Abstract
This study presents a sheathless and portable microfluidic chip that is capable of high-throughput focusing bioparticles based on 3D travelling-wave dielectrophoresis (twDEP). High-throughput focusing is achieved by sustaining a centralized twDEP field normal to the continuous through-flow direction. Two twDEP electrode arrays are formed from upper and lower walls of the microchannel and extend to its center, which induce twDEP forces to provide the lateral displacements in two directions for focusing the bioparticles. Bioparticles can be focused to the center of the microchannel effectively by twDEP conveyance when the characteristic time due to twDEP conveying in the y direction is shorter than the residence time of the particles within twDEP electrode array. Red blood cells can be effectively focused into a narrow particle stream (∼10 μm) below a critical flow rate of 10 ll/min (linear flow velocity ∼5 mm/s), when under a voltage of 14 Vp-p at a frequency of 500 kHz is applied. Approximately 90% focusing efficiency for red blood cells can be achieved within two 6-mm-long electrode arrays when the flow rate is below 12 μl/min. Blood cells and Candida cells were also focused and sorted successfully based on their different twDEP mobilities. Compared to conventional 3D-paired DEP focusing, velocity is enhanced nearly four folds of magnitude. 3D twDEP provides the lateral displacements of particles and long residence time for migrating particles in a high-speed continuous flow, which breaks through the limitation of many electrokinetic cell manipulation techniques.
| Original language | English |
|---|---|
| Pages (from-to) | 649-660 |
| Number of pages | 12 |
| Journal | Microfluidics and Nanofluidics |
| Volume | 10 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2011 Mar 1 |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
- Materials Chemistry
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High-throughput electrokinetic bioparticle focusing based on a travelling-wave dielectrophoretic field. / Cheng, I. Fang; Chung, Cheng Che; Chang, Hsien-Chang.
In: Microfluidics and Nanofluidics, Vol. 10, No. 3, 01.03.2011, p. 649-660.Research output: Contribution to journal › Article
TY - JOUR
T1 - High-throughput electrokinetic bioparticle focusing based on a travelling-wave dielectrophoretic field
AU - Cheng, I. Fang
AU - Chung, Cheng Che
AU - Chang, Hsien-Chang
PY - 2011/3/1
Y1 - 2011/3/1
N2 - This study presents a sheathless and portable microfluidic chip that is capable of high-throughput focusing bioparticles based on 3D travelling-wave dielectrophoresis (twDEP). High-throughput focusing is achieved by sustaining a centralized twDEP field normal to the continuous through-flow direction. Two twDEP electrode arrays are formed from upper and lower walls of the microchannel and extend to its center, which induce twDEP forces to provide the lateral displacements in two directions for focusing the bioparticles. Bioparticles can be focused to the center of the microchannel effectively by twDEP conveyance when the characteristic time due to twDEP conveying in the y direction is shorter than the residence time of the particles within twDEP electrode array. Red blood cells can be effectively focused into a narrow particle stream (∼10 μm) below a critical flow rate of 10 ll/min (linear flow velocity ∼5 mm/s), when under a voltage of 14 Vp-p at a frequency of 500 kHz is applied. Approximately 90% focusing efficiency for red blood cells can be achieved within two 6-mm-long electrode arrays when the flow rate is below 12 μl/min. Blood cells and Candida cells were also focused and sorted successfully based on their different twDEP mobilities. Compared to conventional 3D-paired DEP focusing, velocity is enhanced nearly four folds of magnitude. 3D twDEP provides the lateral displacements of particles and long residence time for migrating particles in a high-speed continuous flow, which breaks through the limitation of many electrokinetic cell manipulation techniques.
AB - This study presents a sheathless and portable microfluidic chip that is capable of high-throughput focusing bioparticles based on 3D travelling-wave dielectrophoresis (twDEP). High-throughput focusing is achieved by sustaining a centralized twDEP field normal to the continuous through-flow direction. Two twDEP electrode arrays are formed from upper and lower walls of the microchannel and extend to its center, which induce twDEP forces to provide the lateral displacements in two directions for focusing the bioparticles. Bioparticles can be focused to the center of the microchannel effectively by twDEP conveyance when the characteristic time due to twDEP conveying in the y direction is shorter than the residence time of the particles within twDEP electrode array. Red blood cells can be effectively focused into a narrow particle stream (∼10 μm) below a critical flow rate of 10 ll/min (linear flow velocity ∼5 mm/s), when under a voltage of 14 Vp-p at a frequency of 500 kHz is applied. Approximately 90% focusing efficiency for red blood cells can be achieved within two 6-mm-long electrode arrays when the flow rate is below 12 μl/min. Blood cells and Candida cells were also focused and sorted successfully based on their different twDEP mobilities. Compared to conventional 3D-paired DEP focusing, velocity is enhanced nearly four folds of magnitude. 3D twDEP provides the lateral displacements of particles and long residence time for migrating particles in a high-speed continuous flow, which breaks through the limitation of many electrokinetic cell manipulation techniques.
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U2 - 10.1007/s10404-010-0699-8
DO - 10.1007/s10404-010-0699-8
M3 - Article
VL - 10
SP - 649
EP - 660
JO - Microfluidics and Nanofluidics
JF - Microfluidics and Nanofluidics
SN - 1613-4982
IS - 3
ER -