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Hu S, Wang Y, Wang Y, Chen X, Tong R. Dielectrophoretic separation and purification: From colloid and biological particles to droplets. J Chromatogr A 2024; 1731:465155. [PMID: 39032216 DOI: 10.1016/j.chroma.2024.465155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 07/06/2024] [Accepted: 07/08/2024] [Indexed: 07/22/2024]
Abstract
It is indispensable to realize the high level of purification and separation, so that objective particles, such as malignant cells, harmful bacteria, and special proteins or biological molecules, could satisfy the high precise measurement in the pharmaceutical analysis, clinical diagnosis, targeted therapy, and food defense. In addition, this could reveal the intrinsic nature and evolution mechanisms of individual biological variations. Consequently, many techniques related to optical tweezers, microfluidics, acoustophoresis, and electrokinetics can be broadly used to achieve micro- and nano-scale particle separations. Dielectrophoresis (DEP) has been used for various manipulation, concentration, transport, and separation processes of biological particles owing to its early development, mature theory, low cost, and high throughput. Although numerous reviews have discussed the biological applications of DEP techniques, comprehensive descriptions of micro- and nano-scale particle separations feature less frequently in the literature. Therefore, this review summarizes the current state of particle separation attention to relevant technological developments and innovation, including theoretical simulation, microchannel structure, electrode material, pattern and its layout. Moreover, a brief overview of separation applications using DEP in combination with other technologies is also provided. Finally, conclusions, future guidelines, and suggestions for potential promotion are highlighted.
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Affiliation(s)
- Sheng Hu
- College of Information Science and Engineering, Northeastern University, Shenyang, China; Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology, Qinhuangdao, 066004, China.
| | - Yangcheng Wang
- College of Information Science and Engineering, Northeastern University, Shenyang, China
| | - Yanzhe Wang
- Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology, Qinhuangdao, 066004, China
| | - Xiaoming Chen
- College of Information Science and Engineering, Northeastern University, Shenyang, China; Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology, Qinhuangdao, 066004, China
| | - Ruijie Tong
- College of Information Science and Engineering, Northeastern University, Shenyang, China; Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology, Qinhuangdao, 066004, China
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Zhao K, Yao J, Wei Y, Kong D, Wang J. Numerical studies of manipulation and separation of microparticles in ODEP-based microfluidic chips. Electrophoresis 2024. [PMID: 38419136 DOI: 10.1002/elps.202300265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 01/29/2024] [Accepted: 02/01/2024] [Indexed: 03/02/2024]
Abstract
A novel optical-induced dielectrophoresis (ODEP) method employing a pressure-driven flow for the continuous separation of microparticles is presented in this study. By applying alternate current electric field on conductive indium tin oxide substrate and projecting the light geometry into the photoconductive layer, an inhomogeneous electric field is locally induced. The particles experience the dielectrophoretic force when passing through the lighting area, where the strongest electrical field gradient exists. By optimizing the structure of the lighting pattern, a stronger nonuniform electric field gradient is generated which predicts the separation of 1 and 3 µm polystyrene particles. Moreover, the effects of key parameters, including the light pattern geometry, applied voltage, and flow rate, were investigated in this study, leading to the successful sorting of 700 nm and 1 µm particles. To further examine the separation sensitivity and practicability of the proposed ODEP microfluidic method, the isolation of two different types of circulating tumor cells from T-cells and red blood cells are demonstrated, providing a novel method for the manipulation and separation of microparticles and nanoparticles.
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Affiliation(s)
- Kai Zhao
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, Dalian, P. R. China
- Department of Information Science and Technology, Dalian Maritime University, Dalian, P. R. China
| | - Junzhu Yao
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, Dalian, P. R. China
- Department of Information Science and Technology, Dalian Maritime University, Dalian, P. R. China
| | - Yunman Wei
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, Dalian, P. R. China
- Department of Information Science and Technology, Dalian Maritime University, Dalian, P. R. China
| | - Dejian Kong
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, Dalian, P. R. China
- Department of Information Science and Technology, Dalian Maritime University, Dalian, P. R. China
| | - Junsheng Wang
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, Dalian, P. R. China
- Department of Information Science and Technology, Dalian Maritime University, Dalian, P. R. China
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Banerjee U, Gunjan MR, Mitra SK. Directional Manipulation of Drops and Solids on a Magneto-Responsive Slippery Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024. [PMID: 38306611 DOI: 10.1021/acs.langmuir.3c03515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2024]
Abstract
The cloaking of the droplet and solid spheres by a thin ferrofluid layer forms a ferrofluid-wetting ridge, enabling the magnet-assisted directional manipulation of droplets and solid spheres on the magneto-responsive slippery surface. Understanding the interplay of various forces governing motion unravels the manipulation mechanism. The transportation characteristics of droplets and solid spheres on such surfaces enable their controlled manipulation in multiple applications. Here, we prepare magneto-responsive slippery surfaces by using superhydrophobic coatings on glass slides, creating a porous network and impregnating them with ferrofluid. Using a permanent magnet (and its translation) in the proximity of these surfaces, we manipulate the motion of liquid drops and solid spheres. Upon dispensing the droplet on the magneto-responsive slippery surface, the droplet is cloaked by a thin ferrofluid layer and forms a ferrofluid wetting ridge. Incorporating the magnetic field creates a magnetic-nanoparticle-rich zone surrounding the ferrofluid ridge. Thereafter, the motion of the magnet gives rise to the movement of the droplet. We found that the interplay of the magnetic force and viscous drag leads to the magnetic manipulation of droplets in a controlled fashion up to a certain magnet speed. Increasing the magnet speed further results in the uncontrolled motion of the droplet, where the droplet cannot follow the magnet trajectory. Moreover, we delineate multifunctional droplet manipulations, such as trapping, pendant droplet manipulation, coalescence, and microchemical reactions, which have wide engineering applications.
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Affiliation(s)
- Utsab Banerjee
- Micro & Nano-Scale Transport Laboratory, Waterloo Institute for Nanotechnology, Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
| | - Madhu Ranjan Gunjan
- Micro & Nano-Scale Transport Laboratory, Waterloo Institute for Nanotechnology, Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
| | - Sushanta K Mitra
- Micro & Nano-Scale Transport Laboratory, Waterloo Institute for Nanotechnology, Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
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Zhao K, Zhao X, Gao T, Li X, Wang G, Pan X, Wang J. Dielectrophoresis-assisted removal of Cd and Cu heavy metal ions by using Chlorella microalgae. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 334:122110. [PMID: 37390915 DOI: 10.1016/j.envpol.2023.122110] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Revised: 06/13/2023] [Accepted: 06/24/2023] [Indexed: 07/02/2023]
Abstract
A novel dielectrophoresis (DEP)-assisted device for the bioremediation of heavy metal ions by using Chlorella microalgae is presented in this paper. To generate the DEP forces, pairs of electrode mesh were inserted in the DEP-assisted device. By applying DC electric field via the electrodes, the inhomogeneous electric field gradient is induced and the strongest non-uniform electric field exists near the mesh cross-corner. After the adsorption of Cd and Cu heavy metal ions by Chlorella, the Chlorella chain were trapped along the vicinity of the electrode mesh. Then, the effects of Chlorella concentration on the adsorption of heavy metal ions, and the applied voltage and electrode mesh size on the removal of Chlorella are conducted. In the co-existing Cd and Cu solutions, the individual adsorption ratio of Cd and Cu reaches as high as approximately 96% and 98%, respectively, showing excellent bioremediation capability of multiple heavy metal ions in wastewater. By adjusting the applied electric voltage and the mesh size, the Chlorella adsorbed with Cd and Cu are captured by negative DC-DEP effects and the removal ratio of Chlorella reach an average of 97%, providing a method for the removal of multiple heavy metal ions in wastewater by using Chlorella microalgae.
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Affiliation(s)
- Kai Zhao
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, 116026 Dalian, China; Department of Information Science and Technology, Dalian Maritime University, 116026, Dalian, China
| | - Xun Zhao
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, 116026 Dalian, China; Department of Information Science and Technology, Dalian Maritime University, 116026, Dalian, China
| | - Tianbo Gao
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, 116026 Dalian, China; Department of Information Science and Technology, Dalian Maritime University, 116026, Dalian, China
| | - Xuan Li
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, 116026 Dalian, China; Department of Information Science and Technology, Dalian Maritime University, 116026, Dalian, China
| | - Guanqi Wang
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, 116026 Dalian, China; Department of Information Science and Technology, Dalian Maritime University, 116026, Dalian, China
| | - Xinxiang Pan
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, 116026 Dalian, China; Department of Maritime, Guangdong Ocean University, 524000, Zhanjiang, China
| | - Junsheng Wang
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, 116026 Dalian, China; Department of Information Science and Technology, Dalian Maritime University, 116026, Dalian, China.
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Hewlin RL, Edwards M. Continuous Flow Separation of Red Blood Cells and Platelets in a Y-Microfluidic Channel Device with Saw-Tooth Profile Electrodes via Low Voltage Dielectrophoresis. Curr Issues Mol Biol 2023; 45:3048-3067. [PMID: 37185724 PMCID: PMC10136998 DOI: 10.3390/cimb45040200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2023] [Revised: 03/28/2023] [Accepted: 03/30/2023] [Indexed: 04/08/2023] Open
Abstract
Cell counting and sorting is a vital step in the purification process within the area of biomedical research. It has been widely reported and accepted that the use of hydrodynamic focusing in conjunction with the application of a dielectrophoretic (DEP) force allows efficient separation of biological entities such as platelets from red blood cell (RBC) samples due to their size difference. This paper presents computational results of a multiphysics simulation modelling study on evaluating continuous separation of RBCs and platelets in a microfluidic device design with saw-tooth profile electrodes via DEP. The theoretical cell particle trajectory, particle cell counting, and particle separation distance study results reported in this work were predicted using COMSOL v6.0 Multiphysics simulation software. To validate the numerical model used in this work for the reported device design, we first developed a simple y-channel microfluidic device with square “in fluid” electrodes similar to the design reported previously in other works. We then compared the obtained simulation results for the simple y-channel device with the square in fluid electrodes to the reported experimental work done on this simple design which resulted in 98% agreement. The design reported in this work is an improvement over existing designs in that it can perform rapid separation of RBCs (estimated 99% purification) and platelets in a total time of 6–7 s at a minimum voltage setting of 1 V and at a minimum frequency of 1 Hz. The threshold for efficient separation of cells ends at 1000 kHz for a 1 V setting. The saw-tooth electrode profile appears to be an improvement over existing designs in that the sharp corners reduced the required horizontal distance needed for separation to occur and contributed to a non-uniform DEP electric field. The results of this simulation study further suggest that this DEP separation technique may potentially be applied to improve the efficiency of separation processes of biological sample scenarios and simultaneously increase the accuracy of diagnostic processes via cell counting and sorting.
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Affiliation(s)
- Rodward L. Hewlin
- Center for Biomedical Engineering and Science (CBES), Department of Engineering Technology and Construction Management (ETCM), University of North Carolina at Charlotte, Charlotte, NC 28223, USA
- Applied Energy and Electromechanical Systems (AEES), Department of Engineering Technology and Construction Management (ETCM), University of North Carolina at Charlotte, Charlotte, NC 28223, USA
| | - Maegan Edwards
- Applied Energy and Electromechanical Systems (AEES), Department of Engineering Technology and Construction Management (ETCM), University of North Carolina at Charlotte, Charlotte, NC 28223, USA
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Zhao K, Hu M, van Baalen C, Alvarez L, Isa L. Sorting of heterogeneous colloids by AC-dielectrophoretic forces in a microfluidic chip with asymmetric orifices. J Colloid Interface Sci 2023; 634:921-929. [PMID: 36571855 DOI: 10.1016/j.jcis.2022.12.108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 12/12/2022] [Accepted: 12/19/2022] [Indexed: 12/24/2022]
Abstract
HYPOTHESIS The synthesis of compositionally heterogeneous particles is central to the development of complex colloidal units for self-assembly and self-propulsion. Yet, as the complexity of particles grows, synthesis becomes more prone to "errors". We hypothesize that alternating-current dielectrophoretic forces can efficiently sort Janus particles, as a function of patch size and material, and colloidal dumbbells by size. EXPERIMENTS We prepared Janus particles with different patch size and material by physical vapor deposition and colloidal dumbbells via capillarity-assisted particle assembly. We then performed sorting experiments in a microfluidic chip comprising electrodes with asymmetric orifices, specifically exploiting the dielectric contrast between different portions of the particles or their size difference to steer them towards different outlets. FINDINGS We calculated that the DEP force for Janus particles may switch from positive to negative as a function of composition at a critical AC frequency, thus enabling sorting different particles crossing the electrodes' region. The predictions are confirmed by optical microscopy experiments. We also show that intact and "broken" dumbbells can be simply separated as they experience different DEP forces. The integration of multiple asymmetric orifices leads a larger zone with high field gradient to increase separation efficiency and makes it a promising tool to select precise particle populations, isolating fractions with narrowly distributed characteristics.
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Affiliation(s)
- Kai Zhao
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Department of Information Science and Technology, Dalian Maritime University, 116026 Dalian, China; Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland.
| | - Minghan Hu
- Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
| | - Carolina van Baalen
- Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
| | - Laura Alvarez
- Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
| | - Lucio Isa
- Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland.
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Gao T, Zhao K, Zhang J, Zhang K. DC-Dielectrophoretic Manipulation and Isolation of Microplastic Particle-Treated Microalgae Cells in Asymmetric-Orifice-Based Microfluidic Chip. MICROMACHINES 2023; 14:229. [PMID: 36677290 PMCID: PMC9865771 DOI: 10.3390/mi14010229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 01/10/2023] [Accepted: 01/13/2023] [Indexed: 06/17/2023]
Abstract
A novel direct-current dielectrophoretic (DC-DEP) method is proposed for the manipulation and isolation of microplastic particle (MP)-treated microalgae cells according to their dielectric properties in a microfluidic chip. The lateral migration and trajectory of the microalgae cells were investigated. To induce stronger DC-DEP effects, a non-homogeneous electric-field gradient was generated by applying the DC electric voltages through triple pairs of asymmetric orifices with three small orifices and one large orifice located on the opposite microchannel wall across the whole channel, leading to the enhanced magnitude of the non-uniform electric-field gradient and effective dielectrophoretic area. The effects of the applied voltage, the polystyrene (PS) adsorption coverage, and thickness on the DC-DEP behaviors and migration were numerically investigated, and it was found that the effect of the PS adsorption thickness of the Chlorella cells on the DC-DEP behaviors can be neglected, but the effect on their trajectory shifts cannot. In this way, the separation of 3 µm and 6 µm Chlorella coated with 100% PS particles and the isolation of the Chlorella cells from those coated with various coverages and thicknesses of PS particles was successfully achieved, providing a promising method for the isolation of microalgae cells and the removal of undesired cells from a target suspension.
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Affiliation(s)
- Tianbo Gao
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Department of Information Science and Technology, Dalian Maritime University, Dalian 116026, China
| | - Kai Zhao
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Department of Information Science and Technology, Dalian Maritime University, Dalian 116026, China
| | - Jiaqi Zhang
- 2020 X-Lab, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
| | - Kaihuan Zhang
- 2020 X-Lab, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
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Zhao K, Zhao P, Dong J, Wei Y, Chen B, Wang Y, Pan X, Wang J. Implementation of an Integrated Dielectrophoretic and Magnetophoretic Microfluidic Chip for CTC Isolation. BIOSENSORS 2022; 12:bios12090757. [PMID: 36140142 PMCID: PMC9496341 DOI: 10.3390/bios12090757] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 09/07/2022] [Accepted: 09/13/2022] [Indexed: 11/16/2022]
Abstract
Identification of circulating tumor cells (CTCs) from a majority of various cell pools has been an appealing topic for diagnostic purposes. This study numerically demonstrates the isolation of CTCs from blood cells by the combination of dielectrophoresis and magnetophoresis in a microfluidic chip. Taking advantage of the label-free property, the separation of red blood cells, platelets, T cells, HT-29, and MDA-231 was conducted in the microchannel. By using the ferromagnet structure with double segments and a relatively shorter distance in between, a strong gradient of the magnetic field, i.e., sufficiently large MAP forces acting on the cells, can be generated, leading to a high separation resolution. In order to generate strong DEP forces, the non-uniform electric field gradient is induced by applying the electric voltage through the microchannel across a pair of asymmetric orifices, i.e., a small orifice and a large orifice on the opposite wall of the channel sides. The distribution of the gradient of the magnetic field near the edge of ferromagnet segments, the gradient of the non-uniform electric field in the vicinity of the asymmetric orifices, and the flow field were investigated. In this numerical simulation, the effects of the ferromagnet structure on the magnetic field, the flow rate, as well as the strength of the electric field on their combined magnetophoretic and dielectrophoretic behaviors and trajectories are systemically studied. The simulation results demonstrate the potential of both property- and size-based cell isolation in the microfluidic device by implementing magnetophoresis and dielectrophoresis.
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Affiliation(s)
- Kai Zhao
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, Dalian 116026, China
- Department of Information Science and Technology, Dalian Maritime University, Dalian 116026, China
| | - Penglu Zhao
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, Dalian 116026, China
- Department of Information Science and Technology, Dalian Maritime University, Dalian 116026, China
| | - Jianhong Dong
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, Dalian 116026, China
- Department of Information Science and Technology, Dalian Maritime University, Dalian 116026, China
| | - Yunman Wei
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, Dalian 116026, China
- Department of Information Science and Technology, Dalian Maritime University, Dalian 116026, China
| | - Bin Chen
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, Dalian 116026, China
- Department of Information Science and Technology, Dalian Maritime University, Dalian 116026, China
| | - Yanjuan Wang
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, Dalian 116026, China
- Software Institute, Dalian Jiaotong University, Dalian 116028, China
| | - Xinxiang Pan
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, Dalian 116026, China
- Department of Maritime, Guangdong Ocean University, Zhanjiang 524000, China
| | - Junsheng Wang
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, Dalian 116026, China
- Department of Information Science and Technology, Dalian Maritime University, Dalian 116026, China
- Correspondence:
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Lu H, Pan Z, Miao Z, Xu X, Wu S, Liu Y, Wang H, Yang Q. Combination of electric field and medium coalescence for enhanced demulsification of oil-in-water emulsion. CHEMICAL ENGINEERING JOURNAL ADVANCES 2021. [DOI: 10.1016/j.ceja.2021.100103] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Zhao K, Larasati, Duncker BP, Li D. Continuous Cell Characterization and Separation by Microfluidic Alternating Current Dielectrophoresis. Anal Chem 2019; 91:6304-6314. [DOI: 10.1021/acs.analchem.9b01104] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Kai Zhao
- Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1
| | - Larasati
- Department of Biology, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1
| | - Bernard P. Duncker
- Department of Biology, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1
| | - Dongqing Li
- Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1
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Zhang J, Song Y, Li D. Electrokinetic motion of a micro oil droplet under a glass slide. Electrophoresis 2019; 40:1034-1040. [DOI: 10.1002/elps.201800406] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 11/27/2018] [Accepted: 12/10/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Junyan Zhang
- Department of Marine EngineeringDalian Maritime University Dalian P. R. China
| | - Yongxin Song
- Department of Marine EngineeringDalian Maritime University Dalian P. R. China
| | - Dongqing Li
- Department of Mechanical and Mechatronics EngineeringUniversity of Waterloo Waterloo ON Canada
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Zhao K, Li D. Tunable Droplet Manipulation and Characterization by ac-DEP. ACS APPLIED MATERIALS & INTERFACES 2018; 10:36572-36581. [PMID: 30264985 DOI: 10.1021/acsami.8b14430] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A novel ac-dielectrophoretic (DEP) device for tunable manipulation and characterization of particles and droplets is presented in this work. To induce DEP forces, the ac electric field is applied via two embedded microelectrodes to generate a local nonuniform electric field perpendicular to the channel length through a pair of asymmetric orifices on the opposite microchannel walls. The droplets experience the DEP effects only when passing through the vicinity of the small orifice, where the strongest gradient of the nonuniform electric field exists. In this study, the ac-DEP manipulation of the particles in the microchannel under different strengths of electrical field was demonstrated first. Then, the separation of particles by size, separation of mixtures of ionic liquid (IL) droplets and oil droplets with the same size by types, and movement of the particles and IL droplets with different frequencies of the applied ac electric field were investigated, respectively. The experimental results match well with the theoretical simulation. In addition, the lateral migration of an IL droplet as a function of the ac frequency was measured, which shows a trend similar to the corresponding Clausius-Mossotti factor. The experimental results demonstrate that with this method, the separation of target particles/droplets with specific size and type can be accomplished by simply adjusting the strength and the frequency of the ac field applied to the microchannels. This paper, for the first time, measured the ac-DEP lateral migration of the particles and IL-in-water emulsion droplets varying with the frequency of the applied ac electric field in the microfluidic chip, providing a method to identify the critical frequency of the droplet and the fingerprint to characterize the droplet.
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Affiliation(s)
- Kai Zhao
- Department of Mechanical and Mechatronics Engineering , University of Waterloo , Waterloo , Ontario N2L 3G1 , Canada
| | - Dongqing Li
- Department of Mechanical and Mechatronics Engineering , University of Waterloo , Waterloo , Ontario N2L 3G1 , Canada
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Zhao K, Li D. Direct current dielectrophoretic manipulation of the ionic liquid droplets in water. J Chromatogr A 2018; 1558:96-106. [DOI: 10.1016/j.chroma.2018.05.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2018] [Revised: 05/02/2018] [Accepted: 05/08/2018] [Indexed: 10/16/2022]
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