1
|
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.
Collapse
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
| |
Collapse
|
2
|
Chakraborty B, Dutta D. Low temperature phase properties of water confined in MCM41 mesopores at different hydration levels: A molecular dynamics study. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138728] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
3
|
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.
Collapse
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
| |
Collapse
|
4
|
Prakash K, K V S D, Kumar Kannam S, Sathian SP. Non-isothermal flow of an electrolyte in a charged nanochannel. NANOTECHNOLOGY 2020; 31:425403. [PMID: 32365344 DOI: 10.1088/1361-6528/ab8fe4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Electrokinetic flows are generally analyzed, assuming isothermal conditions even though such situations are hard to be achieved in practice. In this paper, the flow of a symmetric electrolyte in a charged nanochannel subjected to an axial temperature gradient is investigated using molecular dynamics simulations. We analyze the relative contribution of the Soret effect, the thermoelectric effect, and the double layer potential in the electrical double layer for various surface charges and temperature gradients. We find the flow driven by thermal gradient is analogous to electroosmotic flow. The thermophoretic motion of the electrolyte is significant for negative surface charge than the positive surface charge. The vibrational spectrum of graphene is calculated to delineate the effect of the surface charge polarity on the observed thermophoretic motion of the electrolyte. A unique structure of interfacial water layer is observed for the positive and negative surface charges. We attribute the presence of these structures to the differences in water-carbon interactions existing for various surface charge polarity. For an applied thermal gradient in the range 2.6 K nm-1 to 8 K nm-1, we observe a continuous net flow with average velocities reaching up to 9.4 m s-1 inside the channel for a negative surface charge of -0.101 C m-2. The results indicate that in a charged graphene-based nanochannel, temperature gradients can be employed to induce streaming current, depending on the relative influence of the Soret effect and the double layer potential.
Collapse
Affiliation(s)
- Kiran Prakash
- Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai, India
| | | | | | | |
Collapse
|
5
|
Abstract
Liquid-phase exfoliation (LPE) is the best-known method for the synthesis of two-dimensional (2D) nanosheets. Compared to enthalpy, entropy is hardly considered to be a factor in choosing energy-efficient solvents and has not even been verified to be negligible. In this Letter, we explore the entropy contribution in LPE by performing molecular dynamics (MD) simulation of the structural flexibility effect in graphene, hexagonal boron nitride (hBN), and molybdenum disulfide (MoS2). Our results show that surface vibration favors the exfoliation of graphene and hBN and destabilizes the reaggregation of nanosheets in water at 300 K, whereas the opposite is found for MoS2. The entropy change is found to be 41%, 48%, and 4% of the enthalpy gain for graphene, hBN, and MoS2 in LPE, respectively, and 64%, 32%, and 56% in reaggregation, which amounts to a step advancement for solvent screening in LPE of 2D materials.
Collapse
|
6
|
Jin Y, Tao R, Li Z. Understanding flow enhancement in graphene-coated nanochannels. Electrophoresis 2019; 40:859-864. [DOI: 10.1002/elps.201800465] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 12/04/2018] [Accepted: 12/17/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Yakang Jin
- Department of Mechanical and Aerospace Engineering; The Hong Kong University of Science and Technology; Hong Kong S. A. R. P. R. China
| | - Ran Tao
- Department of Mechanical and Aerospace Engineering; The Hong Kong University of Science and Technology; Hong Kong S. A. R. P. R. China
| | - Zhigang Li
- Department of Mechanical and Aerospace Engineering; The Hong Kong University of Science and Technology; Hong Kong S. A. R. P. R. China
| |
Collapse
|
7
|
Oyarzua E, Walther JH, Megaridis CM, Koumoutsakos P, Zambrano HA. Carbon Nanotubes as Thermally Induced Water Pumps. ACS NANO 2017; 11:9997-10002. [PMID: 28953353 DOI: 10.1021/acsnano.7b04177] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Thermal Brownian motors (TBMs) are nanoscale machines that exploit thermal fluctuations to provide useful work. We introduce a TBM-based nanopump which enables continuous water flow through a carbon nanotube (CNT) by imposing an axial thermal gradient along its surface. We impose spatial asymmetry along the CNT by immobilizing certain points on its surface. We study the performance of this molecular motor using molecular dynamics (MD) simulations. From the MD trajectories, we compute the net water flow and the induced velocity profiles for various imposed thermal gradients. We find that spatial asymmetry modifies the vibrational modes of the CNT induced by the thermal gradient, resulting in a net water flow against the thermal gradient. Moreover, the kinetic energy associated with the thermal oscillations rectifies the Brownian motion of the water molecules, driving the flow in a preferred direction. For imposed thermal gradients of 0.5-3.3 K/nm, we observe continuous net flow with average velocities up to 5 m/s inside CNTs with diameters of 0.94, 1.4, and 2.0 nm. The results indicate that the CNT-based asymmetric thermal motor can provide a controllable and robust system for delivery of continuous water flow with potential applications in integrated nanofluidic devices.
Collapse
Affiliation(s)
- Elton Oyarzua
- Department of Chemical Engineering, Universidad de Concepcion , Concepcion 4030000, Chile
| | - Jens Honore Walther
- Department of Mechanical Engineering, Technical University of Denmark , DK-2800 Kongens Lyngby, Denmark
- Computational Science and Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich , CH-8092 Zurich, Switzerland
| | - Constantine M Megaridis
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago , Chicago, Illinois 60607, United States
| | - Petros Koumoutsakos
- Computational Science and Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich , CH-8092 Zurich, Switzerland
| | - Harvey A Zambrano
- Department of Chemical Engineering, Universidad de Concepcion , Concepcion 4030000, Chile
| |
Collapse
|
8
|
Ultrafast diffusion of Ionic Liquids Confined in Carbon Nanotubes. Sci Rep 2016; 6:28518. [PMID: 27334208 PMCID: PMC4917821 DOI: 10.1038/srep28518] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Accepted: 06/02/2016] [Indexed: 11/13/2022] Open
Abstract
Over the past decade many works have focused on various aspects of the dynamics of liquids confined at the nanoscale such as e.g. water flow enhancement through carbon nanotubes (CNTs). Transport of room temperature ionic liquids (RTILs) through various nanochannels has also been explored and some conflicting findings about their translational dynamics have been reported. In this work, we focus on translational dynamics of RTILs confined in various CNTs. By means of molecular dynamics simulations we highlight a substantially enhanced diffusion of confined RTILs with an increase up to two orders of magnitude with respect to bulk-phase properties. This ultrafast diffusion of RTILs inside CNTs is shown to result from the combination of various factors such as low friction, molecular stacking, size, helicity, curvature and cooperative dynamics effects.
Collapse
|
9
|
Maheshwari P, Dutta D, Mukherjee S, Madhu PK, Mote KR, Pujari PK. Positron annihilation and nuclear magnetic resonance study of the phase behavior of water confined in mesopores at different levels of hydration. Phys Chem Chem Phys 2016; 18:12886-95. [PMID: 27105178 DOI: 10.1039/c6cp01603k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We investigated the molecular origin of the phase behavior of water confined in MCM 41 mesopores at different levels of hydration using positron annihilation spectroscopic and nuclear magnetic resonance techniques. The level of hydration influenced the phase behavior of the nanoconfined water. Two transitions above and below the bulk freezing temperature were observed depending on the level of hydration. At the highest level of hydration, nucleation seemed to predominate over the effect of confinement, leading to the complete freezing of water, whereas disrupted H-bonding dominated at the lowest level of hydration, leading to the disappearance of the transitions. A transition at c. T = 188 K (close to the reported glass transition temperature of interface-affected water) was observed at intermediate hydration level. This study suggests that the H-bonding network within nanoconfined water, which can be tampered by the degree of hydration, is the key factor responsible for the phase behavior of supercooled water. This study on the phase behavior and associated transitions of nanoconfined water has implications for nanofluidics and drug-delivery systems, in addition to understanding the fundamentals of water in confinement.
Collapse
Affiliation(s)
- Priya Maheshwari
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai-400 085, India.
| | | | | | | | | | | |
Collapse
|