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Niu Y, Ma Y, Xie Y. Soft Memristor at a Microbubble Interface. NANO LETTERS 2024; 24:10475-10481. [PMID: 39116301 DOI: 10.1021/acs.nanolett.4c02136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/10/2024]
Abstract
Memristors show promising features for neuromorphic computing. Here we report a soft memristor based on the liquid-vapor surface of a microbubble. The thickness of the liquid film was modulated by electrostatic and interfacial forces, enabling resistance switches. We found a pinched current hysteresis at scanning periods between 1.6 and 51.2 s, while representing a resistor below 1.6 s and a diode-like behavior above 51.2 s. We approximate the thickening/thinning dynamics of liquid film by pressure-driven flow at the interface and derived the impacts of salt concentration and voltage amplitude on the memory effects. Our work opens a new approach to building nanofluidic memristors by a soft interface, which may be useful for new types of neuromorphic computing in the future.
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Affiliation(s)
- Yueke Niu
- School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an, 710072, China
| | - Yu Ma
- School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an, 710072, China
| | - Yanbo Xie
- National Key Laboratory of Aircraft Configuration Design, School of Aeronautics and Institute of Extreme Mechanics, Northwestern Polytechnical University, Xi'an, 710072, China
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2
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Majhi S, Bhattacharyya S, Gopmandal PP. Effect of the Surface Charge-Dependent Boundary Slip on the Electrophoresis of a Hydrophobic Polarizable Rigid Colloid. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024. [PMID: 38324781 DOI: 10.1021/acs.langmuir.3c03436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
The electrophoresis of a hydrophobic charged rigid colloid is studied by considering the lateral movement of the adsorbed surface charge. The slip velocity condition at the hydrophobic surface is modified to take into account the impact of the frictional and electric forces created by the adsorbed laterally mobile surface charge. Though the dependency of the surface charge on the slip velocity in the context of electrophoresis has been addressed before, the effect of the laterally mobile adsorbed surface charge on the electrophoresis of hydrophobic colloids has not been studied. The dielectric colloid is considered to polarize and create an induced immobile surface charge when subjected to an imposed electric field. The impact of the mobile surface charge along with the immobile induced surface charge on electrophoresis of a hydrophobic colloid is elucidated by numerically solving the governing electrokinetic equations in their full form. We have also developed a simplified model under a weak applied field consideration, which can be further reduced to a closed-form analytic expression for the mobility under the Debye-Hückel approximation. This analytic model for mobility is in excellent agreement with the exact numerical solution for an entire range of the Debye length when the ζ-potential is in the order of the thermal potential. One of the notable features of this closed-form mobility expression is that it accounts for the mobile adsorbed surface charge on the hydrodynamic slip condition and the dielectric polarization of the particle. We find that the mobility of the surface charge decreases the electrophoretic mobility of the hydrophobic dielectric colloid. However, the mobile surface charge enhances the mobility of a conducting hydrophobic colloid.
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Affiliation(s)
- Subrata Majhi
- Department of Mathematics, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Somnath Bhattacharyya
- Department of Mathematics, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Partha P Gopmandal
- Department of Mathematics, National Institute of Technology Durgapur, Durgapur 713209, India
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3
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An S, Ranaweera R, Luo L. Harnessing bubble behaviors for developing new analytical strategies. Analyst 2021; 145:7782-7795. [PMID: 33107897 DOI: 10.1039/d0an01497d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Gas bubbles are easily accessible and offer many unique characteristic properties of a gas/liquid two-phase system for developing new analytical methods. In this minireview, we discuss the newly developed analytical strategies that harness the behaviors of bubbles. Recent advancements include the utilization of the gas/liquid interfacial activity of bubbles for detection and preconcentration of surface-active compounds; the employment of the gas phase properties of bubbles for acoustic imaging and detection, microfluidic analysis, electrochemical sensing, and emission spectroscopy; and the application of the mass transport behaviors at the gas/liquid interface in gas sensing, biosensing, and nanofluidics. These studies have demonstrated the versatility of gas bubbles as a platform for developing new analytical strategies.
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Affiliation(s)
- Shizhong An
- School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China
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4
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Sun CQ. Water electrification: Principles and applications. Adv Colloid Interface Sci 2020; 282:102188. [PMID: 32610204 DOI: 10.1016/j.cis.2020.102188] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 05/30/2020] [Accepted: 06/02/2020] [Indexed: 01/20/2023]
Abstract
Deep engineering of liquid water by charge and impurity injection, charged support, current flow, hydrophobic confinement, or applying a directional field has becoming increasingly important to the mankind toward overcoming energy and environment crisis. One can mediate the processes or temperatures of molecular evaporation for clean water harvesting, HO bond dissociation for H2 fuel generation, solidification for living-organism cryopreservation, structure stiffening for bioengineering, etc., with mechanisms being still puzzling. We show that the framework of "hydrogen bonding and electronic dynamics" has substantiated the progress in the fundamental issues and the aimed engineering. The segmental disparity of the coupled hydrogen bond (O:HO or HB with ":" being lone pair of oxygen) resolves their specific-heat curves and turns out a quasisolid phase (QS, bound at -15 and 4 °C). Electrification shows dual functionality that not only aligns, orders, polarizes water molecules but also stretches the O:HO bond. The O:HO segmental cooperative relaxation and polarization shift the QS boundary through Einstein's relation, ΔΘDx ∝ Δωx, resulting in a gel-like, viscoelastic, and stable supersolid phase with raised melting point Tm and lowered temperatures for vaporization TV and ice nucleation TN. The supersolidity and electro structure ordering provide additional forces to reinforce Armstrong's water bridge. QS dispersion and the secondary effect of electrification such as compression define the TN for Dufour's electro-freezing. The TV depression, surface stress disruption, and electrostatic attraction raise Asakawa's molecular evaporability. Composition of opposite, compatible fields eases the HO dissociation and soil wetting. Progress evidences not only the essentiality of the coupled O:HO bond theory but also the feasibility of engineering water and solutions by programmed electrification.
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Affiliation(s)
- Chang Q Sun
- School of EEE, Nanyang Technological University, 639798, Singapore; School of Material Science and Engineering, Jilin University, Changchun 130022, China.
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5
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Hussein Sheik A, Montazersadgh F, Starov VM, Trybala A, Wijayantha KGU, Bandulasena HCH. Electrokinetic Transport of a Charged Dye in a Freely Suspended Liquid Film: Experiments and Numerical Simulations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:1183-1191. [PMID: 31957457 DOI: 10.1021/acs.langmuir.9b03852] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Electrokinetic transport of a charged dye within a free liquid film stabilized by a cationic surfactant, trimethyl(tetradecyl)ammonium bromide, subjected to an external electric field was investigated. Confocal laser scanning microscopy was used to visualize fluorescein isothiocyanate (FITC) separation within the stabilized liquid film. Numerical simulations were performed using the finite element method to model the dynamics of charged dye separation fronts observed in the experiments. Because of the electrochemical reactions at the electrodes, significant spatial and temporal pH changes were observed within the liquid film. These local pH changes could affect the local zeta potential at the gas-liquid and solid-liquid film boundaries; hence, the flow field was found to be highly dynamic and complex. The charged dye (FITC) used in the experiments is pH-sensitive, and therefore, electrophoresis of the dye also depended on the local pH. The pH and the electroosmotic flow field predicted from the numerical simulations were useful for understanding charged dye separation near both the anode and the cathode.
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Affiliation(s)
| | - Faraz Montazersadgh
- Wolfson School of Mechanical, Electrical and Manufacturing Engineering , Loughborough University , Loughborough LE11 3TU , U.K
| | | | - Anna Trybala
- Department of Chemical Engineering , Loughborough University , Loughborough LE11 3TU , U.K
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6
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Ma Y, Sun M, Duan X, van den Berg A, Eijkel JCT, Xie Y. Dimension-reconfigurable bubble film nanochannel for wetting based sensing. Nat Commun 2020; 11:814. [PMID: 32041959 PMCID: PMC7010761 DOI: 10.1038/s41467-020-14580-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Accepted: 01/15/2020] [Indexed: 12/27/2022] Open
Abstract
Dimensions and surface properties are the predominant factors for the applications of nanofluidic devices. Here we use a thin liquid film as a nanochannel by inserting a gas bubble in a glass capillary, a technique we name bubble-based film nanofluidics. The height of the film nanochannel can be regulated by the Debye length and wettability, while the length independently changed by applied pressure. The film nanochannel behaves functionally identically to classical solid state nanochannels, as ion concentration polarizations. Furthermore, the film nanochannels can be used for label-free immunosensing, by principle of wettability change at the solid interface. The optimal sensitivity for the biotin-streptavidin reaction is two orders of magnitude higher than for the solid state nanochannel, suitable for a full range of electrolyte concentrations. We believe that the film nanochannel represents a class of nanofluidic devices that is of interest for fundamental studies and also can be widely applied, due to its reconfigurable dimensions, low cost, ease of fabrication and multiphase interfaces.
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Affiliation(s)
- Yu Ma
- International Joint Laboratory of Nanofluidics and Interfaces, School of Physical Science and Technology, Northwestern Polytechnical University, 710100, Xi'an, China
- MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, 710072, Xi'an, China
| | - Miao Sun
- International Joint Laboratory of Nanofluidics and Interfaces, School of Physical Science and Technology, Northwestern Polytechnical University, 710100, Xi'an, China
- MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, 710072, Xi'an, China
| | - Xuexin Duan
- State Key Laboratory of Precision Measuring Technology and Instruments, College of Precision Instrument and Opto-Electronics Engineering, Tianjin University, 300072, Tianjin, China
| | - Albert van den Berg
- International Joint Laboratory of Nanofluidics and Interfaces, School of Physical Science and Technology, Northwestern Polytechnical University, 710100, Xi'an, China
- BIOS Lab-on-a-Chip Group, MESA+ Institute for Nanotechnology, Technical Medical Centre and Max Planck Center for Complex Fluid Dynamics, University of Twente, 7522NB, Enschede, The Netherlands
| | - Jan C T Eijkel
- International Joint Laboratory of Nanofluidics and Interfaces, School of Physical Science and Technology, Northwestern Polytechnical University, 710100, Xi'an, China
- BIOS Lab-on-a-Chip Group, MESA+ Institute for Nanotechnology, Technical Medical Centre and Max Planck Center for Complex Fluid Dynamics, University of Twente, 7522NB, Enschede, The Netherlands
| | - Yanbo Xie
- International Joint Laboratory of Nanofluidics and Interfaces, School of Physical Science and Technology, Northwestern Polytechnical University, 710100, Xi'an, China.
- MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, 710072, Xi'an, China.
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7
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Hussein Sheik A, Montazersadgh F, Starov V, Trybala A, Bandulasena HH. Procedures used in electrokinetic investigations of surfactant-laden interfaces, liquid films and foam system. Curr Opin Colloid Interface Sci 2018. [DOI: 10.1016/j.cocis.2018.09.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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8
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Blanc B, Bonhomme O, Brevet PF, Benichou E, Ybert C, Biance AL. Electroosmosis near surfactant laden liquid-air interfaces. SOFT MATTER 2018; 14:2604-2609. [PMID: 29492490 DOI: 10.1039/c7sm02508d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Generation of an electroosmostic (EO) flow near a liquid-gas interface covered with ionic surfactants is experimentally investigated. A combination of microscopic flow measurements with a molecular characterization of the interface by second harmonic generation (SHG) shows that under an electrical forcing, although a liquid flow is generated below the free surface, the surfactants remain immobile. The zeta potential was then determined and compared to the surfactant surface coverage. This combination of experimental techniques opens the route to simultaneously probe the liquid flow near a soapy interface and the corresponding surfactant repartition affecting the hydrodynamic boundary condition.
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Affiliation(s)
- Baptiste Blanc
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, F-69622, France.
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9
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Mollaei S, Nasiri M, Soltanmohammadi N, Shirsavar R, Ramos A, Amjadi A. Soap-film flow induced by electric fields in asymmetric frames. Phys Rev E 2018; 97:043110. [PMID: 29758613 DOI: 10.1103/physreve.97.043110] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2017] [Indexed: 11/07/2022]
Abstract
Net fluid flow of soap films induced by (ac or dc) electric fields in asymmetric frames is presented. Previous experiments of controllable soap film flow required the simultaneous use of an electrical current passing through the film and an external electric field or the use of nonuniform ac electric fields. Here a single voltage difference generates both the electrical current going through the film and the electric field that actuates on the charge induced on the film. The film is set into global motion due to the broken symmetry that appears by the use of asymmetric frames. If symmetric frames are used, the film flow is not steady but time dependent and irregular. Finally, we study numerically these film flows by employing the model of charge induction in ohmic liquids.
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Affiliation(s)
- S Mollaei
- Department of Physics, Faculty of Science, University of Zanjan, Zanjan P.O. Box 45371-38791, Iran
| | - M Nasiri
- Department of Physics, Faculty of Science, University of Zanjan, Zanjan P.O. Box 45371-38791, Iran
| | - N Soltanmohammadi
- Department of Physics, Faculty of Science, University of Zanjan, Zanjan P.O. Box 45371-38791, Iran
| | - R Shirsavar
- Department of Physics, Faculty of Science, University of Zanjan, Zanjan P.O. Box 45371-38791, Iran and Department of Physics, Sharif University of Technology, Tehran P.O. Box 11365-9161, Iran
| | - A Ramos
- Departamento de Electrónica y Electromagnetismo, Facultad de Física, Universidad de Sevilla, Seville 41012, Spain
| | - A Amjadi
- Department of Physics, Sharif University of Technology, Tehran P.O. Box 11365-9161, Iran
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10
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Electroosmotic Flow in Free Liquid Films: Understanding Flow in Foam Plateau Borders. COLLOIDS AND INTERFACES 2018. [DOI: 10.3390/colloids2010008] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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11
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Bonhomme O, Blanc B, Joly L, Ybert C, Biance AL. Electrokinetic transport in liquid foams. Adv Colloid Interface Sci 2017; 247:477-490. [PMID: 28662766 DOI: 10.1016/j.cis.2017.06.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Revised: 05/22/2017] [Accepted: 06/06/2017] [Indexed: 11/25/2022]
Abstract
Investigating electrokinetic transport in a liquid foam is at the confluence of two well developed research areas. On one hand, the study of electrokinetic flows (i.e. surface-driven flows generated close to a charged interface) is fairly well understood in regards the solid/liquid interface. On the other hand, the flow of liquid in a 3D deformable network, i.e a foam, under a volume force such as gravity has been thoroughly studied over the past decade. The overlapping zone of these two frameworks is of great interest for both communities as it gives rise to challenging new questions such as: what is the importance of the nature of the charged interface, created by mobile and soluble surfactants in the case of foam, on electrokinetic transport? How does a foam behave when submitted to a surface-driven flow? Can we compensate a volume-driven flow, i.e. gravity, by a surface-driven flow, i.e. electroosmosis? In this review, we will explore these questions on three different scales: a surfactant laden interface, a foam film and a macroscopic foam.
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12
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Barbosa De Lima A, Joly L. Electro-osmosis at surfactant-laden liquid-gas interfaces: beyond standard models. SOFT MATTER 2017; 13:3341-3351. [PMID: 28422239 DOI: 10.1039/c7sm00358g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Electro-osmosis (EO) is a powerful tool to manipulate liquids in micro and nanofluidic systems. While EO has been studied extensively at liquid-solid interfaces, the case of liquid-vapor interfaces, found e.g. in foam films and bubbles, remains to be explored. Here we perform molecular dynamics (MD) simulations of EO in a film of aqueous electrolyte covered with fluid layers of ionic surfactants and surrounded by gas. Following the experimental procedure, we compute the zeta potential from the EO velocity, defined as the velocity difference between the middle of the liquid film and the surrounding gas. We show that the zeta potential can be smaller or larger than existing predictions depending on the surfactant coverage. We explain the failure of previous descriptions by the fact that surfactants and bound ions move as rigid bodies and do not transmit the electric driving force to the liquid locally. Considering the reciprocal streaming current effect, we then develop an extended model, which can be used to predict the experimental zeta potential of surfactant-laden liquid-gas interfaces.
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Affiliation(s)
- Alexia Barbosa De Lima
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622, LYON, France.
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13
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Hussein Sheik A, Bandulasena HCH, Starov V, Trybala A. Electroosmotic flow measurements in a freely suspended liquid film: Experimhents and numerical simulations. Electrophoresis 2017; 38:2554-2560. [DOI: 10.1002/elps.201600549] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 02/28/2017] [Accepted: 03/02/2017] [Indexed: 11/12/2022]
Affiliation(s)
| | | | - Victor Starov
- Department of Chemical Engineering; Loughborough University; Loughborough UK
| | - Anna Trybala
- Department of Chemical Engineering; Loughborough University; Loughborough UK
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14
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Uematsu Y, Netz RR, Bonthuis DJ. Power-law electrokinetic behavior as a direct probe of effective surface viscosity. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2016.12.056] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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15
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Nasiri M, Shirsavar R, Mollaei S, Ramos A. Numerical study of soap-film flow by nonuniform alternating electric fields. Phys Rev E 2017; 95:022806. [PMID: 28297867 DOI: 10.1103/physreve.95.022806] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Indexed: 11/07/2022]
Abstract
Fluid flow of suspended liquid films induced by non-uniform alternating electric fields has been reported. The electric fields were generated by two rod-like electrodes perpendicular to the fluid surface. The observed fluid flow was explained qualitatively by considering a charge induction mechanism, where the electric field actuates on the charge induced on the film surface. In this paper we perform a numerical study of this fluid flow taking into account the charge induction mechanism. The numerical results are compared with experiments and good agreement is found. Finally, we propose the application of the device as a new kind of two dimensional fluid pump.
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Affiliation(s)
- M Nasiri
- Department of Physics, Faculty of Science, University of Zanjan, Zanjan, Iran
| | - R Shirsavar
- Department of Physics, Faculty of Science, University of Zanjan, Zanjan, Iran
| | - S Mollaei
- Department of Physics, Faculty of Science, University of Zanjan, Zanjan, Iran
| | - A Ramos
- Departamento de Electrónica y Electromagnetismo, Facultad de Física, Universidad de Sevilla, Sevilla, Spain
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16
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Sett S, Sahu RP, Sinha-Ray S, Yarin AL. Experimental Investigation of Eletrokinetic Stabilization of Gravitational Drainage of Ionic Surfactants Films. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2015.11.076] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Teixeira MAC, Arscott S, Cox SJ, Teixeira PIC. What is the Shape of an Air Bubble on a Liquid Surface? LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:13708-13717. [PMID: 26605984 DOI: 10.1021/acs.langmuir.5b03970] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We have calculated the equilibrium shape of the axially symmetric meniscus along which a spherical bubble contacts a flat liquid surface by analytically integrating the Young-Laplace equation in the presence of gravity, in the limit of large Bond numbers. This method has the advantage that it provides semianalytical expressions for key geometrical properties of the bubble in terms of the Bond number. Results are in good overall agreement with experimental data and are consistent with fully numerical (Surface Evolver) calculations. In particular, we are able to describe how the bubble shape changes from hemispherical, with a flat, shallow bottom, to lenticular, with a deeper, curved bottom, as the Bond number is decreased.
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Affiliation(s)
- Miguel A C Teixeira
- Department of Meteorology, University of Reading Earley Gate , P.O. Box 243, Reading RG6 6BB, United Kingdom
- Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN) CNRS UMR8520, The University of Lille Cité Scientifique , Avenue Poincaré, 59652 Villeneuve d'Ascq, France
- Department of Mathematics, Aberystwyth University Aberystwyth , Ceredigion SY23 3BZ, United Kingdom
- ISEL - Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa Rua Conselheiro Emídio Navarro 1 , 1959-007 Lisbon, Portugal
- Centro de Física Teórica e Computacional, Faculdade de Ciências da Universidade de Lisboa Campo Grande , Edifício C8, 1749-016 Lisbon, Portugal
| | - Steve Arscott
- Department of Meteorology, University of Reading Earley Gate , P.O. Box 243, Reading RG6 6BB, United Kingdom
- Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN) CNRS UMR8520, The University of Lille Cité Scientifique , Avenue Poincaré, 59652 Villeneuve d'Ascq, France
- Department of Mathematics, Aberystwyth University Aberystwyth , Ceredigion SY23 3BZ, United Kingdom
- ISEL - Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa Rua Conselheiro Emídio Navarro 1 , 1959-007 Lisbon, Portugal
- Centro de Física Teórica e Computacional, Faculdade de Ciências da Universidade de Lisboa Campo Grande , Edifício C8, 1749-016 Lisbon, Portugal
| | - Simon J Cox
- Department of Meteorology, University of Reading Earley Gate , P.O. Box 243, Reading RG6 6BB, United Kingdom
- Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN) CNRS UMR8520, The University of Lille Cité Scientifique , Avenue Poincaré, 59652 Villeneuve d'Ascq, France
- Department of Mathematics, Aberystwyth University Aberystwyth , Ceredigion SY23 3BZ, United Kingdom
- ISEL - Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa Rua Conselheiro Emídio Navarro 1 , 1959-007 Lisbon, Portugal
- Centro de Física Teórica e Computacional, Faculdade de Ciências da Universidade de Lisboa Campo Grande , Edifício C8, 1749-016 Lisbon, Portugal
| | - Paulo I C Teixeira
- Department of Meteorology, University of Reading Earley Gate , P.O. Box 243, Reading RG6 6BB, United Kingdom
- Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN) CNRS UMR8520, The University of Lille Cité Scientifique , Avenue Poincaré, 59652 Villeneuve d'Ascq, France
- Department of Mathematics, Aberystwyth University Aberystwyth , Ceredigion SY23 3BZ, United Kingdom
- ISEL - Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa Rua Conselheiro Emídio Navarro 1 , 1959-007 Lisbon, Portugal
- Centro de Física Teórica e Computacional, Faculdade de Ciências da Universidade de Lisboa Campo Grande , Edifício C8, 1749-016 Lisbon, Portugal
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18
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Bonhomme O, Mounier A, Simon G, Biance AL. Surface conductivity measurements in nanometric to micrometric foam films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:194118. [PMID: 25923979 DOI: 10.1088/0953-8984/27/19/194118] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Foam films (a liquid lamella in air covered by surfactants) are tools of choice for nanofluidic characterization as they are intrinsically nanometric. Their size is indeed fixed by a balance between external pressure and particular molecular interactions in the vicinity of interfaces. To probe the exact nature of these interfaces, different characterizations can be performed. Among them, conductivity in confined systems is a direct probe of the electrostatic environment in the vicinity of the surface. Therefore, we designed a dedicated experiment to measure this conductivity in a cylindrical bubble coupled to interferometry for film thickness characterization. We then show that this conductivity depends on the surfactant nature. These conductivity measurements have been performed in an extremely confined system, the so called Newton black foam films. Unexpectedly in this case, a conductivity close to surface conductivity is recovered.
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Affiliation(s)
- Oriane Bonhomme
- Institut Lumière Matière ILM, University Lyon 1-CNRS, UMR 5586, Domaine Scientifique de la Doua, Bâtiment Léon Brillouin 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne, France
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19
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Maduar SR, Belyaev AV, Lobaskin V, Vinogradova OI. Electrohydrodynamics near hydrophobic surfaces. PHYSICAL REVIEW LETTERS 2015; 114:118301. [PMID: 25839314 DOI: 10.1103/physrevlett.114.118301] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Indexed: 06/04/2023]
Abstract
We show that an electro-osmotic flow near the slippery hydrophobic surface depends strongly on the mobility of surface charges, which are balanced by counterions of the electrostatic diffuse layer. For a hydrophobic surface with immobile charges, the fluid transport is considerably amplified by the existence of a hydrodynamic slippage. In contrast, near the hydrophobic surface with mobile adsorbed charges, it is also controlled by an additional electric force, which increases the shear stress at the slipping interface. To account for this, we formulate electrohydrodynamic boundary conditions at the slipping interface, which should be applied to quantify electro-osmotic flows instead of hydrodynamic boundary conditions. Our theoretical predictions are fully supported by dissipative particle dynamics simulations with explicit charges. These results lead to a new interpretation of zeta potential of hydrophobic surfaces.
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Affiliation(s)
- S R Maduar
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 31 Leninsky Prospect, 119071 Moscow, Russia
- Department of Physics, M. V. Lomonosov Moscow State University, 119991 Moscow, Russia
| | - A V Belyaev
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 31 Leninsky Prospect, 119071 Moscow, Russia
- Department of Physics, M. V. Lomonosov Moscow State University, 119991 Moscow, Russia
- Federal Research and Clinical Center of Pediatric Hematology, Oncology and Immunology, 1 Samora Machel street, 117997 Moscow, Russia
- Center for Theoretical Problems of Physicochemical Pharmacology RAS, 38A Leninsky Prospect, 119991 Moscow, Russia
| | - V Lobaskin
- School of Physics and CASL, University College Dublin, Belfield, Dublin 4, Ireland
| | - O I Vinogradova
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 31 Leninsky Prospect, 119071 Moscow, Russia
- Department of Physics, M. V. Lomonosov Moscow State University, 119991 Moscow, Russia
- DWI-Leibniz Institute for Interactive Materials, RWTH Aachen, Forckenbeckstraße 50, 52056 Aachen, Germany
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Oscillation of the velvet worm slime jet by passive hydrodynamic instability. Nat Commun 2015; 6:6292. [PMID: 25780995 PMCID: PMC4382676 DOI: 10.1038/ncomms7292] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Accepted: 01/14/2015] [Indexed: 12/22/2022] Open
Abstract
The rapid squirt of a proteinaceous slime jet endows velvet worms (Onychophora) with a unique mechanism for defence from predators and for capturing prey by entangling them in a disordered web that immobilizes their target. However, to date, neither qualitative nor quantitative descriptions have been provided for this unique adaptation. Here we investigate the fast oscillatory motion of the oral papillae and the exiting liquid jet that oscillates with frequencies f~30–60 Hz. Using anatomical images, high-speed videography, theoretical analysis and a physical simulacrum, we show that this fast oscillatory motion is the result of an elastohydrodynamic instability driven by the interplay between the elasticity of oral papillae and the fast unsteady flow during squirting. Our results demonstrate how passive strategies can be cleverly harnessed by organisms, while suggesting future oscillating microfluidic devices, as well as novel ways for micro and nanofibre production using bioinspired strategies. The velvet worm emits a rapidly oscillating jet of proteinaceous slime to capture prey. Here, Concha et al. combine high-speed videography and a physical simulacrum to establish that this passive mechanism is the result of elastohydrodynamic instability during high-speed flow through the oral papillae.
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Fameau AL, Carl A, Saint-Jalmes A, von Klitzing R. Responsive Aqueous Foams. Chemphyschem 2014; 16:66-75. [DOI: 10.1002/cphc.201402580] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Indexed: 12/30/2022]
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Huerre A, Miralles V, Jullien MC. Bubbles and foams in microfluidics. SOFT MATTER 2014; 10:6888-902. [PMID: 24913678 DOI: 10.1039/c4sm00595c] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Microfluidics offers great tools to produce highly-controlled dispersions of gas into liquid, from isolated bubbles to organized microfoams. Potential technological applications are manifold, from novel materials to scaffolds for tissue engineering or enhanced oil recovery. More fundamentally, microfluidics makes it possible to investigate the physics of complex systems such as foams at scales where the capillary forces become dominant, in model experiments involving few well-controlled parameters. In this context, this review does not have the ambition to detail in a comprehensive manner all the techniques and applications involving bubbles and foams in microfluidics. Rather, it focuses on particular consequences of working at the microscale, under confinement, and hopes to provide insight into the physics of such systems. The first part of this work focuses on bubbles, and more precisely on (i) bubble generation, where the confinement can suppress capillary instabilities while inertial effects may play a role, and (ii) bubble dynamics, paying special attention to the lubrication film between bubble and wall and the influence of confinement. The second part addresses the formation and dynamics of microfoams, emphasizing structural differences from macroscopic foams and the influence of the confinement.
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Affiliation(s)
- Axel Huerre
- MMN, UMR CNRS Gulliver 7083, PSL research University, ESPCI ParisTech, 10 rue Vauquelin, 75005 Paris, France.
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Bocquet L, Tabeling P. Physics and technological aspects of nanofluidics. LAB ON A CHIP 2014; 14:3143-3158. [PMID: 25046581 DOI: 10.1039/c4lc00325j] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
From a physical perspective, nanofluidics represents an extremely rich domain. It hosts many mechanisms acting on the nanoscale, which combine together or interact with the confinement to generate new phenomena. Superfast flows in carbon nanotubes, nonlinear electrokinetic transport, slippage over smooth surfaces, nanobubble stability, etc. are the most striking phenomena that have been unveiled over the past few years, and some of them are still awaiting an explanation. One may anticipate that new nanofluidic effects will be discovered in the future, but at the moment, the technological barrier is high. Fabrication of nanochannels is most often a tour de force, slow and costly. However, with the accumulation of technological skills along with the use of new nanofluidic materials (like nanotubes), nanofluidics is becoming increasingly accessible to experimentalists. Among the technological challenges faced by the field, fabricating devices mimicking natural nanometric systems, such as aquaporins, ionic pumps or kidney osmotic filtering, seems the most demanding in terms of groundbreaking ideas. Nanoflow characterization remains delicate, although considerable progress has been achieved over the past years. The targeted application of nanofluidics is not only in the field of genomics and membrane science--with disruptive developments to be expected for water purification, desalination, and energy harvesting--but also for oil and gas production from unconventional reservoirs. Today, in view of the markets that are targeted, nanofluidics may well impact the industry more than microfluidics; this would represent an unexpected paradox. These successes rely on using a variety of materials and technologies, using state-of-the-art nanofabrication, or low-tech inexpensive approaches. As a whole, nanofluidics is a fascinating field that is facing considerable challenges today. It possesses a formidable potential and offers much space for creative groundbreaking ideas.
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Affiliation(s)
- Lyderic Bocquet
- Institut Lumière Matière, UMR 5306 CNRS - University Lyon 1, 69622 Villeurbanne, France and Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, UMI 3466 CNRS-MIT, Cambridge, Massachusetts 02139, USA.
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Joly L, Detcheverry F, Biance AL. Anomalous ζ potential in foam films. PHYSICAL REVIEW LETTERS 2014; 113:088301. [PMID: 25192128 DOI: 10.1103/physrevlett.113.088301] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Indexed: 06/03/2023]
Abstract
Electrokinetic effects offer a method of choice to control flows in micro- and nanofluidic systems. While a rather clear picture of these phenomena exists now for the liquid-solid interfaces, the case of liquid-air interfaces remains largely unexplored. Here, we investigate at the molecular level electrokinetic transport in a liquid film covered with ionic surfactants. We find that the ζ potential, quantifying the amplitude of electrokinetic effects, depends on the surfactant coverage in an unexpected way. First, it increases upon lowering surfactant coverage from saturation. Second, it does not vanish in the limit of low coverage but instead approaches a finite value. This behavior is rationalized by taking into account the key role of interfacial hydrodynamics, together with an ion-binding mechanism. We point out implications of these results for the strongly debated measurements of the ζ potential at free interfaces and for electrokinetic transport in liquid foams.
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Affiliation(s)
- Laurent Joly
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne, France
| | - François Detcheverry
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne, France
| | - Anne-Laure Biance
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne, France
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Miralles V, Selva B, Cantat I, Jullien MC. Foam drainage control using thermocapillary stress in a two-dimensional microchamber. PHYSICAL REVIEW LETTERS 2014; 112:238302. [PMID: 24972233 DOI: 10.1103/physrevlett.112.238302] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Indexed: 06/03/2023]
Abstract
We investigate the drainage of a 2D microfoam in a vertical Hele-Shaw cell, and show that the Marangoni stress at the air-water interface generated by a constant temperature gradient applied in situ can be tuned to control the drainage. The temperature gradient is applied in such a way that thermocapillarity and gravity have an antagonistic effect. We characterize the drainage over time by measuring the liquid volume fraction in the cell and find that thermocapillarity can overcome the effect of gravity, effectively draining the foam towards the top of the cell, or exactly compensate it, maintaining the liquid fraction at its initial value over at least 60 s. We quantify these results by solving the mass balance in the cell, and provide insight into the interplay between gravity, thermocapillarity, and capillary pressure governing the drainage dynamics.
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Affiliation(s)
- V Miralles
- MMN, UMR CNRS Gulliver 7083, PSL research University, ESPCI ParisTech, 10 rue Vauquelin, F-75005 Paris, France
| | - B Selva
- LOF, unité mixte Solvay-CNRS-Bordeaux 1, 178 avenue du Docteur Schweitzer, F-33608 Pessac cedex, France
| | - I Cantat
- IPR, (UMR CNRS 6251), Université de Rennes 1, 35000 Rennes, France
| | - M-C Jullien
- MMN, UMR CNRS Gulliver 7083, PSL research University, ESPCI ParisTech, 10 rue Vauquelin, F-75005 Paris, France
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