Efficient magnetic microbeads trapping using Lab-on-Chip magnetic separator

Research output: Contribution to journalArticle

Abstract

Lab-on-Chip (LoC) magnetic separation is a simple and effective method in separating bioparticles labelled with magnetic microbeads in microfluidics flow condition. In this work, trapping efficiency of magnetic microbeads using LoC magnetic separator and a microfluidics channel with chamber design is determined. The polydimethylsiloxane (PDMS) microfluidics channel was designed with an inlet, an outlet and a circular trapping chamber at the center. Standard soft lithography technique was used to replicate the PDMS microfluidics channel from the SU-8 mould. In a continuous hydrodynamics flow of 1.0 μL/min, trapping efficiency of 99.5 % and 94.9 % for 4.5 μm and 2.5 μm magnetic microbeads respectively was achieved. Flow analysis using COMSOL Multiphysics has been conducted in predicting the possible location of the magnetic beads trapping inside the microfluidics channel. The trapping is possible whenever the magnetic force is larger than the drag force experience by the magnetic microbead. The microfluidics channel with chamber design had facilitated low hydrodynamics drag force on the magnetic beads and resulted high efficiency trapping. Therefore, the development of this LoC magnetic separator may be promising to be utilized for biological studies and point-of-care testing (POCT) applications.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalJournal of Advanced Research in Fluid Mechanics and Thermal Sciences
Volume57
Issue number1
Publication statusPublished - 1 May 2019

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Magnetic separators
Microfluidics
Polydimethylsiloxane
Drag
Hydrodynamics
Magnetic separation
Lithography
Testing

Keywords

  • Lab-on-Chip (LoC)
  • Magnetic microbeads
  • Magnetic separator
  • Microfluidics
  • Trapping efficiency

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

Cite this

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abstract = "Lab-on-Chip (LoC) magnetic separation is a simple and effective method in separating bioparticles labelled with magnetic microbeads in microfluidics flow condition. In this work, trapping efficiency of magnetic microbeads using LoC magnetic separator and a microfluidics channel with chamber design is determined. The polydimethylsiloxane (PDMS) microfluidics channel was designed with an inlet, an outlet and a circular trapping chamber at the center. Standard soft lithography technique was used to replicate the PDMS microfluidics channel from the SU-8 mould. In a continuous hydrodynamics flow of 1.0 μL/min, trapping efficiency of 99.5 {\%} and 94.9 {\%} for 4.5 μm and 2.5 μm magnetic microbeads respectively was achieved. Flow analysis using COMSOL Multiphysics has been conducted in predicting the possible location of the magnetic beads trapping inside the microfluidics channel. The trapping is possible whenever the magnetic force is larger than the drag force experience by the magnetic microbead. The microfluidics channel with chamber design had facilitated low hydrodynamics drag force on the magnetic beads and resulted high efficiency trapping. Therefore, the development of this LoC magnetic separator may be promising to be utilized for biological studies and point-of-care testing (POCT) applications.",
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AB - Lab-on-Chip (LoC) magnetic separation is a simple and effective method in separating bioparticles labelled with magnetic microbeads in microfluidics flow condition. In this work, trapping efficiency of magnetic microbeads using LoC magnetic separator and a microfluidics channel with chamber design is determined. The polydimethylsiloxane (PDMS) microfluidics channel was designed with an inlet, an outlet and a circular trapping chamber at the center. Standard soft lithography technique was used to replicate the PDMS microfluidics channel from the SU-8 mould. In a continuous hydrodynamics flow of 1.0 μL/min, trapping efficiency of 99.5 % and 94.9 % for 4.5 μm and 2.5 μm magnetic microbeads respectively was achieved. Flow analysis using COMSOL Multiphysics has been conducted in predicting the possible location of the magnetic beads trapping inside the microfluidics channel. The trapping is possible whenever the magnetic force is larger than the drag force experience by the magnetic microbead. The microfluidics channel with chamber design had facilitated low hydrodynamics drag force on the magnetic beads and resulted high efficiency trapping. Therefore, the development of this LoC magnetic separator may be promising to be utilized for biological studies and point-of-care testing (POCT) applications.

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