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Ahasan K, Schnoebelen NJ, Shrotriya P, Kingston TA. Continuous Sampling of Aerosolized Particles Using Stratified Two-Phase Microfluidics. ACS Sens 2024; 9:2915-2924. [PMID: 38848499 DOI: 10.1021/acssensors.4c00042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2024]
Abstract
Health and security concerns have made it essential to develop integrated, continuous collection and sensing platforms that are compact and capable of real-time detection. In this study, we numerically investigate the flow physics associated with the single-step collection and enrichment of aerosolized polystyrene microparticles into a flowing liquid using a stratified air-water flow in a U-shaped microchannel. We validate our simulation results by comparing them to experimental data from the literature. Additionally, we fabricate an identical microfluidic device using PDMS-based soft lithography and test it to corroborate the previously published experimental data. Diversion and entrapment efficiencies are used as evaluation metrics, both of which increase with increasing particle diameter and superficial air inlet velocity. Overall, our ANSYS Fluent two-dimensional (2D) and three-dimensional (3D) multiphase flow simulations exhibit a good agreement with our experimental data and data in the literature (average deviation of ∼11%) in terms of diversion efficiency. Simulations also found the entrapment efficiency to be lower than the diversion efficiency, indicating discrepancies in the literature in terms of captured particles. The effect of the Dean force on the flow physics was also investigated using 3D simulations. We found that the effect of the Dean flow was more dominant relative to the centrifugal force on the smaller particles (e.g., 0.65 μm) compared to the larger particles (e.g., 2.1 μm). Increasing the superficial air inlet velocity also increases the effect of the centrifugal forces relative to the Dean forces. Overall, this experimentally validated multiphase model decouples and investigates the multiple and simultaneous forces on aerosolized particles flowing through a curved microchannel, which is crucial for designing more efficient capture devices. Once integrated with a microfluidic-based biosensor, this stratified flow-based microfluidic biothreat capture platform should deliver continuous sensor-ready enriched biosamples for real-time sensing.
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Affiliation(s)
- Kawkab Ahasan
- Center for Multiphase Flow Research and Education, Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Nicholas J Schnoebelen
- Center for Multiphase Flow Research and Education, Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Pranav Shrotriya
- Center for Multiphase Flow Research and Education, Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Todd A Kingston
- Center for Multiphase Flow Research and Education, Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, United States
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2
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Fang C, Xiao Y, Qiu W, Zhang H, Zhao T, Zou R, Luo G, Yao H. Improving Fine Particle Removal Using a Single-Channel Slit Bubbling Device in Wet Flue Gas Desulfurization System. ACS OMEGA 2024; 9:9321-9330. [PMID: 38434889 PMCID: PMC10905572 DOI: 10.1021/acsomega.3c08250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Revised: 12/12/2023] [Accepted: 01/08/2024] [Indexed: 03/05/2024]
Abstract
To improve the cleanliness of coal-fired power plants' particulate matter emissions, a novel device (single-channel slit bubbling particle removal device (SCSB-PRD)) is proposed to improve the wet flue gas desulfurization system's (WFGDs) collaborative particle removal effect. Actual coal-fired flue gas was used to test the particle removal performance. The results showed that the flue gas temperature had no obvious effect on the scrubbing effect of the SCSB-PRD. The scrubbing space, scrubbing liquid volume, and flue gas flow rate effectively changed the gas-liquid flow state, and the bubbling state was the key factor in particle removal. The jet-bubbling contact state was more conducive to removing particles than the foam bubbling state. The jet-bubbling state improved the removal efficiency of fine particles by approximately 30% compared to the foam bubbling state. The device operated in a single stage, and the removal performance of the particulate matter reached more than 60%. Even the submicron particles had a satisfactory removal performance of greater than 50%. The particulate matter concentration at the outlet of the WFGDs was reduced to less than 10 mg/m3, which provides a feasible transformation path for ultraultra-low emissions of particulate matter from coal-fired power plants.
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Affiliation(s)
- Can Fang
- State
Key Laboratory of Coal Combustion (SKLCC), School of Energy and Power
Engineering, Huazhong University of Science
and Technology, Wuhan, Hubei 430074, China
| | - Yi Xiao
- State
Key Laboratory of Coal Combustion (SKLCC), School of Energy and Power
Engineering, Huazhong University of Science
and Technology, Wuhan, Hubei 430074, China
| | - Wencong Qiu
- State
Key Laboratory of Coal Combustion (SKLCC), School of Energy and Power
Engineering, Huazhong University of Science
and Technology, Wuhan, Hubei 430074, China
| | - Haoyu Zhang
- State
Key Laboratory of Coal Combustion (SKLCC), School of Energy and Power
Engineering, Huazhong University of Science
and Technology, Wuhan, Hubei 430074, China
| | - Tianyu Zhao
- State
Key Laboratory of Coal Combustion (SKLCC), School of Energy and Power
Engineering, Huazhong University of Science
and Technology, Wuhan, Hubei 430074, China
| | - Renjie Zou
- State
Key Laboratory of Coal Combustion (SKLCC), School of Energy and Power
Engineering, Huazhong University of Science
and Technology, Wuhan, Hubei 430074, China
| | - Guangqian Luo
- State
Key Laboratory of Coal Combustion (SKLCC), School of Energy and Power
Engineering, Huazhong University of Science
and Technology, Wuhan, Hubei 430074, China
- Shenzhen
Huazhong University of Science and Technology Research Institute, Shenzhen, Guangdong 518052, China
| | - Hong Yao
- State
Key Laboratory of Coal Combustion (SKLCC), School of Energy and Power
Engineering, Huazhong University of Science
and Technology, Wuhan, Hubei 430074, China
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3
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Rastmanesh A, Boruah JS, Lee MS, Park S. On-Site Bioaerosol Sampling and Airborne Microorganism Detection Technologies. BIOSENSORS 2024; 14:122. [PMID: 38534229 DOI: 10.3390/bios14030122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Revised: 02/09/2024] [Accepted: 02/21/2024] [Indexed: 03/28/2024]
Abstract
Bioaerosols are small airborne particles composed of microbiological fragments, including bacteria, viruses, fungi, pollens, and/or by-products of cells, which may be viable or non-viable wherever applicable. Exposure to these agents can cause a variety of health issues, such as allergic and infectious diseases, neurological disorders, and cancer. Therefore, detecting and identifying bioaerosols is crucial, and bioaerosol sampling is a key step in any bioaerosol investigation. This review provides an overview of the current bioaerosol sampling methods, both passive and active, as well as their applications and limitations for rapid on-site monitoring. The challenges and trends for detecting airborne microorganisms using molecular and immunological methods are also discussed, along with a summary and outlook for the development of prompt monitoring technologies.
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Affiliation(s)
- Afagh Rastmanesh
- Complex Fluids Laboratory, School of Mechanical Engineering, Korea University of Technology and Education, Cheonan 31253, Chungnam, Republic of Korea
| | - Jayanta S Boruah
- Complex Fluids Laboratory, School of Mechanical Engineering, Korea University of Technology and Education, Cheonan 31253, Chungnam, Republic of Korea
| | - Min-Seok Lee
- Complex Fluids Laboratory, School of Mechanical Engineering, Korea University of Technology and Education, Cheonan 31253, Chungnam, Republic of Korea
| | - Seungkyung Park
- Complex Fluids Laboratory, School of Mechanical Engineering, Korea University of Technology and Education, Cheonan 31253, Chungnam, Republic of Korea
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4
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Qiu G, Zhang X, deMello AJ, Yao M, Cao J, Wang J. On-site airborne pathogen detection for infection risk mitigation. Chem Soc Rev 2023; 52:8531-8579. [PMID: 37882143 PMCID: PMC10712221 DOI: 10.1039/d3cs00417a] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Indexed: 10/27/2023]
Abstract
Human-infecting pathogens that transmit through the air pose a significant threat to public health. As a prominent instance, the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) that caused the COVID-19 pandemic has affected the world in an unprecedented manner over the past few years. Despite the dissipating pandemic gloom, the lessons we have learned in dealing with pathogen-laden aerosols should be thoroughly reviewed because the airborne transmission risk may have been grossly underestimated. From a bioanalytical chemistry perspective, on-site airborne pathogen detection can be an effective non-pharmaceutic intervention (NPI) strategy, with on-site airborne pathogen detection and early-stage infection risk evaluation reducing the spread of disease and enabling life-saving decisions to be made. In light of this, we summarize the recent advances in highly efficient pathogen-laden aerosol sampling approaches, bioanalytical sensing technologies, and the prospects for airborne pathogen exposure measurement and evidence-based transmission interventions. We also discuss open challenges facing general bioaerosols detection, such as handling complex aerosol samples, improving sensitivity for airborne pathogen quantification, and establishing a risk assessment system with high spatiotemporal resolution for mitigating airborne transmission risks. This review provides a multidisciplinary outlook for future opportunities to improve the on-site airborne pathogen detection techniques, thereby enhancing the preparedness for more on-site bioaerosols measurement scenarios, such as monitoring high-risk pathogens on airplanes, weaponized pathogen aerosols, influenza variants at the workplace, and pollutant correlated with sick building syndromes.
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Affiliation(s)
- Guangyu Qiu
- Institute of Medical Robotics, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
- Institute of Environmental Engineering, ETH Zürich, Zürich 8093, Switzerland
- Laboratory for Advanced Analytical Technologies, Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf 8600, Switzerland
| | - Xiaole Zhang
- Institute of Environmental Engineering, ETH Zürich, Zürich 8093, Switzerland
- Laboratory for Advanced Analytical Technologies, Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf 8600, Switzerland
| | - Andrew J deMello
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg1, Zürich, Switzerland
| | - Maosheng Yao
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, China
| | - Junji Cao
- Institute of Atmospheric Physics, Chinese Academy of Science, China
| | - Jing Wang
- Institute of Environmental Engineering, ETH Zürich, Zürich 8093, Switzerland
- Laboratory for Advanced Analytical Technologies, Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf 8600, Switzerland
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5
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Kumar A, Heidari-Bafroui H, Rahmani N, Anagnostopoulos C, Faghri M. Modeling of Paper-Based Bi-Material Cantilever Actuator for Microfluidic Biosensors. BIOSENSORS 2023; 13:580. [PMID: 37366945 DOI: 10.3390/bios13060580] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 05/23/2023] [Accepted: 05/24/2023] [Indexed: 06/28/2023]
Abstract
This research explores the dynamics of a fluidically loaded Bi-Material cantilever (B-MaC), a critical component of μPADs (microfluidic paper-based analytical devices) used in point-of-care diagnostics. Constructed from Scotch Tape and Whatman Grade 41 filter paper strips, the B-MaC's behavior under fluid imbibition is examined. A capillary fluid flow model is formulated for the B-MaC, adhering to the Lucas-Washburn (LW) equation, and supported by empirical data. This paper further investigates the stress-strain relationship to estimate the modulus of the B-MaC at various saturation levels and to predict the behavior of the fluidically loaded cantilever. The study shows that the Young's modulus of Whatman Grade 41 filter paper drastically decreases to approximately 20 MPa (about 7% of its dry-state value) upon full saturation. This significant decrease in flexural rigidity, in conjunction with the hygroexpansive strain and coefficient of hygroexpansion (empirically deduced to be 0.008), is essential in determining the B-MaC's deflection. The proposed moderate deflection formulation effectively predicts the B-MaC's behavior under fluidic loading, emphasizing the measurement of maximum (tip) deflection using interfacial boundary conditions for the B-MaC's wet and dry regions. This knowledge of tip deflection will prove instrumental in optimizing the design parameters of B-MaCs.
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Affiliation(s)
- Ashutosh Kumar
- Microfluidics Laboratory, Department of Mechanical, Industrial and Systems Engineering, University of Rhode Island, 2 East Alumni Avenue, Kingston, RI 02881, USA
| | - Hojat Heidari-Bafroui
- Microfluidics Laboratory, Department of Mechanical, Industrial and Systems Engineering, University of Rhode Island, 2 East Alumni Avenue, Kingston, RI 02881, USA
| | - Nassim Rahmani
- Microfluidics Laboratory, Department of Mechanical, Industrial and Systems Engineering, University of Rhode Island, 2 East Alumni Avenue, Kingston, RI 02881, USA
| | - Constantine Anagnostopoulos
- Microfluidics Laboratory, Department of Mechanical, Industrial and Systems Engineering, University of Rhode Island, 2 East Alumni Avenue, Kingston, RI 02881, USA
| | - Mohammad Faghri
- Microfluidics Laboratory, Department of Mechanical, Industrial and Systems Engineering, University of Rhode Island, 2 East Alumni Avenue, Kingston, RI 02881, USA
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6
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Luo Y, Zhang Y, Liu T, Yu A, Wu Y, Ozcan A. Virtual Impactor-Based Label-Free Pollen Detection using Holography and Deep Learning. ACS Sens 2022; 7:3885-3894. [PMID: 36414385 DOI: 10.1021/acssensors.2c01890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Exposure to bio-aerosols such as pollen can lead to adverse health effects. There is a need for a portable and cost-effective device for long-term monitoring and quantification of various types of pollen. To address this need, we present a mobile and cost-effective label-free sensor that takes holographic images of flowing particulate matter (PM) concentrated by a virtual impactor, which selectively slows down and guides particles larger than 6 μm to fly through an imaging window. The flowing particles are illuminated by a pulsed laser diode, casting their inline holograms on a complementary metal-oxide semiconductor image sensor in a lens-free mobile imaging device. The illumination contains three short pulses with a negligible shift of the flowing particle within one pulse, and triplicate holograms of the same particle are recorded at a single frame before it exits the imaging field-of-view, revealing different perspectives of each particle. The particles within the virtual impactor are localized through a differential detection scheme, and a deep neural network classifies the pollen type in a label-free manner based on the acquired holographic images. We demonstrated the success of this mobile pollen detector with a virtual impactor using different types of pollen (i.e., bermuda, elm, oak, pine, sycamore, and wheat) and achieved a blind classification accuracy of 92.91%. This mobile and cost-effective device weighs ∼700 g and can be used for label-free sensing and quantification of various bio-aerosols over extended periods since it is based on a cartridge-free virtual impactor that does not capture or immobilize PM.
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Affiliation(s)
- Yi Luo
- Electrical and Computer Engineering Department, University of California, Los Angeles, California 90095, United States.,Bioengineering Department, University of California, Los Angeles, California 90095, United States.,California Nano Systems Institute (CNSI), University of California, Los Angeles, California 90095, United States
| | - Yijie Zhang
- Electrical and Computer Engineering Department, University of California, Los Angeles, California 90095, United States.,Bioengineering Department, University of California, Los Angeles, California 90095, United States.,California Nano Systems Institute (CNSI), University of California, Los Angeles, California 90095, United States
| | - Tairan Liu
- Electrical and Computer Engineering Department, University of California, Los Angeles, California 90095, United States.,Bioengineering Department, University of California, Los Angeles, California 90095, United States.,California Nano Systems Institute (CNSI), University of California, Los Angeles, California 90095, United States
| | - Alan Yu
- Electrical and Computer Engineering Department, University of California, Los Angeles, California 90095, United States.,Computer Science Department, University of California, Los Angeles, California 90095, United States
| | - Yichen Wu
- Electrical and Computer Engineering Department, University of California, Los Angeles, California 90095, United States.,Bioengineering Department, University of California, Los Angeles, California 90095, United States.,California Nano Systems Institute (CNSI), University of California, Los Angeles, California 90095, United States
| | - Aydogan Ozcan
- Electrical and Computer Engineering Department, University of California, Los Angeles, California 90095, United States.,Bioengineering Department, University of California, Los Angeles, California 90095, United States.,California Nano Systems Institute (CNSI), University of California, Los Angeles, California 90095, United States
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7
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Krokhine S, Torabi H, Doostmohammadi A, Rezai P. Conventional and microfluidic methods for airborne virus isolation and detection. Colloids Surf B Biointerfaces 2021; 206:111962. [PMID: 34352699 PMCID: PMC8249716 DOI: 10.1016/j.colsurfb.2021.111962] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 06/22/2021] [Accepted: 06/29/2021] [Indexed: 12/23/2022]
Abstract
With the COVID-19 pandemic, the threat of infectious diseases to public health and safety has become much more apparent. Viral, bacterial and fungal diseases have led to the loss of millions of lives, especially in the developing world. Diseases caused by airborne viruses like SARS-CoV-2 are difficult to control, as these viruses are easily transmissible and can circulate in the air for hours. To contain outbreaks of viruses such as SARS-CoV-2 and institute targeted precautions, it is important to detect them in air and understand how they infect their targets. Point-of-care (PoC) diagnostics and point-of-need (PoN) detection methods are necessary to rapidly test patient and environmental samples, so precautions can immediately be applied. Traditional benchtop detection methods such as ELISA, PCR and culture are not suitable for PoC and PoN monitoring, because they can take hours to days and require specialized equipment. Microfluidic devices can be made at low cost to perform such assays rapidly and at the PoN. They can also be integrated with air- and liquid-based sampling technologies to capture and analyze viruses from air and body fluids. Here, conventional and microfluidic virus detection methods are reviewed and compared. The use of air sampling devices to capture and concentrate viruses is discussed first, followed by a review of analysis methods such as immunoassays, RT-PCR and isothermal amplification in conventional and microfluidic platforms. This review provides an overview of the capabilities of microfluidics in virus handling and detection, which will be useful to infectious disease researchers, biomedical engineers, and public health agencies.
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Affiliation(s)
- Sophie Krokhine
- Faculty of Science, McMaster University, Burke Science Building, 1280 Main Street West, Hamilton, ON L8S 4K1, Canada.
| | - Hadis Torabi
- Department of Biomedical Engineering, University of Isfahan, Iran.
| | | | - Pouya Rezai
- Department of Mechanical Engineering, York University, ON, Canada.
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8
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Wang L, Qi W, Liu Y, Essien D, Zhang Q, Lin J. Recent Advances on Bioaerosol Collection and Detection in Microfluidic Chips. Anal Chem 2021; 93:9013-9022. [PMID: 34160193 DOI: 10.1021/acs.analchem.1c00908] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Bioaerosols containing pathogenic microorganisms have posed a great threat to human and animal health. Effective monitoring of bioaerosols containing pathogenic viruses and bacteria is of great significance to prevent and control infectious diseases. This Feature summarizes recent advances on bioaerosol collection and detection based on microfluidic chips. Besides, the challenges and trends for bioaerosol collection and detection were also discussed.
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Affiliation(s)
- Lei Wang
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing 100083, China.,Department of Biosystems Engineering, University of Manitoba, Winnipeg, Manitoba R3T 5V6, Canada
| | - Wuzhen Qi
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing 100083, China
| | - Yuanjie Liu
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing 100083, China
| | - Desmond Essien
- Department of Biosystems Engineering, University of Manitoba, Winnipeg, Manitoba R3T 5V6, Canada
| | - Qiang Zhang
- Department of Biosystems Engineering, University of Manitoba, Winnipeg, Manitoba R3T 5V6, Canada
| | - Jianhan Lin
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing 100083, China
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9
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Gao Y, Wu M, Lin Y, Xu J. Trapping and control of bubbles in various microfluidic applications. LAB ON A CHIP 2020; 20:4512-4527. [PMID: 33232419 DOI: 10.1039/d0lc00906g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
As a simple, clean and effective tool, micro bubbles have enabled advances in various lab on a chip (LOC) applications recently. In bubble-based microfluidic applications, techniques for capturing and controlling the bubbles play an important role. Here we review active and passive techniques for bubble trapping and control in microfluidic applications. The active techniques are categorized based on various types of external forces from optical, electric, acoustic, mechanical and thermal fields. The passive approaches depend on surface tension, focusing on optimization of microgeometry and modification of surface properties. We discuss control techniques of size, location and stability of microbubbles and show how these bubbles are employed in various applications. To finalize, by highlighting the advantages of these approaches along with the current challenges, we discuss the future prospects of bubble trapping and control in microfluidic applications.
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Affiliation(s)
- Yuan Gao
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, USA.
| | - Mengren Wu
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, USA.
| | - Yang Lin
- Department of Mechanical, Industrial and Systems Engineering, University of Rhode Island, Kingston, USA
| | - Jie Xu
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, USA.
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10
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Peng S, Chen Q, Liu E. The role of computational fluid dynamics tools on investigation of pathogen transmission: Prevention and control. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 746:142090. [PMID: 33027870 PMCID: PMC7458093 DOI: 10.1016/j.scitotenv.2020.142090] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Revised: 08/28/2020] [Accepted: 08/28/2020] [Indexed: 05/17/2023]
Abstract
Transmission mechanics of infectious pathogen in various environments are of great complexity and has always been attracting many researchers' attention. As a cost-effective and powerful method, Computational Fluid Dynamics (CFD) plays an important role in numerically solving environmental fluid mechanics. Besides, with the development of computer science, an increasing number of researchers start to analyze pathogen transmission by using CFD methods. Inspired by the impact of COVID-19, this review summarizes research works of pathogen transmission based on CFD methods with different models and algorithms. Defining the pathogen as the particle or gaseous in CFD simulation is a common method and epidemic models are used in some investigations to rise the authenticity of calculation. Although it is not so difficult to describe the physical characteristics of pathogens, how to describe the biological characteristics of it is still a big challenge in the CFD simulation. A series of investigations which analyzed pathogen transmission in different environments (hospital, teaching building, etc) demonstrated the effect of airflow on pathogen transmission and emphasized the importance of reasonable ventilation. Finally, this review presented three advanced methods: LBM method, Porous Media method, and Web-based forecasting method. Although CFD methods mentioned in this review may not alleviate the current pandemic situation, it helps researchers realize the transmission mechanisms of pathogens like viruses and bacteria and provides guidelines for reducing infection risk in epidemic or pandemic situations.
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Affiliation(s)
- Shanbi Peng
- School of Civil Engineering and Geomatics, Southwest Petroleum University, Chengdu 610500, China
| | - Qikun Chen
- School of Engineering, Cardiff University, CF24 0DE, UK.
| | - Enbin Liu
- School of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China
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11
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Porter GCE, Sikora SNF, Shim JU, Murray BJ, Tarn MD. On-chip density-based sorting of supercooled droplets and frozen droplets in continuous flow. LAB ON A CHIP 2020; 20:3876-3887. [PMID: 32966480 DOI: 10.1039/d0lc00690d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The freezing of supercooled water to ice and the materials which catalyse this process are of fundamental interest to a wide range of fields. At present, our ability to control, predict or monitor ice formation processes is poor. The isolation and characterisation of frozen droplets from supercooled liquid droplets would provide a means of improving our understanding and control of these processes. Here, we have developed a microfluidic platform for the continuous flow separation of frozen from unfrozen picolitre droplets based on differences in their density, thus allowing the sorting of ice crystals and supercooled water droplets into different outlet channels with 94 ± 2% efficiency. This will, in future, facilitate downstream or off-chip processing of the frozen and unfrozen populations, which could include the analysis and characterisation of ice-active materials or the selection of droplets with a particular ice-nucleating activity.
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Affiliation(s)
- Grace C E Porter
- School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK. and School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, UK
| | | | - Jung-Uk Shim
- School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, UK
| | - Benjamin J Murray
- School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK.
| | - Mark D Tarn
- School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK. and School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, UK
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12
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Tarn MD, Sikora SNF, Porter GCE, Wyld BV, Alayof M, Reicher N, Harrison AD, Rudich Y, Shim JU, Murray BJ. On-chip analysis of atmospheric ice-nucleating particles in continuous flow. LAB ON A CHIP 2020; 20:2889-2910. [PMID: 32661539 DOI: 10.1039/d0lc00251h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Ice-nucleating particles (INPs) are of atmospheric importance because they catalyse the freezing of supercooled cloud droplets, strongly affecting the lifetime and radiative properties of clouds. There is a need to improve our knowledge of the global distribution of INPs, their seasonal cycles and long-term trends, but our capability to make these measurements is limited. Atmospheric INP concentrations are often determined using assays involving arrays of droplets on a cold stage, but such assays are frequently limited by the number of droplets that can be analysed per experiment, often involve manual processing (e.g. pipetting of droplets), and can be susceptible to contamination. Here, we present a microfluidic platform, the LOC-NIPI (Lab-on-a-Chip Nucleation by Immersed Particle Instrument), for the generation of water-in-oil droplets and their freezing in continuous flow as they pass over a cold plate for atmospheric INP analysis. LOC-NIPI allows the user to define the number of droplets analysed by simply running the platform for as long as required. The use of small (∼100 μm diameter) droplets minimises the probability of contamination in any one droplet and therefore allows supercooling all the way down to homogeneous freezing (around -36 °C), while a temperature probe in a proxy channel provides an accurate measure of temperature without the need for temperature modelling. The platform was validated using samples of pollen extract and Snomax®, with hundreds of droplets analysed per temperature step and thousands of droplets being measured per experiment. Homogeneous freezing of purified water was studied using >10 000 droplets with temperature increments of 0.1 °C. The results were reproducible, independent of flow rate in the ranges tested, and the data compared well to conventional instrumentation and literature data. The LOC-NIPI was further benchmarked in a field campaign in the Eastern Mediterranean against other well-characterised instrumentation. The continuous flow nature of the system provides a route, with future development, to the automated monitoring of atmospheric INP at field sites around the globe.
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Affiliation(s)
- Mark D Tarn
- School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK. and School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, UK.
| | | | - Grace C E Porter
- School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK. and School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, UK.
| | - Bethany V Wyld
- School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK.
| | - Matan Alayof
- Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Naama Reicher
- Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot 76100, Israel
| | | | - Yinon Rudich
- Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Jung-Uk Shim
- School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, UK.
| | - Benjamin J Murray
- School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK.
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13
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Pan W, Chen X, Dai G, Wang F. Enhanced Effect of Bubble Deformation on Internal Particle Transport. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.9b05158] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Tenjimbayashi M, Doi K, Naito M. Microbubble flows in superwettable fluidic channels. RSC Adv 2019; 9:21220-21224. [PMID: 35521302 PMCID: PMC9066019 DOI: 10.1039/c9ra04212a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 06/27/2019] [Indexed: 12/30/2022] Open
Abstract
The control of bubble adhesion underwater is important for various applications, yet the dynamics under flow conditions are still to be unraveled. Herein, we observed the wetting dynamics of an underwater microbubble stream in superwettable channels. The flow of microbubbles was generated by integrating a microfluidic device with an electrochemical system. The microbubble motions were visualized via tracing the flow using a high-speed camera. We show that a vortex is generated in the air layer of the superaerophilic surface under laminar conditions and that the microbubbles are transported on the superaerophilic surface under turbulent conditions driven by the dynamic motion of the air film. Furthermore, microbubbles oscillated backward and forward on the superaerophobic surface under turbulent conditions. This investigation contributes to our understanding of the principles of drag reduction through wettability control and bubble flow.
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Affiliation(s)
- Mizuki Tenjimbayashi
- Research and Services Division of Materials Data and Integrated System (MaDIS), National Institute for Materials Science (NIMS) 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan
| | - Kotaro Doi
- Research Center for Structural Materials, National Institute for Materials Science (NIMS) 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan
| | - Masanobu Naito
- Research and Services Division of Materials Data and Integrated System (MaDIS), National Institute for Materials Science (NIMS) 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan
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15
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Tarn MD, Sikora SNF, Porter GCE, O’Sullivan D, Adams M, Whale TF, Harrison AD, Vergara-Temprado J, Wilson TW, Shim JU, Murray BJ. The study of atmospheric ice-nucleating particles via microfluidically generated droplets. MICROFLUIDICS AND NANOFLUIDICS 2018; 22:52. [PMID: 29720926 PMCID: PMC5915516 DOI: 10.1007/s10404-018-2069-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Accepted: 04/05/2018] [Indexed: 05/10/2023]
Abstract
Ice-nucleating particles (INPs) play a significant role in the climate and hydrological cycle by triggering ice formation in supercooled clouds, thereby causing precipitation and affecting cloud lifetimes and their radiative properties. However, despite their importance, INP often comprise only 1 in 103-106 ambient particles, making it difficult to ascertain and predict their type, source, and concentration. The typical techniques for quantifying INP concentrations tend to be highly labour-intensive, suffer from poor time resolution, or are limited in sensitivity to low concentrations. Here, we present the application of microfluidic devices to the study of atmospheric INPs via the simple and rapid production of monodisperse droplets and their subsequent freezing on a cold stage. This device offers the potential for the testing of INP concentrations in aqueous samples with high sensitivity and high counting statistics. Various INPs were tested for validation of the platform, including mineral dust and biological species, with results compared to literature values. We also describe a methodology for sampling atmospheric aerosol in a manner that minimises sampling biases and which is compatible with the microfluidic device. We present results for INP concentrations in air sampled during two field campaigns: (1) from a rural location in the UK and (2) during the UK's annual Bonfire Night festival. These initial results will provide a route for deployment of the microfluidic platform for the study and quantification of INPs in upcoming field campaigns around the globe, while providing a benchmark for future lab-on-a-chip-based INP studies.
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Affiliation(s)
- Mark D. Tarn
- School of Earth and Environment, University of Leeds, Leeds, LS2 9JT UK
- School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT UK
| | | | - Grace C. E. Porter
- School of Earth and Environment, University of Leeds, Leeds, LS2 9JT UK
- School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT UK
| | - Daniel O’Sullivan
- School of Earth and Environment, University of Leeds, Leeds, LS2 9JT UK
| | - Mike Adams
- School of Earth and Environment, University of Leeds, Leeds, LS2 9JT UK
| | - Thomas F. Whale
- School of Earth and Environment, University of Leeds, Leeds, LS2 9JT UK
| | | | - Jesús Vergara-Temprado
- School of Earth and Environment, University of Leeds, Leeds, LS2 9JT UK
- Present Address: Institute for Atmospheric and Climate Science, ETH Zürich, Universitätstrasse 16, 8092 Zurich, Switzerland
| | - Theodore W. Wilson
- School of Earth and Environment, University of Leeds, Leeds, LS2 9JT UK
- Present Address: Owlstone Medical Ltd., 127 Science Park, Cambridge, CB4 0GD UK
| | - Jung-uk Shim
- School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT UK
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