjugated Magnetic Nanoparticles. ADVANCED THEORY AND SIMULATIONS 2023. [DOI: 10.1002/adts.202200796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
Affiliation(s)
- Tilen Potisk
- Laboratory for Molecular Modeling National Institute of Chemistry SI‐1001 Ljubljana Slovenia
- Faculty of Mathematics and Physics University of Ljubljana SI‐1001 Ljubljana Slovenia
| | - Jurij Sablić
- Laboratory for Molecular Modeling National Institute of Chemistry SI‐1001 Ljubljana Slovenia
- Department of Condensed Matter Physics University of Barcelona E‐08028 Barcelona Spain
- Centre Européen de Calcul Atomique et Moléculaire École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Daniel Svenšek
- Laboratory for Molecular Modeling National Institute of Chemistry SI‐1001 Ljubljana Slovenia
- Faculty of Mathematics and Physics University of Ljubljana SI‐1001 Ljubljana Slovenia
| | | | - Francisco J. Teran
- IMDEA Nanociencia Ciudad Universitaria de Cantoblanco 28049 Madrid Spain
- Nanobiotecnología (iMdea‐Nanociencia) Unidad Asociada al Centro Nacional de Biotecnología (CSIC) 28049 Madrid Spain
| | - Matej Praprotnik
- Laboratory for Molecular Modeling National Institute of Chemistry SI‐1001 Ljubljana Slovenia
- Faculty of Mathematics and Physics University of Ljubljana SI‐1001 Ljubljana Slovenia
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4
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Bui AT, Thiemann FL, Michaelides A, Cox SJ. Classical Quantum Friction at Water-Carbon Interfaces. NANO LETTERS 2023; 23:580-587. [PMID: 36626824 PMCID: PMC9881168 DOI: 10.1021/acs.nanolett.2c04187] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 01/04/2023] [Indexed: 05/20/2023]
Abstract
Friction at water-carbon interfaces remains a major puzzle with theories and simulations unable to explain experimental trends in nanoscale waterflow. A recent theoretical framework─quantum friction (QF)─proposes to resolve these experimental observations by considering nonadiabatic coupling between dielectric fluctuations in water and graphitic surfaces. Here, using a classical model that enables fine-tuning of the solid's dielectric spectrum, we provide evidence from simulations in general support of QF. In particular, as features in the solid's dielectric spectrum begin to overlap with water's librational and Debye modes, we find an increase in friction in line with that proposed by QF. At the microscopic level, we find that this contribution to friction manifests more distinctly in the dynamics of the solid's charge density than that of water. Our findings suggest that experimental signatures of QF may be more pronounced in the solid's response rather than liquid water's.
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Affiliation(s)
- Anna T. Bui
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, Lensfield Road, CambridgeCB2 1EW, United Kingdom
| | - Fabian L. Thiemann
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, Lensfield Road, CambridgeCB2 1EW, United Kingdom
- Thomas
Young Centre, London Centre for Nanotechnology, and Department of
Physics and Astronomy, University College
London, Gower Street, LondonWC1E 6BT, United Kingdom
- Department
of Chemical Engineering, Sargent Centre for Process Systems Engineering, Imperial College London, South Kensington Campus, LondonSW7 2AZ, United Kingdom
| | - Angelos Michaelides
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, Lensfield Road, CambridgeCB2 1EW, United Kingdom
| | - Stephen J. Cox
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, Lensfield Road, CambridgeCB2 1EW, United Kingdom
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5
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Uthe B, Sader JE, Pelton M. Optical measurement of the picosecond fluid mechanics in simple liquids generated by vibrating nanoparticles: a review. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2022; 85:103001. [PMID: 36049471 DOI: 10.1088/1361-6633/ac8e82] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Accepted: 09/01/2022] [Indexed: 06/15/2023]
Abstract
Standard continuum assumptions commonly used to describe the fluid mechanics of simple liquids have the potential to break down when considering flows at the nanometer scale. Two common assumptions for simple molecular liquids are that (1) they exhibit a Newtonian response, where the viscosity uniquely specifies the linear relationship between the stress and strain rate, and (2) the liquid moves in tandem with the solid at any solid-liquid interface, known as the no-slip condition. However, even simple molecular liquids can exhibit a non-Newtonian, viscoelastic response at the picosecond time scales that are characteristic of the motion of many nanoscale objects; this viscoelasticity arises because these time scales can be comparable to those of molecular relaxation in the liquid. In addition, even liquids that wet solid surfaces can exhibit nanometer-scale slip at those surfaces. It has recently become possible to interrogate the viscoelastic response of simple liquids and associated nanoscale slip using optical measurements of the mechanical vibrations of metal nanoparticles. Plasmon resonances in metal nanoparticles provide strong optical signals that can be accessed by several spectroscopies, most notably ultrafast transient-absorption spectroscopy. These spectroscopies have been used to measure the frequency and damping rate of acoustic oscillations in the nanoparticles, providing quantitative information about mechanical coupling and exchange of mechanical energy between the solid particle and its surrounding liquid. This information, in turn, has been used to elucidate the rheology of viscoelastic simple liquids at the nanoscale in terms of their constitutive relations, taking into account separate viscoelastic responses for both shear and compressible flows. The nanoparticle vibrations have also been used to provide quantitative measurements of slip lengths on the single-nanometer scale. Viscoelasticity has been shown to amplify nanoscale slip, illustrating the interplay between different aspects of the unconventional fluid dynamics of simple liquids at nanometer length scales and picosecond time scales.
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Affiliation(s)
- Brian Uthe
- Department of Physics, UMBC (University of Maryland, Baltimore County), Baltimore, MD 21250, United States of America
| | - John E Sader
- School of Mathematics and Statistics, The University of Melbourne, Victoria 3010, Australia
| | - Matthew Pelton
- Department of Physics, UMBC (University of Maryland, Baltimore County), Baltimore, MD 21250, United States of America
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6
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Papadopoulou E, Megaridis CM, Walther JH, Koumoutsakos P. Nanopumps without Pressure Gradients: Ultrafast Transport of Water in Patterned Nanotubes. J Phys Chem B 2022; 126:660-669. [DOI: 10.1021/acs.jpcb.1c07562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ermioni Papadopoulou
- Computational Science and Engineering Laboratory, ETH Zürich, Zürich CH-8092, Switzerland
| | - Constantine M. Megaridis
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Jens H. Walther
- Computational Science and Engineering Laboratory, ETH Zürich, Zürich CH-8092, Switzerland
- Department of Mechanical Engineering, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Petros Koumoutsakos
- Computational Science and Engineering Laboratory, ETH Zürich, Zürich CH-8092, Switzerland
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
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7
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Papadopoulou E, Zavadlav J, Podgornik R, Praprotnik M, Koumoutsakos P. Tuning the Dielectric Response of Water in Nanoconfinement through Surface Wettability. ACS NANO 2021; 15:20311-20318. [PMID: 34813279 DOI: 10.1021/acsnano.1c08512] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The tunable polarity of water can be exploited in emerging technologies including catalysis, gas storage, and green chemistry. Recent experimental and theoretical studies have shown that water can be rendered into an effectively apolar solvent under nanoconfinement. We furthermore demonstrate, through molecular simulations, that the static dielectric constant of water can be modified by changing the wettability of the confining material. We find the out-of-plane dielectric response to be highly sensitive to the level of confinement and can be reduced up to 40× , in accordance with experimental data. By altering the surface wettability from superhydrophilic to superhydrophobic, we observe a 36% increase for the out-of-plane and a 31% decrease for the in-plane dielectric constants. Our findings demonstrate the feasibility of tunable water polarity, a phenomenon with great potential for scientific and technological impact.
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Affiliation(s)
- Ermioni Papadopoulou
- Computational Science and Engineering Laboratory, ETH-Zurich, Clausiusstrasse 33, CH-8092 Zurich, Switzerland
| | - Julija Zavadlav
- Professorship of Multiscale Modeling of Fluid Materials, TUM School of Engineering and Design, Technical University of Munich, Boltzmannstrasse 15, DE-85748 Garching near Munich, Germany
| | - Rudolf Podgornik
- School of Physical Sciences and Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI-1000 Ljubljana, Slovenia
- CAS Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Wenzhou Institute of the University of Chinese Academy of Sciences, Wenzhou, Zhejiang 325000, China
| | - Matej Praprotnik
- Laboratory for Molecular Modeling, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia
- Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI-1000 Ljubljana, Slovenia
| | - Petros Koumoutsakos
- Computational Science and Engineering Laboratory, ETH-Zurich, Clausiusstrasse 33, CH-8092 Zurich, Switzerland
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
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8
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Chen Z, Dong X, Chen Z. n-decane diffusion in carbon nanotubes with vibration. J Chem Phys 2021; 154:074505. [PMID: 33607913 DOI: 10.1063/5.0038869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Carbon nanotubes (CNTs) have a wide range of applications in nanotechnology engineering. This research aims to quantify the effect of wall vibration on n-decane molecules' diffusion in double-walled CNTs (DWNTs) with different diameters and determine the diffusion mechanisms behind it. Molecular dynamics simulations are performed to generate mass density profiles of confined n-decane molecules. The root mean square fluctuation and mean squared displacement analyses show that the confinement suppresses n-decane molecules' fluctuations. A self-diffusion coefficient of n-decane molecules in a 13.6 Å-diameter DWNT is the largest. However, the vibration enhancement of the n-decane molecules' diffusion in a 27.1 Å-diameter DWNT is 207%, more extensive than that in 13.6 Å-diameter and 10.8 Å-diameter DWNTs. The n-decane-CNT attractive interactions, extreme confinement, and surface friction affect the n-decane molecules' diffusion in CNTs with vibration.
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Affiliation(s)
- Zhongliang Chen
- State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
| | - Xiaohu Dong
- State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
| | - Zhangxin Chen
- State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
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9
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Evans JD, Krause S, Feringa BL. Cooperative and synchronized rotation in motorized porous frameworks: impact on local and global transport properties of confined fluids. Faraday Discuss 2021; 225:286-300. [DOI: 10.1039/d0fd00016g] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Simulations reveal the influence of rotating molecular motors and the importance of orientation and directionality for altering the transport properties of fluids. This has outlined that motors with specific rotation can generate directed diffusion.
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Affiliation(s)
- Jack D. Evans
- Department of Inorganic Chemistry
- Technische Universität Dresden
- 01062 Dresden
- Germany
| | - Simon Krause
- Centre for Systems Chemistry
- Stratingh Institute for Chemistry
- University of Groningen
- Groningen
- The Netherlands
| | - Ben L. Feringa
- Centre for Systems Chemistry
- Stratingh Institute for Chemistry
- University of Groningen
- Groningen
- The Netherlands
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10
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Wang D, Wang L, Hu Z. The speed-locking effect of particles on a graphene layer with travelling surface wave. NANOSCALE RESEARCH LETTERS 2020; 15:203. [PMID: 33112999 PMCID: PMC7593379 DOI: 10.1186/s11671-020-03434-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Accepted: 10/15/2020] [Indexed: 05/21/2023]
Abstract
Fast diffusion induced by thermal fluctuation and vibration has been detected at nanoscales. In this paper, the movement of particle on a graphene layer with travelling surface wave is studied by molecular dynamics simulation and theoretical model. It is proved that the particle will keep moving at the wave speed with certain prerequisite conditions, namely speed-locking effect. By expressing van der Waals (vdW) potential between particle and wavy surface as a function of curvatures, the mechanism is clarified based on the puddle of potential in a relative wave-frame coordinate. Two prerequisite conditions are proposed: the initial position of particle should locate in the potential puddle, and the initial kinetic energy cannot drive particle to jump out of the potential puddle. The parametric analysis indicates that the speed-locking region will be affected by wavelength, amplitude and pair potential between particle and wave. With smaller wavelength, larger amplitude and stronger vdW potential, the speed-locking region is larger. This work reveals a new kind of coherent movement for particles on layered material based on the puddle potential theory, which can be an explanation for fast diffusion phenomena at nano scales.
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Affiliation(s)
- Dan Wang
- Key Laboratory of Mechanics and Control of Mechanical Structures, Interdisciplinary Research Institute, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 211100 People’s Republic of China
| | - Lifeng Wang
- Key Laboratory of Mechanics and Control of Mechanical Structures, Interdisciplinary Research Institute, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 211100 People’s Republic of China
| | - Zhili Hu
- Key Laboratory of Mechanics and Control of Mechanical Structures, Interdisciplinary Research Institute, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 211100 People’s Republic of China
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11
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Chen J. Phonon-Induced Ratchet Motion of a Water Nanodroplet on a Supported Black Phosphorene. J Phys Chem Lett 2020; 11:4298-4304. [PMID: 32392074 DOI: 10.1021/acs.jpclett.0c01179] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Phonons are not supposed to carry any physical momentum as lattice vibrational modes; thus, it is believed no mass transport could be induced by phonons. In this Letter, we show that a ratchet motion of a water nanodroplet could be induced on a two-dimensional puckered lattice like black phosphorene (BP) by exciting its flexural phonons through a moving substrate. The water nanodroplet exhibits a forward motion along the armchair or a backward motion along the zigzag directions on a BP lattice that is supported on a substrate possessing a relative armchair or zigzag forward motion with BP. Through the analysis of the structure and vibrational density states of BP, it is found that in-plane lattice displacement asymmetry and the in-plane vibration asymmetry are induced by the excited flexural phonons, which determine the water nanodroplet motion as an anisotropic Brownian motor. Simulations of the nanodroplet motion as functions of the substrate relative motion speed and direction and also the substrate coupling strength with BP are performed. Results of the nanodroplet ratchet motion exhibit good agreement with the theoretical predications from calculating the Brownian motor asymmetry. Our findings reveal a promising mass transport strategy and a further understanding of phonon-related interactions in crystalline solids.
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Affiliation(s)
- Jige Chen
- Zhangjiang Laboratory, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
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12
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Delle Site L, Praprotnik M, Bell JB, Klein R. Particle–Continuum Coupling and its Scaling Regimes: Theory and Applications. ADVANCED THEORY AND SIMULATIONS 2020. [DOI: 10.1002/adts.201900232] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Luigi Delle Site
- Freie Universität Berlin Institute of Mathematics Arnimallee 6, 14195 Berlin Germany
| | - Matej Praprotnik
- Laboratory for Molecular Modeling National Institute of Chemistry SI‐1001 Ljubljana, Slovenia & Department of Physics Faculty of Mathematics and Physics University of Ljubljana SI‐1000 Ljubljana Slovenia
| | - John B. Bell
- Lawrence Berkeley National Lab 1 Cyclotron Rd. Berkeley CA 94720 USA
| | - Rupert Klein
- Freie Universität Berlin Institute of Mathematics Arnimallee 6, 14195 Berlin Germany
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13
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Fan W, Chen J. Two-state diffusive mobility of slow and fast transport of water in narrow nanochannels. Phys Rev E 2020; 101:010101. [PMID: 32069533 DOI: 10.1103/physreve.101.010101] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Indexed: 11/06/2022]
Abstract
Transport of water in narrow nanochannels as a single-file chain is involved in various biological activities and nanofluidic applications. However, although the consistent dipole orientation of the water molecules is intensively studied, its effect upon the transport behavior is still unknown. In this Rapid Communication, we find two states of slow and fast transport coexist in the single-file water in the presence of channel defects that break the collective dipole orientation. A low diffusive mobility is found for the dipole orientation inconsistent configurations while mobility approximately two times higher is found for the consistent ones. The two-state diffusion process relies on the different hydrogen bond connections, which possess overlapped structures, enabling a spontaneous transition. The slow state is insensitive to the increased defect number while the fast state is reduced accordingly. The two states exhibit different lifetime and temperature dependences that demonstrate a possibility for manipulation. Our result implies the possibility of two-state diffusion process of water in nanofluid phenomena due to the common presence of defects in nanochannels.
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Affiliation(s)
- Wen Fan
- Department of Physics, Fudan University, Shanghai 200433, China.,Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
| | - Jige Chen
- Zhangjiang Laboratory, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China.,Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
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14
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Papadopoulou E, Megaridis CM, Walther JH, Koumoutsakos P. Ultrafast Propulsion of Water Nanodroplets on Patterned Graphene. ACS NANO 2019; 13:5465-5472. [PMID: 31025854 DOI: 10.1021/acsnano.9b00252] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The directed transport of liquids at the nanoscale is of great importance for nanotechnology applications ranging from water filtration to the cooling of electronics and precision medicine. Here we demonstrate such unidirectional, pumpless transport of water nanodroplets on graphene sheets patterned with hydrophilic/phobic areas inspired by natural systems. We find that spatially varying patterning of the graphene surfaces can lead to water transport at ultrafast velocities, far exceeding macroscale estimates. We perform extensive molecular dynamics simulations to show that such high transport velocities ( O(102 m/s)) are due to differences of the advancing and receding contact angles of the moving droplet. This contact angle hysteresis and the ensuing transport depend on the surface pattern and the droplet size. We present a scaling law for the driving capillary and resisting friction forces on the water droplet and use it to predict nanodroplet trajectories on a wedge-patterned graphene sheet. The present results demonstrate that graphene with spatially variable wettability is a potent material for fast and precise transport of nanodroplets with significant potential for directed nanoscale liquid transport and precision drug delivery.
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Affiliation(s)
- Ermioni Papadopoulou
- Computational Science and Engineering Laboratory , ETH Zürich , Zürich CH-8092 , Switzerland
| | - Constantine M Megaridis
- Department of Mechanical and Industrial Engineering , University of Illinois at Chicago , Chicago , Illinois 60607 , United States
| | - Jens H Walther
- Computational Science and Engineering Laboratory , ETH Zürich , Zürich CH-8092 , Switzerland
- Department of Mechanical Engineering , Technical University of Denmark , 2800 Kongens Lyngby , Denmark
| | - Petros Koumoutsakos
- Computational Science and Engineering Laboratory , ETH Zürich , Zürich CH-8092 , Switzerland
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15
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Ma M, Grey F, Shen L, Urbakh M, Wu S, Liu JZ, Liu Y, Zheng Q. Reply to 'On phonons and water flow enhancement in carbon nanotubes'. NATURE NANOTECHNOLOGY 2017; 12:1108. [PMID: 29209009 DOI: 10.1038/nnano.2017.235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Affiliation(s)
- Ming Ma
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
- Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
- Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China
| | - Francois Grey
- Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China
- London Centre for Nanotechnology, University College London, London WC1H 0AJ, UK
- Department of Physics, Tsinghua University, Beijing 100084, China
- Citizen Cyberlab, CUI, University of Geneva, CH-1227 Carouge, Switzerland
| | - Luming Shen
- School of Civil Engineering, University of Sydney, Sydney, NSW 2006, Australia
| | - Michael Urbakh
- School of Chemistry, Tel Aviv University, 69978 Tel Aviv, Israel
- XIN Center, Tsinghua University, Beijing 100084, China, and Tel Aviv University, 69978 Tel Aviv, Israel
| | - Shuai Wu
- Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China
- Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
| | - Jefferson Zhe Liu
- Department of Mechanical Engineering, The University of Melbourne, Melbourne, VIC 3010, Australia
| | - Yilun Liu
- International Center for Applied Mechanics, SV Lab, School of Aerospace, Xi'an Jiaotong University, Xi'an 710049, China
| | - Quanshui Zheng
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
- Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China
- XIN Center, Tsinghua University, Beijing 100084, China, and Tel Aviv University, 69978 Tel Aviv, Israel
- Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
- Applied Mechanics Lab, Tsinghua University, Beijing 100084, China
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