1
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Ma H, Ramanujam AA, Linnes JC, Kinzer-Ursem TL. Biomolecular Interaction Analysis Quantification with a Low-Volume Microfluidic Chip and Particle Diffusometry. Anal Chem 2024; 96:5815-5823. [PMID: 38575144 PMCID: PMC11025547 DOI: 10.1021/acs.analchem.3c04840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 02/01/2024] [Accepted: 02/02/2024] [Indexed: 04/06/2024]
Abstract
Microfluidic techniques are widely applied in biomolecular analysis and disease diagnostic assays. While the volume of the sample that is directly used in such assays is often only femto-to microliters, the "dead volume" of solutions supplied in syringes and tubing can be much larger, even up to milliliters, increasing overall reagent use and making analysis significantly more expensive. To reduce the difficulty and cost, we designed a new chip using a low volume solution for analysis and applied it to obtain real-time data for protein-protein interaction measurements. The chip takes advantage of air/aqueous two-phase droplet flow, on-chip rapid mixing within milliseconds, and a droplet capture method, that ultimately requires only 2 μL of reagent solution. The interaction is analyzed by particle diffusometry, a nonintrusive and precise optical detection method to analyze the properties of microparticle diffusion in solution. Herein, we demonstrate on-chip characterization of human immunodeficiency virus p24 antibody-antigen protein binding kinetics imaged via fluorescence microscopy and analyzed by PD. The measured kon and koff are 1 × 106 M-1 s-1 and 3.3 × 10-4 s-1, respectively, and agree with independent measurement via biolayer interferometry and previously calculated p24-antibody binding kinetics. This new microfluidic chip and the protein-protein interaction analysis method can also be applied in other fields that require low-volume solutions to perform accurate measurement, analysis, and detection.
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Affiliation(s)
- Hui Ma
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Aiswarya A. Ramanujam
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Jacqueline C. Linnes
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Tamara L. Kinzer-Ursem
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
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2
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Wong YC, Yang S, Wen W. Prednisolone Nanoprecipitation with Dean Instability Microfluidics Mixer. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:652. [PMID: 38668146 PMCID: PMC11054107 DOI: 10.3390/nano14080652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2024] [Revised: 04/05/2024] [Accepted: 04/08/2024] [Indexed: 04/29/2024]
Abstract
Dean flow and Dean instability play an important role in inertial microfluidics, with a wide application in mixing and sorting. However, most studies are limited to Dean flow in the microscale. This work first reports the application of Dean instability on organic nanoparticles synthesis at De up to 198. The channel geometry (the tortuous channel) is optimized by simulation, in which the mixing efficiency is considered. With the optimized design, prednisolone nanoparticles are synthesized, and the size of the most abundant prednisolone nanoparticles is down to 100 nm with an increase in the Re and De and smallest size down to 46 nm. This work serves as an ice-breaker to the real application of Dean instability by demonstrating its ability in mixing and nanomaterials like nanoparticle synthesis.
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Affiliation(s)
- Yu Ching Wong
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong 999077, China; (Y.C.W.); (S.Y.)
| | - Siyu Yang
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong 999077, China; (Y.C.W.); (S.Y.)
| | - Weijia Wen
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong 999077, China; (Y.C.W.); (S.Y.)
- Thrust of Advanced Materials, The Hong Kong University of Science and Technology (Guangzhou), Guangzhou 510630, China
- HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute, Futian, Shenzhen 518000, China
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3
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Saffar Y, Kashanj S, Nobes DS, Sabbagh R. The Physics and Manipulation of Dean Vortices in Single- and Two-Phase Flow in Curved Microchannels: A Review. MICROMACHINES 2023; 14:2202. [PMID: 38138371 PMCID: PMC10745399 DOI: 10.3390/mi14122202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2023] [Revised: 11/28/2023] [Accepted: 11/30/2023] [Indexed: 12/24/2023]
Abstract
Microchannels with curved geometries have been employed for many applications in microfluidic devices in the past decades. The Dean vortices generated in such geometries have been manipulated using different methods to enhance the performance of devices in applications such as mixing, droplet sorting, and particle/cell separation. Understanding the effect of the manipulation method on the Dean vortices in different geometries can provide crucial information to be employed in designing high-efficiency microfluidic devices. In this review, the physics of Dean vortices and the affecting parameters are summarized. Various Dean number calculation methods are collected and represented to minimize the misinterpretation of published information due to the lack of a unified defining formula for the Dean dimensionless number. Consequently, all Dean number values reported in the references are recalculated to the most common method to facilitate comprehension of the phenomena. Based on the converted information gathered from previous numerical and experimental studies, it is concluded that the length of the channel and the channel pathline, e.g., spiral, serpentine, or helix, also affect the flow state. This review also provides a detailed summery on the effect of other geometric parameters, such as cross-section shape, aspect ratio, and radius of curvature, on the Dean vortices' number and arrangement. Finally, considering the importance of droplet microfluidics, the effect of curved geometry on the shape, trajectory, and internal flow organization of the droplets passing through a curved channel has been reviewed.
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Affiliation(s)
| | | | | | - Reza Sabbagh
- Mechanical Engineering Department, University of Alberta, Edmonton, AB T6G 2R3, Canada; (Y.S.); (S.K.); (D.S.N.)
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4
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Wong YC, Dai C, Xian Q, Yan Z, Zhang Z, Wen W. Flow study of Dean's instability in high aspect ratio microchannels. Sci Rep 2023; 13:17896. [PMID: 37857780 PMCID: PMC10587195 DOI: 10.1038/s41598-023-44969-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Accepted: 10/13/2023] [Indexed: 10/21/2023] Open
Abstract
Dean's flow and Dean's instability have always been important concepts in the inertial microfluidics. Curved channels are widely used for applications like mixing and sorting but are limited to Dean's flow only. This work first reports the Dean's instability flow in high aspect ratio channels on the deka-microns level for [Formula: see text]. A new channel geometry (the tortuous channel), which creates a rolled-up velocity profile, is presented and studied experimentally and numerically along with other three typical channel geometries at Dean's flow condition and Dean's instability condition. The tortuous channel generates a higher De environment at the same Re compared to the other channels and allows easier Dean's instability creation. We further demonstrate the use of multiple vortexes for mixing. The mixing efficiency is considered among different channel patterns and the tortuous channel outperforms the others. This work offers more understanding of the creation of Dean's instability at high aspect ratio channels and the effect of channel geometry on it. Ultimately, it demonstrates the potential for applications like mixing and cell sorting.
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Affiliation(s)
- Yu Ching Wong
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong
| | - Cheng Dai
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong
| | - Qingyue Xian
- Division of Emerging Interdisciplinary Areas, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong
| | - Zhaoxu Yan
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong
| | - Ziyi Zhang
- Division of Emerging Interdisciplinary Areas, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong
| | - Weijia Wen
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong.
- Thrust of Advanced Materials, The Hong Kong University of Science and Technology (Guangzhou), Guangzhou, China.
- HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute, Futian, Shenzhen, China.
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5
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Agha A, Waheed W, Stiharu I, Nerguizian V, Destgeer G, Abu-Nada E, Alazzam A. A review on microfluidic-assisted nanoparticle synthesis, and their applications using multiscale simulation methods. NANOSCALE RESEARCH LETTERS 2023; 18:18. [PMID: 36800044 PMCID: PMC9936499 DOI: 10.1186/s11671-023-03792-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Accepted: 02/07/2023] [Indexed: 05/24/2023]
Abstract
Recent years have witnessed an increased interest in the development of nanoparticles (NPs) owing to their potential use in a wide variety of biomedical applications, including drug delivery, imaging agents, gene therapy, and vaccines, where recently, lipid nanoparticle mRNA-based vaccines were developed to prevent SARS-CoV-2 causing COVID-19. NPs typically fall into two broad categories: organic and inorganic. Organic NPs mainly include lipid-based and polymer-based nanoparticles, such as liposomes, solid lipid nanoparticles, polymersomes, dendrimers, and polymer micelles. Gold and silver NPs, iron oxide NPs, quantum dots, and carbon and silica-based nanomaterials make up the bulk of the inorganic NPs. These NPs are prepared using a variety of top-down and bottom-up approaches. Microfluidics provide an attractive synthesis alternative and is advantageous compared to the conventional bulk methods. The microfluidic mixing-based production methods offer better control in achieving the desired size, morphology, shape, size distribution, and surface properties of the synthesized NPs. The technology also exhibits excellent process repeatability, fast handling, less sample usage, and yields greater encapsulation efficiencies. In this article, we provide a comprehensive review of the microfluidic-based passive and active mixing techniques for NP synthesis, and their latest developments. Additionally, a summary of microfluidic devices used for NP production is presented. Nonetheless, despite significant advancements in the experimental procedures, complete details of a nanoparticle-based system cannot be deduced from the experiments alone, and thus, multiscale computer simulations are utilized to perform systematic investigations. The work also details the most common multiscale simulation methods and their advancements in unveiling critical mechanisms involved in nanoparticle synthesis and the interaction of nanoparticles with other entities, especially in biomedical and therapeutic systems. Finally, an analysis is provided on the challenges in microfluidics related to nanoparticle synthesis and applications, and the future perspectives, such as large-scale NP synthesis, and hybrid formulations and devices.
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Affiliation(s)
- Abdulrahman Agha
- Department of Mechanical Engineering, Khalifa University, Abu Dhabi, UAE
| | - Waqas Waheed
- Department of Mechanical Engineering, Khalifa University, Abu Dhabi, UAE
- System on Chip Center, Khalifa University, Abu Dhabi, UAE
| | | | | | - Ghulam Destgeer
- Department of Electrical Engineering, School of Computation, Information and Technology, Technical University of Munich, Munich, Germany
| | - Eiyad Abu-Nada
- Department of Mechanical Engineering, Khalifa University, Abu Dhabi, UAE
| | - Anas Alazzam
- Department of Mechanical Engineering, Khalifa University, Abu Dhabi, UAE.
- System on Chip Center, Khalifa University, Abu Dhabi, UAE.
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6
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Pryazhnikov MI, Yakimov AS, Denisov IA, Pryazhnikov AI, Minakov AV, Belobrov PI. Fluid Viscosity Measurement by Means of Secondary Flow in a Curved Channel. MICROMACHINES 2022; 13:1452. [PMID: 36144075 PMCID: PMC9502554 DOI: 10.3390/mi13091452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 08/25/2022] [Accepted: 08/25/2022] [Indexed: 06/16/2023]
Abstract
This article presents a new approach to determining the viscosity of Newtonian fluid. The approach is based on the analysis of the secondary Dean flow in a curved channel. The study of the flow patterns of water and aqueous solutions of glycerin in a microfluidic chip with a U-microchannel was carried out. The advantages of a microfluidic viscometer based on a secondary Dean flow are its simplicity, quickness, and high accuracy in determining the viscosity coefficient of a liquid. A viscosity image in a short movie represents fluid properties. It is revealed that the viscosity coefficient can be determined by the dependence of the recirculation angle of the secondary Dean flow. The article provides a correlation between the Dean number and the flow recirculation angle. The results of the field experiment, presented in the article, correlate with the data obtained using computational fluid dynamics and allow for selecting parameters to create microfluidic viscometers with a U-shaped microchannel.
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Affiliation(s)
- Maxim I. Pryazhnikov
- Laboratory of Physical and Chemical Technologies for the Development of Hard-to-Recover Hydrocarbon Reserves, Siberian Federal University, 660041 Krasnoyarsk, Russia
- Laboratory of Heat Exchange Control in Phase and Chemical Transformations, Kutateladze Institute of Thermophysics, 630090 Novosibirsk, Russia
| | - Anton S. Yakimov
- Laboratory of Physical and Chemical Technologies for the Development of Hard-to-Recover Hydrocarbon Reserves, Siberian Federal University, 660041 Krasnoyarsk, Russia
| | - Ivan A. Denisov
- Laboratory of Physical and Chemical Technologies for the Development of Hard-to-Recover Hydrocarbon Reserves, Siberian Federal University, 660041 Krasnoyarsk, Russia
| | - Andrey I. Pryazhnikov
- Laboratory of Physical and Chemical Technologies for the Development of Hard-to-Recover Hydrocarbon Reserves, Siberian Federal University, 660041 Krasnoyarsk, Russia
| | - Andrey V. Minakov
- Laboratory of Physical and Chemical Technologies for the Development of Hard-to-Recover Hydrocarbon Reserves, Siberian Federal University, 660041 Krasnoyarsk, Russia
- Laboratory of Heat Exchange Control in Phase and Chemical Transformations, Kutateladze Institute of Thermophysics, 630090 Novosibirsk, Russia
| | - Peter I. Belobrov
- Department of Biophysics, Siberian Federal University, 660041 Krasnoyarsk, Russia
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7
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Ripoll M, Martin E, Enot M, Robbe O, Rapisarda C, Nicolai MC, Deliot A, Tabeling P, Authelin JR, Nakach M, Wils P. Optimal self-assembly of lipid nanoparticles (LNP) in a ring micromixer. Sci Rep 2022; 12:9483. [PMID: 35676394 PMCID: PMC9177731 DOI: 10.1038/s41598-022-13112-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 05/20/2022] [Indexed: 11/24/2022] Open
Abstract
Lipid nanoparticles (LNPs) for RNA and DNA delivery have attracted considerable attention for their ability to treat a broad range of diseases and to vectorize mRNA for COVID vaccines. LNPs are produced by mixing biomolecules and lipids, which self-assemble to form the desired structure. In this domain, microfluidics shows clear advantages: high mixing quality, low-stress conditions, and fast preparation. Studies of LNPs produced in micromixers have revealed, in certain ranges of flow rates, a degradation in performance in terms of size, monodispersity and encapsulation efficiency. In this study, we focus on the ring micromixer, which is well adapted to high throughput. We reveal three regimes, side-by-side, transitional and highly mixed, that control the mixing performance of the device. Furthermore, using cryo-TEM and biochemical analysis, we show that the mixing performances are strongly correlated to the characteristics of the LNPs we produce. We emphasize the importance of the flow-rate ratio and propose a physical criterion based on the onset of temporal instabilities for producing LNPs with optimal characteristics in terms of geometry, monodispersity and encapsulation yield. These criteria are generally applicable.
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Affiliation(s)
- Manon Ripoll
- BioDPD Department, SANOFI, 13 Quai Jules Guesde, 94400, Vitry-sur-Seine, France
| | - Elian Martin
- Microfluidics, MEMS, Nanostructures Laboratory, CNRS Chimie Biologie Innovation (CBI), UMR 8231, Institut Pierre Gilles de Gennes (IPGG), ESPCI Paris, PSL Research University, 6 rue Jean Calvin, 75005, Paris, France
| | - Mathilde Enot
- BioDPD Department, SANOFI, 13 Quai Jules Guesde, 94400, Vitry-sur-Seine, France
| | - Oscar Robbe
- BioDPD Department, SANOFI, 13 Quai Jules Guesde, 94400, Vitry-sur-Seine, France
| | - Chiara Rapisarda
- BioDPD Department, SANOFI, 13 Quai Jules Guesde, 94400, Vitry-sur-Seine, France
| | - Marie-Claire Nicolai
- REI Department, SANOFI Pasteur, 1541 Av. Marcel Mérieux, 69280, Marcy-L'Étoile, France
| | - Aurélie Deliot
- REI Department, SANOFI Pasteur, 1541 Av. Marcel Mérieux, 69280, Marcy-L'Étoile, France
| | - Patrick Tabeling
- Microfluidics, MEMS, Nanostructures Laboratory, CNRS Chimie Biologie Innovation (CBI), UMR 8231, Institut Pierre Gilles de Gennes (IPGG), ESPCI Paris, PSL Research University, 6 rue Jean Calvin, 75005, Paris, France.
| | - Jean-René Authelin
- BioDPD Department, SANOFI, 13 Quai Jules Guesde, 94400, Vitry-sur-Seine, France
| | - Mostafa Nakach
- BioDPD Department, SANOFI, 13 Quai Jules Guesde, 94400, Vitry-sur-Seine, France
| | - Pierre Wils
- BioDPD Department, SANOFI, 13 Quai Jules Guesde, 94400, Vitry-sur-Seine, France
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8
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Beaton AD, Schaap AM, Pascal R, Hanz R, Martincic U, Cardwell CL, Morris A, Clinton-Bailey G, Saw K, Hartman SE, Mowlem MC. Lab-on-Chip for In Situ Analysis of Nutrients in the Deep Sea. ACS Sens 2022; 7:89-98. [PMID: 35020365 DOI: 10.1021/acssensors.1c01685] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Microfluidic reagent-based nutrient sensors offer a promising technology to address the global undersampling of ocean chemistry but have so far not been shown to operate in the deep sea (>200 m). We report a new family of miniaturized lab-on-chip (LOC) colorimetric analyzers making in situ nitrate and phosphate measurements from the surface ocean to the deep sea (>4800 m). This new technology gives users a new low-cost, high-performance tool for measuring chemistry in hyperbaric environments. Using a combination of laboratory verification and field-based tests, we demonstrate that the analyzers are capable of in situ measurements during profiling that are comparable to laboratory-based analyses. The sensors feature a novel and efficient inertial-flow mixer that increases the mixing efficiency and reduces the back pressure and flushing time compared to a previously used serpentine mixing channel. Four separate replicate units of the nitrate and phosphate sensor were calibrated in the laboratory and showed an average limit of detection of 0.03 μM for nitrate and 0.016 μM for phosphate. Three on-chip optical absorption cell lengths provide a large linear range (to >750 μM (10.5 mg/L-N) for nitrate and >15 μM (0.47 mg/L-P) for phosphate), making the instruments suitable for typical concentrations in both ocean and freshwater aquatic environments. The LOC systems automatically collected a series of deep-sea nitrate and phosphate profiles in the northeast Atlantic while attached to a conductivity temperature depth (CTD) rosette, and the LOC nitrate sensor was attached to a PROVOR profiling float to conduct automated nitrate profiles in the Mediterranean Sea.
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Affiliation(s)
- Alexander D. Beaton
- National Oceanography Centre, European Way, Southampton SO14 3ZH, United Kingdom
| | - Allison M. Schaap
- National Oceanography Centre, European Way, Southampton SO14 3ZH, United Kingdom
| | - Robin Pascal
- National Oceanography Centre, European Way, Southampton SO14 3ZH, United Kingdom
| | - Rudolf Hanz
- National Oceanography Centre, European Way, Southampton SO14 3ZH, United Kingdom
| | - Urska Martincic
- National Oceanography Centre, European Way, Southampton SO14 3ZH, United Kingdom
| | | | - Andrew Morris
- National Oceanography Centre, European Way, Southampton SO14 3ZH, United Kingdom
| | | | - Kevin Saw
- National Oceanography Centre, European Way, Southampton SO14 3ZH, United Kingdom
| | - Susan E. Hartman
- National Oceanography Centre, European Way, Southampton SO14 3ZH, United Kingdom
| | - Matthew C. Mowlem
- National Oceanography Centre, European Way, Southampton SO14 3ZH, United Kingdom
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9
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Rouhi O, Razavi Bazaz S, Niazmand H, Mirakhorli F, Mas-hafi S, A. Amiri H, Miansari M, Ebrahimi Warkiani M. Numerical and Experimental Study of Cross-Sectional Effects on the Mixing Performance of the Spiral Microfluidics. MICROMACHINES 2021; 12:1470. [PMID: 34945321 PMCID: PMC8705925 DOI: 10.3390/mi12121470] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 11/21/2021] [Accepted: 11/23/2021] [Indexed: 12/11/2022]
Abstract
Mixing at the microscale is of great importance for various applications ranging from biological and chemical synthesis to drug delivery. Among the numerous types of micromixers that have been developed, planar passive spiral micromixers have gained considerable interest due to their ease of fabrication and integration into complex miniaturized systems. However, less attention has been paid to non-planar spiral micromixers with various cross-sections and the effects of these cross-sections on the total performance of the micromixer. Here, mixing performance in a spiral micromixer with different channel cross-sections is evaluated experimentally and numerically in the Re range of 0.001 to 50. The accuracy of the 3D-finite element model was first verified at different flow rates by tracking the mixing index across the loops, which were directly proportional to the spiral radius and were hence also proportional to the Dean flow. It is shown that higher flow rates induce stronger vortices compared to lower flow rates; thus, fewer loops are required for efficient mixing. The numerical study revealed that a large-angle outward trapezoidal cross-section provides the highest mixing performance, reaching efficiencies of up to 95%. Moreover, the velocity/vorticity along the channel length was analyzed and discussed to evaluate channel mixing performance. A relatively low pressure drop (<130 kPa) makes these passive spiral micromixers ideal candidates for various lab-on-chip applications.
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Affiliation(s)
- Omid Rouhi
- School of Biomedical Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia; (O.R.); (S.R.B.); (F.M.)
- Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad 91779-48974, Iran;
| | - Sajad Razavi Bazaz
- School of Biomedical Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia; (O.R.); (S.R.B.); (F.M.)
| | - Hamid Niazmand
- Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad 91779-48974, Iran;
| | - Fateme Mirakhorli
- School of Biomedical Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia; (O.R.); (S.R.B.); (F.M.)
| | - Sima Mas-hafi
- Micro+Nanosystems & Applied Biophysics Laboratory, Department of Mechanical Engineering, Babol Noshirvani University of Technology, P.O. Box 484, Babol 47148-71167, Iran; (S.M.-h.); (H.A.A.); (M.M.)
- Department of Cancer Medicine, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Isar 11, Babol 47138-18983, Iran
| | - Hoseyn A. Amiri
- Micro+Nanosystems & Applied Biophysics Laboratory, Department of Mechanical Engineering, Babol Noshirvani University of Technology, P.O. Box 484, Babol 47148-71167, Iran; (S.M.-h.); (H.A.A.); (M.M.)
- Department of Cancer Medicine, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Isar 11, Babol 47138-18983, Iran
| | - Morteza Miansari
- Micro+Nanosystems & Applied Biophysics Laboratory, Department of Mechanical Engineering, Babol Noshirvani University of Technology, P.O. Box 484, Babol 47148-71167, Iran; (S.M.-h.); (H.A.A.); (M.M.)
- Department of Cancer Medicine, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Isar 11, Babol 47138-18983, Iran
| | - Majid Ebrahimi Warkiani
- School of Biomedical Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia; (O.R.); (S.R.B.); (F.M.)
- Institute of Molecular Medicine, Sechenov University, 119991 Moscow, Russia
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10
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Synthesis and Biodistribution of 99mTc-Labeled PLGA Nanoparticles by Microfluidic Technique. Pharmaceutics 2021; 13:pharmaceutics13111769. [PMID: 34834184 PMCID: PMC8621482 DOI: 10.3390/pharmaceutics13111769] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 10/14/2021] [Accepted: 10/18/2021] [Indexed: 11/17/2022] Open
Abstract
The aim of present study was to develop radiolabeled NPs to overcome the limitations of fluorescence with theranostic potential. Synthesis of PLGA-NPs loaded with technetium-99m was based on a Dean-Vortex-Bifurcation Mixer (DVBM) using an innovative microfluidic technique with high batch-to-batch reproducibility and tailored-made size of NPs. Eighteen different formulations were tested and characterized for particle size, zeta potential, polydispersity index, labeling efficiency, and in vitro stability. Overall, physical characterization by dynamic light scattering (DLS) showed an increase in particle size after radiolabeling probably due to the incorporation of the isotope into the PLGA-NPs shell. NPs of 60 nm (obtained by 5:1 PVA:PLGA ratio and 15 mL/min TFR with 99mTc included in PVA) had high labeling efficiency (94.20 ± 5.83%) and >80% stability after 24 h and showed optimal biodistribution in BALB/c mice. In conclusion, we confirmed the possibility of radiolabeling NPs with 99mTc using the microfluidics and provide best formulation for tumor targeting studies.
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11
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Nagy C, Huszank R, Gaspar A. Study of the geometry of open channels in a layer-bed-type microfluidic immobilized enzyme reactor. Anal Bioanal Chem 2021; 413:6321-6332. [PMID: 34378068 PMCID: PMC8487885 DOI: 10.1007/s00216-021-03588-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 07/20/2021] [Accepted: 07/28/2021] [Indexed: 01/01/2023]
Abstract
This paper aims at studying open channel geometries in a layer-bed-type immobilized enzyme reactor with computer-aided simulations. The main properties of these reactors are their simple channel pattern, simple immobilization procedure, regenerability, and disposability; all these features make these devices one of the simplest yet efficient enzymatic microreactors. The high surface-to-volume ratio of the reactor was achieved using narrow (25–75 μm wide) channels. The simulation demonstrated that curves support the mixing of solutions in the channel even in strong laminar flow conditions; thus, it is worth including several curves in the channel system. In the three different designs of microreactor proposed, the lengths of the channels were identical, but in two reactors, the liquid flow was split to 8 or 32 parallel streams at the inlet of the reactor. Despite their overall higher volumetric flow rate, the split-flow structures are advantageous due to the increased contact time. Saliva samples were used to test the efficiencies of the digestions in the microreactors.
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Affiliation(s)
- Cynthia Nagy
- Department of Inorganic and Analytical Chemistry, University of Debrecen, Egyetem ter 1, Debrecen, 4032, Hungary
| | - Robert Huszank
- Institute for Nuclear Research (Atomki), P.O. Box 51, Debrecen, 4001, Hungary
| | - Attila Gaspar
- Department of Inorganic and Analytical Chemistry, University of Debrecen, Egyetem ter 1, Debrecen, 4032, Hungary.
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12
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Abstract
AbstractFast chemical process development is inevitably linked to an optimized determination of thermokinetic data of chemical reactions. A miniaturized flow calorimeter enables increased sensitivity when examining small amounts of reactants in a short time compared to traditional batch equipment. Therefore, a methodology to determine optimal reaction conditions for calorimetric measurement experiments was developed and is presented in this contribution. Within the methodology, short-cut calculations are supplemented by computational fluid dynamics (CFD) simulations for a better representation of the hydrodynamics within the microreactor. This approach leads to the effective design of experiments. Unfavourable experimental conditions for kinetics experiments are determined in advance and therefore, need not to be considered during design of experiments. The methodology is tested for an instantaneous acid-base reaction. Good agreement of simulations was obtained with experimental data. Thus, the prediction of the hydrodynamics is enabled and the first steps towards a digital twin of the calorimeter are performed. The flow rates proposed by the methodology are tested for the determination of reaction enthalpy and showed that reasonable experimental settings resulted.
Graphical abstract
A methodology is suggested to evaluate optimal reaction conditions for efficientacquisition of kinetic data. The experimental design space is limited by thestepwise determination of important time scales based on specified input data.
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Qamareen A, Ansari MA, Alam SS, Alazzam A. Modulation of secondary flows in curved serpentine micromixers. CHEM ENG COMMUN 2021. [DOI: 10.1080/00986445.2021.1887153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Arees Qamareen
- Department of Mechanical Engineering, Zakir Husain College of Engineering and Technology, Aligarh Muslim University, Aligarh, India
| | - Mubashshir A. Ansari
- Department of Mechanical Engineering, Zakir Husain College of Engineering and Technology, Aligarh Muslim University, Aligarh, India
| | - Shah S. Alam
- Department of Mechanical Engineering, Zakir Husain College of Engineering and Technology, Aligarh Muslim University, Aligarh, India
| | - Anas Alazzam
- Department of Mechanical Engineering, Khalifa University, Abu Dhabi, United Arab Emirates
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Jeon H, Jundi B, Choi K, Ryu H, Levy BD, Lim G, Han J. Fully-automated and field-deployable blood leukocyte separation platform using multi-dimensional double spiral (MDDS) inertial microfluidics. LAB ON A CHIP 2020; 20:3612-3624. [PMID: 32990714 DOI: 10.1039/d0lc00675k] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A fully-automated and portable leukocyte separation platform was developed based on a new type of inertial microfluidic device, multi-dimensional double spiral (MDDS) device, as an alternative to centrifugation. By combining key innovations in inertial microfluidic device designs and check-valve-based recirculation processes, highly purified and concentrated WBCs (up to >99.99% RBC removal, ∼80% WBC recovery, >85% WBC purity, and ∼12-fold concentrated WBCs compared to the input sample) were achieved in less than 5 minutes, with high reliability and repeatability (coefficient of variation, CV < 5%). Using this, one can harvest up to 0.4 million of intact WBCs from 50 μL of human peripheral blood (50 μL), without any cell damage or phenotypic changes in a fully-automated operation. Alternatively, hand-powered operation is demonstrated with comparable separation efficiency and speed, which eliminates the need for electricity altogether for truly field-friendly sample preparation. The proposed platform is therefore highly deployable for various point-of-care applications, including bedside assessment of the host immune response and blood sample processing in resource-limited environments.
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Affiliation(s)
- Hyungkook Jeon
- Research Laboratory of Electronics, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA. and Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk 37673, Republic of Korea
| | - Bakr Jundi
- Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA
| | - Kyungyong Choi
- Research Laboratory of Electronics, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA. and Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA
| | - Hyunryul Ryu
- Research Laboratory of Electronics, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.
| | - Bruce D Levy
- Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA
| | - Geunbae Lim
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk 37673, Republic of Korea
| | - Jongyoon Han
- Research Laboratory of Electronics, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA. and Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA and Department of Biological Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA
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Akpe V, Kim TH, Brown CL, Cock IE. Circulating tumour cells: a broad perspective. J R Soc Interface 2020; 17:20200065. [PMCID: PMC7423436 DOI: 10.1098/rsif.2020.0065] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Accepted: 07/09/2020] [Indexed: 08/13/2023] Open
Abstract
Circulating tumour cells (CTCs) have recently been identified as valuable biomarkers for diagnostic and prognostic evaluations, as well for monitoring therapeutic responses to treatments. CTCs are rare cells which may be present as one CTC surrounded by approximately 1 million white blood cells and 1 billion red blood cells per millilitre of peripheral blood. Despite the various challenges in CTC detection, considerable progress in detection methods have been documented in recent times, particularly for methodologies incorporating nanomaterial-based platforms and/or integrated microfluidics. Herein, we summarize the importance of CTCs as biological markers for tumour detection, highlight their mechanism of cellular invasion and discuss the various challenges associated with CTC research, including vulnerability, heterogeneity, phenotypicity and size differences. In addition, we describe nanomaterial agents used for electrochemistry and surface plasmon resonance applications, which have recently been used to selectively capture cancer cells and amplify signals for CTC detection. The intrinsic properties of nanomaterials have also recently been exploited to achieve photothermal destruction of cancer cells. This review describes recent advancements and future perspectives in the CTC field.
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Affiliation(s)
- Victor Akpe
- School of Environment and Science, Griffith University, Nathan Campus, Queensland 4111, Australia
- Environmental Futures Research Institute, Griffith University, Nathan Campus, Queensland 4111, Australia
| | - Tak H. Kim
- School of Environment and Science, Griffith University, Nathan Campus, Queensland 4111, Australia
- Environmental Futures Research Institute, Griffith University, Nathan Campus, Queensland 4111, Australia
| | - Christopher L. Brown
- School of Environment and Science, Griffith University, Nathan Campus, Queensland 4111, Australia
- Environmental Futures Research Institute, Griffith University, Nathan Campus, Queensland 4111, Australia
| | - Ian E. Cock
- School of Environment and Science, Griffith University, Nathan Campus, Queensland 4111, Australia
- Environmental Futures Research Institute, Griffith University, Nathan Campus, Queensland 4111, Australia
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A Review of Secondary Flow in Inertial Microfluidics. MICROMACHINES 2020; 11:mi11050461. [PMID: 32354106 PMCID: PMC7280964 DOI: 10.3390/mi11050461] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 04/23/2020] [Accepted: 04/27/2020] [Indexed: 11/17/2022]
Abstract
Inertial microfluidic technology, which can manipulate the target particle entirely relying on the microchannel characteristic geometry and intrinsic hydrodynamic effect, has attracted great attention due to its fascinating advantages of high throughput, simplicity, high resolution and low cost. As a passive microfluidic technology, inertial microfluidics can precisely focus, separate, mix or trap target particles in a continuous and high-flow-speed manner without any extra external force field. Therefore, it is promising and has great potential for a wide range of industrial, biomedical and clinical applications. In the regime of inertial microfluidics, particle migration due to inertial effects forms multiple equilibrium positions in straight channels. However, this is not promising for particle detection and separation. Secondary flow, which is a relatively minor flow perpendicular to the primary flow, may reduce the number of equilibrium positions as well as modify the location of particles focusing within channel cross sections by applying an additional hydrodynamic drag. For secondary flow, the pattern and magnitude can be controlled by the well-designed channel structure, such as curvature or disturbance obstacle. The magnitude and form of generated secondary flow are greatly dependent on the disturbing microstructure. Therefore, many inventive and delicate applications of secondary flow in inertial microfluidics have been reported. In this review, we comprehensively summarize the usage of the secondary flow in inertial microfluidics.
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Madadelahi M, Acosta-Soto LF, Hosseini S, Martinez-Chapa SO, Madou MJ. Mathematical modeling and computational analysis of centrifugal microfluidic platforms: a review. LAB ON A CHIP 2020; 20:1318-1357. [PMID: 32242566 DOI: 10.1039/c9lc00775j] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Centrifugal microfluidic platforms or lab-on-discs (LODs) have evolved into a popular technology for automating chemical and biological assays. LODs today enable scientists to implement and integrate different operational units, including fluid mixing, droplet generation, cell-sorting, gene amplification, analyte detection, and so forth. For an efficient design and cost-effective implementation of any microfluidic device, including LODs, theoretical analysis and considerations should play a more important role than they currently do. The theoretical analysis we will show is especially essential to the investigation of detailed phenomena at the small length scales and high-speed typical for LODs where a wide range of forces may be involved. Previous LOD review papers presented mostly experimental results with theory as an afterthought. Hence, a review paper focused on the theoretical aspects, and associated computational studies of LOD devices is an urgent need. In the present review paper, all previous computational studies on LOD devices are categorized as single-phase flows, two-phase flows, network simulation, and solids. For each of these categories, the governing equations and important formulas are presented and explained. Moreover, a handy scaling analysis is introduced to aid scientists when comparing different competing forces in LOD devices. We hope that by surveying and contrasting various theoretical LOD studies, we shed some light on existing controversies and reveal where additional theoretical work is needed.
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Affiliation(s)
- Masoud Madadelahi
- School of Engineering and Sciences, Tecnologico de Monterrey, Ave. Eugenio Garza Sada 2501, Monterrey 64849, NL, Mexico.
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Zhu S, Wu D, Han Y, Wang C, Xiang N, Ni Z. Inertial microfluidic cube for automatic and fast extraction of white blood cells from whole blood. LAB ON A CHIP 2020; 20:244-252. [PMID: 31833515 DOI: 10.1039/c9lc00942f] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We report here a novel inertial microfluidic (IM) cube integrated with lysis, storage and extraction modules for extracting white blood cells (WBCs) from whole blood automatically, harmlessly and quickly. Lysis, storage, and extraction modules are designed to realize the purposes of complete mixing of whole blood and lysing buffer, thorough lysis of red blood cells (RBCs), and automatic extraction of WBCs from the lysed background RBCs, respectively. After demonstrating its conceptual design, we characterize the performances of the lysis and extraction modules. The results show that a high mixing efficiency of 94.2% can be achieved using our lysis modules for complete mixing of whole blood and lysing buffer. In the extraction module, an extraction efficiency of 88.1% can be achieved for the extraction of WBCs. Finally, we successfully apply our IM cube for the high throughput extraction of WBCs from human whole blood with an extraction efficiency of 83.9% and a cell viability of 96.6%, which are comparable to those using centrifugation and even better in some aspects. Our IM cube is based on passive secondary-flow mixing and inertial sorting, offers the advantages of small footprint, high stability and simple fabrication, and is a promising alternative method for extracting WBCs from human blood.
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Affiliation(s)
- Shu Zhu
- School of Mechanical Engineering and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, 211189, China.
| | - Dan Wu
- Department of Oncology, Jiangyin People's Hospital, Jiangyin, 214400, China
| | - Yu Han
- School of Mechanical Engineering and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, 211189, China.
| | - Cailian Wang
- Tumor Center of Zhongda Hospital, Southeast University, Nanjing 210009, China
| | - Nan Xiang
- School of Mechanical Engineering and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, 211189, China.
| | - Zhonghua Ni
- School of Mechanical Engineering and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, 211189, China.
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19
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Hopley A, Doyle BJ, Roberge DM, Macchi A. Residence time distribution in coil and plate micro-reactors. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2019.06.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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20
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Electroosmosis modulated transient blood flow in curved microvessels: Study of a mathematical model. Microvasc Res 2019; 123:25-34. [DOI: 10.1016/j.mvr.2018.11.012] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 11/26/2018] [Accepted: 11/30/2018] [Indexed: 12/16/2022]
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21
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Reichmann F, Vennemann K, Frede TA, Kockmann N. Mixing Time Scale Determination in Microchannels Using Reaction Calorimetry. CHEM-ING-TECH 2019. [DOI: 10.1002/cite.201800169] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Felix Reichmann
- TU Dortmund UniversityDepartment of Biochemical and Chemical EngineeringLaboratory of Equipment Design Emil-Figge-Straße 68 44227 Dortmund Germany
| | - Kai Vennemann
- TU Dortmund UniversityDepartment of Biochemical and Chemical EngineeringLaboratory of Equipment Design Emil-Figge-Straße 68 44227 Dortmund Germany
| | - Timothy Aljoscha Frede
- TU Dortmund UniversityDepartment of Biochemical and Chemical EngineeringLaboratory of Equipment Design Emil-Figge-Straße 68 44227 Dortmund Germany
| | - Norbert Kockmann
- TU Dortmund UniversityDepartment of Biochemical and Chemical EngineeringLaboratory of Equipment Design Emil-Figge-Straße 68 44227 Dortmund Germany
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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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Dean Flow Dynamics in Low-Aspect Ratio Spiral Microchannels. Sci Rep 2017; 7:44072. [PMID: 28281579 PMCID: PMC5345076 DOI: 10.1038/srep44072] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Accepted: 02/01/2017] [Indexed: 12/23/2022] Open
Abstract
A wide range of microfluidic cell-sorting devices has emerged in recent years, based on both passive and active methods of separation. Curvilinear channel geometries are often used in these systems due to presence of secondary flows, which can provide high throughput and sorting efficiency. Most of these devices are designed on the assumption of two counter rotating Dean vortices present in the curved rectangular channels and existing in the state of steady rotation and amplitude. In this work, we investigate these secondary flows in low aspect ratio spiral rectangular microchannels and define their development with respect to the channel aspect ratio and Dean number. This work is the first to experimentally and numerically investigate Dean flows in microchannels for Re > 100, and show presence of secondary Dean vortices beyond a critical Dean number. We further demonstrate the impact of these multiple vortices on particle and cell focusing. Ultimately, this work offers new insights into secondary flow instabilities for low-aspect ratio, spiral microchannels, with improved flow models for design of more precise and efficient microfluidic devices for applications such as cell sorting and micromixing.
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Gelber MK, Kole MR, Kim N, Aluru NR, Bhargava R. Quantitative Chemical Imaging of Nonplanar Microfluidics. Anal Chem 2017; 89:1716-1723. [PMID: 27983804 DOI: 10.1021/acs.analchem.6b03943] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Confocal and multiphoton optical imaging techniques have been powerful tools for evaluating the performance of and monitoring experiments within microfluidic devices, but this application suffers from two pitfalls. The first is that obtaining the necessary imaging contrast often requires the introduction of an optical label which can potentially change the behavior of the system. The emerging analytical technique stimulated Raman scattering (SRS) microscopy promises a solution, as it can rapidly measure 3D concentration maps based on vibrational spectra, label-free; however, when using any optical imaging technique, including SRS, there is an additional problem of optical aberration due to refractive index mismatch between the fluid and the device walls. New approaches such as 3D printing are extending the range of materials from which microfluidic devices can be fabricated; thus, the problem of aberration can be obviated simply by selecting a chip material that matches the refractive index of the desired fluid. To demonstrate complete chemical imaging of a geometrically complex device, we first use sacrificial molding of a freeform 3D printed template to create a round-channel, 3D helical micromixer in a low-refractive-index polymer. We then use SRS to image the mixing of aqueous glucose and salt solutions throughout the entire helix volume. This fabrication approach enables truly nonperturbative 3D chemical imaging with low aberration, and the concentration profiles measured within the device agree closely with numerical simulations.
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Affiliation(s)
- Matthew K Gelber
- Beckman Institute for Advanced Science and Technology, ‡Department of Bioengineering, §Department of Mechanical Science and Engineering, and ∥Departments of Electrical & Computer Engineering, Chemical and Biomolecular Engineering and Chemistry, University of Illinois , Urbana, Illinois 61801, United States
| | - Matthew R Kole
- Beckman Institute for Advanced Science and Technology, ‡Department of Bioengineering, §Department of Mechanical Science and Engineering, and ∥Departments of Electrical & Computer Engineering, Chemical and Biomolecular Engineering and Chemistry, University of Illinois , Urbana, Illinois 61801, United States
| | - Namjung Kim
- Beckman Institute for Advanced Science and Technology, ‡Department of Bioengineering, §Department of Mechanical Science and Engineering, and ∥Departments of Electrical & Computer Engineering, Chemical and Biomolecular Engineering and Chemistry, University of Illinois , Urbana, Illinois 61801, United States
| | - Narayana R Aluru
- Beckman Institute for Advanced Science and Technology, ‡Department of Bioengineering, §Department of Mechanical Science and Engineering, and ∥Departments of Electrical & Computer Engineering, Chemical and Biomolecular Engineering and Chemistry, University of Illinois , Urbana, Illinois 61801, United States
| | - Rohit Bhargava
- Beckman Institute for Advanced Science and Technology, ‡Department of Bioengineering, §Department of Mechanical Science and Engineering, and ∥Departments of Electrical & Computer Engineering, Chemical and Biomolecular Engineering and Chemistry, University of Illinois , Urbana, Illinois 61801, United States
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Schwolow S, Braun F, Rädle M, Kockmann N, Röder T. Fast and Efficient Acquisition of Kinetic Data in Microreactors Using In-Line Raman Analysis. Org Process Res Dev 2015. [DOI: 10.1021/acs.oprd.5b00184] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sebastian Schwolow
- Mannheim University of Applied Sciences, Institute
of Chemical Process Engineering, Paul-Wittsack-Str. 10, 68163 Mannheim, Germany
| | - Frank Braun
- Mannheim University of Applied Sciences, Institute
of Process Control and Innovative Energy Conversion, Paul-Wittsack-Str. 10, 68163 Mannheim, Germany
| | - Matthias Rädle
- Mannheim University of Applied Sciences, Institute
of Process Control and Innovative Energy Conversion, Paul-Wittsack-Str. 10, 68163 Mannheim, Germany
- Heidelberg University and Mannheim University of Applied Sciences, Institute of Medical Technology, Paul-Wittsack-Str. 10, 68163 Mannheim, Germany
| | - Norbert Kockmann
- TU Dortmund University, Biochemical and Chemical
Engineering, Equipment Design, Emil-Figge-Straße 68, 44227 Dortmund, Germany
| | - Thorsten Röder
- Mannheim University of Applied Sciences, Institute
of Chemical Process Engineering, Paul-Wittsack-Str. 10, 68163 Mannheim, Germany
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Klutz S, Kurt SK, Lobedann M, Kockmann N. Narrow residence time distribution in tubular reactor concept for Reynolds number range of 10–100. Chem Eng Res Des 2015. [DOI: 10.1016/j.cherd.2015.01.003] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Chen Y, Xiong Y, Jiang W, Yan F, Guo M, Wang Q, Fan Y. Numerical simulation on the effects of drug eluting stents at different Reynolds numbers on hemodynamic and drug concentration distribution. Biomed Eng Online 2015; 14 Suppl 1:S16. [PMID: 25602685 PMCID: PMC4306105 DOI: 10.1186/1475-925x-14-s1-s16] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
Background The changes of hemodynamics and drug concentration distribution caused by the implantation of drug eluting stents (DESs) in curved vessels have significant effects on In-Stent Restenosis. Methods A 3D virtual stent with 90°curvature was modelled and the distribution of wall shear stress (WSS) and drug concentration in this model were numerically studied at Reynolds numbers of 200, 400, 600, 800. Results The results showed that (1) the intensity of secondary flow at the 45° cross-section was stronger than that at the 90° cross-section; (2) As the Reynolds number increases, the WSS decreases. When the Reynolds number reaches 600, the low-WSS region only accounts for 3% of the total area. (3) The effects of Reynolds number on drug concentration in the vascular wall decreases in proportionally and then the blood velocity increased 4 times, the drug concentration in the vascular wall decreased by about 30%. (4) The size of the high drug concentration region is inversely proportional to the Reynolds number. As the blood velocity increases, the drug concentration in the DES decreases, especially at the outer bend. Conclusions It is beneficial for the patient to decrease vigorous activities and keep calm at the beginning of the stent implantation, because a substantial amount of the drug is released in the first two months of stent implantation, thus a calm status is conducive to drug release and absorption; Subsequently, appropriate exercise which increases the blood velocity is helpful in decreasing regions of low-WSS.
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Daniele MA, Boyd DA, Adams AA, Ligler FS. Microfluidic strategies for design and assembly of microfibers and nanofibers with tissue engineering and regenerative medicine applications. Adv Healthc Mater 2015; 4:11-28. [PMID: 24853649 DOI: 10.1002/adhm.201400144] [Citation(s) in RCA: 118] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Revised: 04/25/2014] [Indexed: 01/04/2023]
Abstract
Fiber-based materials provide critical capabilities for biomedical applications. Microfluidic fiber fabrication has recently emerged as a very promising route to the synthesis of polymeric fibers at the micro and nanoscale, providing fine control over fiber shape, size, chemical anisotropy, and biological activity. This Progress Report summarizes advanced microfluidic methods for the fabrication of both microscale and nanoscale fibers and illustrates how different methods are enabling new biomedical applications. Microfluidic fabrication methods and resultant materials are explained from the perspective of their microfluidic device principles, including co-flow, cross-flow, and flow-shaping designs. It is then detailed how the microchannel design and flow parameters influence the variety of synthesis chemistries that can be utilized. Finally, the integration of biomaterials and microfluidic strategies is discussed to manufacture unique fiber-based systems, including cell scaffolds, cell encapsulation, and woven tissue matrices.
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Affiliation(s)
- Michael A. Daniele
- Center for Bio/Molecular Science and Engineering; Naval Research Laboratory; 4555 Overlook Ave. SW Washington D.C. 20375 USA
| | - Darryl A. Boyd
- Center for Bio/Molecular Science and Engineering; Naval Research Laboratory; 4555 Overlook Ave. SW Washington D.C. 20375 USA
| | - André A. Adams
- Center for Bio/Molecular Science and Engineering; Naval Research Laboratory; 4555 Overlook Ave. SW Washington D.C. 20375 USA
| | - Frances S. Ligler
- Department of Biomedical Engineering; University of North Carolina, Chapel Hill and North Carolina State University; Mail Stop 7115 Raleigh NC 27965-7115 USA
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Wang L, Ma S, Wang X, Bi H, Han X. Mixing enhancement of a passive microfluidic mixer containing triangle baffles. ASIA-PAC J CHEM ENG 2014. [DOI: 10.1002/apj.1837] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Lei Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Chemical Engineering and Technology; Harbin Institute of Technology; Harbin 150001 China
| | - Shenghua Ma
- State Key Laboratory of Urban Water Resource and Environment, School of Chemical Engineering and Technology; Harbin Institute of Technology; Harbin 150001 China
| | - Xuejing Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Chemical Engineering and Technology; Harbin Institute of Technology; Harbin 150001 China
| | - Hongmei Bi
- State Key Laboratory of Urban Water Resource and Environment, School of Chemical Engineering and Technology; Harbin Institute of Technology; Harbin 150001 China
| | - Xiaojun Han
- State Key Laboratory of Urban Water Resource and Environment, School of Chemical Engineering and Technology; Harbin Institute of Technology; Harbin 150001 China
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Kang JS, Lee KS, Kim SS, Bae GN, Jung JH. Real-time detection of an airborne microorganism using inertial impaction and mini-fluorescent microscopy. LAB ON A CHIP 2014; 14:244-251. [PMID: 24216775 DOI: 10.1039/c3lc50805f] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
To achieve successful real-time detection of airborne pathogenic microorganisms, the problem must be considered in terms of their physical size and biological characteristics. We developed an airborne microorganism detection chip to realize the detection of microorganisms, ensuring compactness, sensitivity, cost-efficiency, and portability, using three key components: an inertial impaction system, a cartridge-type impaction plate, and a mini-fluorescent microscope. The inertial impaction system was used to separate microorganisms in terms of their aerodynamic particle size, and was fabricated with three impaction stages. Numerical analysis was performed to design the system; the calculated cutoff diameter at each impaction stage was 2.02 (first stage), 0.88 (second stage), and 0.54 μm (third stage). The measured cutoff diameters were 2.24, 0.91, and 0.49 μm, respectively. A cartridge-type impaction plate was used, composed of molded polydimethylsiloxane (PDMS) and an actual impaction region made of a SYBR green I dye-stained agar plate. A mini-fluorescent microscope was used to distinguish microbes from non-biological particles. Images of the microorganisms deposited at the impaction zone were obtained via mini-fluorescent microscopy, and fluorescent intensities of the images were calculated using in-house image-processing software. The results showed that the developed system successfully identified aerosolized biological particles from non-biological particles in real time.
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Affiliation(s)
- Joon Sang Kang
- Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5 Seongbuk-gu, Seoul 136-791, Republic of Korea.
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Lee J, Lee MG, Jung C, Park YH, Song C, Choi MC, Park HG, Park JK. High-throughput nanoscale lipid vesicle synthesis in a semicircular contraction-expansion array microchannel. BIOCHIP JOURNAL 2013. [DOI: 10.1007/s13206-013-7303-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Strompen S, Weiß M, Gröger H, Hilterhaus L, Liese A. Development of a Continuously Operating Process for the Enantioselective Synthesis of a β-Amino Acid Esterviaa Solvent-Free Chemoenzymatic Reaction Sequence. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300236] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Kreppenhofer K, Li J, Segura R, Popp L, Rossi M, Tzvetkova P, Luy B, Kähler CJ, Guber AE, Levkin PA. Formation of a polymer surface with a gradient of pore size using a microfluidic chip. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:3797-3804. [PMID: 23427850 DOI: 10.1021/la304997a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Here we demonstrate the generation of polymer monolithic surfaces possessing a gradient of pore and polymer globule sizes from ~0.1 to ~0.5 μm defined by the composition of two polymerization mixtures injected into a microfluidic chip. To generate the gradient, we used a PDMS microfluidic chip with a cascade micromixer with a subsequent reaction chamber for the formation of a continuous gradient film. The micromixer has zigzag channels of 400 × 680 μm(2) cross section and six cascades. The chip was used with a reversible bonding connection, realized by curing agent coating. After polymerization in the microfluidic chip the reversible bond was opened, resulting in a 450 μm thick polymer film possessing the pore size gradient. The gradient formation in the microfluidic reaction chamber was studied using microscopic laser-induced fluorescence (μLIF) and different model fluids. Formation of linear gradients was shown using the fluids of the same density by both diffusive mixing at flow rates of 0.001 mL/min and in a convective mixing regime at flow rates of 20 mL/min. By using different density fluids, formation of a two-dimensional wedge-like gradient controlled by the density difference and orientation of the microfluidic chip was observed.
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Affiliation(s)
- Kristina Kreppenhofer
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Postfach 3640, 76021 Karlsruhe, Germany
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35
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Afzal A, Kim KY. Mixing Performance of Passive Micromixer with Sinusoidal Channel Walls. JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 2013. [DOI: 10.1252/jcej.12we144] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Arshad Afzal
- Department of Mechanical Engineering, Inha University
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36
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Yang J, Qi L, Chen Y, Ma H. Design and Fabrication of a Three Dimensional Spiral Micromixer. CHINESE J CHEM 2012. [DOI: 10.1002/cjoc.201200922] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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37
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Wang L, Liu D, Wang X, Han X. Mixing enhancement of novel passive microfluidic mixers with cylindrical grooves. Chem Eng Sci 2012. [DOI: 10.1016/j.ces.2012.07.004] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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38
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Pennella F, Rossi M, Ripandelli S, Rasponi M, Mastrangelo F, Deriu MA, Ridolfi L, Kähler CJ, Morbiducci U. Numerical and experimental characterization of a novel modular passive micromixer. Biomed Microdevices 2012; 14:849-62. [DOI: 10.1007/s10544-012-9665-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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39
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Xia G, Li J, Tian X, Zhou M. Analysis of Flow and Mixing Characteristics of Planar Asymmetric Split-and-Recombine (P-SAR) Micromixers with Fan-Shaped Cavities. Ind Eng Chem Res 2012. [DOI: 10.1021/ie2026234] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guodong Xia
- Key Laboratory
of Enhanced Heat Transfer and Energy Conservation, Ministry of Education,
College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| | - Jian Li
- Key Laboratory
of Enhanced Heat Transfer and Energy Conservation, Ministry of Education,
College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| | - Xinping Tian
- Key Laboratory
of Enhanced Heat Transfer and Energy Conservation, Ministry of Education,
College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| | - Mingzheng Zhou
- Key Laboratory
of Enhanced Heat Transfer and Energy Conservation, Ministry of Education,
College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
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40
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Sheu TS, Chen SJ, Chen JJ. Mixing of a split and recombine micromixer with tapered curved microchannels. Chem Eng Sci 2012. [DOI: 10.1016/j.ces.2011.12.042] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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41
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Marques MP, Fernandes P. Microfluidic devices: useful tools for bioprocess intensification. Molecules 2011; 16:8368-401. [PMID: 21963626 PMCID: PMC6264232 DOI: 10.3390/molecules16108368] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Revised: 09/21/2011] [Accepted: 09/28/2011] [Indexed: 11/16/2022] Open
Abstract
The dawn of the new millennium saw a trend towards the dedicated use of microfluidic devices for process intensification in biotechnology. As the last decade went by, it became evident that this pattern was not a short-lived fad, since the deliverables related to this field of research have been consistently piling-up. The application of process intensification in biotechnology is therefore seemingly catching up with the trend already observed in the chemical engineering area, where the use of microfluidic devices has already been upgraded to production scale. The goal of the present work is therefore to provide an updated overview of the developments centered on the use of microfluidic devices for process intensification in biotechnology. Within such scope, particular focus will be given to different designs, configurations and modes of operation of microreactors, but reference to similar features regarding microfluidic devices in downstream processing will not be overlooked. Engineering considerations and fluid dynamics issues, namely related to the characterization of flow in microchannels, promotion of micromixing and predictive tools, will also be addressed, as well as reflection on the analytics required to take full advantage of the possibilities provided by microfluidic devices in process intensification. Strategies developed to ease the implementation of experimental set-ups anchored in the use of microfluidic devices will be briefly tackled. Finally, realistic considerations on the current advantages and limitation on the use of microfluidic devices for process intensification, as well as prospective near future developments in the field, will be presented.
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Affiliation(s)
- Marco P.C. Marques
- Department of Bioengineering, Instituto Superior Técnico (IST), Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
- IBB-Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, IST, Lisboa, Portugal
| | - Pedro Fernandes
- Department of Bioengineering, Instituto Superior Técnico (IST), Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
- IBB-Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, IST, Lisboa, Portugal
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Golden JP, Justin GA, Nasir M, Ligler FS. Hydrodynamic focusing--a versatile tool. Anal Bioanal Chem 2011; 402:325-35. [PMID: 21952728 DOI: 10.1007/s00216-011-5415-3] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2011] [Revised: 09/09/2011] [Accepted: 09/11/2011] [Indexed: 11/29/2022]
Abstract
The control of hydrodynamic focusing in a microchannel has inspired new approaches for microfluidic mixing, separations, sensors, cell analysis, and microfabrication. Achieving a flat interface between the focusing and focused fluids is dependent on Reynolds number and device geometry, and many hydrodynamic focusing systems can benefit from this understanding. For applications where a specific cross-sectional shape is desired for the focused flow, advection generated by grooved structures in the channel walls can be used to define the shape of the focused flow. Relative flow rates of the focused flow and focusing streams can be manipulated to control the cross-sectional area of the focused flows. This paper discusses the principles for defining the shape of the interface between the focused and focusing fluids and provides examples from our lab that use hydrodynamic focusing for impedance-based sensors, flow cytometry, and microfabrication to illustrate the breadth of opportunities for introducing new capabilities into microfluidic systems. We evaluate each example for the advantages and limitations integral to utilization of hydrodynamic focusing for that particular application.
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Affiliation(s)
- Joel P Golden
- Naval Research Laboratory, Center for Bio/Molecular Science and Engineering, Washington, DC 20375, USA
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Chakraborty D, Madou M, Chakraborty S. Anomalous mixing behaviour in rotationally actuated microfluidic devices. LAB ON A CHIP 2011; 11:2823-6. [PMID: 21776486 DOI: 10.1039/c1lc20453j] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
We analyse the characteristics of two-fluid mixing in T-shaped microchannels on rotating platforms (Lab-on-a-Compact-Disk framework). Three regimes of mixing were identified based on the distinct flow behaviour in each of these regimes. A diffusion-based mixing regime was obtained for low rotation speeds. A Coriolis force based mixing regime was observed for intermediate rotation speeds, which introduced some nontrivial aspects in the mixing behaviour, which was explained through scaling analysis. At very high rotational speeds, rapid mixing close to the junction was achieved by exploiting flow instabilities (instability based mixing). A good agreement between the theoretical calculations and the experimental observations was obtained.
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Affiliation(s)
- Debapriya Chakraborty
- Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, India, 721302
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Chen JJ, Chen CH, Shie SR. Optimal designs of staggered dean vortex micromixers. Int J Mol Sci 2011; 12:3500-24. [PMID: 21747691 PMCID: PMC3131575 DOI: 10.3390/ijms12063500] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2011] [Revised: 05/19/2011] [Accepted: 05/25/2011] [Indexed: 11/29/2022] Open
Abstract
A novel parallel laminar micromixer with a two-dimensional staggered Dean Vortex micromixer is optimized and fabricated in our study. Dean vortices induced by centrifugal forces in curved rectangular channels cause fluids to produce secondary flows. The split-and-recombination (SAR) structures of the flow channels and the impinging effects result in the reduction of the diffusion distance of two fluids. Three different designs of a curved channel micromixer are introduced to evaluate the mixing performance of the designed micromixer. Mixing performances are demonstrated by means of a pH indicator using an optical microscope and fluorescent particles via a confocal microscope at different flow rates corresponding to Reynolds numbers (Re) ranging from 0.5 to 50. The comparison between the experimental data and numerical results shows a very reasonable agreement. At a Re of 50, the mixing length at the sixth segment, corresponding to the downstream distance of 21.0 mm, can be achieved in a distance 4 times shorter than when the Re equals 1. An optimization of this micromixer is performed with two geometric parameters. These are the angle between the lines from the center to two intersections of two consecutive curved channels, θ, and the angle between two lines of the centers of three consecutive curved channels, ϕ. It can be found that the maximal mixing index is related to the maximal value of the sum of θ and ϕ, which is equal to 139.82°.
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Affiliation(s)
- Jyh Jian Chen
- Department of Biomechatronics Engineering, National Pingtung University of Science and Technology, 1, Shuefu Road, Neipu, Pingtung 91201, Taiwan; E-Mails: (C.H.C.); (S.R.S.)
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45
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46
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47
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Kuo JS, Chiu DT. Controlling mass transport in microfluidic devices. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2011; 4:275-96. [PMID: 21456968 PMCID: PMC5724977 DOI: 10.1146/annurev-anchem-061010-113926] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Microfluidic platforms offer exquisite capabilities in controlling mass transport for biological studies. In this review, we focus on recent developments in manipulating chemical concentrations at the microscale. Some techniques prevent or accelerate mixing, whereas others shape the concentration gradients of chemical and biological molecules. We also highlight several in vitro biological studies in the areas of organ engineering, cancer, and blood coagulation that have benefited from accurate control of mass transfer.
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Affiliation(s)
- Jason S Kuo
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, USA
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48
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Huang H, Mao X, Lin SCS, Kiraly B, Huang Y, Huang TJ. Tunable two-dimensional liquid gradient refractive index (L-GRIN) lens for variable light focusing. LAB ON A CHIP 2010; 10:2387-93. [PMID: 20697662 DOI: 10.1039/c005071g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
We report a two-dimensional (2D) tunable liquid gradient refractive index (L-GRIN) lens for variable focusing of light in the out-of-plane direction. This lens focuses a light beam through a liquid medium with a 2D hyperbolic secant (HS) refractive index gradient. The refractive index gradient is established in a microfluidic chamber through the diffusion between two fluids with different refractive indices, i.e. CaCl(2) solution and deionized (DI) water. The 2D HS refractive index profile and subsequently the focal length of the L-GRIN lens can be tuned by changing the ratio of the flow rates of the CaCl(2) solution and DI water. The focusing effect is experimentally characterized through side-view and top-view image analysis, and the experimental data match well with the results from ray-tracing optical simulations. Advantages of the 2D L-GRIN lens include simple device fabrication procedure, low fluid consumption rate, convenient lens-tuning mechanism, and compatibility with existing microfluidic devices. We expect that with further optimizations, this 2D L-GRIN lens can be used in many optics-based lab-on-a-chip applications.
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Affiliation(s)
- Hua Huang
- Department of Microelectronics, Fudan University, Shanghai, PR China
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49
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Wang X, Yin X, Cheng H. Microflow injection chemiluminescence system with spiral microchannel for the determination of cisplatin in human serum. Anal Chim Acta 2010; 678:135-9. [PMID: 20888444 DOI: 10.1016/j.aca.2010.08.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2010] [Revised: 08/06/2010] [Accepted: 08/08/2010] [Indexed: 11/29/2022]
Abstract
A new microflow injection chemiluminescence (μFI-CL) system was described for the determination of cisplatin in human serum. By using the microchip with double spiral channel configuration, the sensitivity was greatly enhanced due to more efficient mixing of the analyte and reagent solutions. Experimental results revealed that common ions in human serum, such as Mn(2+), Co(2+), Fe(3+), Cu(2+), Zn(2+), Ni(2+), Na(+), K(+), Ca(2+), Cl(-), NO(3)(-), Ac(-), CO(3)(2-), PO(4)(3-), SO(4)(2-) did not cause interference with the detection of Pt(II) by using 1,10-phenanthroline as the masking agent. Under the optimized conditions, a linear calibration curve (R(2)=0.998) over the range 2.0 × 10(-8) to 2.0 × 10(-6) mol L(-1) was obtained with the detection limit of 1.24 × 10(-9) mol L(-1). The relative standard deviation was found to be 3.46% (n=12) for 2.0 × 10(-7) mol L(-1). The sample consumption was only 2 μL with the sample throughput of 72 h(-1). It had been used for trace platinum determination in cisplatin injection and human serum samples after the dosage of cisplatin. The recovery varied from 97.6 to 103.9%. The results proved that the proposed μFI-CL system had the advantages of high sensitivity and precision, low sample and reagents consumption, and high analytical throughput.
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Affiliation(s)
- Xiuzhong Wang
- Institute of Microanalytical Systems, Department of Chemistry, Zhejiang University, Hangzhou 310027, China
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50
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Theoretical and Experimental Investigations of Convective Micromixers and Microreactors for Chemical Reactions. MICRO AND MACRO MIXING 2010. [DOI: 10.1007/978-3-642-04549-3_18] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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