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Goyette PA, Boulais É, Tremblay M, Gervais T. Pixel-based open-space microfluidics for versatile surface processing. Proc Natl Acad Sci U S A 2021; 118:e2019248118. [PMID: 33376203 PMCID: PMC7812784 DOI: 10.1073/pnas.2019248118] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
An increasing number of applications in biology, chemistry, and material sciences require fluid manipulation beyond what is possible with current automated pipette handlers, such as gradient generation, interface reactions, reagent streaming, and reconfigurability. In this article, we introduce the pixelated chemical display (PCD), a scalable strategy for highly parallel, reconfigurable liquid handling on open surfaces. Microfluidic "pixels" are created when a fluid stream injected above a surface is confined by neighboring identical fluid streams, forming a repeatable flow unit that can be used to tesselate a surface. PCDs generating up to 144 pixels are fabricated and used to project "chemical moving pictures" made of several reagents over both immersed and dry surfaces, without any physical barrier or wall. This work distinguishes itself from previous work in open-space microfluidics by presenting a device architecture where the number of confinement areas can be scaled to any size. Furthermore, it challenges the open-space tenet that the aspiration rate must be higher than the injection rate for reagents to be confined. Overall, this article sets the foundation for massively parallel surface processing using continuous flow streams and showcases possibilities in both wet and dry surface patterning and roll-to-roll processes.
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Affiliation(s)
| | - Étienne Boulais
- Department of Engineering Physics, École Polytechnique de Montréal, Montréal, QC H3T 1J4, Canada
| | - Maude Tremblay
- Department of Engineering Physics, École Polytechnique de Montréal, Montréal, QC H3T 1J4, Canada
| | - Thomas Gervais
- Institut de Génie Biomédical, Polytechnique Montréal, Montréal, QC H3T 1J4, Canada;
- Department of Engineering Physics, École Polytechnique de Montréal, Montréal, QC H3T 1J4, Canada
- Institut du Cancer de Montréal, Centre de Recherche du Centre Hospitalier de l'Université de Montréal, Montréal, QC H2X 0C1, Canada
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Chatzimichail S, Supramaniam P, Ces O, Salehi-Reyhani A. Micropatterning of planar metal electrodes by vacuum filling microfluidic channel geometries. Sci Rep 2018; 8:14380. [PMID: 30258167 PMCID: PMC6158193 DOI: 10.1038/s41598-018-32706-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 09/13/2018] [Indexed: 11/09/2022] Open
Abstract
We present a simple, facile method to micropattern planar metal electrodes defined by the geometry of a microfluidic channel network template. By introducing aqueous solutions of metal into reversibly adhered PDMS devices by desiccation instead of flow, we are able to produce difficult to pattern "dead end" or discontinuous features with ease. We characterize electrodes fabricated using this method and perform electrical lysis of mammalian cancer cells and demonstrate their use as part of an antibody capture assay for GFP. Cell lysis in microwell arrays is achieved using the electrodes and the protein released is detected using an antibody microarray. We show how the template channels used as part of the workflow for patterning the electrodes may be produced using photolithography-free methods, such as laser micromachining and PDMS master moulding, and demonstrate how the use of an immiscible phase may be employed to create electrode spacings on the order of 25-50 μm, that overcome the current resolution limits of such methods. This work demonstrates how the rapid prototyping of electrodes for use in total analysis systems can be achieved on the bench with little or no need for centralized facilities.
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Affiliation(s)
- Stelios Chatzimichail
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London, W12 0BZ, UK
- Institute of Chemical Biology, Molecular Sciences Research Hub, Imperial College London, London, W12 0BZ, UK
| | - Pashiini Supramaniam
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London, W12 0BZ, UK
- Institute of Chemical Biology, Molecular Sciences Research Hub, Imperial College London, London, W12 0BZ, UK
| | - Oscar Ces
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London, W12 0BZ, UK
- Institute of Chemical Biology, Molecular Sciences Research Hub, Imperial College London, London, W12 0BZ, UK
- fabriCELL, Molecular Sciences Research Hub, Imperial College London, London, W12 0BZ, UK
| | - Ali Salehi-Reyhani
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London, W12 0BZ, UK.
- Institute of Chemical Biology, Molecular Sciences Research Hub, Imperial College London, London, W12 0BZ, UK.
- fabriCELL, Molecular Sciences Research Hub, Imperial College London, London, W12 0BZ, UK.
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Saar KL, Zhang Y, Müller T, Kumar CP, Devenish S, Lynn A, Łapińska U, Yang X, Linse S, Knowles TPJ. On-chip label-free protein analysis with downstream electrodes for direct removal of electrolysis products. LAB ON A CHIP 2017; 18:162-170. [PMID: 29192926 DOI: 10.1039/c7lc00797c] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The ability to apply highly controlled electric fields within microfluidic devices is valuable as a basis for preparative and analytical processes. A challenge encountered in the context of such approaches in conductive media, including aqueous buffers, is the generation of electrolysis products at the electrode/liquid interface which can lead to contamination, perturb fluid flows and generally interfere with the measurement process. Here, we address this challenge by designing a single layer microfluidic device architecture where the electric potential is applied outside and downstream of the microfluidic device while the field is propagated back to the chip via the use of a co-flowing highly conductive electrolyte solution that forms a stable interface at the separation region of the device. The co-flowing electrolyte ensures that all the generated electrolysis products, including Joule heat and gaseous products, are flowed away from the chip without coming into contact with the analytes while the single layer fabrication process where all the structures are defined lithographically allows producing the devices in a simple yet highly reproducible manner. We demonstrate that by allowing stable and effective application of electric fields in excess of 100 V cm-1, the described platform provides the basis for rapid separation of heterogeneous mixtures of proteins and protein complexes directly in their native buffers as well as for the simultaneous quantification of their charge states. We illustrate this by probing the interactions in a mixture of an amyloid forming protein, amyloid-β, and a molecular chaperone, Brichos, known to inhibit the process of amyloid formation. The availability of a platform for applying stable electric fields and its compatibility with single-layer soft-lithography processes opens up the possibility of separating and analysing a wide range of molecules on chip, including those with similar electrophoretic mobilities.
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Affiliation(s)
- Kadi L Saar
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.
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Moradi A, Akhlaghi EA, Hajizedeh F, Reihani SNS. Digital holography based submicron thermometry. OPTICS EXPRESS 2016; 24:28678-28685. [PMID: 27958511 DOI: 10.1364/oe.24.028678] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Here we introduce a phase-shifting digital holography-based method to determine the temperature profile around an irradiated (sub-)micron spherical bead. The method utilizes a Mach-Zehnder interferometer implemented into an open setup microscope. The results of irradiated gold spheres with diameter of 400 nm and also silver-coated micron-sized silica beads embedded in silicone oil are presented. We show that the applied method is able to accurately determine the surface temperature with accuracy of 1 °C. Our experimental results perfectly confirm the theoretical prediction of temperature profile around the irradiated bead.
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Kang S, Kim KH, Kim YC. A novel electroporation system for efficient molecular delivery into Chlamydomonas reinhardtii with a 3-dimensional microelectrode. Sci Rep 2015; 5:15835. [PMID: 26522846 PMCID: PMC4629139 DOI: 10.1038/srep15835] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 10/01/2015] [Indexed: 02/06/2023] Open
Abstract
Electroporation is one of the most widely used transfection methods because of its high efficiency and convenience among the various transfection methods. Previous micro-electroporation systems have some drawbacks such as limitations in height and design, time-consuming and an expensive fabrication process due to technical constraints. This study fabricates a three dimensional microelectrode using the 3D printing technique. The interdigitated microstructure consisting of poly lactic acid was injected by a 3D printer and coated with silver and aluminum with a series of dip-coatings. With the same strength of electric field (V cm−1), a higher efficiency for molecular delivery and a higher cellular viability are achieved with the microelectrode than with a standard cuvette. In addition, this study investigates chemicophysical changes such as Joule heating and dissolved metal during electroporation and showed the micro-electroporation system had less chemicophysical changes. It was concluded that the proposed micro-electroporation system will contribute to genetic engineering as a promising delivery tool, and this combination of 3D printing and electroporation has many potential applications for diverse designs or systems.
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Affiliation(s)
- Seongsu Kang
- Korea Advanced Institute of Science and Technology (KAIST), Department of Chemical and Biomolecular Engineering, Daejeon, 305-701, Republic of Korea
| | - Kwon-Ho Kim
- Korea Advanced Institute of Science and Technology (KAIST), Department of Chemical and Biomolecular Engineering, Daejeon, 305-701, Republic of Korea
| | - Yeu-Chun Kim
- Korea Advanced Institute of Science and Technology (KAIST), Department of Chemical and Biomolecular Engineering, Daejeon, 305-701, Republic of Korea
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Herling TW, Arosio P, Müller T, Linse S, Knowles TPJ. A microfluidic platform for quantitative measurements of effective protein charges and single ion binding in solution. Phys Chem Chem Phys 2015; 17:12161-7. [DOI: 10.1039/c5cp00746a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Microfluidic electrophoresis enables the comparison of dry sequence and solvated protein charges, and the detection of protein–ion binding.
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Affiliation(s)
| | - Paolo Arosio
- Department of Chemistry
- University of Cambridge
- Cambridge
- UK
| | - Thomas Müller
- Department of Chemistry
- University of Cambridge
- Cambridge
- UK
| | - Sara Linse
- Department of Biochemistry and Structural Biology
- Lund University
- Lund
- Sweden
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Mustin B, Stoeber B. Low cost integration of 3D-electrode structures into microfluidic devices by replica molding. LAB ON A CHIP 2012; 12:4702-8. [PMID: 23007263 DOI: 10.1039/c2lc40728k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
We demonstrate a new replica molding method for integrating 3D-composite electrodes into microfluidic devices made from polydimethylsiloxane (PDMS) at low cost. Our process does not require work in a cleanroom, expensive materials, or expensive equipment once a micro mold has been fabricated using standard multilayer SU-8 photolithography. Different device geometries have been fabricated to demonstrate the capabilities and limitations of the method. The electrical properties of the composite electrode material are characterized. Furthermore, a device for concentrating particles via AC-dielectrophoresis is presented as an example for a potential application of the fabrication process.
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Affiliation(s)
- Benjamin Mustin
- The University of British Columbia, 2054-6250 Applied Science Lane, Vancouver, BC V6T 1Z4, Canada.
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Noël JM, Velmurugan J, Gökmeşe E, Mirkin MV. Fabrication, characterization, and chemical etching of Ag nanoelectrodes. J Solid State Electrochem 2012. [DOI: 10.1007/s10008-012-1849-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Priest C. Surface patterning of bonded microfluidic channels. BIOMICROFLUIDICS 2010; 4:32206. [PMID: 21045927 PMCID: PMC2967238 DOI: 10.1063/1.3493643] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2010] [Accepted: 09/07/2010] [Indexed: 05/02/2023]
Abstract
Microfluidic channels in which multiple chemical and biological processes can be integrated into a single chip have provided a suitable platform for high throughput screening, chemical synthesis, detection, and alike. These microchips generally exhibit a homogeneous surface chemistry, which limits their functionality. Localized surface modification of microchannels can be challenging due to the nonplanar geometries involved. However, chip bonding remains the main hurdle, with many methods involving thermal or plasma treatment that, in most cases, neutralizes the desired chemical functionality. Postbonding modification of microchannels is subject to many limitations, some of which have been recently overcome. Novel techniques include solution-based modification using laminar or capillary flow, while conventional techniques such as photolithography remain popular. Nonetheless, new methods, including localized microplasma treatment, are emerging as effective postbonding alternatives. This Review focuses on postbonding methods for surface patterning of microchannels.
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Affiliation(s)
- Craig Priest
- Ian Wark Research Institute, ARC Special Research Centre for Particle and Material Interfaces, University of South Australia, Mawson Lakes, South Australia 5095, Australia
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Friend J, Yeo L. Fabrication of microfluidic devices using polydimethylsiloxane. BIOMICROFLUIDICS 2010; 4:026502. [PMID: 20697575 DOI: 10.1063/1.3259624.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2009] [Accepted: 10/16/2009] [Indexed: 05/27/2023]
Abstract
Polydimethylsiloxane (PDMS) is nearly ubiquitous in microfluidic devices, being easy to work with, economical, and transparent. A detailed protocol is provided here for using PDMS in the fabrication of microfluidic devices to aid those interested in using the material in their work, with information on the many potential ways the material may be used for novel devices.
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Affiliation(s)
- James Friend
- Department of Mechanical and Aerospace Engineering, MicroNanophysics Research Laboratory, Monash University, Melbourne VIC 3800 Australia
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Friend J, Yeo L. Fabrication of microfluidic devices using polydimethylsiloxane. BIOMICROFLUIDICS 2010; 4:026502. [PMID: 20697575 PMCID: PMC2917889 DOI: 10.1063/1.3259624] [Citation(s) in RCA: 170] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2009] [Accepted: 10/16/2009] [Indexed: 05/02/2023]
Abstract
Polydimethylsiloxane (PDMS) is nearly ubiquitous in microfluidic devices, being easy to work with, economical, and transparent. A detailed protocol is provided here for using PDMS in the fabrication of microfluidic devices to aid those interested in using the material in their work, with information on the many potential ways the material may be used for novel devices.
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Affiliation(s)
- James Friend
- Department of Mechanical and Aerospace Engineering, MicroNanophysics Research Laboratory, Monash University, Melbourne VIC 3800 Australia
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