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Diwakar NM, Yossifon G, Miloh T, Velev OD. Active microparticle propulsion pervasively powered by asymmetric AC field electrophoresis. J Colloid Interface Sci 2024; 676:817-825. [PMID: 39067217 DOI: 10.1016/j.jcis.2024.07.141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2024] [Revised: 07/16/2024] [Accepted: 07/17/2024] [Indexed: 07/30/2024]
Abstract
HYPOTHESIS Symmetry breaking in an electric field-driven active particle system can be induced by applying a spatially uniform, but temporally non-uniform, alternating current (AC) signal. Regardless of the type of particles exposed to sawtooth AC signals, the unevenly induced polarization of the ionic charge layer leads to a major electrohydrodynamic effect of active propulsion, termed Asymmetric Field Electrophoresis (AFEP). EXPERIMENTS Suspensions containing latex microspheres of three sizes, as well as Janus and metal-coated particles were subjected to sawtooth AC signals of varying voltages, frequencies, and time asymmetries. Particle tracking via microscopy was used to analyze their motility as a function of the key parameters. FINDINGS The particles exhibit field-colinear active propulsion, and the temporal reversal of the AC signal results in a reversal of their direction of motion. The experimental velocity data as a function of field strength, frequency, and signal asymmetry are supported by models of asymmetric ionic concentration-polarization. The direction of particle migration exhibits a size-dependent crossover in the low frequency domain. This enables new approaches for simple and efficient on-chip sorting. Combining AFEP with other AC motility mechanisms, such as induced-charge electrophoresis, allows multiaxial control of particle motion and could enable development of novel AC field-driven active microsystems.
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Affiliation(s)
- Nidhi M Diwakar
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695-7905, USA
| | - Gilad Yossifon
- School of Mechanical Engineering, University of Tel-Aviv, Tel-Aviv 69978, Israel
| | - Touvia Miloh
- School of Mechanical Engineering, University of Tel-Aviv, Tel-Aviv 69978, Israel
| | - Orlin D Velev
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695-7905, USA.
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2
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Elkeles T, Park S, Werner JG, Weitz DA, Yossifon G. Dielectrophoretic Characterization of Dynamic Microcapsules and Their Magnetophoretic Manipulation. ACS APPLIED MATERIALS & INTERFACES 2022; 14:15765-15773. [PMID: 35322665 DOI: 10.1021/acsami.1c23482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In this work, we present dielectrophoresis (DEP) and in situ electrorotation (ROT) characterization of reversibly stimuli-responsive "dynamic" microcapsules that change the physicochemical properties of their shells under varying pH conditions and can encapsulate and release (macro)molecular cargo on demand. Specifically, these capsules are engineered to open (close) their shell under high (low) pH conditions and thus to release (retain) their encapsulated load or to capture and trap (macro)molecular samples from their environment. We show that the steady-state DEP and ROT spectra of these capsules can be modeled using a single-shell model and that the conductivity of their shells is influenced most by the pH. Furthermore, we measured the transient response of the angular velocity of the capsules under rotating electric field conditions, which allows us to directly determine the characteristic time scales of the underlying physical processes. In addition, we demonstrate the magnetic manipulation of microcapsules with embedded magnetic nanoparticles for lab-on-chip tasks such as encapsulation and release at designated locations and the in situ determination of their physicochemical state using on-chip ROT. The insight gained will enable the advanced design and operation of these dynamic drug delivery and smart lab-on-chip transport systems.
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Affiliation(s)
- Tom Elkeles
- Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel
| | - Sinwook Park
- Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel
| | - Jörg G Werner
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
- Department of Mechanical Engineering, Boston University, Boston, Massachusetts 02215, United States
| | - David A Weitz
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Gilad Yossifon
- Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel
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Kunti G, Wu Y, Yossifon G. Rational Design of Self-Propelling Particles for Unified Cargo Loading and Transportation. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2007819. [PMID: 33709614 DOI: 10.1002/smll.202007819] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 01/29/2021] [Indexed: 06/12/2023]
Abstract
Recent studies on electrically powered active particles that can both self-propel and manipulate cargo load and release, have focused on both spherically shaped Janus particles (JP) and on a parallel electrically conducting plates setup. Yet, spherically shaped JPs set a geometrical limitation on the ability to smartly design multiple dielectrophoretic traps on a single active particle. Herein, these active carriers are extended to accommodate any desired shape and selective metallic coating, using a standard photolithography method. The resulting designed positive and negative dielectrophoretic traps of controlled size, location, and intensity, performed as sophisticated active carriers with a high level of control over their mobility and cargo loading. In addition to cargo loading, the engineered particles exhibit interesting motion in an electrically insulating substrate setup, with in-plane electric field, and, in particular, a tilt angle, and even flipping, that strongly depended on the field frequency and amplitude, hence, exhibiting a much more diverse and rich behavior than spherical JP. The engineered self-propelling carriers are expected to open up new possibilities for unified, label-free and selective cargo loading, transport, and delivery of complex multi-particles.
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Affiliation(s)
- Golak Kunti
- Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory, Technion-Israel Institute of Technology, Technion City, 32000, Israel
| | - Yue Wu
- Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory, Technion-Israel Institute of Technology, Technion City, 32000, Israel
| | - Gilad Yossifon
- Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory, Technion-Israel Institute of Technology, Technion City, 32000, Israel
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Huo X, Wu Y, Boymelgreen A, Yossifon G. Analysis of Cargo Loading Modes and Capacity of an Electrically-Powered Active Carrier. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 36. [PMID: 31805236 DOI: 10.1021/acs.langmuir.9b03036] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The use of active colloids for cargo transport offers unique potential for applications ranging from targeted drug delivery to lab-on-a-chip systems. Previously, Janus particles (JPs), acting as mobile microelectrodes, have been shown to transport cargo which is trapped at the JP surface by a dielectrophoretic mechanism. Herein, we aim to characterize the cargo loading properties of mobile Janus carriers, across a broad range of frequencies and voltages. In expanding the frequency range of the carrier, we are able to compare the influences of different modes of carrier transport on the loading capacity as well as highlight the differences between cargo trapped by positive and negative dielectrophoresis. Specifically, it is shown that cargo trapping results in a reduction in carrier velocities with this effect more pronounced at low frequencies where cargo is trapped close to the substrate. Interestingly, we observe the existence of a maximum cargo loading capacity which decreases at large voltages suggesting a strong interplay between trapping and hydrodynamic shear. Finally, we demonstrate that the control of the frequency can enable different assemblies of binary colloidal solutions on the JP. The resultant findings enable the optimization of electrokinetic cargo transport and its selective application to a broad range of targets.
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Affiliation(s)
- Xiaoye Huo
- Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory , Technion - Israel Institute of Technology , Haifa 32000 , Israel
| | - Yue Wu
- Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory , Technion - Israel Institute of Technology , Haifa 32000 , Israel
| | - Alicia Boymelgreen
- Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory , Technion - Israel Institute of Technology , Haifa 32000 , Israel
| | - Gilad Yossifon
- Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory , Technion - Israel Institute of Technology , Haifa 32000 , Israel
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Functional and proteomic analysis of Ceratonova shasta (Cnidaria: Myxozoa) polar capsules reveals adaptations to parasitism. Sci Rep 2017; 7:9010. [PMID: 28827642 PMCID: PMC5566210 DOI: 10.1038/s41598-017-09955-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 07/20/2017] [Indexed: 12/16/2022] Open
Abstract
Myxozoa is a diverse, speciose group of microscopic parasites, recently placed within the phylum Cnidaria. Myxozoans are highly reduced in size and complexity relative to free-living cnidarians, yet they have retained specialized organelles known as polar capsules, akin to the nematocyst stinging capsules of free-living species. Whereas in free-living cnidarians the stinging capsules are used for prey capture or defense, in myxozoans they have the essential function of initiating the host infection process. To explore the evolutionary adaptation of polar capsules to parasitism, we used as a model organism Ceratonova shasta, which causes lethal disease in salmonids. Here, we report the first isolation of C. shasta myxospore polar capsules using a tailored dielectrophoresis-based microfluidic chip. Using electron microscopy and functional analysis we demonstrated that C. shasta tubules have no openings and are likely used to anchor the spore to the host. Proteomic analysis of C. shasta polar capsules suggested that they have retained typical structural and housekeeping proteins found in nematocysts of jellyfish, sea anemones and Hydra, but have lost the most important functional group in nematocysts, namely toxins. Our findings support the hypothesis that polar capsules and nematocysts are homologous organelles, which have adapted to their distinct functions.
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Impedance Analysis AC Techniques. Cellular Quantification. Bioanalysis 2017. [DOI: 10.1007/978-3-319-64801-9_5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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7
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Design of optimal electrode geometries for dielectrophoresis using fitness based on simplified particle trajectories. Biomed Microdevices 2016; 18:69. [DOI: 10.1007/s10544-016-0085-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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8
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Dielectrophoretic characterization of cells in a stationary nanoliter droplet array with generated chemical gradients. Biomed Microdevices 2015; 17:91. [PMID: 26286862 DOI: 10.1007/s10544-015-9996-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A novel design of reusable microfluidic platform that generates a stationary nanoliter droplet array (SNDA) for cell incubation and analysis, equipped with a complementary array of individually addressable electrodes for each microwell is studied. Various solute concentration gradients were generated between the wells where dielectrophoresis (DEP) was used to characterize the effect of the gradients on the cell's response. The feasibility of generating concentration gradients and observation of DEP responses was demonstrated using a gradient of salts in combination with microparticles and viable cells. L1210 Lymphoma cells were used as the model cells in these experiments. Lymphoma cells' cross-over frequency (COF) decreased with increasing stress conditions. Specifically, a linear decrease in the cell COF was measured as a function of solution tonicity and blebbistatin dose. Lymphoma cells were incubated under a gradient of the chemotherapeutic agent doxorubicin (DOX), which led to saturation in the cell-COF response at 30 nM DOX, demonstrating the potential of the platform in screening of label-free drugs.
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del Moral-Zamora B, Punter-Villagrassa J, Oliva-Brañas AM, Álvarez-Azpeitia JM, Colomer-Farrarons J, Samitier J, Homs-Corbera A, Miribel-Català PL. Combined dielectrophoretic and impedance system for on-chip controlled bacteria concentration: Application toEscherichia coli. Electrophoresis 2015; 36:1130-41. [DOI: 10.1002/elps.201400446] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 02/04/2015] [Accepted: 02/09/2015] [Indexed: 12/20/2022]
Affiliation(s)
| | | | - Ana M. Oliva-Brañas
- Nanobioengineering Group; Institute for Bioengineering of Catalonia (IBEC); Barcelona Spain
| | | | | | - Josep Samitier
- Department of Electronics; University of Barcelona; Barcelona Spain
- Nanobioengineering Group; Institute for Bioengineering of Catalonia (IBEC); Barcelona Spain
- Centro de Investigación Biomédica en Red en Bioingeniería; Biomateriales y Nanomedicina (CIBER-BBN); Zaragoza Spain
| | - Antoni Homs-Corbera
- Department of Electronics; University of Barcelona; Barcelona Spain
- Nanobioengineering Group; Institute for Bioengineering of Catalonia (IBEC); Barcelona Spain
- Centro de Investigación Biomédica en Red en Bioingeniería; Biomateriales y Nanomedicina (CIBER-BBN); Zaragoza Spain
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10
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del Moral Zamora B, Álvarez Azpeitia JM, Oliva Brañas AM, Colomer-Farrarons J, Castellarnau M, Miribel-Català PL, Homs-Corbera A, Juárez A, Samitier J. Dielectrophoretic concentrator enhancement based on dielectric poles for continuously flowing samples. Electrophoresis 2015; 36:1405-13. [PMID: 25630478 DOI: 10.1002/elps.201400433] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Revised: 12/09/2014] [Accepted: 01/12/2015] [Indexed: 01/09/2023]
Abstract
We describe a novel continuous-flow cell concentrator microdevice based on dielectrophoresis, and its associated custom-made control unit. The performances of a classical interdigitated metal electrode-based dielectrophoresis microfluidic device and this enhanced version, that includes insulator-based pole structures, were compared using the same setup. Escherichia coli samples were concentrated at several continuous flows and the device's trapping efficiencies were evaluated by exhaustive cell counts. Our results show that pole structures enhance the retention up to 12.6%, obtaining significant differences for flow rates up to 20 μL/min, when compared to an equivalent classical interdigitated electrodes setup. In addition, we performed a subsequent proteomic analysis to evaluate the viability of the biological samples after the long exposure to the actuating electrical field. No Escherichia coli protein alteration in any of the two systems was observed.
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Affiliation(s)
- Beatriz del Moral Zamora
- Department of Electronics, Discrete to Integrated Electronics (D2In) group, University of Barcelona, Barcelona, Spain
| | | | - Ana Maria Oliva Brañas
- Nanobioengineering group, Institute for Bioengineering of Catalonia (IBEC), Barcelona, Spain
| | - Jordi Colomer-Farrarons
- Department of Electronics, Discrete to Integrated Electronics (D2In) group, University of Barcelona, Barcelona, Spain
| | - Marc Castellarnau
- Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Pere Ll Miribel-Català
- Department of Electronics, Discrete to Integrated Electronics (D2In) group, University of Barcelona, Barcelona, Spain
| | - Antoni Homs-Corbera
- Department of Electronics, Discrete to Integrated Electronics (D2In) group, University of Barcelona, Barcelona, Spain.,Nanobioengineering group, Institute for Bioengineering of Catalonia (IBEC), Barcelona, Spain.,Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain
| | - Antonio Juárez
- Microbial Biotechnology and Host-Pathogen Interaction, Institute for Bioengineering of Catalonia (IBEC), Barcelona, Spain.,Department of Microbiology, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Josep Samitier
- Department of Electronics, Discrete to Integrated Electronics (D2In) group, University of Barcelona, Barcelona, Spain.,Nanobioengineering group, Institute for Bioengineering of Catalonia (IBEC), Barcelona, Spain.,Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain
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11
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Ben-Bassat D, Boymelgreen A, Yossifon G. The influence of flow intensity and field frequency on continuous-flow dielectrophoretic trapping. J Colloid Interface Sci 2015; 442:154-61. [DOI: 10.1016/j.jcis.2014.11.037] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2014] [Revised: 11/12/2014] [Accepted: 11/16/2014] [Indexed: 12/15/2022]
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12
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Jarvas G, Szigeti M, Hajba L, Furjes P, Guttman A. Computational Fluid Dynamics-Based Design of a Microfabricated Cell Capture Device. J Chromatogr Sci 2014; 53:411-6. [DOI: 10.1093/chromsci/bmu110] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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13
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Adams TNG, Turner PA, Janorkar AV, Zhao F, Minerick AR. Characterizing the dielectric properties of human mesenchymal stem cells and the effects of charged elastin-like polypeptide copolymer treatment. BIOMICROFLUIDICS 2014; 8:054109. [PMID: 25332746 PMCID: PMC4191366 DOI: 10.1063/1.4895756] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Accepted: 09/04/2014] [Indexed: 05/05/2023]
Abstract
HUMAN MESENCHYMAL STEM CELLS (HMSCS) HAVE THREE KEY PROPERTIES THAT MAKE THEM DESIRABLE FOR STEM CELL THERAPEUTICS: differentiation capacity, trophic activity, and ability to self-renew. However, current separation techniques are inefficient, time consuming, expensive, and, in some cases, alter hMSCs cellular function and viability. Dielectrophoresis (DEP) is a technique that uses alternating current electric fields to spatially separate biological cells based on the dielectric properties of their membrane and cytoplasm. This work implements the first steps toward the development of a continuous cell sorting microfluidic device by characterizing native hMSCs dielectric signatures and comparing them to hMSCs morphologically standardized with a polymer. A quadrapole Ti-Au electrode microdevice was used to observe hMSC DEP behaviors, and quantify frequency spectra and cross-over frequency of hMSCs from 0.010-35 MHz in dextrose buffer solutions (0.030 S/m and 0.10 S/m). This combined approach included a systematic parametric study to fit a core-shell model to the DEP spectra over the entire tested frequency range, adding robustness to the analysis technique. The membrane capacitance and permittivity were found to be 2.2 pF and 2.0 in 0.030 S/m and 4.5 pF and 4.1 in 0.10 S/m, respectively. Elastin-like polypeptide (ELP-) polyethyleneimine (PEI) copolymer was used to control hMSCs morphology to spheroidal cells and aggregates. Results demonstrated that ELP-PEI treatment controlled hMSCs morphology, increased experiment reproducibility, and concurrently increased hMSCs membrane permittivity to shift the cross-over frequency above 35 MHz. Therefore, ELP-PEI treatment may serve as a tool for the eventual determination of biosurface marker-dependent DEP signatures and hMSCs purification.
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Affiliation(s)
- T N G Adams
- Department of Chemical Engineering, Michigan Technological University , Houghton, Michigan 49931, USA
| | - P A Turner
- Department of Biomedical Materials Science, School of Dentistry, University of Mississippi Medical Center , Jackson, Mississippi 39216, USA
| | - A V Janorkar
- Department of Biomedical Materials Science, School of Dentistry, University of Mississippi Medical Center , Jackson, Mississippi 39216, USA
| | - F Zhao
- Department of Biomedical Engineering, Michigan Technological University , Houghton, Michigan 49931, USA
| | - A R Minerick
- Department of Chemical Engineering, Michigan Technological University , Houghton, Michigan 49931, USA
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Ye T, Li H, Lam KY. Two-dimensional numerical modeling for separation of deformable cells using dielectrophoresis. Electrophoresis 2014; 36:378-85. [DOI: 10.1002/elps.201400251] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Revised: 05/19/2014] [Accepted: 06/09/2014] [Indexed: 11/07/2022]
Affiliation(s)
- Ting Ye
- School of Mechanical and Aerospace Engineering; Nanyang Technological University; Singapore Singapore
| | - Hua Li
- School of Mechanical and Aerospace Engineering; Nanyang Technological University; Singapore Singapore
| | - K. Y. Lam
- School of Mechanical and Aerospace Engineering; Nanyang Technological University; Singapore Singapore
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Dash S, Mohanty S. Dielectrophoretic separation of micron and submicron particles: a review. Electrophoresis 2014; 35:2656-72. [PMID: 24930837 DOI: 10.1002/elps.201400084] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Revised: 06/03/2014] [Accepted: 06/05/2014] [Indexed: 11/06/2022]
Abstract
This paper provides an overview on separation of micron and submicron sized biological (cells, yeast, virus, bacteria, etc.) and nonbiological particles (latex, polystyrene, CNTs, metals, etc.) by dielectrophoresis (DEP), which finds wide applications in the field of medical and environmental science. Mathematical models to predict the electric field, flow profile, and concentration profiles of the particles under the influence of DEP force have also been covered in this review. In addition, advancements made primarily in the last decade, in the area of electrode design (shape and arrangement), new materials for electrode (carbon, silicon, polymers), and geometry of the microdevice, for efficient DEP separation of particles have been highlighted.
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Affiliation(s)
- Swagatika Dash
- CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, India
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Park S, Bassat DB, Yossifon G. Individually addressable multi-chamber electroporation platform with dielectrophoresis and alternating-current-electro-osmosis assisted cell positioning. BIOMICROFLUIDICS 2014; 8:024117. [PMID: 24803966 PMCID: PMC4000404 DOI: 10.1063/1.4873439] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Accepted: 04/16/2014] [Indexed: 05/09/2023]
Abstract
A multi-functional microfluidic platform was fabricated to demonstrate the feasibility of on-chip electroporation integrated with dielectrophoresis (DEP) and alternating-current-electro-osmosis (ACEO) assisted cell/particle manipulation. A spatial gradient of electroporation parameters was generated within a microchamber array and validated using normal human dermal fibroblast (NHDF) cells and red fluorescent protein-expressing human umbilical vein endothelial cells (RFP-HUVECs) with various fluorescent indicators. The edge of the bottom electrode, coinciding with the microchamber entrance, may act as an on-demand gate, functioning under either positive or negative DEP. In addition, at sufficiently low activation frequencies, ACEO vortices can complement the DEP to contribute to a rapid trapping/alignment of particles. As such, results clearly indicate that the microfluidic platform has the potential to achieve high-throughput screening for electroporation with spatial control and uniformity, assisted by DEP and ACEO manipulation/trapping of particles/cells into individual microchambers.
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Affiliation(s)
- Sinwook Park
- Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory, Technion-Israel Institute of Technology, Technion City 32000, Israel
| | - Dana Ben Bassat
- Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory, Technion-Israel Institute of Technology, Technion City 32000, Israel
| | - Gilad Yossifon
- Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory, Technion-Israel Institute of Technology, Technion City 32000, Israel
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Jarvas G, Guttman A. Modeling of cell sorting and rare cell capture with microfabricated biodevices. Trends Biotechnol 2013; 31:696-703. [DOI: 10.1016/j.tibtech.2013.10.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Revised: 09/30/2013] [Accepted: 10/02/2013] [Indexed: 01/22/2023]
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