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Microfluidic Mixers for Studying Protein Folding
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PDMS-based turbulent microfluidic mixer.

Jae Bem You1, Kyowon Kang, Thanh Tinh Tran

  • 1Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea 305-701. sgim@kaist.ac.kr.

Lab on a Chip
|February 12, 2015
PubMed
Summary
This summary is machine-generated.

This study presents a novel Y-shaped turbulent microfluidic mixer for rapid, homogeneous mixing. The device operates at high flow rates, enabling efficient emulsion formation and increasing microfluidic reactor throughput.

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Area of Science:

  • Microfluidics
  • Chemical Engineering
  • Materials Science

Background:

  • Homogeneous mixing in microfluidic devices is challenging due to low flow rates.
  • Existing mixers often require complex fabrication and struggle with high pressures.
  • Poly(dimethylsiloxane) (PDMS)-based devices are common but limited in high-flow applications.

Purpose of the Study:

  • To develop a robust, high-throughput turbulent microfluidic mixer.
  • To overcome fabrication limitations of existing microfluidic mixers.
  • To achieve rapid fluid mixing and enhanced emulsion formation.

Main Methods:

  • Fabrication of a Y-shaped microfluidic mixer using PDMS and a glass substrate.
  • Utilizing a nanoadhesive layer for strong substrate bonding via initiated chemical vapor deposition.
  • Operation at high flow rates (up to 40 mL/min) to induce turbulence (Re ~4423).

Main Results:

  • The developed mixer enables safe operation at high flow rates, inducing turbulence.
  • Rapid mixing of input fluids was observed immediately upon introduction.
  • Experimental results validated numerical predictions, showing dominant convective mixing due to turbulence.
  • High throughput formation of emulsions with narrower size distributions was achieved.

Conclusions:

  • The nanoadhesive-bonded PDMS/glass mixer facilitates high-Reynolds-number flow and rapid mixing.
  • Increased flow rates lead to smaller emulsion size distributions due to turbulent energy dissipation.
  • This turbulent microfluidic mixer enhances mixing speed and microfluidic reactor throughput.