151
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Zhou Y, Ma Z, Ai Y. Dynamically tunable elasto-inertial particle focusing and sorting in microfluidics. LAB ON A CHIP 2020; 20:568-581. [PMID: 31894813 DOI: 10.1039/c9lc01071h] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Inertial particle separation using passive hydrodynamic forces has attracted great attention in the microfluidics community because of its operation simplicity and high throughput sample processing. Due to the passive nature of inertial microfluidics, each inertial sorting device is typically fixed to a certain cut-off size for particle separation that is mainly dependent on the channel geometry and dimensions, which however lacks tunability in the separation threshold to fulfill the needs of different sorting applications. In this work, we explore the use of non-Newtonian viscoelastic fluids to achieve size-tunable elasto-inertial particle focusing and sorting in a microfluidic device with reverse wavy channel structures. The balance and competition among inertial lift force, Dean drag force and the controllable elastic lift force give rise to interesting size-based particle focusing phenomena with tunability in the equilibrium focusing positions. Seven differently sized fluorescent microspheres (0.3, 2, 3, 5, 7, 10 and 15 μm) are used to investigate the effects of the flow rate, viscoelastic fluid concentration and particle size on the tunable elasto-inertial focusing behavior. With the sorting tunability, we have achieved a highly effective sorting of a particle mixture into three subpopulations based on the particle size, i.e., small, intermediate and large subpopulations. We even demonstrate the controllable tunability among three separation thresholds for elasto-inertial particle sorting without changing the geometry and dimensions of the microfluidic device. The tunability of the developed elasto-inertial particle focusing and sorting can significantly broaden its application in a variety of biomedical research studies.
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Affiliation(s)
- Yinning Zhou
- Pillar of Engineering Product Development, Singapore University of Technology and Design, Singapore 487372, Singapore.
| | - Zhichao Ma
- Pillar of Engineering Product Development, Singapore University of Technology and Design, Singapore 487372, Singapore.
| | - Ye Ai
- Pillar of Engineering Product Development, Singapore University of Technology and Design, Singapore 487372, Singapore.
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152
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Zhang T, Hong ZY, Tang SY, Li W, Inglis DW, Hosokawa Y, Yalikun Y, Li M. Focusing of sub-micrometer particles in microfluidic devices. LAB ON A CHIP 2020; 20:35-53. [PMID: 31720655 DOI: 10.1039/c9lc00785g] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Sub-micrometer particles (0.10-1.0 μm) are of great significance to study, e.g., microvesicles and protein aggregates are targets for therapeutic intervention, and sub-micrometer fluorescent polystyrene (PS) particles are used as probes for diagnostic imaging. Focusing of sub-micrometer particles - precisely control over the position of sub-micrometer particles in a tightly focused stream - has a wide range of applications in the field of biology, chemistry and environment, by acting as a prerequisite step for downstream detection, manipulation and quantification. Microfluidic devices have been attracting great attention as desirable tools for sub-micrometer particle focusing, due to their small size, low reagent consumption, fast analysis and low cost. Recent advancements in fundamental knowledge and fabrication technologies have enabled microfluidic focusing of particles at sub-micrometer scale in a continuous, label-free and high-throughput manner. Microfluidic methods for the focusing of sub-micrometer particles can be classified into two main groups depending on whether an external field is applied: 1) passive methods, which utilize intrinsic fluidic properties without the need of external actuation, such as inertial, deterministic lateral displacement (DLD), viscoelastic and hydrophoretic focusing; and 2) active methods, where external fields are used, such as dielectrophoretic, thermophoretic, acoustophoretic and optical focusing. This article mainly reviews the studies on the focusing of sub-micrometer particles in microfluidic devices over the past 10 years. It aims to bridge the gap between the focusing of micrometer and nanometer scale (1.0-100 nm) particles and to improve the understanding of development progress, current advances and future prospects in microfluidic focusing techniques.
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Affiliation(s)
- Tianlong Zhang
- Division of Materials Science, Nara Institute of Science and Technology, Nara 630-0192, Japan. and School of Engineering, Macquarie University, Sydney 2122, Australia.
| | - Zhen-Yi Hong
- Division of Materials Science, Nara Institute of Science and Technology, Nara 630-0192, Japan.
| | - Shi-Yang Tang
- School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong 2522, Australia
| | - Weihua Li
- School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong 2522, Australia
| | - David W Inglis
- School of Engineering, Macquarie University, Sydney 2122, Australia.
| | - Yoichiroh Hosokawa
- Division of Materials Science, Nara Institute of Science and Technology, Nara 630-0192, Japan.
| | - Yaxiaer Yalikun
- Division of Materials Science, Nara Institute of Science and Technology, Nara 630-0192, Japan.
| | - Ming Li
- School of Engineering, Macquarie University, Sydney 2122, Australia.
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153
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Zhou J, Peng Z, Papautsky I. Mapping inertial migration in the cross section of a microfluidic channel with high-speed imaging. MICROSYSTEMS & NANOENGINEERING 2020; 6:105. [PMID: 34567714 PMCID: PMC8433405 DOI: 10.1038/s41378-020-00217-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 09/03/2020] [Accepted: 09/04/2020] [Indexed: 05/11/2023]
Abstract
The wide adoption of inertial microfluidics in biomedical research and clinical settings, such as rare cell isolation, has prompted the inquiry of its underlying mechanism. Although tremendous improvement has been made, the mechanism of inertial migration remains to be further elucidated. Contradicting observations are not fully reconciled by the existing theory, and details of the inertial migration within channel cross sections are missing in the literature. In this work, for the first time, we mapped the inertial migration pathways within channel cross section using high-speed imaging at the single-particle level. This is in contrast to the conventional method of particle streak velocimetry (PSV), which provides collective information. We also applied smoothed particle hydrodynamics (SPH) to simulate the transient motion of particles in 3D and obtained cross-sectional migration trajectories that are in agreement with the high-speed imaging results. We found two opposing pathways that explain the contradicting observations in rectangular microchannels, and the force analysis of these pathways revealed two metastable positions near the short walls that can transition into stable positions depending on the flow condition and particle size. These new findings significantly improve our understanding of the inertial migration physics, and enhance our ability to precisely control particle and cell behaviors within microchannels for a broad range of applications.
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Affiliation(s)
- Jian Zhou
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL USA
| | - Zhangli Peng
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL USA
| | - Ian Papautsky
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL USA
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154
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Zhou J, Papautsky I. Viscoelastic microfluidics: progress and challenges. MICROSYSTEMS & NANOENGINEERING 2020; 6:113. [PMID: 34567720 PMCID: PMC8433399 DOI: 10.1038/s41378-020-00218-x] [Citation(s) in RCA: 83] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 09/23/2020] [Accepted: 09/24/2020] [Indexed: 05/12/2023]
Abstract
The manipulation of cells and particles suspended in viscoelastic fluids in microchannels has drawn increasing attention, in part due to the ability for single-stream three-dimensional focusing in simple channel geometries. Improvement in the understanding of non-Newtonian effects on particle dynamics has led to expanding exploration of focusing and sorting particles and cells using viscoelastic microfluidics. Multiple factors, such as the driving forces arising from fluid elasticity and inertia, the effect of fluid rheology, the physical properties of particles and cells, and channel geometry, actively interact and compete together to govern the intricate migration behavior of particles and cells in microchannels. Here, we review the viscoelastic fluid physics and the hydrodynamic forces in such flows and identify three pairs of competing forces/effects that collectively govern viscoelastic migration. We discuss migration dynamics, focusing positions, numerical simulations, and recent progress in viscoelastic microfluidic applications as well as the remaining challenges. Finally, we hope that an improved understanding of viscoelastic flows in microfluidics can lead to increased sophistication of microfluidic platforms in clinical diagnostics and biomedical research.
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Affiliation(s)
- Jian Zhou
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL 60607 USA
| | - Ian Papautsky
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL 60607 USA
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155
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Zhou J, Mukherjee P, Gao H, Luan Q, Papautsky I. Label-free microfluidic sorting of microparticles. APL Bioeng 2019; 3:041504. [PMID: 31832577 PMCID: PMC6906121 DOI: 10.1063/1.5120501] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Accepted: 11/21/2019] [Indexed: 12/11/2022] Open
Abstract
Massive growth of the microfluidics field has triggered numerous advances in focusing, separating, ordering, concentrating, and mixing of microparticles. Microfluidic systems capable of performing these functions are rapidly finding applications in industrial, environmental, and biomedical fields. Passive and label-free methods are one of the major categories of such systems that have received enormous attention owing to device operational simplicity and low costs. With new platforms continuously being proposed, our aim here is to provide an updated overview of the state of the art for passive label-free microparticle separation, with emphasis on performance and operational conditions. In addition to the now common separation approaches using Newtonian flows, such as deterministic lateral displacement, pinched flow fractionation, cross-flow filtration, hydrodynamic filtration, and inertial microfluidics, we also discuss separation approaches using non-Newtonian, viscoelastic flow. We then highlight the newly emerging approach based on shear-induced diffusion, which enables direct processing of complex samples such as untreated whole blood. Finally, we hope that an improved understanding of label-free passive sorting approaches can lead to sophisticated and useful platforms toward automation in industrial, environmental, and biomedical fields.
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Affiliation(s)
- Jian Zhou
- Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois 60607, USA
| | - Prithviraj Mukherjee
- Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois 60607, USA
| | - Hua Gao
- Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois 60607, USA
| | - Qiyue Luan
- Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois 60607, USA
| | - Ian Papautsky
- Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois 60607, USA
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156
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Nam J, Jee H, Jang WS, Yoon J, Park BG, Lee SJ, Lim CS. Sheathless Shape-Based Separation of Candida Albicans Using a Viscoelastic Non-Newtonian Fluid. MICROMACHINES 2019; 10:mi10120817. [PMID: 31779188 PMCID: PMC6952941 DOI: 10.3390/mi10120817] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 11/23/2019] [Accepted: 11/25/2019] [Indexed: 02/07/2023]
Abstract
Rapid and accurate identification of Candida albicans from among other candida species is critical for cost-effective treatment and antifungal drug assays. Shape is a critical biomarker indicating cell type, cell cycle, and environmental conditions; however, most microfluidic techniques have been focused only on size-based particle/cell manipulation. This study demonstrates a sheathless shape-based separation of particles/cells using a viscoelastic non-Newtonian fluid. The size of C. albicans was measured at 37 °C depending on the incubation time (0 h, 1 h, and 2 h). The effects of flow rates on the flow patterns of candida cells with different shapes were examined. Finally, 2-h-incubated candida cells with germ tube formations (≥26 μm) were separated from spherical candida cells and shorter candida cells with a separation efficiency of 80.9% and a purity of 91.2% at 50 μL/min.
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Affiliation(s)
- Jeonghun Nam
- Department of Laboratory Medicine, College of Medicine, Korea University Guro Hospital, Korea University, Seoul 08308, Korea; (W.S.J.); (J.Y.); (B.G.P.)
- Department of Emergency Medicine, College of Medicine, Korea University Guro Hospital, Korea University, Seoul 08308, Korea
- Correspondence: (J.N.); (C.S.L.); Tel.: +82-2-2626-2422 (J.N.); +82-2-2626-3245 (C.S.L.)
| | - Hyunseul Jee
- Department of Medical Sciences, Graduate School of Medicine, Korea University, Seoul 02841, Korea;
| | - Woong Sik Jang
- Department of Laboratory Medicine, College of Medicine, Korea University Guro Hospital, Korea University, Seoul 08308, Korea; (W.S.J.); (J.Y.); (B.G.P.)
- Department of Emergency Medicine, College of Medicine, Korea University Guro Hospital, Korea University, Seoul 08308, Korea
| | - Jung Yoon
- Department of Laboratory Medicine, College of Medicine, Korea University Guro Hospital, Korea University, Seoul 08308, Korea; (W.S.J.); (J.Y.); (B.G.P.)
| | - Borae G. Park
- Department of Laboratory Medicine, College of Medicine, Korea University Guro Hospital, Korea University, Seoul 08308, Korea; (W.S.J.); (J.Y.); (B.G.P.)
| | - Seong Jae Lee
- Department of Polymer Engineering, The University of Suwon, Hwaseong, Gyeonggi 18323, Korea;
| | - Chae Seung Lim
- Department of Laboratory Medicine, College of Medicine, Korea University Guro Hospital, Korea University, Seoul 08308, Korea; (W.S.J.); (J.Y.); (B.G.P.)
- Correspondence: (J.N.); (C.S.L.); Tel.: +82-2-2626-2422 (J.N.); +82-2-2626-3245 (C.S.L.)
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157
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Xiang N, Li Q, Shi Z, Zhou C, Jiang F, Han Y, Ni Z. Low-cost multi-core inertial microfluidic centrifuge for high-throughput cell concentration. Electrophoresis 2019; 41:875-882. [PMID: 31705675 DOI: 10.1002/elps.201900385] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 10/25/2019] [Accepted: 11/05/2019] [Indexed: 12/12/2022]
Abstract
We developed a low-cost multi-core inertial microfluidic centrifuge (IM-centrifuge) to achieve a continuous-flow cell/particle concentration at a throughput of up to 20 mL/min. To lower the cost of our IM-centrifuge, we clamped a disposable multilayer film-based inertial microfluidic (MFIM) chip with two reusable plastic housings. The key MFIM chip was fabricated in low-cost materials by stacking different polymer-film channel layers and double-sided tape. To increase processing throughput, multiplexing spiral inertial microfluidic channels were integrated within an all-in-one MFIM chip, and a novel sample distribution strategy was employed to equally distribute the sample into each channel layer. Then, we characterized the focusing performance in the MFIM chip over a wide flow-rate range. The experimental results showed that our IM-centrifuge was able to focus various-sized particles/cells to achieve volume reduction. The sample distribution strategy also effectively ensured identical focusing and concentration performances in different cores. Finally, our IM-centrifuge was successfully applied to concentrate microalgae cells with irregular shapes and highly polydisperse sizes. Thus, our IM-centrifuge holds the potential to be employed as a low-cost, high-throughput centrifuge for disposable use in low-resource settings.
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Affiliation(s)
- Nan Xiang
- School of Mechanical Engineering, and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, P. R. China
| | - Qiao Li
- School of Mechanical Engineering, and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, P. R. China
| | - Zhiguo Shi
- School of Mechanical Engineering, and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, P. R. China
| | - Chenguang Zhou
- School of Mechanical Engineering, and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, P. R. China
| | - Fengtao Jiang
- School of Mechanical Engineering, and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, P. R. China
| | - Yu Han
- School of Mechanical Engineering, and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, P. R. China
| | - Zhonghua Ni
- School of Mechanical Engineering, and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, P. R. China
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158
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Herrmann N, Neubauer P, Birkholz M. Spiral microfluidic devices for cell separation and sorting in bioprocesses. BIOMICROFLUIDICS 2019; 13:061501. [PMID: 31700559 PMCID: PMC6831504 DOI: 10.1063/1.5125264] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Accepted: 10/14/2019] [Indexed: 05/04/2023]
Abstract
Inertial microfluidic systems have been arousing interest in medical applications due to their simple and cost-efficient use. However, comparably small sample volumes in the microliter and milliliter ranges have so far prevented efficient applications in continuous bioprocesses. Nevertheless, recent studies suggest that these systems are well suited for cell separation in bioprocesses because of their facile adaptability to various reactor sizes and cell types. This review will discuss potential applications of inertial microfluidic cell separation systems in downstream bioprocesses and depict recent advances in inertial microfluidics for bioprocess intensification. This review thereby focusses on spiral microchannels that separate particles at a moderate Reynolds number in a laminar flow (Re < 2300) according to their size by applying lateral hydrodynamic forces. Spiral microchannels have already been shown to be capable of replacing microfilters, extracting dead cells and debris in perfusion processes, and removing contaminant microalgae species. Recent advances in parallelization made it possible to process media on a liter-scale, which might pave the way toward industrial applications.
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Affiliation(s)
- N. Herrmann
- Institute of Biotechnology, Technische Universität Berlin, Ackerstr. 76, 13355 Berlin, Germany
| | - P. Neubauer
- Institute of Biotechnology, Technische Universität Berlin, Ackerstr. 76, 13355 Berlin, Germany
| | - M. Birkholz
- IHP—Leibniz-Institut für innovative Mikroelektronik, Im Technologiepark 25, 15236 Frankfurt (Oder), Germany
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159
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Xuan X. Recent Advances in Continuous-Flow Particle Manipulations Using Magnetic Fluids. MICROMACHINES 2019; 10:E744. [PMID: 31683660 PMCID: PMC6915689 DOI: 10.3390/mi10110744] [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: 10/03/2019] [Revised: 10/28/2019] [Accepted: 10/29/2019] [Indexed: 12/11/2022]
Abstract
Magnetic field-induced particle manipulation is simple and economic as compared to other techniques (e.g., electric, acoustic, and optical) for lab-on-a-chip applications. However, traditional magnetic controls require the particles to be manipulated being magnetizable, which renders it necessary to magnetically label particles that are almost exclusively diamagnetic in nature. In the past decade, magnetic fluids including paramagnetic solutions and ferrofluids have been increasingly used in microfluidic devices to implement label-free manipulations of various types of particles (both synthetic and biological). We review herein the recent advances in this field with focus upon the continuous-flow particle manipulations. Specifically, we review the reported studies on the negative magnetophoresis-induced deflection, focusing, enrichment, separation, and medium exchange of diamagnetic particles in the continuous flow of magnetic fluids through microchannels.
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Affiliation(s)
- Xiangchun Xuan
- Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921, USA.
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160
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Zhou J, Papautsky I. Size-dependent enrichment of leukocytes from undiluted whole blood using shear-induced diffusion. LAB ON A CHIP 2019; 19:3416-3426. [PMID: 31490514 DOI: 10.1039/c9lc00786e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Little work has been done in microfluidics with separation of cells directly from whole blood, and the handful of microfluidic systems reported the literature offer only limited throughput. Yet high throughput is highly desirable to avoid degradation of samples, which can result in loss of information critical to disease diagnosis or monitoring. In this work, we investigated particle migration dynamics in whole blood flow at a single-particle level and subsequently successfully demonstrated the preferential enrichment of white blood cells (WBCs) in unprocessed whole blood flows flanking a buffer flow. Our in-depth investigation reveals a counter-intuitive, size-based migration of cells in whole blood flow and their tendency to accumulate in the regions near flow interfaces, which is employed for inherent enrichment of WBCs. More importantly, we found the strong size-dependent migration in blood flow stemming from the differentiated downstream velocity of particles, which inversely scales with particle size. Our new insights improve understanding of this counterintuitive microfluidics field, offering guidance for new device design to directly handle whole blood and to expand the applications to meet the real-world need for ultra-fast cell separation.
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Affiliation(s)
- Jian Zhou
- University of Illinois Cancer Center, Chicago, IL 60612, USA
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161
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Catarino SO, Rodrigues RO, Pinho D, Miranda JM, Minas G, Lima R. Blood Cells Separation and Sorting Techniques of Passive Microfluidic Devices: From Fabrication to Applications. MICROMACHINES 2019; 10:mi10090593. [PMID: 31510012 PMCID: PMC6780402 DOI: 10.3390/mi10090593] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 09/03/2019] [Accepted: 09/06/2019] [Indexed: 01/23/2023]
Abstract
Since the first microfluidic device was developed more than three decades ago, microfluidics is seen as a technology that exhibits unique features to provide a significant change in the way that modern biology is performed. Blood and blood cells are recognized as important biomarkers of many diseases. Taken advantage of microfluidics assets, changes on blood cell physicochemical properties can be used for fast and accurate clinical diagnosis. In this review, an overview of the microfabrication techniques is given, especially for biomedical applications, as well as a synopsis of some design considerations regarding microfluidic devices. The blood cells separation and sorting techniques were also reviewed, highlighting the main achievements and breakthroughs in the last decades.
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Affiliation(s)
- Susana O Catarino
- Center for MicroElectromechanical Systems (CMEMS-UMinho), University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal
| | - Raquel O Rodrigues
- Center for MicroElectromechanical Systems (CMEMS-UMinho), University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal
| | - Diana Pinho
- Research Centre in Digitalization and Intelligent Robotics (CeDRI), Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal
- CEFT, Faculdade de Engenharia da Universidade do Porto (FEUP), Rua Roberto Frias, 4200-465 Porto, Portugal
| | - João M Miranda
- CEFT, Faculdade de Engenharia da Universidade do Porto (FEUP), Rua Roberto Frias, 4200-465 Porto, Portugal
| | - Graça Minas
- Center for MicroElectromechanical Systems (CMEMS-UMinho), University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal
| | - Rui Lima
- CEFT, Faculdade de Engenharia da Universidade do Porto (FEUP), Rua Roberto Frias, 4200-465 Porto, Portugal.
- MEtRICs, Mechanical Engineering Department, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal.
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162
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Volpe A, Gaudiuso C, Ancona A. Sorting of Particles Using Inertial Focusing and Laminar Vortex Technology: A Review. MICROMACHINES 2019; 10:E594. [PMID: 31510006 PMCID: PMC6780945 DOI: 10.3390/mi10090594] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 08/29/2019] [Accepted: 09/07/2019] [Indexed: 12/11/2022]
Abstract
The capability of isolating and sorting specific types of cells is crucial in life science, particularly for the early diagnosis of lethal diseases and monitoring of medical treatments. Among all the micro-fluidics techniques for cell sorting, inertial focusing combined with the laminar vortex technology is a powerful method to isolate cells from flowing samples in an efficient manner. This label-free method does not require any external force to be applied, and allows high throughput and continuous sample separation, thus offering a high filtration efficiency over a wide range of particle sizes. Although rather recent, this technology and its applications are rapidly growing, thanks to the development of new chip designs, the employment of new materials and microfabrication technologies. In this review, a comprehensive overview is provided on the most relevant works which employ inertial focusing and laminar vortex technology to sort particles. After briefly summarizing the other cells sorting techniques, highlighting their limitations, the physical mechanisms involved in particle trapping and sorting are described. Then, the materials and microfabrication methods used to implement this technology on miniaturized devices are illustrated. The most relevant evolution steps in the chips design are discussed, and their performances critically analyzed to suggest future developments of this technology.
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Affiliation(s)
- Annalisa Volpe
- Physics Department, Università degli Studi di Bari 'Aldo Moro', Via G. Amendola 173, 70126 Bari, Italy.
- Institute for Photonics and Nanotechnologies (IFN), National Research Council, Via Amendola 173, 70126 Bari, Italy.
| | - Caterina Gaudiuso
- Physics Department, Università degli Studi di Bari 'Aldo Moro', Via G. Amendola 173, 70126 Bari, Italy
- Institute for Photonics and Nanotechnologies (IFN), National Research Council, Via Amendola 173, 70126 Bari, Italy
| | - Antonio Ancona
- Institute for Photonics and Nanotechnologies (IFN), National Research Council, Via Amendola 173, 70126 Bari, Italy
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163
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Exploring contraction–expansion inertial microfluidic‐based particle separation devices integrated with curved channels. AIChE J 2019. [DOI: 10.1002/aic.16741] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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164
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Hymel SJ, Lan H, Fujioka H, Khismatullin DB. Cell trapping in Y-junction microchannels: A numerical study of the bifurcation angle effect in inertial microfluidics. PHYSICS OF FLUIDS (WOODBURY, N.Y. : 1994) 2019; 31:082003. [PMID: 31406457 PMCID: PMC6688893 DOI: 10.1063/1.5113516] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 07/09/2019] [Indexed: 05/31/2023]
Abstract
The majority of microfluidic technologies for cell sorting and isolation involve bifurcating (e.g., Y- or T-shaped junction) microchannels to trap the cells of a specific type. However, the microfluidic trapping efficiency remains low, independently of whether the cells are separated by a passive or an active sorting method. Using a custom computational algorithm, we studied the migration of separated deformable cells in a Y-junction microchannel, with a bifurcation angle ranging from 30° to 180°. Single or two cells of initially spherical shape were considered under flow conditions corresponding to inertial microfluidics. Through the numerical simulation, we identified the effects of cell size, cytoplasmic viscoelasticity, cortical tension, flow rate, and bifurcation angle on the critical separation distance for cell trapping. The results of this study show that the trapping and isolation of blood cells, and circulating tumor cells in a Y-junction microchannel was most efficient and least dependent on the flow rate at the bifurcation angle of 120°. At this angle, the trapping efficiency for white blood cells and circulating tumor cells increased, respectively, by 46% and 43%, in comparison with the trapping efficiency at 60°. The efficiency to isolate invasive tumor cells from noninvasive ones increased by 32%. This numerical study provides important design criteria to optimize microfluidic technology for deformability-based cell sorting and isolation.
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Affiliation(s)
| | - Hongzhi Lan
- Department of Pediatrics, Stanford University, Stanford, California 94305, USA
| | - Hideki Fujioka
- Center for Computational Science, Tulane University, New Orleans, Louisiana 70118, USA
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165
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Mutafopulos K, Spink P, Lofstrom CD, Lu PJ, Lu H, Sharpe JC, Franke T, Weitz DA. Traveling surface acoustic wave (TSAW) microfluidic fluorescence activated cell sorter (μFACS). LAB ON A CHIP 2019; 19:2435-2443. [PMID: 31192328 DOI: 10.1039/c9lc00163h] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
We report a microfluidic fluorescence activated cell-sorting (μFACS) device that employs traveling surface acoustic waves (TSAW) to sort cells at rates comparable to conventional jet-in-air FACS machines, with high purity and viability. The device combines inertial flow focusing and sheath flow to align and evenly space cells, improving the sorting accuracy and screening rate. We sort with an interdigital transducer (IDT) whose tapered geometry allows precise positioning of the TSAW for optimal cell sorting. We sort three different cell lines at several kHz, at cell velocities exceeding one meter per second, while maintaining both sorting purity and cell viability at around 90% simultaneously.
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Affiliation(s)
- K Mutafopulos
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.
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166
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Mashhadian A, Shamloo A. Inertial microfluidics: A method for fast prediction of focusing pattern of particles in the cross section of the channel. Anal Chim Acta 2019; 1083:137-149. [PMID: 31493804 DOI: 10.1016/j.aca.2019.06.057] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 06/24/2019] [Accepted: 06/26/2019] [Indexed: 12/13/2022]
Abstract
Inertial microfluidics is utilized as a powerful passive method for particle and cell manipulation, which uses the hydrodynamic forces of the fluid in the channel to focus particles in specific equilibrium positions in the cross section of the channel. To achieve high performance manipulation, knowledge of focusing pattern of particles in the cross section of channel is essential. In this paper, we propose a method to address this important issue. To this end, firstly inertial microfluidics is analyzed in rectangular cross section channels. The results indicate that fluid flow velocity and channel's cross-sectional profiles have great impacts on the forces exerted on particles. Next, these results are utilized to propose a method to predict equilibrium positions in non-rectangular cross section channels through some simple calculations. This method is based on approximating the velocity profile of a non-rectangular cross section channel by utilizing portions of velocity profiles of different rectangular cross section channels. To analyze the method's performance, results obtained from the proposed method are compared with Direct Numerical Simulation (DNS) and experimental studies of seven non-rectangular channels. It is observed that the proposed approach accurately predicts particles trajectories and their equilibrium positions in the cross section of channels.
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Affiliation(s)
- Ali Mashhadian
- School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran
| | - Amir Shamloo
- School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran.
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167
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Condina MR, Dilmetz BA, Razavi Bazaz S, Meneses J, Ebrahimi Warkiani M, Hoffmann P. Rapid separation and identification of beer spoilage bacteria by inertial microfluidics and MALDI-TOF mass spectrometry. LAB ON A CHIP 2019; 19:1961-1970. [PMID: 31099359 DOI: 10.1039/c9lc00152b] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOF MS), in combination with Biotyper software, is a rapid, high-throughput, and accurate method for the identification of microbes. Microbial outbreaks in a brewery present a major risk for companies as it can lead to cost-intensive recalls and damage to the brand reputation. MALDI-TOF MS has been implemented into a brewery setting for quality control practices and the identification of beer spoilage microorganisms. However, the applicability of this approach is hindered by compatibility issues associated with mixed cultures, requiring the use of time-consuming selective cultivation techniques prior to identification. We propose a novel, low-cost approach based on the combination of inertial microfluidics and secondary flows in a spiral microchannel for high-throughput and efficient separation of yeasts (Saccharomyces pastorianus and Saccharomyces cerevisiae) from beer spoilage microorganisms (Lactobacillus brevis and Pediococcus damnosus). Flow rates were optimised using S. pastorianus and L. brevis, leading to separation of more than 90% of the L. brevis cells from yeast. The microorganisms were then identified to the species level using the MALDI-TOF MS platform using standard sample preparation protocols. This study shows the high-throughput and rapid separation of spoilage microorganisms (0.3-3 μm) from background yeast (5 μm) from beer, subsequent identification using MALDI Biotyper, and the potential applicability of the approach for biological control in the brewing industry.
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Affiliation(s)
- Mark R Condina
- Future Industries Institute, University of South Australia, Adelaide, Australia.
| | - Brooke A Dilmetz
- Future Industries Institute, University of South Australia, Adelaide, Australia.
| | - Sajad Razavi Bazaz
- School of Biomedical Engineering, University of Technology Sydney, Australia.
| | | | - Majid Ebrahimi Warkiani
- School of Biomedical Engineering, University of Technology Sydney, Australia. and Institute of Molecular Medicine, Sechenov University, Moscow 119991, Russia
| | - Peter Hoffmann
- Future Industries Institute, University of South Australia, Adelaide, Australia.
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168
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Rafeie M, Hosseinzadeh S, Taylor RA, Warkiani ME. New insights into the physics of inertial microfluidics in curved microchannels. I. Relaxing the fixed inflection point assumption. BIOMICROFLUIDICS 2019; 13:034117. [PMID: 31431813 PMCID: PMC6697030 DOI: 10.1063/1.5109004] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Accepted: 06/12/2019] [Indexed: 05/08/2023]
Abstract
Inertial microfluidics represents a powerful new tool for accurately positioning cells and microparticles within fluids for a variety of biomedical, clinical, and industrial applications. In spite of enormous advancements in the science and design of these devices, particularly in curved microfluidic channels, contradictory experimental results have confounded researchers and limited progress. Thus, at present, a complete theory which describes the underlying physics is lacking. We propose that this bottleneck is due to one simple mistaken assumption-the locations of inflection points of the Dean velocity profile in curved microchannels are not fixed, but can actually shift with the flow rate. Herein, we propose that the dynamic distance (δ) between the real equilibrium positions and their nearest inflection points can clearly explain several (previously) unexplained phenomena in inertial microfluidic systems. More interestingly, we found that this parameter, δ, is a function of several geometric and operational parameters, all of which are investigated (in detail) here with a series of experiments and simulations of different spiral microchannels. This key piece of understanding is expected to open the door for researchers to develop new and more effective inertial microfluidic designs.
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Affiliation(s)
- Mehdi Rafeie
- School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Shahin Hosseinzadeh
- School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia
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169
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Raoufi MA, Mashhadian A, Niazmand H, Asadnia M, Razmjou A, Warkiani ME. Experimental and numerical study of elasto-inertial focusing in straight channels. BIOMICROFLUIDICS 2019; 13:034103. [PMID: 31123535 PMCID: PMC6509046 DOI: 10.1063/1.5093345] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 04/22/2019] [Indexed: 05/06/2023]
Abstract
Elasto-inertial microfluidics has drawn significant attention in recent years due to its enhanced capabilities compared to pure inertial systems in control of small microparticles. Previous investigations have focused mainly on the applications of elasto-inertial sorting, rather than studying its fundamentals. This is because of the complexity of simulation and analysis, due to the presence of viscoelastic force. There have been some investigative efforts on the mechanisms of elasto-inertial focusing in straight channels; however, these studies were limited to simple rectangular channels and neglected the effects of geometry and flow rates on focusing positions. Herein, for the first time, we experimentally and numerically explore the effects of elasticity accompanying channel cross-sectional geometry and sample flow rates on the focusing phenomenon in elasto-inertial systems. The results reveal that increasing the aspect ratio weakens the elastic force more than inertial force, causing a transition from one focusing position to two. In addition, they show that increasing the angle of a channel corner causes the elastic force to push the particles more efficiently toward the center over a larger area of the channel cross section. Following on from this, we proposed a new complex straight channel which demonstrates a tighter focusing band compared to other channel geometries. Finally, we focused Saccharomyces cerevisiae cells (3-5 μm) in the complex channel to showcase its capability in focusing small-size particles. We believe that this research work improves the understanding of focusing mechanisms in viscoelastic solutions and provides useful insights into the design of elasto-inertial microfluidic devices.
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Affiliation(s)
| | - Ali Mashhadian
- Department of Mechanical Engineering, Sharif University, Tehran, Iran
| | - Hamid Niazmand
- Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Mohsen Asadnia
- School of Engineering, Macquarie University, Sydney 2109, NSW, Australia
| | - Amir Razmjou
- UNESCO Center for Membrane Science and Technology, School of Chemical Science and Engineering, University of New South Wales, Sydney 2052, NSW, Australia
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170
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Moloudi R, Oh S, Yang C, Teo KL, Lam ATL, Ebrahimi Warkiani M, Win Naing M. Scaled-Up Inertial Microfluidics: Retention System for Microcarrier-Based Suspension Cultures. Biotechnol J 2019; 14:e1800674. [PMID: 30791214 DOI: 10.1002/biot.201800674] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 12/23/2018] [Indexed: 01/09/2023]
Abstract
Recently, particle concentration and filtration using inertial microfluidics have drawn attention as an alternative to membrane and centrifugal technologies for industrial applications, where the target particle size varies between 1 µm and 500 µm. Inevitably, the bigger particle size (>50 µm) mandates scaling up the channel cross-section or hydraulic diameter (DH > 0.5 mm). The Dean-coupled inertial focusing dynamics in spiral microchannels is studied broadly; however, the impacts of secondary flow on particle migration in a scaled-up spiral channel is not fully elucidated. The mechanism of particle focusing inside scaled-up rectangular and trapezoidal spiral channels (i.e., 5-10× bigger than conventional microchannels) with an aim to develop a continuous and clog-free microfiltration system for bioprocessing is studied in detail. Herein, a unique focusing based on inflection point without the aid of sheath flow is reported. This new focusing mechanism, observed in the scaled-up channels, out-performs the conventional focusing scenarios in the previously reported trapezoidal and rectangular channels. Finally, as a proof-of-concept, the utility of this device is showcased for the first time as a retention system for a cell-microcarrier (MC) suspension culture.
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Affiliation(s)
- Reza Moloudi
- School of Mechanical and Aerospace Engineering, Nanyang Technological University (NTU), 50 Nanyang Avenue, Singapore, 639798.,Bio-Manufacturing Programme, Singapore Institute of Manufacturing Technology (SIMTech), Agency for Science, Technology and Research (A*STAR), Innovis, Singapore, 138634
| | - Steve Oh
- Stem Cell Group, Bioprocessing Technology Institute, Agency for Science, Technology and Research (A*STAR), Centros, Singapore, 138668
| | - Chun Yang
- School of Mechanical and Aerospace Engineering, Nanyang Technological University (NTU), 50 Nanyang Avenue, Singapore, 639798
| | - Kim Leng Teo
- Stem Cell Group, Bioprocessing Technology Institute, Agency for Science, Technology and Research (A*STAR), Centros, Singapore, 138668
| | - Alan Tin-Lun Lam
- Stem Cell Group, Bioprocessing Technology Institute, Agency for Science, Technology and Research (A*STAR), Centros, Singapore, 138668
| | - Majid Ebrahimi Warkiani
- School of Biomedical Engineering, Center for Health Technologies, University of Technology Sydney, Ultimo, Sydney, NSW, 2007, Australia.,Institute of Molecular Medicine, Sechenov University, Moscow, Russia, 119146
| | - May Win Naing
- Bio-Manufacturing Programme, Singapore Institute of Manufacturing Technology (SIMTech), Agency for Science, Technology and Research (A*STAR), Innovis, Singapore, 138634
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171
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Microfluidics-Based Organism Isolation from Whole Blood: An Emerging Tool for Bloodstream Infection Diagnosis. Ann Biomed Eng 2019; 47:1657-1674. [PMID: 30980291 DOI: 10.1007/s10439-019-02256-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Accepted: 03/27/2019] [Indexed: 12/11/2022]
Abstract
The diagnosis of bloodstream infections presents numerous challenges, in part, due to the low concentration of pathogens present in the peripheral bloodstream. As an alternative to existing time-consuming, culture-based diagnostic methods for organism identification, microfluidic devices have emerged as rapid, high-throughput and integrated platforms for bacterial and fungal enrichment, detection, and characterization. This focused review serves to highlight and compare the emerging microfluidic platforms designed for the isolation of sepsis-causing pathogens from blood and suggest important areas for future research.
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172
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Xiang N, Zhang R, Han Y, Ni Z. A Multilayer Polymer-Film Inertial Microfluidic Device for High-Throughput Cell Concentration. Anal Chem 2019; 91:5461-5468. [DOI: 10.1021/acs.analchem.9b01116] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Nan Xiang
- School of Mechanical Engineering, and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, People’s Republic of China
| | - Rui Zhang
- School of Mechanical Engineering, and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, People’s Republic of China
| | - Yu Han
- School of Mechanical Engineering, and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, People’s Republic of China
| | - Zhonghua Ni
- School of Mechanical Engineering, and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, People’s Republic of China
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173
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Cruz J, Graells T, Walldén M, Hjort K. Inertial focusing with sub-micron resolution for separation of bacteria. LAB ON A CHIP 2019; 19:1257-1266. [PMID: 30821308 DOI: 10.1039/c9lc00080a] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
In this paper, we study inertial focusing in curved channels and demonstrate the alignment of particles with diameters between 0.5 and 2.0 μm, a range of biological relevance since it comprises a multitude of bacteria and organelles of eukaryotic cells. The devices offer very sensitive control over the equilibrium positions and allow two modes of operation. In the first, particles having a large variation in size are focused and concentrated together. In the second, the distribution spreads in a range of sizes achieving separation with sub-micron resolution. These systems were validated with three bacteria species (Escherichia coli, Salmonella typhimurium and Klebsiella pneumoniae) showing good alignment while maintaining the viability in all cases. The experiments also revealed that the particles follow a helicoidal trajectory to reach the equilibrium positions, similar to the fluid streamlines simulated in COMSOL, implying that these positions occupy different heights in the cross section. When the equilibrium positions move to the inner wall as the flow rate increases, they are at a similar distance from the centre than in straight channels (∼0.6R), but when the equilibrium positions move to the outer wall as the flow rate increases, they are closer to the centre and the particles pass close to the inner wall to elevate their position before reaching them. These observations were used along with COMSOL simulations to explain the mechanism behind the local force balance and the migration of particles, which we believe contributes to further understanding of the phenomenon. Hopefully, this will make designing more intuitive and reduce the high pressure demands, enabling manipulation of particles much smaller than a micrometer.
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Affiliation(s)
- Javier Cruz
- Engineering Sciences, Uppsala University, Ångström Laboratoriet, Uppsala, Sweden.
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174
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Chung AJ. A Minireview on Inertial Microfluidics Fundamentals: Inertial Particle Focusing and Secondary Flow. BIOCHIP JOURNAL 2019. [DOI: 10.1007/s13206-019-3110-1] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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175
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Donath A, Kantzas A, Bryant S. Opportunities for Particles and Particle Suspensions to Experience Enhanced Transport in Porous Media: A Review. Transp Porous Media 2019. [DOI: 10.1007/s11242-019-01256-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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176
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Viscoelastic Separation and Concentration of Fungi from Blood for Highly Sensitive Molecular Diagnostics. Sci Rep 2019; 9:3067. [PMID: 30816161 PMCID: PMC6395622 DOI: 10.1038/s41598-019-39175-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Accepted: 01/18/2019] [Indexed: 12/30/2022] Open
Abstract
Isolation and concentration of fungi in the blood improves sensitivity of the polymerase chain reaction (PCR) method to detect fungi in blood. This study demonstrates a sheathless, continuous separation and concentration method of candida cells using a viscoelastic fluid that enables rapid detection of rare candida cells by PCR analysis. To validate device performance using a viscoelastic fluid, flow characteristics of 2 μm particles were estimated at different flow rates. Additionally, a mixture of 2 μm and 13 μm particles was successfully separated based on size difference at 100 μl/min. Candida cells were successfully separated from the white blood cells (WBCs) with a separation efficiency of 99.1% and concentrated approximately 9.9-fold at the center outlet compared to the initial concentration (~2.5 × 107 cells/ml). Sequential 1st and 2nd concentration processes were used to increase the final number of candida cells to ~2.3 × 109 cells/ml, which was concentrated ~92-fold. Finally, despite the undetectable initial concentration of 101 CFU/ml, removal of WBCs and the additional buffer solution enabled the quantitative reverse transcription (RT)-PCR detection of candida cells after the 1st concentration (Ct = 31.43) and the 2nd concentration process (Ct = 29.30).
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177
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Schaaf C, Rühle F, Stark H. A flowing pair of particles in inertial microfluidics. SOFT MATTER 2019; 15:1988-1998. [PMID: 30714602 DOI: 10.1039/c8sm02476f] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A flowing pair of particles in inertial microfluidics gives important insights into understanding and controlling the collective dynamics of particles like cells or droplets in microfluidic devices. They are applied in medical cell analysis and engineering. We study the dynamics of a pair of solid particles flowing through a rectangular microchannel using lattice Boltzmann simulations. We determine the inertial lift force profiles as a function of the two particle positions, their axial distance, and the Reynolds number. Generally, the profiles strongly differ between particles leading and lagging in flow and the lift forces are enhanced due to the presence of a second particle. At small axial distances, they are determined by viscous forces, while inertial forces dominate at large separations. We identify cross-streamline pairs as stable fixed points in the lift force profiles and argue that same-streamline configurations are only one-sided stable. Depending on the initial conditions, the two-particle lift forces in combination with the Poiseuille flow give rise to three types of unbound particle trajectories, called moving-apart, passing, and swapping, and one type of bound trajectory, where the particles perform damped oscillations towards the cross-stream line configuration. The damping rate scales with Reynolds number squared, since inertial forces are responsible for driving the particles to their steady-state positions.
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Affiliation(s)
- Christian Schaaf
- Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany.
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178
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Fuchs BB, Eatemadpour S, Martel-Foley JM, Stott S, Toner M, Mylonakis E. Rapid Isolation and Concentration of Pathogenic Fungi Using Inertial Focusing on a Chip-Based Platform. Front Cell Infect Microbiol 2019; 9:27. [PMID: 30809512 PMCID: PMC6379272 DOI: 10.3389/fcimb.2019.00027] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Accepted: 01/25/2019] [Indexed: 11/13/2022] Open
Abstract
Systemic Candida infections remain a leading cause of nosocomial infections in the United States and worldwide. Many challenges remain in achieving rapid, direct diagnosis of fungal bloodstream infections due to limitations of conventional diagnostic methods that continue to demonstrate poor sensitivity, prolonged culture times that lead to delayed treatment, and detection variability between tests that compromises result reproducibility. Despite advancements in technology, mortality, and cost of care presented by blood stream infection with Candida spp. (candidemia) continues to rise and there is an urgent need for the development of novel methods to accurately detect Candida species present within the blood. This is especially true when patients are infected with drug resistant strains of Candida where accurate and immediate therapeutic treatment is of the importance. This study presents a method of separating fungal cells from lysed blood using inertial forces applied through microfluidics in order to abbreviate the time required to achieve a diagnosis by mitigating the need to grow blood cultures. We found that C. albicans can segregate into a focused stream distinct from white blood cells isolated within the Inertial Fungal Focuser (IFF) after red blood cell lysis. As a result of the focusing process, the collected cells are also concentrated 2.86 times. The same IFF device is applicable to non-albicans species: Candida parapsilosis, Candida glabrata, and Candida tropicalis, providing both isolation from lysed blood and a reduction in solution volume. Thus, the devised platform provides a means to isolate medically significant fungal cells from blood and concentrate the cells for further interrogation.
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Affiliation(s)
- Beth Burgwyn Fuchs
- Rhode Island Hospital, Alpert Medical School and Brown University, Providence, RI, United States
| | - Soraya Eatemadpour
- Rhode Island Hospital, Alpert Medical School and Brown University, Providence, RI, United States
| | - Joseph M Martel-Foley
- BioMEMS Resource Center, Center for Engineering in Medicine and Surgical Services, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Shannon Stott
- BioMEMS Resource Center, Center for Engineering in Medicine and Surgical Services, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Mehmet Toner
- The Center for Engineering in Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Eleftherios Mylonakis
- Rhode Island Hospital, Alpert Medical School and Brown University, Providence, RI, United States
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179
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Zhang J, Yuan D, Zhao Q, Teo AJT, Yan S, Ooi CH, Li W, Nguyen NT. Fundamentals of Differential Particle Inertial Focusing in Symmetric Sinusoidal Microchannels. Anal Chem 2019; 91:4077-4084. [DOI: 10.1021/acs.analchem.8b05712] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Jun Zhang
- Queensland Micro and Nanotechnology Centre, Griffith University, Brisbane, Queensland 4111, Australia
| | - Dan Yuan
- School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, New South Wales 2522, Australia
| | - Qianbin Zhao
- School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, New South Wales 2522, Australia
| | - Adrian J. T. Teo
- Queensland Micro and Nanotechnology Centre, Griffith University, Brisbane, Queensland 4111, Australia
| | - Sheng Yan
- Department of Chemistry, University of Tokyo, Tokyo 113-0033, Japan
| | - Chin Hong Ooi
- Queensland Micro and Nanotechnology Centre, Griffith University, Brisbane, Queensland 4111, Australia
| | - Weihua Li
- School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, New South Wales 2522, Australia
| | - Nam-Trung Nguyen
- Queensland Micro and Nanotechnology Centre, Griffith University, Brisbane, Queensland 4111, Australia
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180
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Kulasinghe A, Zhou J, Kenny L, Papautsky I, Punyadeera C. Capture of Circulating Tumour Cell Clusters Using Straight Microfluidic Chips. Cancers (Basel) 2019; 11:E89. [PMID: 30646614 PMCID: PMC6356955 DOI: 10.3390/cancers11010089] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 01/07/2019] [Accepted: 01/08/2019] [Indexed: 12/29/2022] Open
Abstract
Circulating tumour cells (CTCs) are the metastatic precursors to distant disease in head and neck cancers (HNCs). Whilst the prognostic and predictive value of single CTCs have been well documented, the role of CTC clusters, which potentially have a higher metastatic capacity are limited. In this study, the authors used a novel straight microfluidic chip to focus and capture CTCs. The chip offers high cell recoveries with clinically relevant numbers (10⁻500 cells/mL) without the need for further purification. Single CTCs were identified in 10/21 patient samples (range 2⁻24 CTCs/mL), CTC clusters in 9/21 patient samples (range 1⁻6 CTC clusters/mL) and circulating tumour microemboli (CTM) in 2/21 samples. This study demonstrated that CTC clusters contain EGFR amplified single CTCs within the cluster volume. This novel microfluidic chip demonstrates the efficient sorting and preservation of single CTCs, CTC clusters and CTMs. The authors intend to expand this study to a larger cohort to determine the clinical implication of the CTC subsets in HNC.
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Affiliation(s)
- Arutha Kulasinghe
- The School of Biomedical Sciences, Institute of Health and Biomedical Innovation, Queensland University of Technology, Kelvin Grove, QLD 4059, Australia.
- Translational Research Institute, Brisbane, QLD 4102, Australia.
| | - Jian Zhou
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL 60607, USA.
- University of Illinois Cancer Center, Chicago, IL 60612, USA.
| | - Liz Kenny
- School of Medicine, University of Queensland, QLD 4029, Australia.
- Central Integrated Regional Cancer Services, Royal Brisbane and Women's Hospital, Queensland Health, QLD 4029, Australia.
| | - Ian Papautsky
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL 60607, USA.
- University of Illinois Cancer Center, Chicago, IL 60612, USA.
| | - Chamindie Punyadeera
- The School of Biomedical Sciences, Institute of Health and Biomedical Innovation, Queensland University of Technology, Kelvin Grove, QLD 4059, Australia.
- Translational Research Institute, Brisbane, QLD 4102, Australia.
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181
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Design and Fabrication of a Novel Microfluidic System for Enrichment of Circulating Tumor Cells with the Assistance of Computer Simulations. Avicenna J Med Biotechnol 2019; 11:277-284. [PMID: 31908735 PMCID: PMC6925400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Cancer is the first cause of death in developed countries. The heterogeneous nature of cancer requires patient-specified treatment plans. One reliable approach is collecting Circulating Tumour Cells (CTCs) and using them for prognosis and drug response assessment purposes. CTCs are rare and their separation from normal cell requires high-accuracy methods. METHODS A microfluidic cell capture device to separate CTCs from peripheral blood is presented in this study. The CTC separation device applies hydrodynamic forces to categorize cells according to their sizes. The proposed device is designed and evaluated by numerical simulations and validated experimentally. The simulation modified design was fabricated by soft lithography which allows prototyping the device in a few hours. For experimental setup two solutions: 1) fixed cells spiked in Phosphate Buffered Saline (PBS), and 2) fixed cells in blood were used. The CTC separation device was validated by tracking the flow and separation of cancer cell lines in the solutions. RESULTS It is demonstrated that the setup is capable of CTC enrichment up to 50 times. CONCLUSION The presented CTC enrichment method reduces costs by eliminating the use of antibodies. The high-throughput method has the potential to be used in preclinical studies of cancer.
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182
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Liu N, Petchakup C, Tay HM, Li KHH, Hou HW. Spiral Inertial Microfluidics for Cell Separation and Biomedical Applications. Bioanalysis 2019. [DOI: 10.1007/978-981-13-6229-3_5] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
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183
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Mukherjee P, Wang X, Zhou J, Papautsky I. Single stream inertial focusing in low aspect-ratio triangular microchannels. LAB ON A CHIP 2018; 19:147-157. [PMID: 30488049 DOI: 10.1039/c8lc00973b] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
A wide range of microfluidic devices for single stream focusing of cells and particles has emerged in recent years, based on both passive and active methods. Inertial microfluidics offers an attractive alternative to these methods, providing efficient and sheathless passive focusing of cells and beads. Nevertheless, in rectangular microchannels, the presence of multiple equilibrium positions necessitates complicated solutions involving manipulation of the 3D structure in order to achieve single stream flows. Here, we present a new approach to single-stream inertial focusing based on a triangular microchannel geometry. Changing the channel cross-sectional shape leads to asymmetry in the velocity profile, resulting in a size-dependent single stable equilibrium position near the channel apex. We demonstrate that soft lithography masters for such microchannels can be fabricated using PMMA through micromilling, and 15 μm diameter beads can be efficiently focused into a single stream. Confocal microscopy was used to confirm the focusing positions in the microchannel cross-section. We further integrated this device with a laser counting system to form a sheathless flow cytometer and demonstrated the counting of beads with an ∼326 s -1 throughput. The use of a triangular cross-section offers a number of benefits, including simplicity of the fundamental principle and geometry, control of design, a small footprint, and ease of integration, as well as high-precision single position focusing.
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Affiliation(s)
- Prithviraj Mukherjee
- Department of Bioengineering, University of Illinois at Chicago, 851 S. Morgan Street, 218 SEO, Chicago, IL 60607, USA.
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184
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Tan F, Wang T, Wang H, Zheng Y. Microfluidic techniques for tumor cell detection. Electrophoresis 2018; 40:1230-1244. [PMID: 30548633 DOI: 10.1002/elps.201800413] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Revised: 11/20/2018] [Accepted: 12/02/2018] [Indexed: 11/09/2022]
Abstract
Cancer metastasis is the main cause of cancer-related death. Early detection of tumor cell in peripheral blood is of great significant to early diagnosis and effective treatment of cancer. Over the past two decades, microfluidic technologies have been demonstrated to have great potential for isolating and detecting tumor cell from blood. The present paper reviews microfluidic techniques for tumor cell detection based on various physical principles. The specific methods are categorized into active and passive methods depending on whether extra force field is applied. Working principles of the two methods are explained in detail, including microfluidics combined with optical tweezer, electric field, magnetic field, acoustophoresis, and without extra fields for tumor cell detection. Typical experiments and the results are reviewed. Based on these, research characteristics of the two methods are analyzed.
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Affiliation(s)
- Feifei Tan
- College of Communication Engineering, Chengdu University of Information Technology, Chengdu, Sichuan, P. R. China
| | - Tianbao Wang
- College of Communication Engineering, Chengdu University of Information Technology, Chengdu, Sichuan, P. R. China
| | - Haishi Wang
- College of Communication Engineering, Chengdu University of Information Technology, Chengdu, Sichuan, P. R. China
| | - Yuzheng Zheng
- College of Communication Engineering, Chengdu University of Information Technology, Chengdu, Sichuan, P. R. China
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185
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Affiliation(s)
- Daniel Stoecklein
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Dino Di Carlo
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, California 90095, United States
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186
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Alam MK, Koomson E, Zou H, Yi C, Li CW, Xu T, Yang M. Recent advances in microfluidic technology for manipulation and analysis of biological cells (2007–2017). Anal Chim Acta 2018; 1044:29-65. [DOI: 10.1016/j.aca.2018.06.054] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 06/19/2018] [Accepted: 06/19/2018] [Indexed: 12/17/2022]
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187
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Huang Y, Marson RL, Larson RG. Inertial migration of a rigid sphere in plane Poiseuille flow as a test of dissipative particle dynamics simulations. J Chem Phys 2018; 149:164912. [DOI: 10.1063/1.5047923] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Yuanding Huang
- School of Mechatronics Engineering, Harbin Institute of Technology, Heilongjiang 150001, People’s Republic of China
- Department of Chemical Engineering, Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Ryan L. Marson
- Department of Chemical Engineering, Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, USA
- The Dow Chemical Company, Core R & D, Midland, Michigan 48674, USA
| | - Ronald G. Larson
- Department of Chemical Engineering, Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, USA
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188
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Tang W, Jiang D, Li Z, Zhu L, Shi J, Yang J, Xiang N. Recent advances in microfluidic cell sorting techniques based on both physical and biochemical principles. Electrophoresis 2018; 40:930-954. [DOI: 10.1002/elps.201800361] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Revised: 09/28/2018] [Accepted: 09/30/2018] [Indexed: 01/13/2023]
Affiliation(s)
- Wenlai Tang
- School of Electrical and Automation Engineering; Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing; Nanjing Normal University; P. R. China
- Nanjing Institute of Intelligent High-end Equipment Industry Co., Ltd.; P. R. China
| | - Di Jiang
- School of Mechanical and Electronic Engineering; Nanjing Forestry University; P. R. China
| | - Zongan Li
- School of Electrical and Automation Engineering; Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing; Nanjing Normal University; P. R. China
| | - Liya Zhu
- School of Electrical and Automation Engineering; Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing; Nanjing Normal University; P. R. China
| | - Jianping Shi
- School of Electrical and Automation Engineering; Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing; Nanjing Normal University; P. R. China
| | - Jiquan Yang
- School of Electrical and Automation Engineering; Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing; Nanjing Normal University; P. R. China
- Nanjing Institute of Intelligent High-end Equipment Industry Co., Ltd.; P. R. China
| | - Nan Xiang
- School of Mechanical Engineering; Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments; Southeast University; P. R. China
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189
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Wang W, Luo J, Wang S. Recent Progress in Isolation and Detection of Extracellular Vesicles for Cancer Diagnostics. Adv Healthc Mater 2018; 7:e1800484. [PMID: 30009550 DOI: 10.1002/adhm.201800484] [Citation(s) in RCA: 86] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 06/20/2018] [Indexed: 12/21/2022]
Abstract
Extracellular vesicles (EVs) are emerging as one of the many new and promising biomarkers for liquid biopsy of cancer due to their loading capability of some specific proteins and nucleic acids that are closely associated with cancer states. As such, the isolation and detection of cancer-derived EVs offer important information in noninvasive diagnosis of early-stage cancer and real-time monitoring of cancer development. In light of the importance of EVs, over the last decade, researchers have made remarkable innovations to advance the development of EV isolation and detection methods by taking advantage of microfluidics, biomolecule probes, nanomaterials, surface plasmon, optics, and so on. This review introduces the basic properties of EVs and common cancer-derived EV ingredients, and provides a comprehensive overview of EV isolation and detection strategies, with emphasis on liquid biopsies of EVs for cancer diagnostics.
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Affiliation(s)
- Wenshuo Wang
- CAS Key Laboratory of Bio-Inspired Materials and Interfacial Science; Technical Institute of Physics and Chemistry; Chinese Academy of Sciences; Beijing 100190 P. R. China
- University of Chinese Academy of Sciences; Beijing 100049 P. R. China
| | - Jing Luo
- CAS Key Laboratory of Bio-Inspired Materials and Interfacial Science; Technical Institute of Physics and Chemistry; Chinese Academy of Sciences; Beijing 100190 P. R. China
- University of Chinese Academy of Sciences; Beijing 100049 P. R. China
| | - Shutao Wang
- CAS Key Laboratory of Bio-Inspired Materials and Interfacial Science; Technical Institute of Physics and Chemistry; Chinese Academy of Sciences; Beijing 100190 P. R. China
- University of Chinese Academy of Sciences; Beijing 100049 P. R. China
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190
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Gong Y, Fan N, Yang X, Peng B, Jiang H. New advances in microfluidic flow cytometry. Electrophoresis 2018; 40:1212-1229. [PMID: 30242856 DOI: 10.1002/elps.201800298] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2018] [Revised: 09/07/2018] [Accepted: 09/15/2018] [Indexed: 01/22/2023]
Abstract
In recent years, researchers are paying the increasing attention to the development of portable microfluidic diagnostic devices including microfluidic flow cytometry for the point-of-care testing. Microfluidic flow cytometry, where microfluidics and flow cytometry work together to realize novel functionalities on the microchip, provides a powerful tool for measuring the multiple characteristics of biological samples. The development of a portable, low-cost, and compact flow cytometer can benefit the health care in underserved areas such as Africa or Asia. In this article, we review recent advancements of microfluidics including sample pumping, focusing and sorting, novel detection approaches, and data analysis in the field of flow cytometry. The challenge of microfluidic flow cytometry is also examined briefly.
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Affiliation(s)
- Yanli Gong
- School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu, P. R. China
| | - Na Fan
- School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu, P. R. China
| | - Xu Yang
- School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu, P. R. China
| | - Bei Peng
- School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu, P. R. China
| | - Hai Jiang
- School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu, P. R. China
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191
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Kwon T, Yao R, Hamel JFP, Han J. Continuous removal of small nonviable suspended mammalian cells and debris from bioreactors using inertial microfluidics. LAB ON A CHIP 2018; 18:2826-2837. [PMID: 30079919 DOI: 10.1039/c8lc00250a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Removing nonviable cells from a cell suspension is crucial in biotechnology and biomanufacturing. Label-free microfluidic cell separation devices based on dielectrophoresis, acoustophoresis, and deterministic lateral displacement are used to remove nonviable cells. However, their volumetric throughputs and test cell concentrations are generally too low to be useful in typical bioreactors in biomanufacturing. In this study, we demonstrate the efficient removal of small (<10 μm) nonviable cells from bioreactors while maintaining viable cells using inertial microfluidic cell sorting devices and characterize their performance. Despite the size overlap between viable and nonviable cell populations, the devices demonstrated 3.5-28.0% dead cell removal efficiency with 88.3-83.6% removal purity as well as 97.8-99.8% live cell retention efficiency at 4 million cells per mL with 80% viability. Cascaded and parallel configurations increased the cell concentration capacity (10 million cells per mL) and volumetric throughput (6-8 mL min-1). The system can be used for the removal of small nonviable cells from a cell suspension during continuous perfusion cell culture operations.
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Affiliation(s)
- Taehong Kwon
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, USA.
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192
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Abstract
Inertial Microfluidics offer a high throughput, label-free, easy to design, and cost-effective solutions, and are a promising technique based on hydrodynamic forces (passive techniques) instead of external ones, which can be employed in the lab-on-a-chip and micro-total-analysis-systems for the focusing, manipulation, and separation of microparticles in chemical and biomedical applications. The current study focuses on the focusing behavior of the microparticles in an asymmetric curvilinear microchannel with curvature angle of 280°. For this purpose, the focusing behavior of the microparticles with three different diameters, representing cells with different sizes in the microchannel, was experimentally studied at flow rates from 400 to 2700 µL/min. In this regard, the width and position of the focusing band are carefully recorded for all of the particles in all of the flow rates. Moreover, the distance between the binary combinations of the microparticles is reported for each flow rate, along with the Reynolds number corresponding to the largest distances. Furthermore, the results of this study are compared with those of the microchannel with the same curvature angle but having a symmetric geometry. The microchannel proposed in this study can be used or further modified for cell separation applications.
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193
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Abstract
Inertial microfluidics is a widely used technology which enables label-free manipulation of particles in microchannels. However, this technology has been limited to bioparticles larger than RBCs, due to the strong correlation between the inertial lift forces and the particle size. This paper presents a method to extend the capabilities of inertial microfluidics to smaller bioparticles, of which a plethora of clinically relevant types exist in the human body. Therefore, this method can be integrated with microfluidic devices for inertial manipulation of bioparticles that have defied all prior attempts, enabling a variety of applications in clinical diagnosis including cytometry of micron-scale bioparticles, isolation and characterization of pathogens and extracellular microvesicles, or phenotyping of cancer or stem cells at physiological shear stresses. Inertial microfluidics (i.e., migration and focusing of particles in finite Reynolds number microchannel flows) is a passive, precise, and high-throughput method for microparticle manipulation and sorting. Therefore, it has been utilized in numerous biomedical applications including phenotypic cell screening, blood fractionation, and rare-cell isolation. Nonetheless, the applications of this technology have been limited to larger bioparticles such as blood cells, circulating tumor cells, and stem cells, because smaller particles require drastically longer channels for inertial focusing, which increases the pressure requirement and the footprint of the device to the extent that the system becomes unfeasible. Inertial manipulation of smaller bioparticles such as fungi, bacteria, viruses, and other pathogens or blood components such as platelets and exosomes is of significant interest. Here, we show that using oscillatory microfluidics, inertial focusing in practically “infinite channels” can be achieved, allowing for focusing of micron-scale (i.e. hundreds of nanometers) particles. This method enables manipulation of particles at extremely low particle Reynolds number (Rep < 0.005) flows that are otherwise unattainable by steady-flow inertial microfluidics (which has been limited to Rep > ∼10−1). Using this technique, we demonstrated that synthetic particles as small as 500 nm and a submicron bacterium, Staphylococcus aureus, can be inertially focused. Furthermore, we characterized the physics of inertial microfluidics in this newly enabled particle size and Rep range using a Peclet-like dimensionless number (α). We experimentally observed that α >> 1 is required to overcome diffusion and be able to inertially manipulate particles.
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194
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Holloway PM, Butement J, Hegde M, West J. Serial integration of Dean-structured sample cores with linear inertial focussing for enhanced particle and cell sorting. BIOMICROFLUIDICS 2018; 12:044104. [PMID: 30034567 PMCID: PMC6037536 DOI: 10.1063/1.5038965] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 06/24/2018] [Indexed: 06/02/2023]
Abstract
In this contribution, a channel aspect ratio of >2 was used to access high velocity regimes to provide confined sample cores by Dean focussing in advance of linear inertial focussing. This produces a singular separation origin with a mirrored transport path for efficient particle and blood cell sorting, while also increasing the spatial resolution for multiscale sorting.
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Affiliation(s)
- Paul M. Holloway
- Centre for Hybrid Biodevices and Cancer Sciences, Faculty of Medicine, University of Southampton, Southampton SO17 1BJ, United Kingdom
| | - Jonathan Butement
- Centre for Hybrid Biodevices and Cancer Sciences, Faculty of Medicine, University of Southampton, Southampton SO17 1BJ, United Kingdom
| | | | - Jonathan West
- Centre for Hybrid Biodevices and Cancer Sciences, Faculty of Medicine, University of Southampton, Southampton SO17 1BJ, United Kingdom
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195
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Chen Q, Li D, Malekanfard A, Cao Q, Lin J, Wang M, Han X, Xuan X. Tunable, Sheathless Focusing of Diamagnetic Particles in Ferrofluid Microflows with a Single Set of Overhead Permanent Magnets. Anal Chem 2018; 90:8600-8606. [DOI: 10.1021/acs.analchem.8b01813] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Qi Chen
- Department of Mechanical Engineering, Clemson University, Clemson, South Carolina 29634-0921, United States
- MOA Key Laboratory of Agricultural Information Acquisition Technology (Beijing), China Agricultural University, Beijing 10083, China
| | - Di Li
- Department of Mechanical Engineering, Clemson University, Clemson, South Carolina 29634-0921, United States
| | - Amirreza Malekanfard
- Department of Mechanical Engineering, Clemson University, Clemson, South Carolina 29634-0921, United States
| | - Quanliang Cao
- Wuhan National High Magnetic Field Center and State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Jianhan Lin
- MOA Key Laboratory of Agricultural Information Acquisition Technology (Beijing), China Agricultural University, Beijing 10083, China
| | - Maohua Wang
- MOA Key Laboratory of Agricultural Information Acquisition Technology (Beijing), China Agricultural University, Beijing 10083, China
| | - Xiaotao Han
- Wuhan National High Magnetic Field Center and State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Xiangchun Xuan
- Department of Mechanical Engineering, Clemson University, Clemson, South Carolina 29634-0921, United States
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196
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Isolation of cells from whole blood using shear-induced diffusion. Sci Rep 2018; 8:9411. [PMID: 29925931 PMCID: PMC6010421 DOI: 10.1038/s41598-018-27779-2] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Accepted: 06/08/2018] [Indexed: 01/31/2023] Open
Abstract
Extraction of cells of interest directly from whole blood is in high demand, yet extraordinary challenging due to the complex hemodynamics and hemorheology of the sample. Herein, we describe a new microfluidic platform that exploits the intrinsic complex properties of blood for continuous size-selective focusing and separation of cells directly from unprocessed whole blood. The novel system only requires routinely accessible saline solution to form a sandwiched fluid configuration and to initiate a strong effect of shear-induced diffusion of cells, which is coupled with fluid inertia for effective separation. Separations of beads and cells from whole blood have been successfully demonstrated with high efficiency (89.8%) at throughput of 6.75 mL/hr (106–107 cells/s) of whole blood. Rapid isolation of circulating tumor cells (CTCs) from peripheral blood sample of hepatocarcinoma patients is also shown as a proof of principle.
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197
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198
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Gou Y, Jia Y, Wang P, Sun C. Progress of Inertial Microfluidics in Principle and Application. SENSORS (BASEL, SWITZERLAND) 2018; 18:E1762. [PMID: 29857563 PMCID: PMC6021949 DOI: 10.3390/s18061762] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 05/14/2018] [Accepted: 05/22/2018] [Indexed: 01/10/2023]
Abstract
Inertial microfluidics has become a popular topic in microfluidics research for its good performance in particle manipulation and its advantages of simple structure, high throughput, and freedom from an external field. Compared with traditional microfluidic devices, the flow field in inertial microfluidics is between Stokes state and turbulence, whereas the flow is still regarded as laminar. However, many mechanical effects induced by the inertial effect are difficult to observe in traditional microfluidics, making particle motion analysis in inertial microfluidics more complicated. In recent years, the inertial migration effect in straight and curved channels has been explored theoretically and experimentally to realize on-chip manipulation with extensive applications from the ordinary manipulation of particles to biochemical analysis. In this review, the latest theoretical achievements and force analyses of inertial microfluidics and its development process are introduced, and its applications in circulating tumor cells, exosomes, DNA, and other biological particles are summarized. Finally, the future development of inertial microfluidics is discussed. Owing to its special advantages in particle manipulation, inertial microfluidics will play a more important role in integrated biochips and biomolecule analysis.
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Affiliation(s)
- Yixing Gou
- State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China.
| | - Yixuan Jia
- Department of Biomedical Engineering, Tsinghua University, Beijing 100084, China.
| | - Peng Wang
- State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China.
| | - Changku Sun
- State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China.
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199
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Jung BJ, Kim J, Kim JA, Jang H, Seo S, Lee W. PDMS-Parylene Hybrid, Flexible Microfluidics for Real-Time Modulation of 3D Helical Inertial Microfluidics. MICROMACHINES 2018; 9:E255. [PMID: 30424188 PMCID: PMC6187561 DOI: 10.3390/mi9060255] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 05/17/2018] [Accepted: 05/18/2018] [Indexed: 11/25/2022]
Abstract
Inertial microfluidics has drawn much attention for its applications for circulating tumor cell separations from blood. The fluid flows and the inertial particle focusing in inertial microfluidic systems are highly dependent on the channel geometry and structure. Flexible microfluidic systems can have adjustable 3D channel geometries by curving planar 2D channels into 3D structures, which will enable tunable inertial separation. We present a poly(dimethylsiloxane) (PDMS)-parylene hybrid thin-film microfluidic system that can provide high flexibility for 3D channel shaping while maintaining the channel cross-sectional shape. The PDMS-parylene hybrid microfluidic channels were fabricated by a molding and bonding technique using initiated chemical vapor deposition (iCVD) bonding. We constructed 3D helical inertial microfluidic channels by coiling a straight 2D channel and studied the inertial focusing while varying radius of curvature and Reynolds number. This thin film structure allows for high channel curvature and high Dean numbers which leads to faster inertial particle focusing and shorter channel lengths than 2D spiral channels. Most importantly, the focusing positions of particles and cells in the microchannel can be tuned in real time by simply modulating the channel curvature. The simple mechanical modulation of these 3D structure microfluidic systems is expected to provide unique advantages of convenient tuning of cell separation thresholds with a single device.
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Affiliation(s)
- Bum-Joon Jung
- Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea.
| | - Jihye Kim
- Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea.
| | - Jeong-Ah Kim
- Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea.
| | - Hansol Jang
- Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea.
| | - Sumin Seo
- Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea.
| | - Wonhee Lee
- Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea.
- Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea.
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200
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Hadikhani P, Hashemi SMH, Balestra G, Zhu L, Modestino MA, Gallaire F, Psaltis D. Inertial manipulation of bubbles in rectangular microfluidic channels. LAB ON A CHIP 2018; 18:1035-1046. [PMID: 29512658 DOI: 10.1039/c7lc01283g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Inertial microfluidics is an active field of research that deals with crossflow positioning of the suspended entities in microflows. Until now, the majority of the studies have focused on the behavior of rigid particles in order to provide guidelines for microfluidic applications such as sorting and filtering. Deformable entities such as bubbles and droplets are considered in fewer studies despite their importance in multiphase microflows. In this paper, we show that the trajectory of bubbles flowing in rectangular and square microchannels can be controlled by tuning the balance of forces acting on them. A T-junction geometry is employed to introduce bubbles into a microchannel and analyze their lateral equilibrium position in a range of Reynolds (1 < Re < 40) and capillary numbers (0.1 < Ca < 1). We find that the Reynolds number (Re), the capillary number (Ca), the diameter of the bubble (D[combining macron]), and the aspect ratio of the channel are the influential parameters in this phenomenon. For instance, at high Re, the flow pushes the bubble towards the wall while large Ca or D[combining macron] moves the bubble towards the center. Moreover, in the shallow channels, having aspect ratios higher than one, the bubble moves towards the narrower sidewalls. One important outcome of this study is that the equilibrium position of bubbles in rectangular channels is different from that of solid particles. The experimental observations are in good agreement with the performed numerical simulations and provide insights into the dynamics of bubbles in laminar flows which can be utilized in the design of flow based multiphase flow reactors.
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Affiliation(s)
- Pooria Hadikhani
- Optics Laboratory, School of Engineering, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015, Lausanne, Switzerland.
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