1
|
Takayama T, Maki H. Independent Concentration Manipulation Using Sidewall-Driven Micromixer. MICROMACHINES 2024; 15:869. [PMID: 39064379 PMCID: PMC11278770 DOI: 10.3390/mi15070869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2024] [Revised: 06/26/2024] [Accepted: 06/29/2024] [Indexed: 07/28/2024]
Abstract
Lab-on-a-chip technology has been developed to streamline biochemical experiments by providing experimental environments in microscopic areas. Due to the difficulty of mixing chemicals in such small channels, various micromixers have been created. Our proposed sidewall-driven micromixer offers easy fabrication and precise control over mixing concentrations. In our previous study, we successfully generated concentration gradients by simultaneously mixing multiple chambers using a single actuator. However, it is not possible to mix different chemicals in each chamber. In this study, we developed a sidewall-driven micromixer that enables independent mixing in each chamber by installing one actuator per chamber. Experimental results showed that different conditions were achieved in each chamber using both microbead-mixture water and colored water. Thus, this mixer can be used to manipulate concentrations regardless of whether the mixing targets are particles or fluids.
Collapse
|
2
|
El Moukhtari SH, Garbayo E, Amundarain A, Pascual-Gil S, Carrasco-León A, Prosper F, Agirre X, Blanco-Prieto MJ. Lipid nanoparticles for siRNA delivery in cancer treatment. J Control Release 2023; 361:130-146. [PMID: 37532145 DOI: 10.1016/j.jconrel.2023.07.054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 07/08/2023] [Accepted: 07/30/2023] [Indexed: 08/04/2023]
Abstract
RNA-based therapies, and siRNAs in particular, have attractive therapeutic potential for cancer treatment due to their ability to silence genes that are imperative for tumor progression. To be effective and solve issues related to their poor half-life and poor pharmacokinetic properties, siRNAs require adequate drug delivery systems that protect them from degradation and allow intracellular delivery. Among the various delivery vehicles available, lipid nanoparticles have emerged as the leading choice. These nanoparticles consist of cholesterol, phospholipids, PEG-lipids and most importantly ionizable cationic lipids. These ionizable lipids enable the binding of negatively charged siRNA, resulting in the formation of stable and neutral lipid nanoparticles with exceptionally high encapsulation efficiency. Lipid nanoparticles have demonstrated their effectiveness and versatility in delivering not only siRNAs but also multiple RNA molecules, contributing to their remarkable success. Furthermore, the advancement of efficient manufacturing techniques such as microfluidics, enables the rapid mixing of two miscible solvents without the need for shear forces. This facilitates the reproducible production of lipid nanoparticles and holds enormous potential for scalability. This is shown by the increasing number of preclinical and clinical trials evaluating the potential use of siRNA-LNPs for the treatment of solid and hematological tumors as well as in cancer immunotherapy. In this review, we provide an overview of the progress made on siRNA-LNP development for cancer treatment and outline the current preclinical and clinical landscape in this area. Finally, the translational challenges required to bring siRNA-LNPs further into the clinic are also discussed.
Collapse
Affiliation(s)
- Souhaila H El Moukhtari
- Department of Pharmaceutical Technology and Chemistry, School of Pharmacy and Nutrition, University of Navarra, C/Irunlarrea 1, 31008 Pamplona, Spain; Instituto de Investigación Sanitaria de Navarra, IdiSNA, C/Irunlarrea 3, 31008 Pamplona, Spain
| | - Elisa Garbayo
- Department of Pharmaceutical Technology and Chemistry, School of Pharmacy and Nutrition, University of Navarra, C/Irunlarrea 1, 31008 Pamplona, Spain; Instituto de Investigación Sanitaria de Navarra, IdiSNA, C/Irunlarrea 3, 31008 Pamplona, Spain
| | - Ane Amundarain
- Instituto de Investigación Sanitaria de Navarra, IdiSNA, C/Irunlarrea 3, 31008 Pamplona, Spain; Hemato-Oncology Program, Center for Applied Medical Research (CIMA), University of Navarra, Avenida Pío XII 55, 31008 Pamplona, Spain; Centro de Investigación Biomédica en Red Cáncer (CIBERONC), 28029, Madrid, Spain
| | - Simón Pascual-Gil
- Department of Pharmaceutical Technology and Chemistry, School of Pharmacy and Nutrition, University of Navarra, C/Irunlarrea 1, 31008 Pamplona, Spain; Instituto de Investigación Sanitaria de Navarra, IdiSNA, C/Irunlarrea 3, 31008 Pamplona, Spain
| | - Arantxa Carrasco-León
- Instituto de Investigación Sanitaria de Navarra, IdiSNA, C/Irunlarrea 3, 31008 Pamplona, Spain; Hemato-Oncology Program, Center for Applied Medical Research (CIMA), University of Navarra, Avenida Pío XII 55, 31008 Pamplona, Spain; Centro de Investigación Biomédica en Red Cáncer (CIBERONC), 28029, Madrid, Spain
| | - Felipe Prosper
- Instituto de Investigación Sanitaria de Navarra, IdiSNA, C/Irunlarrea 3, 31008 Pamplona, Spain; Hemato-Oncology Program, Center for Applied Medical Research (CIMA), University of Navarra, Avenida Pío XII 55, 31008 Pamplona, Spain; Centro de Investigación Biomédica en Red Cáncer (CIBERONC), 28029, Madrid, Spain; Departmento de Hematología and CCUN, Clínica Universidad de Navarra, University of Navarra, Avenida Pío XII 36, 31008 Pamplona, Spain
| | - Xabier Agirre
- Instituto de Investigación Sanitaria de Navarra, IdiSNA, C/Irunlarrea 3, 31008 Pamplona, Spain; Hemato-Oncology Program, Center for Applied Medical Research (CIMA), University of Navarra, Avenida Pío XII 55, 31008 Pamplona, Spain; Centro de Investigación Biomédica en Red Cáncer (CIBERONC), 28029, Madrid, Spain
| | - María J Blanco-Prieto
- Department of Pharmaceutical Technology and Chemistry, School of Pharmacy and Nutrition, University of Navarra, C/Irunlarrea 1, 31008 Pamplona, Spain; Instituto de Investigación Sanitaria de Navarra, IdiSNA, C/Irunlarrea 3, 31008 Pamplona, Spain.
| |
Collapse
|
3
|
Shi Y, Zeng M, Bai H, Meng S, Zhang C, Feng X, Zhang C, Wang K, Zhao W. Transition Routes of Electrokinetic Flow in a Divergent Microchannel with Bending Walls. MICROMACHINES 2023; 14:474. [PMID: 36838174 PMCID: PMC9962358 DOI: 10.3390/mi14020474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 02/14/2023] [Accepted: 02/16/2023] [Indexed: 06/18/2023]
Abstract
Electrokinetic flow can be generated as a highly coupled phenomenon among velocity fields, electric conductivity fields, and electric fields. It can exhibit different responses to AC electric fields in different frequency regimes, according to different instability/receptivity mechanisms. In this investigation, by both flow visualization and single-point laser-induced fluorescence (LIF) method, the response of AC electrokinetic flow and the transition routes towards chaos and turbulence have been experimentally investigated. It is found, when the AC frequency ff>30 Hz, the interface responds at both the neutral frequency of the basic flow and the AC frequency. However, when ff≥30 Hz, the interface responds only at the neutral frequency of the basic flow. Both periodic doubling and subcritical bifurcations have been observed in the transition of AC electrokinetic flow. We hope the current investigation can promote our current understanding of the ultrafast transition process of electrokinetic flow from laminar state to turbulence.
Collapse
|
4
|
Electro-thermal actuated micromixer with VU/VIU/VUVIU/VIUVU patterned microgrooves. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2022. [DOI: 10.1007/s43153-022-00293-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
5
|
Zhang X, Qian Z, Jiang M, Li W, Huang Y, Men Y. Design and High-Resolution Analysis of an Efficient Periodic Split-and-Recombination Microfluidic Mixer. MICROMACHINES 2022; 13:1720. [PMID: 36296073 PMCID: PMC9607611 DOI: 10.3390/mi13101720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 10/06/2022] [Accepted: 10/09/2022] [Indexed: 06/16/2023]
Abstract
We developed a highly efficient passive mixing device based on a split-and-recombine (SAR) configuration. This micromixer was constructed by simply bonding two identical microfluidic periodical open-trench patterns face to face. The structure parameters of periodical units were optimized through numerical simulation to facilitate the mixing efficiency. Despite the simplicity in design and fabrication, it provided rapid mixing performance in both experiment and simulation conditions. To better illustrate the mixing mechanism, we developed a novel scheme to achieve high-resolution confocal imaging of serial channel cross-sections to accurately characterize the mixing details and performance after each SAR cycle. Using fluorescent IgG as an indicator, nearly complete mixing was achieved using only four SAR cycles in an aqueous solution within a device's length of less than 10 mm for fluids with a Péclet number up to 8.7 × 104. Trajectory analysis revealed that each SAR cycle transforms the input fluids using three synergetic effects: rotation, combination, and stretching to increase the interfaces exponentially. Furthermore, we identified that the pressure gradients in the parallel plane of the curved channel induced vertical convection, which is believed to be the driving force underlying these effects to accelerate the mixing process.
Collapse
Affiliation(s)
- Xiannian Zhang
- School of Basic Medical Sciences, Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing 100069, China
| | - Zhenwei Qian
- School of Basic Medical Sciences, Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing 100069, China
| | - Mengcheng Jiang
- Biomedical Pioneering Innovation Center (BIOPIC), Peking-Tsinghua Center for Life Sciences, Beijing Advanced Innovation Center for Genomics (ICG), College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Wentao Li
- Biomedical Pioneering Innovation Center (BIOPIC), Peking-Tsinghua Center for Life Sciences, Beijing Advanced Innovation Center for Genomics (ICG), College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yanyi Huang
- Biomedical Pioneering Innovation Center (BIOPIC), Peking-Tsinghua Center for Life Sciences, Beijing Advanced Innovation Center for Genomics (ICG), College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yongfan Men
- Research Center for Biomedical Optics and Molecular Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| |
Collapse
|
6
|
Nan K, Shi Y, Zhao T, Tang X, Zhu Y, Wang K, Bai J, Zhao W. Mixing and Flow Transition in an Optimized Electrokinetic Turbulent Micromixer. Anal Chem 2022; 94:12231-12239. [PMID: 35999194 DOI: 10.1021/acs.analchem.2c02960] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
Micromixer is a key element in a lab on a chip for broad applications in the analysis and measurement of chemistry and engineering. Previous investigations reported that electrokinetic (EK) turbulence could be realized in a "Y" type micromixer with a cross-sectional dimension of 100 μm order. Although the ultrafast turbulent mixing can be generated at a bulk flow Reynolds number on the order of unity, the micromixer has not been optimized. In this investigation, we systematically investigated the influence of electric field intensity, AC frequency, electric conductivity ratio, and channel width at the entrance on the mixing effect and transition electric Rayleigh number in the "Y" type electrokinetic turbulent micromixer. It is found that the optimal mixing is realized in a 350 μm wide micromixer, under 100 kHz and 1.14 × 105 V/m AC electric field, with an electric conductivity ratio of 1:3000. Under these conditions, a degree of mixedness of 0.93 can be achieved at 84 μm from the entrance and 100 ms. A further investigation of the critical electric field and the critical electric Rayleigh number indicates that the most unstable condition of EK flow instability is inconsistent with that of the optimal mixing in EK turbulence. To predict the evolution of EK flow under high Raσ and guide the design of EK turbulent micromixers, it is necessary to apply a computational turbulence model instead of linear instability analysis.
Collapse
Affiliation(s)
- Keyi Nan
- State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwest University, Xi'an 710069, China
| | - Yanxia Shi
- State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwest University, Xi'an 710069, China
| | - Tianyun Zhao
- School of Automation, Northwestern Polytechnical University, Xi'an 710072, China
| | - Xiaowei Tang
- School of Automation, Northwestern Polytechnical University, Xi'an 710072, China
| | - Yueqiang Zhu
- State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwest University, Xi'an 710069, China
| | - Kaige Wang
- State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwest University, Xi'an 710069, China
| | - Jintao Bai
- State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwest University, Xi'an 710069, China
| | - Wei Zhao
- State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwest University, Xi'an 710069, China
| |
Collapse
|
7
|
Liu M, Li N, Cui S, Li G, Yang F. Biochemical Reaction Acceleration by Electrokinetic Mixing in a Microfluidic Chip. J Phys Chem Lett 2022; 13:5633-5637. [PMID: 35704845 DOI: 10.1021/acs.jpclett.2c01308] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In the past two decades, a large number of micromixers have been studied and reported to solve the low mass transfer in microchannels. However, there is still a lack of research on how much biochemical reaction efficiency or detection sensitivity can be improved by microfluidic rapid mixing. In this study, using our previously developed ultrafast microelectrokinetic turbulent (μEKT) mixing method, taking glucose oxidation reaction as the research object, we investigated the effect of increasing microfluidic mass transfer efficiency on the efficiency and sensitivity of biochemical reactions. The results showed that fast mixing could improve the enzymatic reaction efficiency by improving the mass transfer efficiency. Further detection of glucose in glucose solutions and blood samples showed that the fast mixing could significantly improve the sensitivity of detection. These results indicate that mixing enhancement can be a significant step of microfluidics-based applications such as POCT, liquid biopsy, food safety, and so on.
Collapse
Affiliation(s)
- Mingzhan Liu
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University, Changchun 130012, China
| | - Na Li
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University, Changchun 130012, China
| | - Shunyu Cui
- Department of Breast Surgery, Jilin Cancer Hospital, Changchun, Jilin 130012, China
| | - Guiying Li
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University, Changchun 130012, China
- National Engineering Laboratory for AIDS Vaccine, School of Life Sciences, Jilin University, Changchun 130012, China
| | - Fang Yang
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University, Changchun 130012, China
| |
Collapse
|
8
|
Kandalkar A, Pathak N, Kulkarni A, Morarka A. Active micromixer platform based on Lorentz force for lab-on-a-chip application. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:055005. [PMID: 35649768 DOI: 10.1063/5.0081151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 04/27/2022] [Indexed: 06/15/2023]
Abstract
Mixing in an active micromixer was achieved using Lorentz force-assisted actuation of an enameled copper wire. A single-step template-assisted soft lithography technique was used to construct the mixing chamber. The chamber had a volume of 1.86 µl. The application of a square wave alternating current in tandem with tension in the wire provided the necessary conditions for the resonant oscillation frequency of the wire. The repeatability of the ratio of higher harmonics to the fundamental frequencies of the oscillating wire conforms to standardization of the device fabrication, assembly, and functionality. Simulations and experiments were performed to validate uniform temperature distribution in the mixing chamber. Real-time optical detection of the sample assisted in sensing the completion of chemical reactions in the chamber. Mixing of various aqueous based chemical reactions was performed. It was found that mixing efficiency was greater than 95 percent. Multiple devices were fabricated to show the usability and reproducibility of the system.
Collapse
Affiliation(s)
- Aniket Kandalkar
- Institute of Bioinformatics and Biotechnology, Savitribai Phule Pune University, Ganeshkhind, Pune, Maharashtra 411007, India
| | - Nachiket Pathak
- Institute of Bioinformatics and Biotechnology, Savitribai Phule Pune University, Ganeshkhind, Pune, Maharashtra 411007, India
| | - Atharva Kulkarni
- Department of Electronics and Instrumentation Science, Savitribai Phule Pune University, Ganeshkhind, Pune, Maharashtra 411007, India
| | - Amit Morarka
- Department of Electronics and Instrumentation Science, Savitribai Phule Pune University, Ganeshkhind, Pune, Maharashtra 411007, India
| |
Collapse
|
9
|
Renner J, Schmidt M, Heras DDL. Shear and Bulk Acceleration Viscosities in Simple Fluids. PHYSICAL REVIEW LETTERS 2022; 128:094502. [PMID: 35302832 DOI: 10.1103/physrevlett.128.094502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Accepted: 02/09/2022] [Indexed: 06/14/2023]
Abstract
Inhomogeneities in the velocity field of a moving fluid are dampened by the inherent viscous behavior of the system. Both bulk and shear effects, related to the divergence and the curl of the velocity field, are relevant. On molecular time scales, beyond the Navier-Stokes description, memory plays an important role. Using molecular and overdamped Brownian dynamics many-body simulations, we demonstrate that analogous viscous effects act on the acceleration field. This acceleration viscous behavior is associated with the divergence and the curl of the acceleration field, and it can be quantitatively described using simple exponentially decaying memory kernels. The simultaneous use of velocity and acceleration fields enables the description of fast dynamics on molecular scales.
Collapse
Affiliation(s)
- Johannes Renner
- Theoretische Physik II, Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth, Germany
| | - Matthias Schmidt
- Theoretische Physik II, Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth, Germany
| | - Daniel de Las Heras
- Theoretische Physik II, Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth, Germany
| |
Collapse
|
10
|
Ficai D, Gheorghe M, Dolete G, Mihailescu B, Svasta P, Ficai A, Constantinescu G, Andronescu E. Microelectromechanical Systems Based on Magnetic Polymer Films. MICROMACHINES 2022; 13:mi13030351. [PMID: 35334643 PMCID: PMC8952241 DOI: 10.3390/mi13030351] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Revised: 02/18/2022] [Accepted: 02/21/2022] [Indexed: 02/04/2023]
Abstract
Microelectromechanical systems (MEMS) have been increasingly used worldwide in a wide range of applications, including high tech, energy, medicine or environmental applications. Magnetic polymer composite films have been used extensively in the development of the micropumps and valves, which are critical components of the microelectromechanical systems. Based on the literature survey, several polymers and magnetic micro and nanopowders can be identified and, depending on their nature, ratio, processing route and the design of the device, their performances can be tuned from simple valves and pumps to biomimetic devices, such as, for instance, hearth ventricles. In many such devices, polymer magnetic films are used, the disposal of the magnetic component being either embedded into the polymer or coated on the polymer. One or more actuation zones can be used and the flow rate can be mono-directional or bi-directional depending on the design. In this paper, we review the main advances in the development of these magnetic polymer films and derived MEMS: microvalve, micropump, micromixer, microsensor, drug delivery micro-systems, magnetic labeling and separation microsystems, etc. It is important to mention that these MEMS are continuously improving from the point of view of performances, energy consumption and actuation mechanism and a clear tendency in developing personalized treatment. Due to the improved energy efficiency of special materials, wearable devices are developed and be suitable for medical applications.
Collapse
Affiliation(s)
- Denisa Ficai
- Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Gh. Polizu 1-7, 011061 Bucharest, Romania;
- National Research Center for Food Safety, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania; (G.D.); (E.A.)
- National Center for Micro and Nanomaterials, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
| | - Marin Gheorghe
- Center for Technological Electronics and Interconnection Techniques, University Politehnica of Bucharest, Bulevardul Iuliu Maniu, 061071 Bucharest, Romania; (M.G.); (B.M.); (P.S.)
- NANOM—MEMS, George Cosbuc 9, 505400 Rasnov, Romania
| | - Georgiana Dolete
- National Research Center for Food Safety, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania; (G.D.); (E.A.)
- National Center for Micro and Nanomaterials, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
| | - Bogdan Mihailescu
- Center for Technological Electronics and Interconnection Techniques, University Politehnica of Bucharest, Bulevardul Iuliu Maniu, 061071 Bucharest, Romania; (M.G.); (B.M.); (P.S.)
| | - Paul Svasta
- Center for Technological Electronics and Interconnection Techniques, University Politehnica of Bucharest, Bulevardul Iuliu Maniu, 061071 Bucharest, Romania; (M.G.); (B.M.); (P.S.)
| | - Anton Ficai
- National Research Center for Food Safety, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania; (G.D.); (E.A.)
- National Center for Micro and Nanomaterials, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
- Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Gh. Polizu 1-7, 011061 Bucharest, Romania
- Academy of Romanian Scientists, Ilfov Street 3, 050044 Bucharest, Romania
- Correspondence:
| | - Gabriel Constantinescu
- Department of Gastroenterology, Clinical Emergency Hospital of Bucharest, Carol Davila University of Medicine and Pharmacy, Bulevardul Eroii Sanitari 8, 050474 Bucharest, Romania;
| | - Ecaterina Andronescu
- National Research Center for Food Safety, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania; (G.D.); (E.A.)
- National Center for Micro and Nanomaterials, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
- Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Gh. Polizu 1-7, 011061 Bucharest, Romania
- Academy of Romanian Scientists, Ilfov Street 3, 050044 Bucharest, Romania
| |
Collapse
|
11
|
|
12
|
Yang F, Zhao W, Kuang C, Wang G. Rapid AC Electrokinetic Micromixer with Electrically Conductive Sidewalls. MICROMACHINES 2021; 13:mi13010034. [PMID: 35056199 PMCID: PMC8777699 DOI: 10.3390/mi13010034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 12/20/2021] [Accepted: 12/23/2021] [Indexed: 12/03/2022]
Abstract
We report a quasi T-channel electrokinetics-based micromixer with electrically conductive sidewalls, where the electric field is in the transverse direction of the flow and parallel to the conductivity gradient at the interface between two fluids to be mixed. Mixing results are first compared with another widely studied micromixer configuration, where electrodes are located at the inlet and outlet of the channel with electric field parallel to bulk flow direction but orthogonal to the conductivity gradient at the interface between the two fluids to be mixed. Faster mixing is achieved in the micromixer with conductive sidewalls. Effects of Re numbers, applied AC voltage and frequency, and conductivity ratio of the two fluids to be mixed on mixing results were investigated. The results reveal that the mixing length becomes shorter with low Re number and mixing with increased voltage and decreased frequency. Higher conductivity ratio leads to stronger mixing result. It was also found that, under low conductivity ratio, compared with the case where electrodes are located at the end of the channel, the conductive sidewalls can generate fast mixing at much lower voltage, higher frequency, and lower conductivity ratio. The study of this micromixer could broaden our understanding of electrokinetic phenomena and provide new tools for sample preparation in applications such as organ-on-a-chip where fast mixing is required.
Collapse
Affiliation(s)
- Fang Yang
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University, Changchun 130012, China
- Correspondence: (F.Y.); (G.W.)
| | - Wei Zhao
- State Key Laboratory of Photon-Technology in Western China Energy, International Scientific and Technological Cooperation Base of Photoelectric Technology and Functional Materials and Application, Institute of Photonics and Photon-Technology, Northwest University, Xi’an 710127, China;
| | - Cuifang Kuang
- State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China;
| | - Guiren Wang
- State Key Laboratory of Photon-Technology in Western China Energy, International Scientific and Technological Cooperation Base of Photoelectric Technology and Functional Materials and Application, Institute of Photonics and Photon-Technology, Northwest University, Xi’an 710127, China;
- Department of Mechanical Engineering and Biomedical Engineering Program, University of South Carolina, Columbia, SC 29208, USA
- Correspondence: (F.Y.); (G.W.)
| |
Collapse
|
13
|
Numerical Simulation of the Photobleaching Process in Laser-Induced Fluorescence Photobleaching Anemometer. MICROMACHINES 2021; 12:mi12121592. [PMID: 34945442 PMCID: PMC8708141 DOI: 10.3390/mi12121592] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 12/08/2021] [Accepted: 12/17/2021] [Indexed: 01/30/2023]
Abstract
At present, a novel flow diagnostic technique for micro/nanofluidics velocity measurement-laser-induced fluorescence photobleaching anemometer (LIFPA)-has been developed and successfully applied in broad areas, e.g., electrokinetic turbulence in micromixers and AC electroosmotic flow. Nevertheless, in previous investigations, to qualitatively reveal the dynamics of the photobleaching process of LIFPA, an approximation of uniform laser distribution was applied. This is different from the actual condition where the laser power density distribution is normally Gaussian. In this investigation, we numerically studied the photobleaching process of fluorescent dye in the laser focus region, according to the convection-diffusion reaction equation. The profiles of effective dye concentration and fluorescence were elucidated. The relationship between the commonly used photobleaching time constant obtained by experiments and the photochemical reaction coefficient is revealed. With the established model, we further discuss the effective spatial resolution of LIFPA and study the influence of the detection region of fluorescence on the performance of the LIFPA system. It is found that at sufficiently high excitation laser power density, LIFPA can even achieve a super-resolution that breaks the limit of optical diffraction. We hope the current investigation can reveal the photobleaching process of fluorescent dye under high laser power density illumination, to enhance our understanding of fluorescent dynamics and photochemistry and develop more powerful photobleaching-related flow diagnostic techniques.
Collapse
|
14
|
Logesh D, Vallikkadan MS, Leena MM, Moses J, Anandharamakrishnan C. Advances in microfluidic systems for the delivery of nutraceutical ingredients. Trends Food Sci Technol 2021. [DOI: 10.1016/j.tifs.2021.07.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
15
|
Firmino PCOS, Vianna SSV, da Costa OMMM, Malfatti-Gasperini AA, Gobbi AL, Lima RS, de la Torre LG. 3D micromixer for nanoliposome synthesis: a promising advance in high mass productivity. LAB ON A CHIP 2021; 21:2971-2985. [PMID: 34137409 DOI: 10.1039/d1lc00232e] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
This paper addresses an important breakthrough in the high mass production of liposomes by microfluidics technology. We investigated the synthesis of liposomes using a high flow rate microfluidic device (HFR-MD) with a 3D-twisted cross-sectional microchannel to favor chaotic advection. A simple construction scaffold technique was used to manufacture the HFR-MD. The synthesis of liposomes combined the effects of high flow and high concentration of lipids, resulting in high mass productivity (2.27 g of lipid per h) which, to our knowledge, has never been registered by only one microdevice. We assessed the effects of the flow rate ratio (FRR), total flow rate (TFR), and lipid concentration on the liposome physicochemical properties. HFR-MD liposomes were monodisperse (0.074) with a size around 100 nm under the condition of an FRR of 1 (50% v/v ethanol) and TFR of 5 ml min-1 (expandable to 10 ml min-1). We demonstrated that the mixing conditions are not the only parameter controlling liposome synthesis using experimental and computational fluid dynamics analysis. A vacuum concentrator was used for ethanol removal, and there is no further modification after processing in accordance with the structural (SAXS) and morphological (cryo-TEM) analysis. Hence, the HFR-MD can be used to prepare nanoliposomes. It emerges as an innovative tool with high mass production.
Collapse
Affiliation(s)
- Priscilla C O S Firmino
- Department of Materials and Bioprocess Engineering, School of Chemical Engineering, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil.
| | - Sávio S V Vianna
- Department of Chemical Systems Engineering, School of Chemical Engineering, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil
| | - Ohanna M M M da Costa
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Zip Code 13083-970, Campinas, São Paulo, Brazil
| | - Antônio A Malfatti-Gasperini
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Zip Code 13083-970, Campinas, São Paulo, Brazil
| | - Angelo L Gobbi
- Brazilian Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), Zip Code 13083-970, Campinas, São Paulo, Brazil
| | - Renato S Lima
- Brazilian Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), Zip Code 13083-970, Campinas, São Paulo, Brazil and Institute of Chemistry, University of Campinas (UNICAMP), Zip Code 13083-970, Campinas, São Paulo, Brazil and São Carlos Institute of Chemistry, University of São Paulo, Zip Code 09210-580, São Carlos, São Paulo, Brazil and Federal University of ABC, Santo André, Zip Code 09210-580, São Paulo, São Paulo, Brazil
| | - Lucimara G de la Torre
- Department of Materials and Bioprocess Engineering, School of Chemical Engineering, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil.
| |
Collapse
|
16
|
Prakash P, Abdulla AZ, Varma M. Contact Force Mediated Rapid Deposition of Colloidal Microspheres Flowing over Microstructured Barriers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:6915-6922. [PMID: 34076447 DOI: 10.1021/acs.langmuir.1c00370] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Deposition of particles while flowing past constrictions is a ubiquitous phenomenon observed in diverse systems. Some common examples are jamming of salt crystals near the orifice of salt shakers, clogging of filter systems, gridlock in vehicular traffic, etc. Our work investigates the deposition events of colloidal microspheres flowing over microstructured barriers in microfluidic devices. The interplay of DLVO, contact, and hydrodynamic forces in facilitating rapid deposition of microspheres is discussed. Noticeably, a decrease in the electrostatic repulsion among microspheres leads to linear chain formations, whereas an increase in roughness results in rapid deposition.
Collapse
Affiliation(s)
- P Prakash
- Centre for Nanoscience and Engineering, Indian Institute of Science, Bangalore 560012, India
| | - A Z Abdulla
- Department of Physics, Indian Institute of Science, Bangalore 560012, India
| | - M Varma
- Centre for Nanoscience and Engineering, Indian Institute of Science, Bangalore 560012, India
- Robert Bosch Centre for Cyber Physical Systems, Indian Institute of Science, Bangalore 560012, India
| |
Collapse
|
17
|
Portable microfluidic devices for in-field detection of pharmaceutical residues in water: Recent outcomes and current technological situation – A short review. CASE STUDIES IN CHEMICAL AND ENVIRONMENTAL ENGINEERING 2021. [DOI: 10.1016/j.cscee.2020.100069] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
|
18
|
Ghorbani Kharaji Z, Bayareh M, Kalantar V. A review on acoustic field-driven micromixers. INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING 2021. [DOI: 10.1515/ijcre-2020-0188] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
A review on acoustic field-driven micromixers is given. This is supplemented by the governing equations, governing non-dimensional parameters, numerical simulation approaches, and fabrication techniques. Acoustically induced vibration is a kind of external energy input employed in active micromixers to improve the mixing performance. An air bubble energized by an acoustic field acts as an external energy source and induces friction forces at the interface between an air bubble and liquid, leading to the formation of circulatory flows. The current review (with 200 references) evaluates different characteristics of microfluidic devices working based on acoustic field shaking.
Collapse
Affiliation(s)
| | - Morteza Bayareh
- Department of Mechanical Engineering , Shahrekord University , Shahrekord , Iran
| | - Vali Kalantar
- Department of Mechanical Engineering , Yazd University , Yazd , Iran
| |
Collapse
|
19
|
Advances in microfluidic synthesis and coupling with synchrotron SAXS for continuous production and real-time structural characterization of nano-self-assemblies. Colloids Surf B Biointerfaces 2021; 201:111633. [PMID: 33639513 DOI: 10.1016/j.colsurfb.2021.111633] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 02/03/2021] [Accepted: 02/15/2021] [Indexed: 02/06/2023]
Abstract
Microfluidic platforms have become highly attractive tools for synthesis of nanoparticles, including lipid nano-self-assemblies, owing to unique features and at least three important aspects inherent to miniaturized micro-devices. Firstly, the fluids flow under controlled conditions in the microchannels, providing well-defined flow profiles and shorter diffusion lengths that play important roles in enhancing the continuous production of lipid and polymer nanoparticles with relatively narrow size distributions. Secondly, various geometries adapted to microfluidic device designs can be utilized for enhancing the colloidal stability of nanoparticles and improving their drug loading. Thirdly, microfluidic devices are usually compatible with in situ characterization methods for real-time monitoring of processes occurring inside the microchannels. This is unlike conventional nanoparticle synthesis methods, where a final solution or withdrawn aliquots are separately analysed. These features inherent to microfluidic devices provide a tool-set allowing not only precise nanoparticle size control, but also real-time analyses for process optimization. In this review, we focus on recent advances and developments in the use of microfluidic devices for synthesis of lipid nanoparticles. We present different designs based on hydrodynamic flow focusing, droplet-based methods and controlled microvortices, and discuss integration of microfluidic platforms with synchrotron small-angle X ray scattering (SAXS) for in situ structural characterization of lipid nano-self-assemblies under continuous flow conditions, along with major challenges and future directions in this research area.
Collapse
|
20
|
Hu Z, Zhao T, Zhao W, Yang F, Wang H, Wang K, Bai J, Wang G. Transition from periodic to chaotic
AC
electroosmotic flows near electric double layer. AIChE J 2021. [DOI: 10.1002/aic.17148] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Zhongyan Hu
- State Key Laboratory of Photon‐Technology in Western China Energy, International Scientific and Technological Cooperation Base of Photoelectric Technology and Functional Materials and Application, Institute of Photonics and Photon‐Technology Northwest University Xi'an 710127 China
| | - Tianyun Zhao
- School of Automation Northwestern Polytechnical University Xi'an China
| | - Wei Zhao
- State Key Laboratory of Photon‐Technology in Western China Energy, International Scientific and Technological Cooperation Base of Photoelectric Technology and Functional Materials and Application, Institute of Photonics and Photon‐Technology Northwest University Xi'an 710127 China
- Department of Mechanical Engineering & Biomedical Engineering Program University of South Carolina Columbia South Carolina USA
| | - Fang Yang
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education Jilin University Changchun P.R. China
| | - Hongxun Wang
- Aeronautics Engineering College Air Force Engineering University Xi'an China
| | - Kaige Wang
- State Key Laboratory of Photon‐Technology in Western China Energy, International Scientific and Technological Cooperation Base of Photoelectric Technology and Functional Materials and Application, Institute of Photonics and Photon‐Technology Northwest University Xi'an 710127 China
| | - Jintao Bai
- State Key Laboratory of Photon‐Technology in Western China Energy, International Scientific and Technological Cooperation Base of Photoelectric Technology and Functional Materials and Application, Institute of Photonics and Photon‐Technology Northwest University Xi'an 710127 China
| | - Guiren Wang
- State Key Laboratory of Photon‐Technology in Western China Energy, International Scientific and Technological Cooperation Base of Photoelectric Technology and Functional Materials and Application, Institute of Photonics and Photon‐Technology Northwest University Xi'an 710127 China
- Department of Mechanical Engineering & Biomedical Engineering Program University of South Carolina Columbia South Carolina USA
| |
Collapse
|
21
|
Nan K, Hu Z, Zhao W, Wang K, Bai J, Wang G. Large-Scale Flow in Micro Electrokinetic Turbulent Mixer. MICROMACHINES 2020; 11:mi11090813. [PMID: 32872223 PMCID: PMC7570105 DOI: 10.3390/mi11090813] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 08/25/2020] [Accepted: 08/26/2020] [Indexed: 11/16/2022]
Abstract
In the present work, we studied the three-dimensional (3D) mean flow field in a micro electrokinetic (μEK) turbulence based micromixer by micro particle imaging velocimetry (μPIV) with stereoscopic method. A large-scale solenoid-type 3D mean flow field has been observed. The extraordinarily fast mixing process of the μEK turbulent mixer can be primarily attributed to two steps. First, under the strong velocity fluctuations generated by μEK mechanism, the two fluids with different conductivity are highly mixed near the entrance, primarily at the low electric conductivity sides and bias to the bottom wall. Then, the well-mixed fluid in the local region convects to the rest regions of the micromixer by the large-scale solenoid-type 3D mean flow. The mechanism of the large-scale 3D mean flow could be attributed to the unbalanced electroosmotic flows (EOFs) due to the high and low electric conductivity on both the bottom and top surface.
Collapse
Affiliation(s)
- Keyi Nan
- State Key Laboratory of Photoelectric Technology and Functional Materials, International Scientific and Technological Cooperation Base of Photoelectric Technology and Functional Materials and Application, Institute of Photonics and Photon-technology, Northwest University, Xi’an 710069, China; (K.N.); (Z.H.); (K.W.); (J.B.)
| | - Zhongyan Hu
- State Key Laboratory of Photoelectric Technology and Functional Materials, International Scientific and Technological Cooperation Base of Photoelectric Technology and Functional Materials and Application, Institute of Photonics and Photon-technology, Northwest University, Xi’an 710069, China; (K.N.); (Z.H.); (K.W.); (J.B.)
| | - Wei Zhao
- State Key Laboratory of Photoelectric Technology and Functional Materials, International Scientific and Technological Cooperation Base of Photoelectric Technology and Functional Materials and Application, Institute of Photonics and Photon-technology, Northwest University, Xi’an 710069, China; (K.N.); (Z.H.); (K.W.); (J.B.)
- Correspondence: (W.Z.); (G.W.)
| | - Kaige Wang
- State Key Laboratory of Photoelectric Technology and Functional Materials, International Scientific and Technological Cooperation Base of Photoelectric Technology and Functional Materials and Application, Institute of Photonics and Photon-technology, Northwest University, Xi’an 710069, China; (K.N.); (Z.H.); (K.W.); (J.B.)
| | - Jintao Bai
- State Key Laboratory of Photoelectric Technology and Functional Materials, International Scientific and Technological Cooperation Base of Photoelectric Technology and Functional Materials and Application, Institute of Photonics and Photon-technology, Northwest University, Xi’an 710069, China; (K.N.); (Z.H.); (K.W.); (J.B.)
| | - Guiren Wang
- Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USA
- Biomedical Engineering Program, University of South Carolina, Columbia, SC 29208, USA
- Correspondence: (W.Z.); (G.W.)
| |
Collapse
|
22
|
Microfluidic-assisted polymer-protein assembly to fabricate homogeneous functionalnanoparticles. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 111:110768. [DOI: 10.1016/j.msec.2020.110768] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 01/29/2020] [Accepted: 02/21/2020] [Indexed: 12/11/2022]
|
23
|
Ahmad B, Maeda H, Kawahara T. Dynamic Response of Swimming Paramecium Induced by Local Stimulation Using a Threadlike-Microtool. IEEE Robot Autom Lett 2020. [DOI: 10.1109/lra.2020.2972848] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
|
24
|
Liu Z, Fontana F, Python A, Hirvonen JT, Santos HA. Microfluidics for Production of Particles: Mechanism, Methodology, and Applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e1904673. [PMID: 31702878 DOI: 10.1002/smll.201904673] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 09/27/2019] [Indexed: 06/10/2023]
Abstract
In the past two decades, microfluidics-based particle production is widely applied for multiple biological usages. Compared to conventional bulk methods, microfluidic-assisted particle production shows significant advantages, such as narrower particle size distribution, higher reproducibility, improved encapsulation efficiency, and enhanced scaling-up potency. Herein, an overview of the recent progress of the microfluidics technology for nano-, microparticles or droplet fabrication, and their biological applications is provided. For both nano-, microparticles/droplets, the previously established mechanisms behind particle production via microfluidics and some typical examples during the past five years are discussed. The emerging interdisciplinary technologies based on microfluidics that have produced microparticles or droplets for cellular analysis and artificial cells fabrication are summarized. The potential drawbacks and future perspectives are also briefly discussed.
Collapse
Affiliation(s)
- Zehua Liu
- Drug Research Program, Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, FI-00014, Helsinki, Finland
| | - Flavia Fontana
- Drug Research Program, Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, FI-00014, Helsinki, Finland
| | - Andre Python
- Nuffield Department of Medicine, Li Ka Shing Centre for Health Information and Discovery, Big Data Institute, University of Oxford, OX3 7LF, Oxford, UK
| | - Jouni T Hirvonen
- Drug Research Program, Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, FI-00014, Helsinki, Finland
| | - Hélder A Santos
- Drug Research Program, Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, FI-00014, Helsinki, Finland
- Helsinki Institute of Life Science (HiLIFE), University of Helsinki, FI-00014, Helsinki, Finland
| |
Collapse
|
25
|
Seo S, Lages B, Kim M. Catalytic CO2 absorption in an amine solvent using nickel nanoparticles for post-combustion carbon capture. J CO2 UTIL 2020. [DOI: 10.1016/j.jcou.2019.11.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
|
26
|
Song L, Yu L, Li D, Jagdale PP, Xuan X. Elastic instabilities in the electroosmotic flow of non‐Newtonian fluids through T‐shaped microchannels. Electrophoresis 2019; 41:588-597. [DOI: 10.1002/elps.201900331] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 11/26/2019] [Accepted: 11/26/2019] [Indexed: 12/22/2022]
Affiliation(s)
- Le Song
- School of Instrument Science and Opto‐electronic Engineering Hefei University of Technology Hefei P. R. China
- Department of Mechanical Engineering Clemson University Clemson SC USA
| | - Liandong Yu
- School of Instrument Science and Opto‐electronic Engineering Hefei University of Technology Hefei P. R. China
| | - Di Li
- Department of Mechanical Engineering Clemson University Clemson SC USA
| | - Purva P. Jagdale
- Department of Mechanical Engineering Clemson University Clemson SC USA
| | - Xiangchun Xuan
- Department of Mechanical Engineering Clemson University Clemson SC USA
| |
Collapse
|
27
|
Bonat Celli G, Abbaspourrad A. Tailoring Delivery System Functionality Using Microfluidics. Annu Rev Food Sci Technol 2018; 9:481-501. [DOI: 10.1146/annurev-food-030117-012545] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
28
|
Zhao W, Liu X, Yang F, Wang K, Bai J, Qiao R, Wang G. Study of Oscillating Electroosmotic Flows with High Temporal and Spatial Resolution. Anal Chem 2018; 90:1652-1659. [PMID: 29256244 DOI: 10.1021/acs.analchem.7b02985] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Near-wall velocity of oscillating electroosmotic flow (OEOF) driven by an AC electric field has been investigated using a laser-induced fluorescence photobleaching anemometer (LIFPA). For the first time, an up to 3 kHz velocity response of OEOF has been successfully measured experimentally, even though the oscillating velocity is as low as 600 nm/s. It is found that the oscillating velocity decays with the forcing frequency ff as ff-0.66. In the investigated range of electric field intensity (EA), below 1 kHz, the linear relation between oscillating velocity and EA is also observed. Because the oscillating velocity at high frequency is very small, the contribution of noise to velocity measurement is significant, and it is discussed in this manuscript. The investigation reveals the instantaneous response of OEOF to the temporal change of electric fields, which exists in almost all AC electrokinetic flows. Furthermore, the experimental observations are important for designing OEOF-based micro/nanofluidics systems.
Collapse
Affiliation(s)
- Wei Zhao
- Institute of Photonics and Photon-technology, International Scientific and Technological Cooperation Base of Photoelectric Technology and Functional Materials and Application, Northwest University , 229 North Taibai Road, Xi'an 710069, People's Republic of China.,Department of Mechanical Engineering & Biomedical Engineering Program, University of South Carolina , Columbia, South Carolina 29208, United States
| | - Xin Liu
- Department of Mechanical Engineering & Biomedical Engineering Program, University of South Carolina , Columbia, South Carolina 29208, United States
| | - Fang Yang
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, Jilin University , Changchun 130012, People's Republic of China
| | - Kaige Wang
- Institute of Photonics and Photon-technology, International Scientific and Technological Cooperation Base of Photoelectric Technology and Functional Materials and Application, Northwest University , 229 North Taibai Road, Xi'an 710069, People's Republic of China
| | - Jintao Bai
- Institute of Photonics and Photon-technology, International Scientific and Technological Cooperation Base of Photoelectric Technology and Functional Materials and Application, Northwest University , 229 North Taibai Road, Xi'an 710069, People's Republic of China
| | - Rui Qiao
- Department of Mechanical Engineering, Virginia Tech , Blacksburg, Virginia 24061, United States
| | - Guiren Wang
- Department of Mechanical Engineering & Biomedical Engineering Program, University of South Carolina , Columbia, South Carolina 29208, United States
| |
Collapse
|
29
|
DeLaney K, Buchberger A, Li L. Identification, Quantitation, and Imaging of the Crustacean Peptidome. Methods Mol Biol 2018; 1719:247-269. [PMID: 29476517 DOI: 10.1007/978-1-4939-7537-2_17] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Crustaceans serve as a useful, simplified model for studying peptides and neuromodulation, as they contain numerous neuropeptide homologs to mammals and enable electrophysiological studies at the single-cell and neural circuit levels. In particular, crustaceans contain well-defined neural networks, including the stomatogastric ganglion, esophageal ganglion, commissural ganglia, and several neuropeptide-rich organs, such as the brain, pericardial organs, and sinus glands. Due to the lack of a genomic database for crustacean peptides, an important step of crustacean peptidomics involves the discovery and identification of novel peptides and the construction of a database, more recently with the aid of mass spectrometry (MS). Herein, we present a general workflow and detailed methods for MS-based peptidomic analysis of crustacean tissue samples and circulating fluids. In conjunction with profiling, quantitation can also be performed with isotopic or isobaric labeling. Information regarding the localization patterns and changes of peptides can be studied via mass spectrometry imaging. Combining these sample preparation strategies and MS analytical techniques allows for a multifaceted approach to obtaining deep knowledge of crustacean peptidergic signaling pathways.
Collapse
Affiliation(s)
- Kellen DeLaney
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, USA
| | - Amanda Buchberger
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, USA
| | - Lingjun Li
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, USA. .,School of Pharmacy, University of Wisconsin-Madison, Madison, WI, USA.
| |
Collapse
|
30
|
Cai G, Xue L, Zhang H, Lin J. A Review on Micromixers. MICROMACHINES 2017; 8:E274. [PMID: 30400464 PMCID: PMC6189760 DOI: 10.3390/mi8090274] [Citation(s) in RCA: 176] [Impact Index Per Article: 25.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Revised: 08/30/2017] [Accepted: 09/01/2017] [Indexed: 01/23/2023]
Abstract
Microfluidic devices have attracted increasing attention in the fields of biomedical diagnostics, food safety control, environmental protection, and animal epidemic prevention. Micromixing has a considerable impact on the efficiency and sensitivity of microfluidic devices. This work reviews recent advances on the passive and active micromixers for the development of various microfluidic chips. Recently reported active micromixers driven by pressure fields, electrical fields, sound fields, magnetic fields, and thermal fields, etc. and passive micromixers, which owned two-dimensional obstacles, unbalanced collisions, spiral and convergence-divergence structures or three-dimensional lamination and spiral structures, were summarized and discussed. The future trends for micromixers to combine with 3D printing and paper channel were brought forth as well.
Collapse
Affiliation(s)
- Gaozhe Cai
- Key Laboratory of Agricultural Information Acquisition Technology (Beijing) of Ministry of Agriculture, China Agricultural University, 17 East Qinghua Road, Beijing 100083, China.
| | - Li Xue
- Key Laboratory of Agricultural Information Acquisition Technology (Beijing) of Ministry of Agriculture, China Agricultural University, 17 East Qinghua Road, Beijing 100083, China.
| | - Huilin Zhang
- Key Laboratory of Agricultural Information Acquisition Technology (Beijing) of Ministry of Agriculture, China Agricultural University, 17 East Qinghua Road, Beijing 100083, China.
| | - Jianhan Lin
- Modern Precision Agriculture System Integration Research Key Laboratory of Ministry of Education, China Agricultural University, 17 East Qinghua Road, Beijing 100083, China.
| |
Collapse
|
31
|
Zhao W, Yang F, Wang K, Bai J, Wang G. Rapid mixing by turbulent-like electrokinetic microflow. Chem Eng Sci 2017. [DOI: 10.1016/j.ces.2017.02.027] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
32
|
Song L, Yu L, Zhou Y, Antao AR, Prabhakaran RA, Xuan X. Electrokinetic instability in microchannel ferrofluid/water co-flows. Sci Rep 2017; 7:46510. [PMID: 28406228 PMCID: PMC5390253 DOI: 10.1038/srep46510] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 03/17/2017] [Indexed: 12/30/2022] Open
Abstract
Electrokinetic instability refers to unstable electric field-driven disturbance to fluid flows, which can be harnessed to promote mixing for various electrokinetic microfluidic applications. This work presents a combined numerical and experimental study of electrokinetic ferrofluid/water co-flows in microchannels of various depths. Instability waves are observed at the ferrofluid and water interface when the applied DC electric field is beyond a threshold value. They are generated by the electric body force that acts on the free charge induced by the mismatch of ferrofluid and water electric conductivities. A nonlinear depth-averaged numerical model is developed to understand and simulate the interfacial electrokinetic behaviors. It considers the top and bottom channel walls’ stabilizing effects on electrokinetic flow through the depth averaging of three-dimensional transport equations in a second-order asymptotic analysis. This model is found accurate to predict both the observed electrokinetic instability patterns and the measured threshold electric fields for ferrofluids of different concentrations in shallow microchannels.
Collapse
Affiliation(s)
- Le Song
- School of Instrument Science and Opto-electronic Engineering, Hefei University of Technology, Hefei 230009, China
| | - Liandong Yu
- School of Instrument Science and Opto-electronic Engineering, Hefei University of Technology, Hefei 230009, China
| | - Yilong Zhou
- Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921, USA
| | - Asher Reginald Antao
- Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921, USA
| | | | - Xiangchun Xuan
- Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921, USA
| |
Collapse
|
33
|
Zhao W, Wang G. Scaling of velocity and scalar structure functions in ac electrokinetic turbulence. Phys Rev E 2017; 95:023111. [PMID: 28297919 DOI: 10.1103/physreve.95.023111] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2015] [Indexed: 11/07/2022]
Abstract
Electrokinetic (EK) turbulence or electrohydrodynamic (EHD) turbulence has been recently achieved in different fluids under both ac [G. Wang et al., Lab Chip 14, 1452 (2014)10.1039/C3LC51403J; Phys. Rev. E 93, 013106 (2016)10.1103/PhysRevE.93.013106] and dc electric fields [A. Varshney et al., Soft Matter 12, 1759 (2016)10.1039/C5SM02316E]. Here, through dimensional analysis, scaling laws of both velocity and electric conductivity structure functions in the forced cascade region of ac EK turbulence can be predicated (similar to Bolgiano-Obukhov scaling law in turbulent Rayleigh-Bénard convection), in either macroscale or microscale flows. In the forced cascade region, EK force, which relies on the direct cascade of conductivity structures, injects energy directly into a wide spectral region to sustain the flow disturbance. The scaling exponents of the second-order velocity and conductivity structures are 2/5 and 4/5, respectively. In addition to the scaling regions, two characteristic small length scales are derived for both weak and strong electric body forces, respectively. This theoretical investigation can significantly enhance our understanding of EK or EHD turbulence while forced by an ac electric field. It can further broaden our understanding of the forced cascade region of forced turbulence and make the manipulation of the turbulent cascade process more flexible and controllable.
Collapse
Affiliation(s)
- Wei Zhao
- Institute of Photonics and Photon-technology, International Scientific and Technological Cooperation Base of Photoelectric Technology and Functional Materials and Application, Northwest University, 229 North Taibai Road, Xi'an 710069, People's Republic of China.,Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina 29208, USA
| | - Guiren Wang
- Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina 29208, USA.,College of Biomedical Engineering, University of South Carolina, Columbia, South Carolina 29208, USA
| |
Collapse
|
34
|
Du K, Cai H, Park M, Wall TA, Stott MA, Alfson KJ, Griffiths A, Carrion R, Patterson JL, Hawkins AR, Schmidt H, Mathies RA. Multiplexed efficient on-chip sample preparation and sensitive amplification-free detection of Ebola virus. Biosens Bioelectron 2017; 91:489-496. [PMID: 28073029 DOI: 10.1016/j.bios.2016.12.071] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 12/26/2016] [Accepted: 12/30/2016] [Indexed: 12/23/2022]
Abstract
An automated microfluidic sample preparation multiplexer (SPM) has been developed and evaluated for Ebola virus detection. Metered air bubbles controlled by microvalves are used to improve bead-solution mixing thereby enhancing the hybridization of the target Ebola virus RNA with capture probes bound to the beads. The method uses thermally stable 4-formyl benzamide functionalized (4FB) magnetic beads rather than streptavidin coated beads with a high density of capture probes to improve the target capture efficiency. Exploiting an on-chip concentration protocol in the SPM and the single molecule detection capability of the antiresonant reflecting optical waveguide (ARROW) biosensor chip, a detection limit of 0.021pfu/mL for clinical samples is achieved without target amplification. This RNA target capture efficiency is two orders of magnitude higher than previous results using streptavidin beads and the limit of detection (LOD) improves 10×. The wide dynamic range of this technique covers the whole clinically applicable concentration range. In addition, the current sample preparation time is ~1h which is eight times faster than previous work. This multiplexed, miniaturized sample preparation microdevice establishes a key technology that intended to develop next generation point-of-care (POC) detection system.
Collapse
Affiliation(s)
- K Du
- Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, USA
| | - H Cai
- School of Engineering, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA
| | - M Park
- Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, USA
| | - T A Wall
- ECEn Department, Brigham Young University, 459 Clyde Building, Provo, UT 84602, USA
| | - M A Stott
- ECEn Department, Brigham Young University, 459 Clyde Building, Provo, UT 84602, USA
| | - K J Alfson
- Department of Virology and Immunology, Texas Biomedical Research Institute, 7620 NW Loop 410, San Antonio, TX 78227, USA
| | - A Griffiths
- Department of Virology and Immunology, Texas Biomedical Research Institute, 7620 NW Loop 410, San Antonio, TX 78227, USA
| | - R Carrion
- Department of Virology and Immunology, Texas Biomedical Research Institute, 7620 NW Loop 410, San Antonio, TX 78227, USA
| | - J L Patterson
- Department of Virology and Immunology, Texas Biomedical Research Institute, 7620 NW Loop 410, San Antonio, TX 78227, USA
| | - A R Hawkins
- ECEn Department, Brigham Young University, 459 Clyde Building, Provo, UT 84602, USA
| | - H Schmidt
- School of Engineering, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA.
| | - R A Mathies
- Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, USA.
| |
Collapse
|
35
|
Zhou T, Wang H, Shi L, Liu Z, Joo SW. An Enhanced Electroosmotic Micromixer with an Efficient Asymmetric Lateral Structure. MICROMACHINES 2016; 7:E218. [PMID: 30404389 PMCID: PMC6190438 DOI: 10.3390/mi7120218] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 11/17/2016] [Accepted: 11/24/2016] [Indexed: 11/22/2022]
Abstract
Homogeneous and rapid mixing in microfluidic devices is difficult to accomplish, owing to the low Reynolds number associated with most flows in microfluidic channels. Here, an efficient electroosmotic micromixer based on a carefully designed lateral structure is demonstrated. The electroosmotic flow in this mixer with an asymmetrical structure induces enhanced disturbance in the micro channel, helping the fluid streams' folding and stretching, thereby enabling appreciable mixing. Quantitative analysis of the mixing efficiency with respect to the potential applied and the flow rate suggests that the electroosmotic microfluidic mixer developed in the present work can achieve efficient mixing with low applied potential.
Collapse
Affiliation(s)
- Teng Zhou
- Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, Hainan, China.
- School of Mechanical Engineering, Yeungnam University, Gyongsan 712-719, Korea.
| | - Hanlin Wang
- Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, Hainan, China.
| | - Liuyong Shi
- Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, Hainan, China.
| | - Zhenyu Liu
- Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP), Chinese Academy of Science, Changchun 130033, Jilin, China.
| | - Sang Woo Joo
- School of Mechanical Engineering, Yeungnam University, Gyongsan 712-719, Korea.
| |
Collapse
|
36
|
Yang F, Kuang C, Zhao W, Wang G. AC Electrokinetic Fast Mixing in Non-Parallel Microchannels. CHEM ENG COMMUN 2016. [DOI: 10.1080/00986445.2016.1253009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
37
|
Bone cement flow analysis by stepwise injection through medical cannulas. Med Eng Phys 2016; 38:1434-1438. [PMID: 27727118 DOI: 10.1016/j.medengphy.2016.09.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Revised: 08/31/2016] [Accepted: 09/23/2016] [Indexed: 11/24/2022]
Abstract
Cement leakage is a serious adverse event potentially occurring during vertebroplasty. Pre-operative in-silico planning of the cement filling process can help reducing complication rates related to leakage. This requires a better understanding of the cement flow along the whole injection path. Therefore, the aim of the present study was to analyze bone cement flow behavior by stepwise injections through medical cannulas. Sixteen cannulas were assigned to four groups for stepwise injection of differently colored cement portions of 1ml volume. Each group differed in the amount of injected cement portions with a range of 1-4ml. After cement curing longitudinal cross-sections of the cannulas were performed and high-resolution pictures taken. Based on these pictures, quadratic polynomial interpolation was applied to the marked intersections between the last two injected cement portions to calculate the leading coefficients. Leading coefficients in the groups with three cement portions (0.287 ± 0.078), four portions (0.243 ± 0.041) and two portions (0.232 ± 0.050) were comparable and significantly higher than the group with one cement portion (0.0032 ± 0.0004), p ≤ 0.016. Based on these findings, cement flow through medical cannulas can be considered as predictable and can therefore be excluded as a source of risk for possible cement leakage complications during vertebroplasty procedures.
Collapse
|
38
|
Bone cement allocation analysis in artificial cancellous bone structures. J Orthop Translat 2016; 8:40-48. [PMID: 30035093 PMCID: PMC5987039 DOI: 10.1016/j.jot.2016.09.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Revised: 08/19/2016] [Accepted: 09/13/2016] [Indexed: 11/24/2022] Open
Abstract
Background One of the most serious adverse events potentially occurring during vertebroplasty is cement leakage. Associated risks for the patient could be reduced if cement filling is preoperatively planned. This requires a better understanding of cement flow behaviour. Therefore, the aim of the present study was to investigate bone cement distribution in artificial inhomogeneous cancellous bone structures during a simulated stepwise injection procedure. Methods Four differently coloured 1-mL cement portions were injected stepwise into six open-porous aluminum foam models with simulated leakage paths. Each model was subsequently cross-sectioned and high-resolution pictures were taken, followed by anatomical site allocation based on the assumption about a posterior insertion of the cannula. A radial grid consisting of 36 equidistant beams (0°–350°) was applied to evaluate the cement flow along each beam by measuring the radial length of each cement portion (total length) and of all four portions together (distance to border). Independently from the injection measurements, the viscosity of 20 cement portions was measured at time points corresponding to the start of the first and the end of the last injection. Results Despite some diffuse colour transitions at the borderlines, no interfusion between the differently coloured cement portions was observed. The two highest values for total length of each of the first three injected cement portions and for distance to border were indicated in directions anterior bilateral to the cannula along the 120°, 240° and 250° beams and posterolateral along the 60° beam. The two highest total lengths for the fourth cement portion were registered in the direction of the cannula along the 170° and 180° beams. Standard deviations of total length for each of the last three injected portions and for distance to border were with two highest values in directions anterior bilateral to the cannula along the 120°, 150°, 240° and 250° beams and opposite to the direction of the cannula along the 10° beam. The two highest values for the first cement portion were registered posterior bilateral to the cannula along the 70° and 350° beams. The values for averaged standard deviations of the total length of the fourth cement portion and the distance to border were significantly higher in comparison to the first cement portion (p ≤ 0.020). Dynamic viscosity at the start of the first injection was 343 ± 108 Pa∙s and increased to 659 ± 208 Pa∙s at the end of the fourth injection. Conclusion The simulated leakage path seemed to be the most important adverse injection factor influencing the uniformity of cement distribution. Another adverse factor causing dispersion of this distribution was represented by the simulated bone marrow. However, the rather uniform distribution of the totally injected cement amount, considered as one unit, could be ascribed to the medium viscosity of the used cement. Finally, with its short waiting time of 45 s, the stepwise injection procedure was shown to be ineffective in preventing cement leakage.
Collapse
|
39
|
Turbulence in microfluidics: Cleanroom-free, fast, solventless, and bondless fabrication and application in high throughput liquid-liquid extraction. Anal Chim Acta 2016; 940:73-83. [DOI: 10.1016/j.aca.2016.08.052] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 08/27/2016] [Accepted: 08/29/2016] [Indexed: 11/13/2022]
|
40
|
Zambrano HA, Vásquez N, Wagemann E. Wall embedded electrodes to modify electroosmotic flow in silica nanoslits. Phys Chem Chem Phys 2016; 18:1202-11. [PMID: 26658698 DOI: 10.1039/c5cp05785j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Electroosmotic flow in a silica slit channel with nonuniform surface charge density is investigated. In nanoconfinement, the electrical double layer occupies a non-negligible fraction of the system. Therefore, modifying the charge density on specific locations on the channel wall surface allows effective manipulation of the electroosmotic flow rates. In the present study, extensive (160 ns) nonequilibrium molecular dynamics simulations are conducted to investigate the ability of controlling the electroosmotic flow control in a nanoslit by patterning the surface potential. The mechanism to modify the surface charge consists of a set of charged electrodes embedded within one of the channel walls. The presence of the embedded electrodes results in the redistribution of ions in the electrolyte solution and in the alteration of the electroosmotic flow throughout the nanochannel. Indeed, the results reveal significant changes in the electroosmotic driving force and velocity profiles including local flow reversal. This study provides physical insight into the direct manipulation of the electrokinetic flow in nanoslits.
Collapse
Affiliation(s)
- Harvey A Zambrano
- Department of Chemical Engineering, Universidad de Concepcion, Concepcion, Chile.
| | - Nicolás Vásquez
- Department of Chemical Engineering, Universidad de Concepcion, Concepcion, Chile.
| | - Enrique Wagemann
- Department of Chemical Engineering, Universidad de Concepcion, Concepcion, Chile.
| |
Collapse
|
41
|
Wang G, Yang F, Zhao W, Chen CP. On micro-electrokinetic scalar turbulence in microfluidics at a low Reynolds number. LAB ON A CHIP 2016; 16:1030-1038. [PMID: 26887934 DOI: 10.1039/c5lc01541c] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We recently demonstrated the direct observation of micro-electrokinetic turbulence in a microchannel at a low Reynolds number (Re) when a pressure-driven flow was forced electrokinetically. Here, we characterize the corresponding scalar turbulence and surprisingly find that the corresponding turbulent mixing has some typical and important features of scalar turbulence, such as the Obukhov-Corrsin (O-C) -5/3 spectrum of concentration fluctuation, which can commonly be realized only at high Re in macroflows. This discovery could provide a new perspective of scalar turbulence and an avenue for control of transport phenomena in lab-on-a-chip platforms. This will deepen our fundamental understanding of transport phenomena in microfluidics.
Collapse
Affiliation(s)
- Guiren Wang
- Department of Mechanical Engineering, University of South Carolina, Columbia, SC, USA.
| | | | | | | |
Collapse
|
42
|
Varshney A, Gohil S, Sathe M, R V SR, Joshi JB, Bhattacharya S, Yethiraj A, Ghosh S. Multiscale flow in an electro-hydrodynamically driven oil-in-oil emulsion. SOFT MATTER 2016; 12:1759-1764. [PMID: 26693675 DOI: 10.1039/c5sm02316e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Efficient mixing strategies in a fluid involve generation of multi-scale flows which are strongly suppressed in highly viscous systems. In this work, we report a novel form of multi-scale flow, driven by an external electric field, in a highly viscous (η∼ 1 Pa s) oil-in-oil emulsion system consisting of micron-size droplets. This electro-hydrodynamic flow leads to dynamical organization at spatial scales much larger than that of the individual droplets. We characterize the dynamics associated with these structures by measuring the time variation of the bulk Reynolds stress in a rheometer, as well as through a micro-scale rheometric measurement by probing the spectrum of fluctuations of a thin fiber cantilever driven by these flows. The results display scale invariance in the energy spectra over three decades with a power law reminiscent of turbulent convection. We also demonstrate the mixing efficiency in such micro-scale systems.
Collapse
Affiliation(s)
- Atul Varshney
- Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel.
| | | | | | | | | | | | | | | |
Collapse
|
43
|
Wang G, Yang F, Zhao W. Microelectrokinetic turbulence in microfluidics at low Reynolds number. Phys Rev E 2016; 93:013106. [PMID: 26871154 DOI: 10.1103/physreve.93.013106] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Indexed: 06/05/2023]
Abstract
There is commonly no turbulence in microfluidics, and the flows are believed to be either laminar or chaotic, since Reynolds number (Re) in microflows is usually on the order of unity or lower. However, we recently demonstrated that it is possible to achieve turbulence with low Re (based on the measured flow velocity and the width of the channel entrance) when a pressure-driven flow is electrokinetically forced in a quasi T-microchannel. To be able to measure high frequency velocity fluctuations in microchannels, a velocimeter with submicrometer spatial resolution and microsecond temporal resolution, called a laser-induced fluorescence photobleaching anemometer, is developed. Here we characterize the microelectrokinetic turbulence and observe some typical and important features of high Re flows, such as Kolmogorov -5/3 spectrum of velocity fluctuation, which usually can be realized only at very high Re in macroturbulent flows.
Collapse
Affiliation(s)
- Guiren Wang
- Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina 29208, USA
- Biomedical Engineering Program, University of South Carolina, Columbia, South Carolina 29208, USA
| | - Fang Yang
- Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina 29208, USA
| | - Wei Zhao
- Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina 29208, USA
- Institute of Photonics and Photo-technology, International Scientific and Technological Cooperation Base of Photoelectric Technology and Functional Materials and Application, Northwest University, 229 North Taibai Rd, Xi'an 710069, People's Republic of China
| |
Collapse
|
44
|
Karatay E, Druzgalski CL, Mani A. Simulation of chaotic electrokinetic transport: Performance of commercial software versus custom-built direct numerical simulation codes. J Colloid Interface Sci 2015; 446:67-76. [DOI: 10.1016/j.jcis.2014.12.081] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 12/20/2014] [Accepted: 12/23/2014] [Indexed: 11/30/2022]
|
45
|
Kim SH, Lee GH, Park JY, Lee SH. Microplatforms for gradient field generation of various properties and biological applications. ACTA ACUST UNITED AC 2014; 20:82-95. [PMID: 25510472 DOI: 10.1177/2211068214562247] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Well-designed microfluidic platforms can be excellent tools to eliminate bottleneck problems or issues that have arisen in biological fields by providing unprecedented high-resolution control of mechanical and chemical microenvironments for cell culture. Among such microtechnologies, the precise generation of biochemical concentration gradients has been highly regarded in the biorelated scientific fields; even today, the principles and mechanisms for gradient generation continue to be refined, and the number of applications for this technique is growing. Here, we review the current status of the concentration gradient generation technologies achieved in various microplatforms and how they have been and will be applied to biological issues, particularly those that have arisen from cancer research, stem cell research, and tissue engineering. We also provide information about the advances and future challenges in the technological aspects of microscale concentration gradient generation.
Collapse
Affiliation(s)
- Sung-Hwan Kim
- School of Mechanical Engineering, College of Engineering, Chung-Ang University, Seoul, Republic of Korea
| | - Gi-Hun Lee
- School of Mechanical Engineering, College of Engineering, Chung-Ang University, Seoul, Republic of Korea
| | - Joong Yull Park
- School of Mechanical Engineering, College of Engineering, Chung-Ang University, Seoul, Republic of Korea
| | - Sang-Hoon Lee
- Department of Biomedical Engineering, College of Health Science, Korea University, Seoul, Republic of Korea
| |
Collapse
|