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Shi L, Zhong X, Wu T, Bian Q, Liu X, Miao H, Deng Y, Yin B, Zhou T. The electrodynamics of rod‐like microparticles based on optically induced dielectrophoresis. Electrophoresis 2022; 43:2175-2183. [DOI: 10.1002/elps.202200102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 09/03/2022] [Accepted: 09/06/2022] [Indexed: 11/07/2022]
Affiliation(s)
- Liuyong Shi
- Mechanical and Electrical Engineering College Hainan University Haikou P. R. China
| | - Xiangtao Zhong
- Mechanical and Electrical Engineering College Hainan University Haikou P. R. China
| | - Tao Wu
- Mechanical and Electrical Engineering College Hainan University Haikou P. R. China
| | - Qin Bian
- Mechanical and Electrical Engineering College Hainan University Haikou P. R. China
| | - Xiaomei Liu
- Mechanical and Electrical Engineering College Hainan University Haikou P. R. China
| | - Huaqing Miao
- Shenzhen Academy of Metrology & Quality Inspection Shenzhen P. R. China
| | - Yongbo Deng
- Changchun Institute of Optics Fine Mechanics and Physics (CIOMP) Chinese Academy of Science Changchun P. R. China
| | - Binfeng Yin
- School of Mechanical Engineering Yangzhou University Yangzhou P. R. China
| | - Teng Zhou
- Mechanical and Electrical Engineering College Hainan University Haikou P. R. China
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2
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Behera N, Chakraborty S. Electrically modulated relaxation dynamics of pre-stretched droplets post switched-off uniaxial extensional flow. SOFT MATTER 2022; 18:3678-3697. [PMID: 35502790 DOI: 10.1039/d1sm01813b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Droplets are known to elongate in extensional flow and exhibit capillary instabilities following flow cessation. Under several practical scenarios, where the deformed drops are exposed to electrified environments, the interplay between capillary and electric forces can further modulate the capillary-driven instability that may lead to novel drop evolution, which has not yet been explored. In the present study, we probe the transient droplet deformation under combined electrohydrodynamic and extensional flows, with a particular focus on the relaxation dynamics in a post-elongation phase, as the external flow field is withdrawn while the electric field remains on. Based on pre-relaxed droplet morphology and electric field strength, the drops appear to relax faster or slower, leading to a steady-state or a plethora of breakup events. The slightly deformed drops relax into stable prolate or oblate shape depending on the electrophysical properties of the fluid pairs. On the other hand, under large deformation limit, our results reveal that in the post-elongation phase, the electric field may either stabilize the droplet or may enforce its breakup primarily via two modes: mid-pinching and end-pinching. We have shown that the post-relaxation events can be mapped into the relevant parametric phase space as a function of the relative strengths of the various forcing parameters as well as geometric parameters. These results present new avenues of droplet manipulation in industrial and microfluidic applications by utilizing unique connectivity between the relaxation kinematics and imposed electrical forcing, a paradigm that has hitherto remained unaddressed.
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Affiliation(s)
- Nalinikanta Behera
- Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal-721302, India.
| | - Suman Chakraborty
- Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal-721302, India.
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3
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Chen X, Lv H. New insights into the micromixer with Cantor fractal obstacles through genetic algorithm. Sci Rep 2022; 12:4162. [PMID: 35264723 PMCID: PMC8907327 DOI: 10.1038/s41598-022-08144-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 02/28/2022] [Indexed: 11/29/2022] Open
Abstract
This work is mainly to combine fractal principle with multi-objective genetic algorithm, and the multi-objective optimization of the Cantor fractal baffle micromixer is carried out. At different Reynolds numbers (Res), the three-dimensional Navier–Stokes equation is employed to numerically analyze the fluid flow and mixing in the microchannel. We choose the ratio of the three parameters associated with the geometry of the micromixer as design variables, and take the mixing index and pressure drop at the outlet of the micromixer as two objective functions for optimization. For the parameter study of the design space, the Latin hypercube sampling (LHS) method is used as an experimental design technique, and it is used to select design points in the design space. We use the proxy modeling of the response surface analysis (RSA) to approximate the objective function. The genetic algorithm is used to get the Pareto optimal frontier of the micromixer. K-means clustering is used to classify the optimal solution set, and we select representative design variables from it. Through multi-objective optimization, when Re = 1 and 10, the optimized mixing efficiency of the micromixer increased by 20.59% and 14.07% compared with the reference design, respectively. And we also prove that this multi-objective optimization method is applicable to any Res.
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Affiliation(s)
- Xueye Chen
- College of Transportation, Ludong University, Yantai, 264025, Shandong, China.
| | - Honglin Lv
- Faculty of Mechanical Engineering and Automation, Liaoning University of Technology, Jinzhou, 121001, Liaoning, China
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4
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Kwizera EA, Sun M, White AM, Li J, He X. Methods of Generating Dielectrophoretic Force for Microfluidic Manipulation of Bioparticles. ACS Biomater Sci Eng 2021; 7:2043-2063. [PMID: 33871975 PMCID: PMC8205986 DOI: 10.1021/acsbiomaterials.1c00083] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Manipulation of microscale bioparticles including living cells is of great significance to the broad bioengineering and biotechnology fields. Dielectrophoresis (DEP), which is defined as the interactions between dielectric particles and the electric field, is one of the most widely used techniques for the manipulation of bioparticles including cell separation, sorting, and trapping. Bioparticles experience a DEP force if they have a different polarization from the surrounding media in an electric field that is nonuniform in terms of the intensity and/or phase of the electric field. A comprehensive literature survey shows that the DEP-based microfluidic devices for manipulating bioparticles can be categorized according to the methods of creating the nonuniformity via patterned microchannels, electrodes, and media to generate the DEP force. These methods together with the theory of DEP force generation are described in this review, to provide a summary of the methods and materials that have been used to manipulate various bioparticles for various specific biological outcomes. Further developments of DEP-based technologies include identifying materials that better integrate with electrodes than current popular materials (silicone/glass) and improving the performance of DEP manipulation of bioparticles by combining it with other methods of handling bioparticles. Collectively, DEP-based microfluidic manipulation of bioparticles holds great potential for various biomedical applications.
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Affiliation(s)
- Elyahb A. Kwizera
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
| | - Mingrui Sun
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio 43210, USA
| | - Alisa M. White
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
| | - Jianrong Li
- Department of Veterinary Biosciences, The Ohio State University, Columbus, OH 43210, USA
| | - Xiaoming He
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio 43210, USA
- Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, MD 20742, USA
- Marlene and Stewart Greenebaum Comprehensive Cancer Center, University of Maryland, Baltimore, MD 21201, USA
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5
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Huang Z, Wu Z, Zhou T, Shi L, Liu Z, Huang J. Multi-particle interaction in AC electric field driven by dielectrophoresis force. Electrophoresis 2021; 42:2189-2196. [PMID: 34117650 DOI: 10.1002/elps.202100094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 05/24/2021] [Accepted: 05/26/2021] [Indexed: 11/11/2022]
Abstract
When the dielectrophoresis technology is used to manipulate micron-sized particles, the interaction between particles should not be ignored because of the particle-particle interaction. Especially, when multiple particles (number of particles is above 2) are simultaneously manipulated, the interaction between neighboring particles will affect the results of the manipulation. This research investigates the interaction of particles caused dielectrophoresis effect by the Arbitrary Lagrangian-Eulerian (ALE) method based on the hypothesis of the thin layer of the electric double layer at the microscale. The mathematics model can be solved simultaneously by the finite element method for the AC electric field, the flow field around the suspended particles and the particle mechanics at the micrometer scale. In this study, the particle conductivity and the direction of the electric field are investigated, we find that particle conductivity and electric field direction pose an impact on particle movement, and the research reveal the law of microparticle dielectrophoresis movement, which could offer theoretical and technology support to profoundly understand the precise manipulation of particles in microfluidic chips by the dielectrophoresis effect.
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Affiliation(s)
- Zhiwei Huang
- Mechanical and Electrical Engineering College, Hainan University, Haikou, Hainan, P. R. China
| | - Zhihao Wu
- Mechanical and Electrical Engineering College, Hainan University, Haikou, Hainan, P. R. China
| | - Teng Zhou
- Mechanical and Electrical Engineering College, Hainan University, Haikou, Hainan, P. R. China
| | - Liuyong Shi
- Mechanical and Electrical Engineering College, Hainan University, Haikou, Hainan, P. R. China
| | - Zhenyu Liu
- Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP) 130033, Chinese Academy of Science, Changchun, Jilin, P. R. China
| | - Jiaomei Huang
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, P. R. China
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6
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The Effect of Wall Shear Stress on Two Phase Fluctuating Flow of Dusty Fluids by Using Light Hill Technique. WATER 2021. [DOI: 10.3390/w13111587] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Due to the importance of wall shear stress effect and dust fluid in daily life fluid problems. This paper aims to discover the influence of wall shear stress on dust fluids of fluctuating flow. The flow is considered between two parallel plates that are non-conducting. Due to the transformation of heat, the fluid flow is generated. We consider every dust particle having spherical uniformly disperse in the base fluid. The perturb solution is obtained by applying the Poincare-Lighthill perturbation technique (PLPT). The fluid velocity and shear stress are discussed for the different parameters like Grashof number, magnetic parameter, radiation parameter, and dusty fluid parameter. Graphical results for fluid and dust particles are plotted through Mathcad-15. The behavior of base fluid and dusty fluid is matching for different embedded parameters.
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7
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Zhou T, Ji X, Shi L, Hu N, Li T. Dielectrophoretic interactions of two rod-shaped deformable particles under DC electric field. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125493] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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8
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Zhou T, Ge J, Shi L, Liu Z, Deng Y, Peng Y, He X, Tang R, Wen L. Electrokinetic Translocation of a Deformable Nanoparticle through a Nanopore. ACS APPLIED BIO MATERIALS 2020; 3:5160-5168. [PMID: 35021692 DOI: 10.1021/acsabm.0c00606] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The nanopore-based biosensing technology is built up on the fluctuation of the ionic current induced by the electrokinetic translation of a particle penetrating the nanopore. It is expected that the current change of a deformable bioparticle is dissimilar from that of a rigid one. This study theoretically investigated the transient translocation process of a deformable particle through a nanopore for the first time. The mathematical model considers the Poisson equation for the electric potential, the Nernst-Planck equations for the ionic transport, the Navier-Stokes equations for the flow field, and the stress-strain equation for the dynamics of the deformable bioparticle. The arbitrary Lagrangian-Eulerian method is used for the fully coupled particle-fluid dynamic interaction. Results show that the deformation degree of the particle, the velocity deviation, and the current is different from the rigid particle. The deformation degree of the particle will reach the maximum when the particle passes a nanopore. Because of the deformation of particles, the total force applied on deformable particles is larger than that of rigid particles, resulting in larger velocity deviation and current deviation. The influences of the ratio of the nanoparticle radius to the Debye length and surface charge density of the nanopore are also studied. The research results illustrate the translocation mechanism of a deformable nanoparticle in the nanopore, which can provide theoretical guidance for the biosensing technology based on the nanopore.
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Affiliation(s)
- Teng Zhou
- Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, Hainan, China
| | - Jian Ge
- Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, Hainan, China
| | - Liuyong Shi
- Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, Hainan, China
| | - Zhenyu Liu
- State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP), Chinese Academy of Sciences, Changchun 130033, China
| | - Yongbo Deng
- State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP), Chinese Academy of Sciences, Changchun 130033, China
| | - Yinyin Peng
- Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, Hainan, China
| | - Xiaohan He
- Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, Hainan, China
| | - Rongnian Tang
- Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, Hainan, China
| | - Liping Wen
- CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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9
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The Influence of Electric Field Intensity and Particle Length on the Electrokinetic Transport of Cylindrical Particles Passing through Nanopore. MICROMACHINES 2020; 11:mi11080722. [PMID: 32722448 PMCID: PMC7463976 DOI: 10.3390/mi11080722] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 07/22/2020] [Accepted: 07/22/2020] [Indexed: 01/08/2023]
Abstract
The electric transport of nanoparticles passing through nanopores leads to a change in the ion current, which is essential for the detection technology of DNA sequencing and protein determination. In order to further illustrate the electrokinetic transport mechanism of particles passing through nanopores, a fully coupled continuum model is constructed by using the arbitrary Lagrangian–Eulerian (ALE) method. The model consists of the electric field described by the Poisson equation, the concentration field described by Nernst–Planck equation, and the flow field described by the Navier–Stokes equation. Based on this model, the influence of imposed electric field and particle length on the electrokinetic transport of cylindrical particles is investigated. It is found firstly the translation velocities for the longer particles remain constant when they locate inside the nanopore. Both the ion current blockade effect and the ion current enhancement effect occur when cylindrical particles enter and exit the nanopore, respectively, for the experimental parameters employed in this research. Moreover, the particle translation velocity and current fluctuation amplitude are dominated by the electric field intensity, which can be used to adjust the particle transmission efficiency and the ion current detectability. In addition, the increase in particle length changes the particle position corresponding to the peak value of the ion current, which contributes to distinguishing particles with different lengths as well.
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10
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Chen Y, Chen X, Liu S. Numerical investigations of a passive micromixer with tree shape obstacles based on fractal principle and Murray’s law. J DISPER SCI TECHNOL 2020. [DOI: 10.1080/01932691.2020.1770610] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Yao Chen
- Faculty of Mechanical Engineering and Automation, Liaoning University of Technology, Jinzhou, China
| | - Xueye Chen
- Faculty of Mechanical Engineering and Automation, Liaoning University of Technology, Jinzhou, China
| | - Shufen Liu
- Faculty of Mechanical Engineering and Automation, Liaoning University of Technology, Jinzhou, China
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11
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A Report On Fluctuating Free Convection Flow Of Heat Absorbing Viscoelastic Dusty Fluid Past In A Horizontal Channel With MHD Effect. Sci Rep 2020; 10:8523. [PMID: 32444854 PMCID: PMC7244736 DOI: 10.1038/s41598-020-65252-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Accepted: 11/28/2019] [Indexed: 11/21/2022] Open
Abstract
The free convective unsteady fluctuating, MHD flow of electrically conducting viscoelastic dusty fluid in a channel-driven with the impact of oscillating pressure gradient and the motion of the upper plate has been studied in this article. The noteworthy heat generation/absorption has also taken into account, the heat generation established the mechanism of heat transfer by both the momentum of fluid and the motion of dust particle and absorption of heat by the dust particle is because of conduction. The coupled governing partial differential equations are reduced to the ordinary differential equation through the assumed periodic solutions. Analytical solutions for the velocity of the fluid as well as the velocity of dust particles and for energy equation of the fluid and for dust particles are obtained by using Poincare-Light Hill Perturbation Technique. The influence of various parameters of interest is discussed on the velocity and temperature profiles of the fluid and particles. The evolution of fluid-phase and dusty-phase with dual behavior of the magnetic parameter for both boundary layer and free stream velocities has been discussed. The boundary layer velocity decreased with an increase in magnetic parameter, while at the free stream flow, the result is quite opposite. The above result of magnetic field is worthwhile and can be used to control the boundary layer thickness. The current work also concludes that by increasing the Peclet number and concentration of the dust particles retards the boundary layer velocity. Furthermore, various physical parameters like coefficient of heat absorption, concentration of the dust particles, peclet number, magnetic parameter, and temperature relaxation time parameter retard the motion of dusty-phase, while Grashof number enhances the flow of dusty-phase. Other properties of fluid, which have great importance for engineers are, the rate of heat transfer and skin friction. It is shown in Table 1 that by increasing the value of Peclet number from 1 to 2 it increases the rate of heat transfer from 1.3263 to 1.3387. Furthermore, Table 2 shows that by increasing the concentration parameter from 2 to 4 the skin friction increases from 2.3872 to 4.7799.
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12
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Han W, Chen X. A novel micro-nanofluidic preconcentrator with Koch fractal nanochannel surface. J DISPER SCI TECHNOL 2020. [DOI: 10.1080/01932691.2020.1724139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Wenbo Han
- Faculty of Mechanical Engineering and Automation, Liaoning University of Technology, Jinzhou, China
| | - Xueye Chen
- Faculty of Mechanical Engineering and Automation, Liaoning University of Technology, Jinzhou, China
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13
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Zhou T, Ji X, Shi L, Zhang X, Song Y, Joo SW. AC dielectrophoretic deformable particle‐particle interactions and their relative motions. Electrophoresis 2019; 41:952-958. [DOI: 10.1002/elps.201900266] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 09/01/2019] [Accepted: 09/07/2019] [Indexed: 01/07/2023]
Affiliation(s)
- Teng Zhou
- Mechanical and Electrical Engineering CollegeHainan University Haikou Hainan P. R. China
| | - Xiang Ji
- Mechanical and Electrical Engineering CollegeHainan University Haikou Hainan P. R. China
| | - Liuyong Shi
- Mechanical and Electrical Engineering CollegeHainan University Haikou Hainan P. R. China
| | - Xianman Zhang
- Mechanical and Electrical Engineering CollegeHainan University Haikou Hainan P. R. China
| | - Yongxin Song
- Department of Marine EngineeringDalian Maritime University Dalian P. R. China
| | - Sang Woo Joo
- School of Mechanical EngineeringYeungnam University Gyongsan Korea
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14
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Song Y, Feng A, Liu Z, Li D. Zeta potentials of PDMS surfaces modified with poly(ethylene glycol) by physisorption. Electrophoresis 2019; 41:761-768. [DOI: 10.1002/elps.201900246] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Revised: 08/14/2019] [Accepted: 08/20/2019] [Indexed: 12/15/2022]
Affiliation(s)
- Yongxin Song
- Department of Marine EngineeringDalian Maritime University Dalian P. R. China
| | - Angran Feng
- China Classification Society Guangzhou Branch Guangzhou P. R. China
| | - Zhijian Liu
- Department of Marine EngineeringDalian Maritime University Dalian P. R. China
| | - Dongqing Li
- Department of Mechanical and Mechatronics EngineeringUniversity of Waterloo Waterloo Canada
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15
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Microfluidics Chip for Directional Solvent Extraction Desalination of Seawater. Sci Rep 2019; 9:12576. [PMID: 31467344 PMCID: PMC6715649 DOI: 10.1038/s41598-019-49071-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Accepted: 08/16/2019] [Indexed: 11/12/2022] Open
Abstract
Directional solvent extraction is one of the promising membrane-less seawater desalination method. This technique was not extensively investigated due the poor mixing and separation performances of its bench-scale system. It is believed that, overcoming these drawbacks is possible now with the rapid development of microfluidics technology that enabled high-precession micro mixing and separation. This work presents microfluidics chip for extracting and separating salt from seawater. The chip was designed with two sections for extraction and separation. In both sections, the liquids were separated using capillary channels perpendicular to the main stream. The main channels were designed to be 400 µm in width and 100 µm in height. Two streams inlets were introduced through a Y-junction containing octanoic acid as the organic phase and saltwater as the aqueous phase. The desalination performance was investigated at four different temperatures and five different solvent flow rates. Water product salinity was recorded to be as low as 0.056% (w/w) at 60 °C and 40 mL/h. A maximum water yield of 5.2% was achieved at 65 °C and 40 mL/h with a very low solvent residual (70 ppm). The chip mass transfer efficiency was recorded to be as high as 68% under similar conditions. The fabricated microfluidic desalination system showed a significant improvement in terms of water yield and separation efficiency over the conventional macroscale. The high performance of this microsystem resulted from its ability to achieve a high mixing efficiency and separate phases selectively and that will provide a good platform in the near future to develop small desalination kits for personal use.
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16
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Ji X, Zhou T, Deng Y, Shi L, Zhang X, Woo Joo S. A new droplet breakup phenomenon in electrokinetic flow through a microchannel constriction. Electrophoresis 2019; 41:758-760. [PMID: 31177552 DOI: 10.1002/elps.201900140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 05/17/2019] [Accepted: 05/31/2019] [Indexed: 11/07/2022]
Abstract
A completely new droplet breakup phenomenon is reported for droplets passing through a constriction in an electrokinetic flow. The breakup occurs during the droplet shape recovery process past the constriction throat by the interplay of the dielectrophoretic stress release and the interface energy for droplets with smaller permittivity than that of the ambient fluid. There are conditions for constriction ratios and droplet size that the droplet breakup occurs. The numerical predictions provided here require experimental verification, and then can give rise to a novel microfluidic device design with novel droplet manipulations.
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Affiliation(s)
- Xiang Ji
- Mechanical and Electrical Engineering College, Hainan University, Haikou, Hainan, P. R. China
| | - Teng Zhou
- Mechanical and Electrical Engineering College, Hainan University, Haikou, Hainan, P. R. China
| | - Yongbo Deng
- Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP), Chinese Academy of Science, Changchun, Jilin, P. R. China
| | - Liuyong Shi
- Mechanical and Electrical Engineering College, Hainan University, Haikou, Hainan, P. R. China
| | - Xianman Zhang
- Mechanical and Electrical Engineering College, Hainan University, Haikou, Hainan, P. R. China
| | - Sang Woo Joo
- School of Mechanical Engineering, Yeungnam University, Gyongsan, South Korea
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17
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Zhou T, Ji X, Shi L, Zhang X, Deng Y, Joo SW. Dielectrophoretic choking phenomenon in a converging-diverging microchannel for Janus particles. Electrophoresis 2018; 40:993-999. [PMID: 30371959 DOI: 10.1002/elps.201800368] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 10/22/2018] [Accepted: 10/24/2018] [Indexed: 11/10/2022]
Abstract
The dielectrophoretic (DEP) choking phenomenon is revisited for Janus particles that are transported electrokinetically through a microchannel constriction by a direct-current (DC) electric field. The negative DEP force that would block a particle with a diameter significantly smaller than that of the constriction at its inlet is seen to be relaxed by the rotation of the Janus particle in a direction that minimizes the magnitude of the DEP force. This allows the particle to pass through the constriction completely. An arbitrary Lagrangian-Eulerian (ALE) numerical method is used to solve the nonlinearly coupled electric field, flow field, and moving particle, and the DEP force is calculated by the Maxwell stress tensor (MST) method. The results show how Janus particles with non-uniform surface potentials overcome the DEP force and present new conditions for the DEP choking by a parametric study. Particle transportation through microchannel constrictions is ubiquitous, and particle surface properties are more likely to be non-uniform than not in practical applications. This study provides new insights of importance for non-uniform particles transported electrokinetically in a microdevice.
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Affiliation(s)
- Teng Zhou
- Mechanical and Electrical Engineering College, Hainan University, Haikou, Hainan, P. R. China
| | - Xiang Ji
- Mechanical and Electrical Engineering College, Hainan University, Haikou, Hainan, P. R. China
| | - Liuyong Shi
- Mechanical and Electrical Engineering College, Hainan University, Haikou, Hainan, P. R. China
| | - Xianman Zhang
- Mechanical and Electrical Engineering College, Hainan University, Haikou, Hainan, P. R. China
| | - Yongbo Deng
- Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP), Chinese Academy of Science, Changchun, Jilin, P. R. China
| | - Sang Woo Joo
- School of Mechanical Engineering, Yeungnam University, Gyongsan, Korea
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18
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Ji X, Xu L, Zhou T, Shi L, Deng Y, Li J. Numerical Investigation of DC Dielectrophoretic Deformable Particle⁻Particle Interactions and Assembly. MICROMACHINES 2018; 9:E260. [PMID: 30424193 PMCID: PMC6187325 DOI: 10.3390/mi9060260] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2018] [Revised: 05/20/2018] [Accepted: 05/22/2018] [Indexed: 12/26/2022]
Abstract
In a non-uniform electric field, the surface charge of the deformable particle is polarized, resulting in the dielectrophoretic force acting on the surface of the particle, which causes the electrophoresis. Due to dielectrophoretic force, the two deformable particles approach each other, and distort the flow field between them, which cause the hydrodynamic force correspondingly. The dielectrophoresis (DEP) force and the hydrodynamic force together form the net force acting on the particles. In this paper, based on a thin electric double layer (EDL) assumption, we developed a mathematical model under the arbitrary Lagrangian⁻Eulerian (ALE) numerical approach method to simulate the flow field, electric field, and deformable particles simultaneously. Simulation results show that, when two deformable particles' distances are in a certain range, no matter the initial position of the two particles immersed in the fluid field, the particles will eventually form a particle⁻particle chain parallel to the direction of the electric field. In actual experiments, the biological cells used are deformable. Compared with the previous study on the DEP motion of the rigid particles, the research conclusion of this paper provides a more rigorous reference for the design of microfluidics.
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Affiliation(s)
- Xiang Ji
- Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, China.
| | - Li Xu
- School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430070, China.
| | - Teng Zhou
- Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, China.
| | - Liuyong Shi
- Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, China.
| | - Yongbo Deng
- State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP), Chinese Academy of Sciences, Changchun 130033, China.
| | - Jie Li
- School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430070, China.
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Wang H, Shi L, Zhou T, Xu C, Deng Y. A novel passive micromixer with modified asymmetric lateral wall structures. ASIA-PAC J CHEM ENG 2018. [DOI: 10.1002/apj.2202] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Hanlin Wang
- Mechanical and Electrical Engineering College; Hainan University; Haikou 570228 Hainan China
| | - Liuyong Shi
- Mechanical and Electrical Engineering College; Hainan University; Haikou 570228 Hainan China
| | - Teng Zhou
- Mechanical and Electrical Engineering College; Hainan University; Haikou 570228 Hainan China
| | - Chao Xu
- State Key Laboratory of Industrial Control Technology and Institute of Cyber-Systems and Control; Zhejiang University; Hangzhou 310027 Zhejiang China
| | - Yongbo Deng
- State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP); Chinese Academy of Science; Changchun 130033 Jilin China
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