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Mehta SK, Mondal PK. AC Electrothermal Effect Promotes Enhanced Solute Mixing in a Wavy Microchannel. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:16797-16806. [PMID: 37882459 DOI: 10.1021/acs.langmuir.3c02150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2023]
Abstract
For liquids used in biological applications, a smaller diffusion coefficient results in a longer mixing time. We discuss, in this endeavor, the promising potential of the AC electrothermal (ACET) effect toward modulating enhanced mixing of electrolytic liquids with higher convective strength in a novel wavy micromixer. To this end, we develop a modeling framework and numerically solve the pertinent transport equations in a three-dimensional (3D) configuration numerically. By benchmarking the developed modeling framework with the experimental results available in this paradigm, we aptly demonstrate the maximum temperature rise, flow topology, species concentration field, and mixing efficiency in the proposed configuration for a set of parameters pertinent to this analysis. We find that the maximum temperature increase in the wavy micromixer, owing to the electrothermal effect, is less than 10 K even for the higher strength of the applied voltage, implying nondegradation of biological substances within the liquid sample. We report that the formation of significant lateral flow closer to the electrodes leads to a highly three-dimensional ACET flow field, which has a significant impact on the mixing efficiency for the range of diffusive Peclet numbers considered. We also report that the wave amplitude of the mixer, when intervening with the diffusive Peclet number, strongly impacts the mixing efficiency. As witnessed in this endeavor, for the smaller diffusive Peclet number, the mixing efficiency increases with amplitude, while the effect becomes the opposite for the higher Peclet number. The results of this study seem to provide an adequate basis for the design of a novel micromixer intended for enhanced solute mixing in realistic microfluidic applications.
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Affiliation(s)
- Sumit Kumar Mehta
- Microfluidics and Microscale Transport Processes Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Pranab Kumar Mondal
- Microfluidics and Microscale Transport Processes Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India
- School of Agro and Rural Technology, Indian Institute of Technology Guwahati, Guwahati 781039, India
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2
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Wang X, Liu Z, Wang B, Cai Y, Song Q. An overview on state-of-art of micromixer designs, characteristics and applications. Anal Chim Acta 2023; 1279:341685. [PMID: 37827660 DOI: 10.1016/j.aca.2023.341685] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 07/31/2023] [Accepted: 08/01/2023] [Indexed: 10/14/2023]
Abstract
Micromixers are characterized based on characteristics such as excellent mixing efficiency, low reagent cost and flexible controllability compared with conventional reactors in terms of macro size. A variety of designs and applications of micromixers have been proposed. The focus of current reviews is restricted to micromixer structures. Each type of micromixer has characteristics corresponding to its structure, which determines the suitable application areas. This paper provides an overview connecting micromixer designs and their applications. First, the typical designs and mixing mechanisms of both passive and active micromixers are summarized. Then, application cases of micromixers, including chemical, biological and medical applications, are presented. The characteristics, including the advantages and restrictions of different micromixers, are discussed. Finally, the future perspective of micromixer design is proposed. It is predictable that micromixers will have widespread applications by integrating two or more different mixing methods together. This review would be beneficial to guide the design of micromixers applied for specific purposes.
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Affiliation(s)
- Xin Wang
- School of Mechanical Engineering, Shandong University, Jinan 250061, Shandong, China; Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE/Key National Demonstration Center for Experimental Mechanical Engineering Education, Jinan 250061, Shandong, China
| | - Zhanqiang Liu
- School of Mechanical Engineering, Shandong University, Jinan 250061, Shandong, China; Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE/Key National Demonstration Center for Experimental Mechanical Engineering Education, Jinan 250061, Shandong, China.
| | - Bing Wang
- School of Mechanical Engineering, Shandong University, Jinan 250061, Shandong, China; Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE/Key National Demonstration Center for Experimental Mechanical Engineering Education, Jinan 250061, Shandong, China
| | - Yukui Cai
- School of Mechanical Engineering, Shandong University, Jinan 250061, Shandong, China; Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE/Key National Demonstration Center for Experimental Mechanical Engineering Education, Jinan 250061, Shandong, China
| | - Qinghua Song
- School of Mechanical Engineering, Shandong University, Jinan 250061, Shandong, China; Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE/Key National Demonstration Center for Experimental Mechanical Engineering Education, Jinan 250061, Shandong, China
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3
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Pan S, You R, Chen X, Pan W, Li Q, Chen X, Pang W, Duan X. Regulating Biomolecular Surface Interactions Using Tunable Acoustic Streaming. ACS Sens 2023; 8:3458-3467. [PMID: 37639526 DOI: 10.1021/acssensors.3c00982] [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] [Indexed: 08/31/2023]
Abstract
Diffusion limitations and nonspecific surface absorption are great challenges for developing micro-/nanoscale affinity biosensors. There are very limited approaches that can solve these issues at the same time. Here, an acoustic streaming approach enabled by a gigahertz (GHz) resonator is presented to promote mass transfer of analytes through the jet mode and biofouling removal through the shear mode, which can be switched by tuning the deviation angle, α, between the resonator and the sensor. Simulations show that the jet mode (α ≤ 0) drives the analytes in the fluid toward the sensing surface, overcomes the diffusion limitation, and enhances the binding; while the shear mode (0 < α < π/4) provides a scouring action to remove the biofouling from the sensor. Experimental studies were performed by integrating this GHz resonator with optoelectronic sensing systems, where a 34-fold enhancement for the initial binding rate was obtained. Featuring high efficiency, controllability, and versatility, we believe that this GHz acoustic streaming approach holds promise for many kinds of biosensing systems as well as lab-on-chip systems.
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Affiliation(s)
- Shuting Pan
- State Key Laboratory of Precision Measuring Technology & Instruments, Tianjin University, Tianjin 300072, China
| | - Rui You
- State Key Laboratory of Precision Measuring Technology & Instruments, Tianjin University, Tianjin 300072, China
| | - Xian Chen
- State Key Laboratory of Precision Measuring Technology & Instruments, Tianjin University, Tianjin 300072, China
| | - Wenwei Pan
- State Key Laboratory of Precision Measuring Technology & Instruments, Tianjin University, Tianjin 300072, China
| | - Quanning Li
- State Key Laboratory of Precision Measuring Technology & Instruments, Tianjin University, Tianjin 300072, China
| | - Xuejiao Chen
- State Key Laboratory of Precision Measuring Technology & Instruments, Tianjin University, Tianjin 300072, China
| | - Wei Pang
- State Key Laboratory of Precision Measuring Technology & Instruments, Tianjin University, Tianjin 300072, China
| | - Xuexin Duan
- State Key Laboratory of Precision Measuring Technology & Instruments, Tianjin University, Tianjin 300072, China
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Draz MS, Uning K, Dupouy D, Gijs MAM. Efficient AC electrothermal flow (ACET) on-chip for enhanced immunoassays. LAB ON A CHIP 2023; 23:1637-1648. [PMID: 36644814 DOI: 10.1039/d2lc01147f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Biochemical reaction rates in microfluidic systems are known to be limited by the diffusional transport of reagents, leading often to lowered sensitivity and/or longer detection times in immunoassays. Several methods, including electrically powering electrodes to generate AC electrothermal flow (ACET) on-chip, have been adopted to enhance the mass transport of the reagents and improve microfluidic mixing. Here, we report a novel ACET electrode design concept for generating in-plane microfluidic mixing vortices that act over a large volume close to the reaction surface of interest. This is different from the traditional ACET parallel electrode design that provides rather local vertical mixing vortices directly above the electrodes. Both numerical simulation and experimental studies were performed to validate the new design. Moreover, numerical simulation was carried out to show the effects of experimental factors such as the reaction kinetics (association constant) and the reagent concentration on the ACET-enhanced surface-based assays. As a proof of concept, the new design for the ACET-enhanced immunoassays was used to improve the immunostaining signal of the HER2 (human epidermal growth factor receptor 2) cancer biomarker on breast cancer cells. Finally, the concept of scaling up the design has been validated by experiments (immunoassays on breast cancer cells for different ACET power and different assay times). In particular, we show that larger ACET in-plane designs can agitate and mix the fluid over large microfluidic volumes, which further enhances the immunoassay's output. We have achieved a 6-times enhancement in the assay signal with a 75% reduction in assay time.
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Affiliation(s)
- Muaz S Draz
- Laboratory of Microsystems 2, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
- Lunaphore Technologies SA, CH-1131 Tolochenaz, Switzerland
| | - Kevin Uning
- Laboratory of Microsystems 2, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
| | - Diego Dupouy
- Lunaphore Technologies SA, CH-1131 Tolochenaz, Switzerland
| | - Martin A M Gijs
- Laboratory of Microsystems 2, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
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Tavari T, Nazari M, Meamardoost S, Tamayol A, Samandari M. A systematic overview of electrode configuration in electric‐driven micropumps. Electrophoresis 2022; 43:1476-1520. [DOI: 10.1002/elps.202100317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 02/18/2022] [Accepted: 03/22/2022] [Indexed: 11/07/2022]
Affiliation(s)
- Tannaz Tavari
- Department of Mechanical and Mechatronics Engineering Shahrood University of Technology Shahrood Iran
| | - Mohsen Nazari
- Department of Mechanical and Mechatronics Engineering Shahrood University of Technology Shahrood Iran
| | - Saber Meamardoost
- Department of Chemical and Biological Engineering University at Buffalo Buffalo New York USA
| | - Ali Tamayol
- Department of Biomedical Engineering University of Connecticut Health Center Farmington Connecticut USA
| | - Mohamadmahdi Samandari
- Department of Biomedical Engineering University of Connecticut Health Center Farmington Connecticut USA
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Enhancement of Binding Kinetics on Affinity Substrates Using Asymmetric Electroosmotic Flow on a Sinusoidal Bipolar Electrode. MICROMACHINES 2022; 13:mi13020207. [PMID: 35208334 PMCID: PMC8878551 DOI: 10.3390/mi13020207] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 01/18/2022] [Accepted: 01/23/2022] [Indexed: 02/04/2023]
Abstract
In the context of the COVID-19 epidemic, enhancing the transport of analyte to a sensor surface is crucial for rapid detection of biomolecules since common conditions, including low diffusion coefficients, cause inordinately long detection times. Integrated microfluidic immunoassay chips are receiving increasing attention for their low sample volume and fast response time. We herein take advantage of asymmetric ICEO flow at a bipolar sinusoidal electrode to improve the rate of antibody binding to the reaction surface based on finite element modeling. Three different microfluidic cavities are proposed by changing the positions of the surface reaction area. We further investigate the relationship between binding enhancement and reaction surface positions, Damkohler number, and the voltage and frequency of the AC signal applied to the driving electrodes. Furthermore, the influence of the AC signal applied to the sinusoidal bipolar electrode on antigen–antibody-binding performance is studied in detail. Above all, the simulation results demonstrate that the microfluidic immune-sensor with a sinusoidal bipolar electrode could not only significantly improve the heterogeneous immunoassays but also enable efficient enhancement of assays in a selected reaction region within the micro-cavity, providing a promising approach to a variety of immunoassay applications, such as medical diagnostics and environmental and food monitoring.
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Song M, Lin X, Peng Z, Zhang M, Wu J. Enhancing affinity-based electroanalytical biosensors by integrated AC electrokinetic enrichment-A mini review. Electrophoresis 2021; 43:201-211. [PMID: 34453857 DOI: 10.1002/elps.202100168] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 08/03/2021] [Accepted: 08/20/2021] [Indexed: 11/09/2022]
Abstract
Biosensors play a central role in moving diagnostics to being on-site or decentralized. Affinity biosensor, an important category of biosensors, has important applications in clinical diagnosis, pharmaceuticals, immunology, and other fields. Affinity biosensors rely on specific binding between target analytes and biological ligands such as antibodies, nucleic acids, or other receptors to generate measurable signals. Oftentimes the target analytes in practical samples are of low abundance in a complex matrix. Traditional affinity biosensors mainly rely on random diffusion of analytes in solution to conjugate with biorecognition elements on the sensor surface of electrodes. The process may take hours or even days, which is not conducive to rapid and sensitive detection of biosensors. Therefore, it is strongly desired to incorporate an enrichment mechanism for target analytes into biosensor-based detection. AC electrokinetic (ACEK) effect can realize rapid enrichment of analytes by application of AC electric fields, which holds great promise for achieving high sensitivity, low detection limit, and rapid turnaround. This article reviews the studies of affinity biosensors integrated with ACEK enrichment in the past decade, and summarizes the latest detection methods, detection devices and applications, hoping to provide some insights and references for researchers in related fields.
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Affiliation(s)
- Min Song
- Key Laboratory of Optoelectronic Technology and Systems of Ministry of Education of China, Chongqing University, Chongqing, P. R. China
| | - Xiaogang Lin
- Key Laboratory of Optoelectronic Technology and Systems of Ministry of Education of China, Chongqing University, Chongqing, P. R. China
| | - Zhijia Peng
- Key Laboratory of Optoelectronic Technology and Systems of Ministry of Education of China, Chongqing University, Chongqing, P. R. China
| | - Maoxiao Zhang
- Key Laboratory of Optoelectronic Technology and Systems of Ministry of Education of China, Chongqing University, Chongqing, P. R. China
| | - Jayne Wu
- Department of Electrical Engineering and Computer Science, The University of Tennessee, Knoxville, Tennessee, USA
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Analysis of Temperature-Jump Boundary Conditions on Heat Transfer for Heterogeneous Microfluidic Immunosensors. SENSORS 2021; 21:s21103502. [PMID: 34069780 PMCID: PMC8157299 DOI: 10.3390/s21103502] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 01/13/2021] [Accepted: 01/28/2021] [Indexed: 12/20/2022]
Abstract
The objective of the current study is to analyze numerically the effect of the temperature-jump boundary condition on heterogeneous microfluidic immunosensors under electrothermal force. A three-dimensional simulation using the finite element method on the binding reaction kinetics of C-reactive protein (CRP) was performed. The kinetic reaction rate was calculated with coupled Laplace, Navier−Stokes, energy, and mass diffusion equations. Two types of reaction surfaces were studied: one in the form of a disc surrounded by two electrodes and the other in the form of a circular ring, one electrode is located inside the ring and the other outside. The numerical results reveal that the performance of a microfluidic biosensor is enhanced by using the second design of the sensing area (circular ring) coupled with the electrothermal force. The improvement factor under the applied ac field 15 Vrms was about 1.2 for the first geometry and 3.6 for the second geometry. Furthermore, the effect of temperature jump on heat transfer rise and response time was studied. The effect of two crucial parameters, viz. Knudsen number (Kn) and thermal accommodation coefficient (σT) with and without electrothermal effect, were analyzed for the two configurations.
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9
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Enhancement of Heterogeneous Microfluidic Immunosensors Using New Sensing Area Shape with Electrothermal Effect. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11104566] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
In heterogeneous microfluidic immunosensors, the diffusion boundary layer produced on the sensing area represents a critical factor that limits the biosensor performance. A three-dimensional simulation using the finite element method on the binding reaction kinetics of C-reactive protein (CRP) has been performed. We present a new microfluidic biosensor based on a novel reaction-surface design without and with electrothermal force. Two reaction surface configurations were studied. The kinetic reaction rate was calculated with coupled Navier−Stokes, mass diffusion, energy, and Laplace equations. The numerical results reveal that the characteristics of a microfluidic biosensor are more enhanced by using the circular ring design of the sensing area coupled with the electrothermal force. The rate of initial slope related to the association phase is multiplied by a factor 2 when the voltage is increased from 10 to 15 V. The results prove to be valuable in designing new microfluidic biosensors.
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Kaziz S, Saad Y, Bouzid M, Selmi M, Belmabrouk H. Enhancement of COVID-19 detection time by means of electrothermal force. MICROFLUIDICS AND NANOFLUIDICS 2021; 25:86. [PMID: 34548854 PMCID: PMC8446728 DOI: 10.1007/s10404-021-02490-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Accepted: 09/05/2021] [Indexed: 05/04/2023]
Abstract
The rapid spread and quick transmission of the new ongoing pandemic coronavirus disease 2019 (COVID-19) has urged the scientific community to looking for strong technology to understand its pathogenicity, transmission, and infectivity, which helps in the development of effective vaccines and therapies. Furthermore, there was a great effort to improve the performance of biosensors so that they can detect the pathogenic virus quickly, in reliable and precise way. In this context, we propose a numerical simulation to highlight the important role of the design parameters that can significantly improve the performance of the biosensor, in particular the sensitivity as well as the detection limit. Applied alternating current electrothermal (ACET) force can generate swirling patterns in the fluid within the microfluidic channel, which improve the transport of target molecule toward the reaction surface and, thus, enhance the response time of the biosensor. In this work, the ACET effect on the SARS-CoV-2 S protein binding reaction kinetics and on the detection time of the biosensor was analyzed. Appropriate choice of electrodes location on the walls of the microchannel and suitable values of the dissociation and association rates of the binding reaction, while maintaining the same affinity, with and without ACET effect, are also, discussed to enhance the total performance of the biosensor and reduce its response time. The two-dimensional equations system is solved by the finite element approach. The best performance of the biosensor is obtained in the case where the response time decreased by 61% with AC applying voltage.
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Affiliation(s)
- Sameh Kaziz
- Quantum and Statistical Physics Laboratory, Faculty of Sciences of Monastir, University of Monastir, Environment Boulevard, 5019 Monastir, Tunisia
- Higher National Engineering School of Tunis, Taha Hussein Montfleury Boulevard, University of Tunis, 1008 Tunis, Tunisia
| | - Yosra Saad
- Quantum and Statistical Physics Laboratory, Faculty of Sciences of Monastir, University of Monastir, Environment Boulevard, 5019 Monastir, Tunisia
| | - Mohamed Bouzid
- Quantum and Statistical Physics Laboratory, Faculty of Sciences of Monastir, University of Monastir, Environment Boulevard, 5019 Monastir, Tunisia
| | - Marwa Selmi
- Department of Radiological Sciences and Medical Imaging, College of Applied Medical Sciences, Majmaah University, AlMajmaah, 11952 Saudi Arabia
- Laboratory of Electronics and Microelectronics, Faculty of Science of Monastir, University of Monastir, Environment Boulevard, 5019 Monastir, Tunisia
| | - Hafedh Belmabrouk
- Laboratory of Electronics and Microelectronics, Faculty of Science of Monastir, University of Monastir, Environment Boulevard, 5019 Monastir, Tunisia
- Department of Physics, College of Science at Al Zulfi, Majmaah University, AlMajmaah, Saudi Arabia
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Koklu A, Giuliani J, Monton C, Beskok A. Rapid and Sensitive Detection of Nanomolecules by an AC Electrothermal Flow Facilitated Impedance Immunosensor. Anal Chem 2020; 92:7762-7769. [DOI: 10.1021/acs.analchem.0c00890] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Anil Koklu
- Biological and Environmental Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Jason Giuliani
- Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, Texas 78249, United States
| | - Carlos Monton
- General Atomics, P.O. Box 85608, San Diego, California 92186 United States
| | - Ali Beskok
- Department of Mechanical Engineering, Southern Methodist University, Dallas, Texas 75205, United States
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Selmi M, Belmabrouk H. AC Electroosmosis Effect on Microfluidic Heterogeneous Immunoassay Efficiency. MICROMACHINES 2020; 11:mi11040342. [PMID: 32218325 PMCID: PMC7230709 DOI: 10.3390/mi11040342] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 03/13/2020] [Accepted: 03/23/2020] [Indexed: 12/12/2022]
Abstract
A heterogeneous immunoassay is an efficient biomedical test. It aims to detect the presence of an analyte or to measure its concentration. It has many applications, such as manipulating particles and separating cancer cells from blood. The enhanced performance of immunosensors comes down to capturing more antigens with greater efficiency by antibodies in a short time. In this work, we report an efficient investigation of the effects of alternating current (AC) electrokinetic forces such as AC electroosmosis (ACEO), which arise when the fluid absorbs energy from an applied electric field, on the kinetics of the antigen-antibody binding in a flow system. The force can produce swirling structures in the fluid and, thus, improve the transport of the analyte toward the reaction surface of the immunosensor device. A numerical simulation is adequate for this purpose and may provide valuable information. The convection-diffusion phenomenon is coupled with the first-order Langmuir model. The governing equations are solved using the finite element method (FEM). The impact of AC electroosmosis on the binding reaction kinetics, the fluid flow stream modification, the analyte concentration diffusion, and the detection time of the biosensor under AC electroosmosis are analyzed.
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Affiliation(s)
- Marwa Selmi
- Department of Radiological Sciences and Medical Imaging, College of Applied Medical Sciences, Majmaah University, Majmaah 11952, Saudi Arabia
- Laboratory of Electronics and Microelectronics, Faculty of Science of Monastir, University of Monastir, Environment Boulevard, Monastir 5019, Tunisia;
- Correspondence: ; Tel.: +966-563447961
| | - Hafedh Belmabrouk
- Laboratory of Electronics and Microelectronics, Faculty of Science of Monastir, University of Monastir, Environment Boulevard, Monastir 5019, Tunisia;
- Department of Physics, College of Sciences at Zulfi, Majmaah University, Majmaah 11952, Saudi Arabia
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Liu W, Ren Y, Tao Y, Yan H, Xiao C, Wu Q. Buoyancy-Free Janus Microcylinders as Mobile Microelectrode Arrays for Continuous Microfluidic Biomolecule Collection within a Wide Frequency Range: A Numerical Simulation Study. MICROMACHINES 2020; 11:mi11030289. [PMID: 32164333 PMCID: PMC7142959 DOI: 10.3390/mi11030289] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 02/24/2020] [Accepted: 03/09/2020] [Indexed: 11/16/2022]
Abstract
We numerically study herein the AC electrokinetic motion of Janus mobile microelectrode (ME) arrays in electrolyte solution in a wide field frequency, which holds great potential for biomedical applications. A fully coupled physical model, which incorporates the fluid-structure interaction under the synergy of induced-charge electroosmotic (ICEO) slipping and interfacial Maxwell stress, is developed for this purpose. A freely suspended Janus cylinder free from buoyancy, whose main body is made of polystyrene, while half of the particle surface is coated with a thin conducting film of negligible thickness, will react actively on application of an AC signal. In the low-frequency limit, induced-charge electrophoretic (ICEP) translation occurs due to symmetric breaking in ICEO slipping, which renders the insulating end to move ahead. At higher field frequencies, a brand-new electrokinetic transport phenomenon called "ego-dielectrophoresis (e-DEP)" arises due to the action of the localized uneven field on the inhomogeneous particle dipole moment. In stark contrast with the low-frequency ICEP translation, the high-frequency e-DEP force tends to drive the asymmetric dipole moment to move in the direction of the conducting end. The bidirectional transport feature of Janus microspheres in a wide AC frequency range can be vividly interpreted as an array of ME for continuous loading of secondary bioparticles from the surrounding liquid medium along its direction-controllable path by long-range electroconvection. These results pave the way for achieving flexible and high-throughput on-chip extraction of nanoscale biological contents for subsequent on-site bioassay based upon AC electrokinetics of Janus ME arrays.
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Affiliation(s)
- Weiyu Liu
- School of Electronics and Control Engineering, Chang’an University, Middle-Section of Nan’er Huan Road, Xi’an 710064, China; (W.L.); (C.X.); (Q.W.)
| | - Yukun Ren
- State Key Laboratory of Robotics and System, Harbin Institute of Technology, West Da-zhi Street 92, Harbin 150001, China;
- Correspondence: (R.Y.); (H.Y.); Tel.: +86-0451-8641-8028 (Y.R.)
| | - Ye Tao
- State Key Laboratory of Robotics and System, Harbin Institute of Technology, West Da-zhi Street 92, Harbin 150001, China;
| | - Hui Yan
- School of Mechatronics Engineering, Harbin Institute of Technology, West Da-zhi Street 92, Harbin 150001, China
- Correspondence: (R.Y.); (H.Y.); Tel.: +86-0451-8641-8028 (Y.R.)
| | - Congda Xiao
- School of Electronics and Control Engineering, Chang’an University, Middle-Section of Nan’er Huan Road, Xi’an 710064, China; (W.L.); (C.X.); (Q.W.)
| | - Qisheng Wu
- School of Electronics and Control Engineering, Chang’an University, Middle-Section of Nan’er Huan Road, Xi’an 710064, China; (W.L.); (C.X.); (Q.W.)
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14
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Lijnse T, Cenaiko S, Dalton C. Numerical simulation of a tuneable reversible flow design for practical ACET devices. SN APPLIED SCIENCES 2020. [DOI: 10.1007/s42452-020-2098-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
AbstractAlternating Current Electrothermal (ACET) micropumps are a well-documented flow induction and mixing method. This phenomenon has significant promise as a reliable microfluidic pumping method for high conductivity biofluids, such as cerebrospinal fluid, urine, or blood. Practical implementations so far have been limited by complex designs focused on maximized flow rates, typically in only one direction at a time. This paper describes a device geometry demonstrating, and quantifying for the first time, fully reversible flow, that is, going from 100% flow in one direction to fully symmetrical 100% flow in the opposite direction. This design incorporates multiple features targeted at practical fabrication and applications. The design enables fine-tuning of flow speeds via adjustable signal strengths in a unique manner compared to traditional ACET devices. A full numerical simulation of this device has been performed within this work. Additionally, this paper reports several methods for increasing usability of ACET devices, including proposing coatings to prevent electrolysis and increase flow rates without the risk of fluid reactions, manufacturing methods for ease of handling, and specific device parameters for implementation in microdevices. The development of an ACET device that can precisely and efficiently pump and extract fluids allows for new applications in integrated biological systems and monitoring devices.
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15
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Salari A, Navi M, Lijnse T, Dalton C. AC Electrothermal Effect in Microfluidics: A Review. MICROMACHINES 2019; 10:E762. [PMID: 31717932 PMCID: PMC6915365 DOI: 10.3390/mi10110762] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 10/27/2019] [Accepted: 10/28/2019] [Indexed: 02/06/2023]
Abstract
The electrothermal effect has been investigated extensively in microfluidics since the 1990s and has been suggested as a promising technique for fluid manipulations in lab-on-a-chip devices. The purpose of this article is to provide a timely overview of the previous works conducted in the AC electrothermal field to provide a comprehensive reference for researchers new to this field. First, electrokinetic phenomena are briefly introduced to show where the electrothermal effect stands, comparatively, versus other mechanisms. Then, recent advances in the electrothermal field are reviewed from different aspects and categorized to provide a better insight into the current state of the literature. Results and achievements of different studies are compared, and recommendations are made to help researchers weigh their options and decide on proper configuration and parameters.
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Affiliation(s)
- Alinaghi Salari
- Biomedical Engineering Graduate Program, Ryerson University, Toronto, ON M5B 2K3, Canada;
- Institute for Biomedical Engineering, Science and Technology (iBEST), St. Michael’s Hospital, Toronto, ON M5B 1T8, Canada
- Keenan Research Centre, St. Michael’s Hospital, Toronto, ON M5B 1T8, Canada
| | - Maryam Navi
- Biomedical Engineering Graduate Program, Ryerson University, Toronto, ON M5B 2K3, Canada;
- Institute for Biomedical Engineering, Science and Technology (iBEST), St. Michael’s Hospital, Toronto, ON M5B 1T8, Canada
- Keenan Research Centre, St. Michael’s Hospital, Toronto, ON M5B 1T8, Canada
| | - Thomas Lijnse
- Biomedical Engineering Graduate Program, University of Calgary, Calgary, AB T2N 1N4, Canada;
| | - Colin Dalton
- Biomedical Engineering Graduate Program, University of Calgary, Calgary, AB T2N 1N4, Canada;
- Electrical and Computer Engineering Department, University of Calgary, Calgary, AB T2N 1N4, Canada
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16
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Koklu A, El Helou A, Raad PE, Beskok A. Characterization of Temperature Rise in Alternating Current Electrothermal Flow Using Thermoreflectance Method. Anal Chem 2019; 91:12492-12500. [DOI: 10.1021/acs.analchem.9b03238] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Anil Koklu
- Department of Mechanical Engineering, Southern Methodist University, Dallas, Texas 75205, United States
| | - Assaad El Helou
- Department of Mechanical Engineering, Southern Methodist University, Dallas, Texas 75205, United States
| | - Peter E. Raad
- Department of Mechanical Engineering, Southern Methodist University, Dallas, Texas 75205, United States
| | - Ali Beskok
- Department of Mechanical Engineering, Southern Methodist University, Dallas, Texas 75205, United States
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17
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Lin H, Zhao Y, Lin S, Wang B, Yeung C, Cheng X, Wang Z, Cai T, Yu W, King K, Tan J, Salahi K, Hojaiji H, Emaminejad S. A rapid and low-cost fabrication and integration scheme to render 3D microfluidic architectures for wearable biofluid sampling, manipulation, and sensing. LAB ON A CHIP 2019; 19:2844-2853. [PMID: 31359008 DOI: 10.1039/c9lc00418a] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
The large-scale deployment of wearable bioanalytical devices for general population longitudinal monitoring necessitates rapid and high throughput manufacturing-amenable fabrication schemes that render disposable, low-cost, and mechanically flexible microfluidic modules capable of performing a variety of bioanalytical operations within a compact footprint. The spatial constraints of previously reported wearable bioanalytical devices (with microfluidic operations confined to 2D), their lack of biofluid manipulation capability, and the complex and low-throughput nature of their fabrication process inherently limit the diversity and frequency of end-point assessments and prevent their deployment at large scale. Here, we devise a simple, scalable, and low-cost "CAD-to-3D Device" fabrication and integration scheme, which renders 3D and complex microfluidic architectures capable of performing biofluid sampling, manipulation, and sensing. The devised scheme is based on laser-cutting of tape-based substrates, which can be programmed at the software-level to rapidly define microfluidic features such as a biofluid collection interface, microchannels, and VIAs (vertical interconnect access), followed by the vertical assembly of pre-patterned layers to realize the final device. To inform the utility of our fabrication scheme, we demonstrated three representative devices to perform sweat collection (with visualizable secretion profile), sample filtration, and simultaneous biofluid actuation and sensing (using a sandwiched-interface). Our devised scheme can be adapted for the fabrication and manufacturing of current and future wearable bioanalytical devices, which in turn will catalyze the large-scale production and deployment of such devices for general population health monitoring.
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Affiliation(s)
- Haisong Lin
- Interconnected & Integrated Bioelectronics Lab (I2BL), Department of Electrical and Computer Engineering, University of California, Los Angeles, CA, USA.
| | - Yichao Zhao
- Interconnected & Integrated Bioelectronics Lab (I2BL), Department of Electrical and Computer Engineering, University of California, Los Angeles, CA, USA. and Department of Materials Science and Engineering, University of California, Los Angeles, CA, USA
| | - Shuyu Lin
- Interconnected & Integrated Bioelectronics Lab (I2BL), Department of Electrical and Computer Engineering, University of California, Los Angeles, CA, USA.
| | - Bo Wang
- Interconnected & Integrated Bioelectronics Lab (I2BL), Department of Electrical and Computer Engineering, University of California, Los Angeles, CA, USA.
| | - Christopher Yeung
- Interconnected & Integrated Bioelectronics Lab (I2BL), Department of Electrical and Computer Engineering, University of California, Los Angeles, CA, USA. and Department of Materials Science and Engineering, University of California, Los Angeles, CA, USA
| | - Xuanbing Cheng
- Interconnected & Integrated Bioelectronics Lab (I2BL), Department of Electrical and Computer Engineering, University of California, Los Angeles, CA, USA. and Department of Materials Science and Engineering, University of California, Los Angeles, CA, USA
| | - Zhaoqing Wang
- Interconnected & Integrated Bioelectronics Lab (I2BL), Department of Electrical and Computer Engineering, University of California, Los Angeles, CA, USA.
| | - Tianyou Cai
- Interconnected & Integrated Bioelectronics Lab (I2BL), Department of Electrical and Computer Engineering, University of California, Los Angeles, CA, USA.
| | - Wenzhuo Yu
- Interconnected & Integrated Bioelectronics Lab (I2BL), Department of Electrical and Computer Engineering, University of California, Los Angeles, CA, USA.
| | - Kimber King
- Interconnected & Integrated Bioelectronics Lab (I2BL), Department of Electrical and Computer Engineering, University of California, Los Angeles, CA, USA.
| | - Jiawei Tan
- Interconnected & Integrated Bioelectronics Lab (I2BL), Department of Electrical and Computer Engineering, University of California, Los Angeles, CA, USA. and Department of Materials Science and Engineering, University of California, Los Angeles, CA, USA
| | - Kamyar Salahi
- Interconnected & Integrated Bioelectronics Lab (I2BL), Department of Electrical and Computer Engineering, University of California, Los Angeles, CA, USA.
| | - Hannaneh Hojaiji
- Interconnected & Integrated Bioelectronics Lab (I2BL), Department of Electrical and Computer Engineering, University of California, Los Angeles, CA, USA.
| | - Sam Emaminejad
- Interconnected & Integrated Bioelectronics Lab (I2BL), Department of Electrical and Computer Engineering, University of California, Los Angeles, CA, USA. and Department of Bioengineering, University of California, Los Angeles, CA, USA
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18
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Kunti G, Dhar J, Bhattacharya A, Chakraborty S. Joule heating-induced particle manipulation on a microfluidic chip. BIOMICROFLUIDICS 2019; 13:014113. [PMID: 30867883 PMCID: PMC6404938 DOI: 10.1063/1.5082978] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Accepted: 02/13/2019] [Indexed: 05/07/2023]
Abstract
We develop an electrokinetic technique that continuously manipulates colloidal particles to concentrate into patterned particulate groups in an energy efficient way, by exclusive harnessing of the intrinsic Joule heating effects. Our technique exploits the alternating current electrothermal flow phenomenon which is generated due to the interaction between non-uniform electric and thermal fields. Highly non-uniform electric field generates sharp temperature gradients by generating spatially-varying Joule heat that varies along the radial direction from a concentrated point hotspot. Sharp temperature gradients induce a local variation in electric properties which, in turn, generate a strong electrothermal vortex. The imposed fluid flow brings the colloidal particles at the centre of the hotspot and enables particle aggregation. Furthermore, maneuvering structures of the Joule heating spots, different patterns of particle clustering may be formed in a low power budget, thus opening up a new realm of on-chip particle manipulation process without necessitating a highly focused laser beam which is much complicated and demands higher power budget. This technique can find its use in Lab-on-a-chip devices to manipulate particle groups, including biological cells.
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Affiliation(s)
- Golak Kunti
- Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India
| | - Jayabrata Dhar
- CNRS, Universite de Rennes 1, Geosciences Rennes UMR6118, Rennes, France
| | - Anandaroop Bhattacharya
- 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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19
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Rapid and selective concentration of bacteria, viruses, and proteins using alternating current signal superimposition on two coplanar electrodes. Sci Rep 2018; 8:14942. [PMID: 30297764 PMCID: PMC6175930 DOI: 10.1038/s41598-018-33329-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Accepted: 09/14/2018] [Indexed: 12/01/2022] Open
Abstract
Dielectrophoresis (DEP) is usually effective close to the electrode surface. Several techniques have been developed to overcome its drawbacks and to enhance dielectrophoretic particle capture. Here we present a simple technique of superimposing alternating current DEP (high-frequency signals) and electroosmosis (EO; low-frequency signals) between two coplanar electrodes (gap: 25 μm) using a lab-made voltage adder for rapid and selective concentration of bacteria, viruses, and proteins, where we controlled the voltages and frequencies of DEP and EO separately. This signal superimposition technique enhanced bacterial capture (Escherichia coli K-12 against 1-μm-diameter polystyrene beads) more selectively (>99%) and rapidly (~30 s) at lower DEP (5 Vpp) and EO (1.2 Vpp) potentials than those used in the conventional DEP capture studies. Nanometer-sized MS2 viruses and troponin I antibody proteins were also concentrated using the superimposed signals, and significantly more MS2 and cTnI-Ab were captured using the superimposed signals than the DEP (10 Vpp) or EO (2 Vpp) signals alone (p < 0.035) between the two coplanar electrodes and at a short exposure time (1 min). This technique has several advantages, such as simplicity and low cost of electrode fabrication, rapid and large collection without electrolysis.
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20
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Gao X, Li Y. Biofluid pumping and mixing by an AC electrothermal micropump embedded with a spiral microelectrode pair in a cylindrical microchannel. Electrophoresis 2018; 39:3156-3170. [PMID: 30194859 DOI: 10.1002/elps.201800162] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 08/20/2018] [Accepted: 08/31/2018] [Indexed: 11/10/2022]
Abstract
In this paper, we numerically investigated a multifunctional AC electrothermal (ACET) micropump embedded with an asymmetric spiral microelectrode pair in a cylindrical microchannel for simultaneous pumping and mixing in high-conductivity fluids, which makes the pump useful for biofluid applications. When an AC signal was applied to the asymmetric spiral electrode pair, the vortices induced on the electrode surfaces with centerlines along the corresponding spiral electrode length exhibit a spiral distribution, and the net flow in the cylindrical microchannel is generated by the ACET effect. The vorticity field distribution can explain the mechanism of simultaneous pumping and mixing. Because the vorticity field is inclined against the microchannel direction, vortices on top of the spiral electrodes can affect the ACET flow in the following two aspects at the same time: one is pumping the flow in the microchannel direction, and the other is mixing the samples by stirring the flow. We also determined that the geometric ratios of the electrode width to the gap or slant angle of the spiral electrodes can feasibly be used to control the relative strength of the pumping and mixing capabilities, and we achieved an optimal design that gives both desirable pumping and mixing efficiencies. This study shows that the spiral ACET micropump design can rapidly drive the high-conductivity fluids and efficiently mix samples simultaneously. The numerical simulation of the spiral ACET micropump is of significant importance for practical, chemical and biological applications, and feasible fabrication techiniques should be experimentally investigated in future studies.
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Affiliation(s)
- Xiaobo Gao
- School of Physics and Engineering, Zhengzhou University, Zhengzhou, Henan, P. R. China
| | - Yuxiao Li
- School of Physics and Engineering, Zhengzhou University, Zhengzhou, Henan, P. R. China
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21
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Mi S, Li B, Yi X, Xu Y, Du Z, Yang S, Li W, Sun W. An AC electrothermal self-circulating system with a minimalist process to construct a biomimetic liver lobule model for drug testing. RSC Adv 2018; 8:36987-36998. [PMID: 35557806 PMCID: PMC9089443 DOI: 10.1039/c8ra03724h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Accepted: 09/27/2018] [Indexed: 01/09/2023] Open
Abstract
Liver-on-chip, due to its precision and low cost for constructing in vitro models, has tremendous potential for drug toxicity testing and pathological studies.
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Affiliation(s)
- Shengli Mi
- Graduate School at Shenzhen
- Tsinghua University
- Shenzhen
- P. R. China
- Open FIESTA Center
| | - Baihan Li
- Graduate School at Shenzhen
- Tsinghua University
- Shenzhen
- P. R. China
| | - Xiaoman Yi
- Graduate School at Shenzhen
- Tsinghua University
- Shenzhen
- P. R. China
| | - Yuanyuan Xu
- Tsinghua-Berkeley Shenzhen Institute
- Shenzhen
- P. R. China
| | - Zhichang Du
- Graduate School at Shenzhen
- Tsinghua University
- Shenzhen
- P. R. China
| | - Shuaitao Yang
- Graduate School at Shenzhen
- Tsinghua University
- Shenzhen
- P. R. China
| | - Wei Li
- Department of Mechanical Engineering
- The University of Texas at Austin
- Austin
- USA
| | - Wei Sun
- Graduate School at Shenzhen
- Tsinghua University
- Shenzhen
- P. R. China
- Department of Mechanical Engineering and Mechanics
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22
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Hosseini A, Philpott DN, Soleymani L. Enrichment of magnetic particles using temperature and magnetic field gradients induced by benchtop fabricated micro-electromagnets. LAB ON A CHIP 2017; 17:4097-4104. [PMID: 29076512 DOI: 10.1039/c7lc00825b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The active transport of analytes inside biosensing systems is important for reducing the response time and enhancing the limit-of-detection of these systems. Due to the ease of functionalization with bio-recognition agents and manipulation with magnetic fields, magnetic particles are widely used for active and directed transport of biological analytes. On-chip active electromagnets are ideally suited for manipulating magnetic particles in an automated and miniaturized fashion inside biosensing systems. Unfortunately, the magnetic force exerted by these devices decays rapidly as we move away from the device edges, and increasing the generated force to the levels necessary for particle manipulation requires a parallel increase in the applied current and the resultant Joule heating. In this paper, we designed a study to understand the combined role of thermal and magnetic forces on the movement of magnetic particles in order to extend the interaction distance of on-chip magnetic devices beyond the device edges. For this purpose, we used a rapid prototyping method to create an active/passive on-chip electromagnet with a micro/nano-structured active layer and a patterned ferromagnetic passive layer. We demonstrated that the measured terminal velocities of particles positioned near the electromagnet edge (∼5.5 μm) closely reflect the values obtained by multi-physics modelling. Interestingly, we observed a two orders of magnitude deviation between the experimental and modelling results for the terminal velocities of particles far from the electromagnet edge (∼55.5 μm). Heat modelling of the system using experimentally-measured thermal gradients indicates that this discrepancy is related to the enhanced fluid movement caused by thermal forces. This study enables the rational design of thermo-magnetic systems for thermally driving and magnetically capturing particles that are positioned at distances tens to hundreds of microns away from the edges of on-chip magnetic devices.
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Affiliation(s)
- A Hosseini
- School of Biomedical Engineering, McMaster University, Hamilton, ON L8S 4L8, Canada.
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23
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Liu W, Ren Y, Tao Y, Yao B, Li Y. Simulation analysis of rectifying microfluidic mixing with field-effect-tunable electrothermal induced flow. Electrophoresis 2017; 39:779-793. [DOI: 10.1002/elps.201700234] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 08/20/2017] [Accepted: 08/28/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Weiyu Liu
- School of Electronics and Control Engineering; Chang'an University; Xi'an P. R. China
| | - Yukun Ren
- School of Mechatronics Engineering; Harbin Institute of Technology; Harbin P. R. China
- State Key Laboratory of Robotics and System; Harbin Institute of Technology; Harbin P. R. China
| | - Ye Tao
- School of Mechatronics Engineering; Harbin Institute of Technology; Harbin P. R. China
| | - Bobin Yao
- School of Electronics and Control Engineering; Chang'an University; Xi'an P. R. China
| | - You Li
- School of Electronics and Control Engineering; Chang'an University; Xi'an P. R. China
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24
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Hu Q, Ren Y, Liu W, Tao Y, Jiang H. Simulation Analysis of Improving Microfluidic Heterogeneous Immunoassay Using Induced Charge Electroosmosis on a Floating Gate. MICROMACHINES 2017; 8:E212. [PMID: 30400403 PMCID: PMC6190211 DOI: 10.3390/mi8070212] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 07/02/2017] [Accepted: 07/03/2017] [Indexed: 11/16/2022]
Abstract
On-chip immuno-sensors are a hot topic in the microfluidic community, which is usually limited by slow diffusion-dominated transport of analytes in confined microchannels. Specifically, the antigen-antibody binding reaction at a functionalized area cannot be provided with enough antigen source near the reaction surface, since a small diffusion flux cannot match with the quick rate of surface reaction, which influences the response time and sensitivity of on-chip heterogeneous immunoassay. In this work, we propose a method to enhance the transportation of biomolecules to the surface of an antibody-immobilized electrode with induce charge electroosmotic (ICEO) convection in a low concentration suspension, so as to improve the binding efficiency of microfluidic heterogeneous immunoassays. The circular stirring fluid motion of ICEO on the surface of a floating gate electrode at the channel bottom accelerates the transport of freely suspended antigen towards the wall-immobilized antibodies. We investigate the dependence of binding efficiency on voltage magnitude and field frequency of the applied alternate current (AC) electrical field. The binding rate yields a factor of 5.4 higher binding for an applied voltage of 4 V at 10 Hz when the Damkohler number is 1000. The proposed microfluidic immuno-sensor technology of a simple electrode structure using ICEO convective fluid flow around floating conductors could offer exciting opportunities for diffusion-limited on-chip bio-microfluidic sensors.
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Affiliation(s)
- Qingming Hu
- School of Mechatronics Engineering, Harbin Institute of Technology, West Da-zhi Street 92, Harbin 150001, Heilongjiang, China.
- School of Mechatronics Engineering, Qiqihar University, Wenhua Street 42, Qiqihar 161006, Heilongjiang, China.
| | - Yukun Ren
- School of Mechatronics Engineering, Harbin Institute of Technology, West Da-zhi Street 92, Harbin 150001, Heilongjiang, China.
- State Key Laboratory of Robotics and System, Harbin Institute of Technology, West Da-zhi Street 92, Harbin 150001, Heilongjiang, China.
| | - Weiyu Liu
- School of Mechatronics Engineering, Harbin Institute of Technology, West Da-zhi Street 92, Harbin 150001, Heilongjiang, China.
- School of Electronics and Control Engineering, Chang'an University, Middle-section of Nan'erHuan Road, Xi'an 710064, Shaanxi, China.
| | - Ye Tao
- School of Mechatronics Engineering, Harbin Institute of Technology, West Da-zhi Street 92, Harbin 150001, Heilongjiang, China.
| | - Hongyuan Jiang
- School of Mechatronics Engineering, Harbin Institute of Technology, West Da-zhi Street 92, Harbin 150001, Heilongjiang, China.
- State Key Laboratory of Robotics and System, Harbin Institute of Technology, West Da-zhi Street 92, Harbin 150001, Heilongjiang, China.
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25
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Cheng C, Oueslati R, Wu J, Chen J, Eda S. Capacitive DNA sensor for rapid and sensitive detection of whole genome human herpesvirus-1 dsDNA in serum. Electrophoresis 2017; 38:1617-1623. [DOI: 10.1002/elps.201700043] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Revised: 03/08/2017] [Accepted: 03/16/2017] [Indexed: 12/27/2022]
Affiliation(s)
- Cheng Cheng
- Department of Electrical Engineering and Computer Science; The University of Tennessee; Knoxville TN USA
| | - Rania Oueslati
- Department of Electrical Engineering and Computer Science; The University of Tennessee; Knoxville TN USA
| | - Jayne Wu
- Department of Electrical Engineering and Computer Science; The University of Tennessee; Knoxville TN USA
| | - Jiangang Chen
- Department of Public Health; The University of Tennessee; Knoxville TN USA
| | - Shigetoshi Eda
- Department of Forestry, Wildlife and Fisheries; The University of Tennessee Institute of Agriculture; Knoxville TN USA
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26
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Selmi M, Gazzah MH, Belmabrouk H. Numerical Study of the Electrothermal Effect on the Kinetic Reaction of Immunoassays for a Microfluidic Biosensor. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:13305-13312. [PMID: 27993020 DOI: 10.1021/acs.langmuir.6b02637] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In this work, we simulate the binding reaction of C-reactive protein in a microchannel of a biosensor. A problem that arises in this device concerns the transport of the analyte toward the reaction surface of the biosensor, which is of a very small dimension. The limitation of mass transport causes the formation of a diffusion boundary layer and restrains the whole kinetic reaction. To enhance the performance of the biosensor by improving the transport, an applied AC electric field and flow confinement are used to stir the flow field. The numerical simulation of these mechanisms on the binding reaction is performed using the finite element method. Swirling patterns are generated in the fluid. They enhance the transport of the analyte and confine it near the reaction surface. The location of the electrode pair on the walls of the microchannel for the design of the biosensor has been studied to find out the effects of varying geometric configurations on the binding efficiency. The best performances of the biosensor are obtained when the electrodes are placed on the same wall of the microchannel as the reaction surface. For the best case, under the effect of the applied electric field alone, the enhancement factors raise up to 2.46 and 2.10 for the association and dissociation phases, respectively. By contrast, under the effect of the electric field with flow confinement, the enhancement factors for the association and the dissociation phases jump to 3.43 and 2.97, respectively, for 30:1 flow confinement (ratio of confining to sample flow).
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Affiliation(s)
- Marwa Selmi
- Laboratory of Electronics and Microelectronics, Faculty of Science of Monastir, University of Monastir , Environment Boulevard, Monastir 5019, Tunisia
- Department of Radiological Sciences and Medical Imaging, College of Applied Medical Sciences, Majmaah University , Al Majma'ah 11952, Saudi Arabia
| | - Mohamed Hichem Gazzah
- Laboratory of Electronics and Microelectronics, Faculty of Science of Monastir, University of Monastir , Environment Boulevard, Monastir 5019, Tunisia
| | - Hafedh Belmabrouk
- Laboratory of Electronics and Microelectronics, Faculty of Science of Monastir, University of Monastir , Environment Boulevard, Monastir 5019, Tunisia
- Department of Physics, College of Science AlZulfi, Majmaah University , Al Zulfi 11932, Saudi Arabia
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27
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Lu Y, Ren Q, Liu T, Leung SL, Gau V, Liao JC, Chan CL, Wong PK. Long-range electrothermal fluid motion in microfluidic systems. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 2016; 98:341-349. [PMID: 27127306 PMCID: PMC4843167 DOI: 10.1016/j.ijheatmasstransfer.2016.03.034] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
AC electrothermal flow (ACEF) is the fluid motion created as a result of Joule heating induced temperature gradients. ACEF is capable of performing major microfluidic operations, such as pumping, mixing, concentration, separation and assay enhancement, and is effective in biological samples with a wide range of electrical conductivity. Here, we report long-range fluid motion induced by ACEF, which creates centimeter-scale vortices. The long-range fluid motion displays a strong voltage dependence and is suppressed in microchannels with a characteristic length below ~300 μm. An extended computational model of ACEF, which considers the effects of the density gradient and temperature-dependent parameters, is developed and compared experimentally by particle image velocimetry. The model captures the essence of ACEF in a wide range of channel dimensions and operating conditions. The combined experimental and computational study reveals the essential roles of buoyancy, temperature rise, and associated changes in material properties in the formation of the long-range fluid motion. Our results provide critical information for the design and modeling of ACEF based microfluidic systems toward various bioanalytical applications.
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Affiliation(s)
- Yi Lu
- Department of Aerospace and Mechanical Engineering, The University of Arizona, Tucson, Arizona, 85721, USA
- Departments of Biomedical Engineering, The Pennsylvania State University, University Park, PA 16802 USA
| | - Qinlong Ren
- Department of Aerospace and Mechanical Engineering, The University of Arizona, Tucson, Arizona, 85721, USA
| | - Tingting Liu
- Department of Aerospace and Mechanical Engineering, The University of Arizona, Tucson, Arizona, 85721, USA
| | - Siu Ling Leung
- Departments of Biomedical Engineering, The Pennsylvania State University, University Park, PA 16802 USA
- College of Medicine, The University of Arizona, Tucson, 85724, USA
| | - Vincent Gau
- GeneFluidics Inc., Irwindale, California, 91010, USA
| | - Joseph C. Liao
- Department of Urology, Stanford University, Stanford, California, 94305, USA
| | - Cho Lik Chan
- Department of Aerospace and Mechanical Engineering, The University of Arizona, Tucson, Arizona, 85721, USA
| | - Pak Kin Wong
- Department of Aerospace and Mechanical Engineering, The University of Arizona, Tucson, Arizona, 85721, USA
- Departments of Biomedical Engineering, The Pennsylvania State University, University Park, PA 16802 USA
- Departments of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802 USA
- Department of Surgery, Milton S. Hershey Medical Center, The Pennsylvania State University, Hershey, PA 17033 USA
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28
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Asiaei S, Nieva PM. Studying the kinetics of thiols’ self-assembled monolayer formation in microfluidic channels. PARTICULATE SCIENCE AND TECHNOLOGY 2016. [DOI: 10.1080/02726351.2015.1089964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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29
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Han D, Park JK. Microarray-integrated optoelectrofluidic immunoassay system. BIOMICROFLUIDICS 2016; 10:034106. [PMID: 27190571 PMCID: PMC4866943 DOI: 10.1063/1.4950787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Accepted: 05/05/2016] [Indexed: 05/02/2023]
Abstract
A microarray-based analytical platform has been utilized as a powerful tool in biological assay fields. However, an analyte depletion problem due to the slow mass transport based on molecular diffusion causes low reaction efficiency, resulting in a limitation for practical applications. This paper presents a novel method to improve the efficiency of microarray-based immunoassay via an optically induced electrokinetic phenomenon by integrating an optoelectrofluidic device with a conventional glass slide-based microarray format. A sample droplet was loaded between the microarray slide and the optoelectrofluidic device on which a photoconductive layer was deposited. Under the application of an AC voltage, optically induced AC electroosmotic flows caused by a microarray-patterned light actively enhanced the mass transport of target molecules at the multiple assay spots of the microarray simultaneously, which reduced tedious reaction time from more than 30 min to 10 min. Based on this enhancing effect, a heterogeneous immunoassay with a tiny volume of sample (5 μl) was successfully performed in the microarray-integrated optoelectrofluidic system using immunoglobulin G (IgG) and anti-IgG, resulting in improved efficiency compared to the static environment. Furthermore, the application of multiplex assays was also demonstrated by multiple protein detection.
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Affiliation(s)
- Dongsik Han
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Je-Kyun Park
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
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Xing X, He M, Qiu H, Yobas L. Continuous-Flow Electrokinetic-Assisted Plasmapheresis by Using Three-Dimensional Microelectrodes Featuring Sidewall Undercuts. Anal Chem 2016; 88:5197-204. [DOI: 10.1021/acs.analchem.6b00215] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Xiaoxing Xing
- Department of Electronic and Computer
Engineering, ‡Department of Mechanical and Aerospace
Engineering, and §Division of Biomedical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
| | - Minghao He
- Department of Electronic and Computer
Engineering, ‡Department of Mechanical and Aerospace
Engineering, and §Division of Biomedical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
| | - Huihe Qiu
- Department of Electronic and Computer
Engineering, ‡Department of Mechanical and Aerospace
Engineering, and §Division of Biomedical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
| | - Levent Yobas
- Department of Electronic and Computer
Engineering, ‡Department of Mechanical and Aerospace
Engineering, and §Division of Biomedical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
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31
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Electrokinetic acceleration of DNA hybridization in microsystems. Talanta 2015; 138:149-154. [DOI: 10.1016/j.talanta.2015.02.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 02/10/2015] [Accepted: 02/14/2015] [Indexed: 11/22/2022]
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SONG NN, ZHANG H, LI JB, ZHEN JH, GAO J. Electrokinetic Separation of Polystyrene Microspheres in Conductive Media on a Microfluidic Chip. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2015. [DOI: 10.1016/s1872-2040(15)60801-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Salari A, Navi M, Dalton C. A novel alternating current multiple array electrothermal micropump for lab-on-a-chip applications. BIOMICROFLUIDICS 2015; 9:014113. [PMID: 25713695 PMCID: PMC4320149 DOI: 10.1063/1.4907673] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Accepted: 01/23/2015] [Indexed: 05/11/2023]
Abstract
The AC electrothermal technique is very promising for biofluid micropumping, due to its ability to pump high conductivity fluids. However, compared to electroosmotic micropumps, a lack of high fluid flow is a disadvantage. In this paper, a novel AC multiple array electrothermal (MAET) micropump, utilizing multiple microelectrode arrays placed on the side-walls of the fluidic channel of the micropump, is introduced. Asymmetric coplanar microelectrodes are placed on all sides of the microfluidic channel, and are actuated in different phases: one, two opposing, two adjacent, three, or all sides at the same time. Micropumps with different combinations of side electrodes and cross sections are numerically investigated in this paper. The effect of the governing parameters with respect to thermal, fluidic, and electrical properties are studied and discussed. To verify the simulations, the AC MAET concept was then fabricated and experimentally tested. The resulted fluid flow achieved by the experiments showed good agreement with the corresponding simulations. The number of side electrode arrays and the actuation patterns were also found to greatly influence the micropump performance. This study shows that the new multiple array electrothermal micropump design can be used in a wide range of applications such as drug delivery and lab-on-a-chip, where high flow rate and high precision micropumping devices for high conductivity fluids are needed.
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Affiliation(s)
- A Salari
- Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary , Calgary, Alberta T2N 1N4, Canada
| | - M Navi
- Semnan University , Semnan, Iran
| | - C Dalton
- Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary , Calgary, Alberta T2N 1N4, Canada
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Lu Y, Liu T, Lamanda AC, Sin MLY, Gau V, Liao JC, Wong PK. AC Electrokinetics of Physiological Fluids for Biomedical Applications. ACTA ACUST UNITED AC 2014; 20:611-20. [PMID: 25487557 DOI: 10.1177/2211068214560904] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Indexed: 12/13/2022]
Abstract
Alternating current (AC) electrokinetics is a collection of processes for manipulating bulk fluid mass and embedded objects with AC electric fields. The ability of AC electrokinetics to implement the major microfluidic operations, such as pumping, mixing, concentration, and separation, makes it possible to develop integrated systems for clinical diagnostics in nontraditional health care settings. The high conductivity of physiological fluids presents new challenges and opportunities for AC electrokinetics-based diagnostic systems. In this review, AC electrokinetic phenomena in conductive physiological fluids are described followed by a review of the basic microfluidic operations and the recent biomedical applications of AC electrokinetics. The future prospects of AC electrokinetics for clinical diagnostics are presented.
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Affiliation(s)
- Yi Lu
- Department of Aerospace and Mechanical Engineering, The University of Arizona, Tucson, AZ, USA
| | - Tingting Liu
- Department of Aerospace and Mechanical Engineering, The University of Arizona, Tucson, AZ, USA
| | - Ariana C Lamanda
- Biomedical Engineering, The University of Arizona, Tucson, AZ, USA
| | - Mandy L Y Sin
- Department of Urology, Stanford University, Stanford, CA, USA Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA
| | | | - Joseph C Liao
- Department of Urology, Stanford University, Stanford, CA, USA Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA
| | - Pak Kin Wong
- Department of Aerospace and Mechanical Engineering, The University of Arizona, Tucson, AZ, USA Biomedical Engineering, The University of Arizona, Tucson, AZ, USA
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Huang YH, Chang JS, Chao SD, Wu KC, Huang LS. Improving the binding efficiency of quartz crystal microbalance biosensors by applying the electrothermal effect. BIOMICROFLUIDICS 2014; 8:054116. [PMID: 25538808 PMCID: PMC4241767 DOI: 10.1063/1.4898633] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Accepted: 10/06/2014] [Indexed: 05/06/2023]
Abstract
A quartz crystal microbalance (QCM) serving as a biosensor to detect the target biomolecules (analytes) often suffers from the time consuming process, especially in the case of diffusion-limited reaction. In this experimental work, we modify the reaction chamber of a conventional QCM by integrating into the multi-microelectrodes to produce electrothermal vortex flow which can efficiently drive the analytes moving toward the sensor surface, where the analytes were captured by the immobilized ligands. The microelectrodes are placed on the top surface of the chamber opposite to the sensor, which is located on the bottom of the chamber. Besides, the height of reaction chamber is reduced to assure that the suspended analytes in the fluid can be effectively drived to the sensor surface by induced electrothermal vortex flow, and also the sample costs are saved. A series of frequency shift measurements associated with the adding mass due to the specific binding of the analytes in the fluid flow and the immobilized ligands on the QCM sensor surface are performed with or without applying electrothermal effect (ETE). The experimental results show that electrothermal vortex flow does effectively accelerate the specific binding and make the frequency shift measurement more sensible. In addition, the images of the binding surfaces of the sensors with or without applying electrothermal effect are taken through the scanning electron microscopy. By comparing the images, it also clearly indicates that ETE does raise the specific binding of the analytes and ligands and efficiently improves the performance of the QCM sensor.
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Affiliation(s)
- Yao-Hung Huang
- Institute of Applied Mechanics, National Taiwan University , Taipei, Taiwan
| | - Jeng-Shian Chang
- Institute of Applied Mechanics, National Taiwan University , Taipei, Taiwan
| | - Sheng D Chao
- Institute of Applied Mechanics, National Taiwan University , Taipei, Taiwan
| | - Kuang-Chong Wu
- Institute of Applied Mechanics, National Taiwan University , Taipei, Taiwan
| | - Long-Sun Huang
- Institute of Applied Mechanics, National Taiwan University , Taipei, Taiwan
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Protein binding reaction enhanced by bi-directional flow driven by on-chip thermopneumatic actuator. Biomed Microdevices 2014; 16:325-32. [DOI: 10.1007/s10544-014-9835-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Li S, Cui H, Yuan Q, Wu J, Wadhwa A, Eda S, Jiang H. AC electrokinetics-enhanced capacitive immunosensor for point-of-care serodiagnosis of infectious diseases. Biosens Bioelectron 2014; 51:437-43. [DOI: 10.1016/j.bios.2013.08.016] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Revised: 08/08/2013] [Accepted: 08/12/2013] [Indexed: 12/17/2022]
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38
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Li S, Ren Y, Jiang H. Convection and mass transfer enhanced rapid capacitive serum immunoassay. RSC Adv 2014. [DOI: 10.1039/c3ra46697c] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
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39
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Ouyang M, Mohan R, Lu Y, Liu T, Mach KE, Sin MLY, McComb M, Joshi J, Gau V, Wong PK, Liao JC. An AC electrokinetics facilitated biosensor cassette for rapid pathogen identification. Analyst 2013; 138:3660-6. [PMID: 23626988 DOI: 10.1039/c3an00259d] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
To develop a portable point-of-care system based on biosensors for common infectious diseases such as urinary tract infection, the sensing process needs to be implemented within an enclosed fluidic system. On chip sample preparation of clinical samples remains a significant obstacle to achieving robust sensor performance. Herein AC electrokinetics is applied in an electrochemical biosensor cassette to enhance molecular convection and hybridization efficiency through electrokinetics induced fluid motion and Joule heating induced temperature elevation. Using E. coli as an exemplary pathogen, we determined the optimal electrokinetic parameters for detecting bacterial 16S rRNA in the biosensor cassette based on the current output, signal-to-noise ratio, and limit of detection. In addition, a panel of six probe sets targeting common uropathogenic bacteria was demonstrated. The optimized parameters were also validated using patient-derived clinical urine samples. The effectiveness of electrokinetics for on chip sample preparation will facilitate the implementation of point-of-care diagnosis of urinary tract infection in the future.
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Affiliation(s)
- Mengxing Ouyang
- Department of Urology, Stanford University, Stanford, California 94305-5118, USA
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Li S, Yuan Q, Morshed BI, Ke C, Wu J, Jiang H. Dielectrophoretic responses of DNA and fluorophore in physiological solution by impedimetric characterization. Biosens Bioelectron 2013; 41:649-55. [PMID: 23084757 DOI: 10.1016/j.bios.2012.09.036] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2012] [Revised: 09/17/2012] [Accepted: 09/21/2012] [Indexed: 10/27/2022]
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41
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Lab-on-a-Chip, Micro- and Nanoscale Immunoassay Systems, and Microarrays. THE IMMUNOASSAY HANDBOOK 2013. [PMCID: PMC7152144 DOI: 10.1016/b978-0-08-097037-0.00013-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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42
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Sasaki N, Takemura A, Sato K. Alternating current cloud point extraction on a microchip: a comprehensive study. Electrophoresis 2012; 33:3159-65. [PMID: 23027025 DOI: 10.1002/elps.201200229] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Revised: 06/15/2012] [Accepted: 06/20/2012] [Indexed: 12/13/2022]
Abstract
We present a comprehensive study of alternating current cloud point extraction (ACPE) on a microchip. ACPE is an extraction technique for preconcentration of membrane-associated biomolecules. To characterize and optimize ACPE, we carried out ACPE experiments under various experimental conditions including amplitude and frequency of applied voltages, flow velocity, and concentration of surfactant, analyte, and salt. We found that ACPE has an amplitude threshold (15 V(p-p)), above which the extraction was more efficient. The dependence of the extraction on frequency (>5 MHz) was insignificant. Efficient extraction was achieved when the velocity of the test solution was 0.10∼0.67 mm s⁻¹ and the concentration of surfactant was 0.10∼1.0%. In contrast, the extraction was independent of the concentration of analytes (0.20∼20 μmol dm⁻³). The technique was applicable to solutions with a salt concentration of 0.050∼0.15 mol dm⁻³ under temperature control of the devices. Solution temperature in ACPE was also studied. These results provide guidelines for use of the ACPE technique in microfluidic chemical and biochemical analyses.
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Affiliation(s)
- Naoki Sasaki
- Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, Bunkyo, Tokyo, Japan.
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43
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Sasaki N, Kitamori T, Kim HB. Fluid mixing using AC electrothermal flow on meandering electrodes in a microchannel. Electrophoresis 2012; 33:2668-73. [DOI: 10.1002/elps.201200099] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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44
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Sin MLY, Liu T, Pyne JD, Gau V, Liao JC, Kin Wong P. In situ electrokinetic enhancement for self-assembled-monolayer-based electrochemical biosensing. Anal Chem 2012; 84:2702-7. [PMID: 22397486 PMCID: PMC4069200 DOI: 10.1021/ac203245j] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
This study reports a multifunctional electrode approach which directly implements electrokinetic enhancement on a self-assembled-monolayer-based electrochemical sensor for point-of-care diagnostics. Using urinary tract infections as a model system, we demonstrate that electrokinetic enhancement, which involves in situ stirring and heating, can enhance the sensitivity of the strain specific 16S rRNA hybridization assay for 1 order of magnitude and accelerate the time-limiting incubation step with a 6-fold reduction in the incubation time. Since the same electrode platform is used for both electrochemical signal enhancement and electrochemical sensing, the multifunctional electrode approach provides a highly effective strategy toward fully integrated lab-on-a-chip systems for various biomedical applications.
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Affiliation(s)
- Mandy L. Y. Sin
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721, United States
| | - Tingting Liu
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721, United States
| | - Jeffrey D. Pyne
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721, United States
| | - Vincent Gau
- GeneFluidics Inc, Irwindale, California 91010, United States
| | - Joseph C. Liao
- Department of Urology, Stanford University, Palo Alto, California 94304, United States
- Veterans Affairs Palo Alto Health Care System, Palo Alto, California 94304, United States
| | - Pak Kin Wong
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721, United States
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SASAKI N. Recent Applications of AC Electrokinetics in Biomolecular Analysis on Microfluidic Devices. ANAL SCI 2012; 28:3-8. [DOI: 10.2116/analsci.28.3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Naoki SASAKI
- Department of Chemical and Biological Sciences, Faculty of Science, Japan Women’s University
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Siva Kumar Gunda N, Bhattacharjee S, Mitra SK. Study on the use of dielectrophoresis and electrothermal forces to produce on-chip micromixers and microconcentrators. BIOMICROFLUIDICS 2012; 6:34118. [PMID: 24015164 PMCID: PMC3448596 DOI: 10.1063/1.4749827] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2012] [Accepted: 08/20/2012] [Indexed: 05/11/2023]
Abstract
The present study uses the dielectrophoresis (DEP) and electrothermal (ET) forces to develop on-chip micromixers and microconcentrators. A microchannel with rectangular array of microelectrodes, patterned either on its bottom surface only or on both the top and the bottom surfaces, is considered for the analysis. A mathematical model to compute electrical field, temperature field, the fluid velocity, and the concentration distributions is developed. Both analytical and numerical solutions of standing wave DEP (SWDEP), traveling wave DEP (TWDEP), standing wave ET (SWET), and traveling wave ET (TWET) forces along the length and the height of the channel are compared. The effects of electrode size and their placement in the microsystem on micromixing and microconcentrating performance are studied and compared to velocity and concentration profiles. SWDEP forces can be used to collect the particles at different locations in the microchannel. Under positive and negative DEP effect, the particles are collected at electrode edges and away from the electrodes, respectively, irrespective of the position, size, and number of electrodes. The location of the concentration region can be shifted by changing the electrode position. SWET and TWET forces are used for mixing and producing concentration regions by circulating the fluid at a given location. The effect of forces can be changed with the applied voltage. The TWDEP method is the better method for mixing along the length of the channels among the four options explored in the present work. If two layers of particle suspension are placed side by side in the channel, triangular electrode configuration can be used to mix the suspensions. Triangular and rectangular electrode configurations can efficiently mix two layers of particle suspension placed side-by-side and one-atop-the-other, respectively. Hence, SWDEP forces can be successfully used to create microconcentrators, whereas TWDEP, SWET, and TWET can be used to produce efficient micromixers in a microfluidic chip.
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Affiliation(s)
- Naga Siva Kumar Gunda
- Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta T6G 2G8, Canada
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Cho SW, Kang DK, Choo JB, Demllo AJ, Chang SI. Recent advances in microfluidic technologies for biochemistry and molecular biology. BMB Rep 2011; 44:705-12. [DOI: 10.5483/bmbrep.2011.44.11.705] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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48
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Sridharan S, Zhu J, Hu G, Xuan X. Joule heating effects on electroosmotic flow in insulator-based dielectrophoresis. Electrophoresis 2011; 32:2274-81. [PMID: 21792988 DOI: 10.1002/elps.201100011] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2011] [Revised: 03/27/2011] [Accepted: 04/01/2011] [Indexed: 11/05/2022]
Abstract
Insulator-based dielectrophoresis (iDEP) is an emerging technology that has been successfully used to manipulate a variety of particles in microfluidic devices. However, due to the locally amplified electric field around the in-channel insulator, Joule heating often becomes an unavoidable issue that may disturb the electroosmotic flow and affect the particle motion. This work presents the first experimental study of Joule heating effects on electroosmotic flow in a typical iDEP device, e.g., a constriction microchannel, under DC-biased AC voltages. A numerical model is also developed to simulate the observed flow pattern by solving the coupled electric, energy, and fluid equations in a simplified two-dimensional geometry. It is observed that depending on the magnitude of the DC voltage, a pair of counter-rotating fluid circulations can occur at either the downstream end alone or each end of the channel constriction. Moreover, the pair at the downstream end appears larger in size than that at the upstream end due to DC electroosmotic flow. These fluid circulations, which are reasonably simulated by the numerical model, form as a result of the action of the electric field on Joule heating-induced fluid inhomogeneities in the constriction region.
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Affiliation(s)
- Sriram Sridharan
- Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921, USA
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Gao J, Sin MLY, Liu T, Gau V, Liao JC, Wong PK. Hybrid electrokinetic manipulation in high-conductivity media. LAB ON A CHIP 2011; 11:1770-5. [PMID: 21487576 PMCID: PMC4084846 DOI: 10.1039/c1lc20054b] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
This study reports a hybrid electrokinetic technique for label-free manipulation of pathogenic bacteria in biological samples toward medical diagnostic applications. While most electrokinetic techniques only function in low-conductivity buffers, hybrid electrokinetics enables effective operation in high-conductivity samples, such as physiological fluids (∼1 S m(-1)). The hybrid electrokinetic technique combines short-range electrophoresis and dielectrophoresis, and long-range AC electrothermal flow to improve its effectiveness. The major technical hurdle of electrode instability for manipulating high conductivity samples is tackled by using a Ti-Au-Ti sandwich electrode and a 3-parallel-electrode configuration is designed for continuous isolation of bacteria. The device operates directly with biological samples including urine and buffy coats. We show that pathogenic bacteria and biowarfare agents can be concentrated for over 3 orders of magnitude using hybrid electrokinetics.
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Affiliation(s)
- Jian Gao
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona, 85721, USA. Fax: +1-520-621-8191; Tel: +1-520-626-2215
- Department of Chemical Engineering, Shandong Polytechnic University, Jinan, 250353, China
| | - Mandy L. Y. Sin
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona, 85721, USA. Fax: +1-520-621-8191; Tel: +1-520-626-2215
| | - Tingting Liu
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona, 85721, USA. Fax: +1-520-621-8191; Tel: +1-520-626-2215
| | - Vincent Gau
- GeneFluidics Inc, Monterey Park, California, 91754, USA
| | - Joseph C. Liao
- Department of Urology, Stanford University, Palo Alto, California, 94304, USA
| | - Pak Kin Wong
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona, 85721, USA. Fax: +1-520-621-8191; Tel: +1-520-626-2215
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50
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