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Updated: Nov 22, 2025

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A dynamically deformable microfilter for selective separation of specific substances in microfluidics.

Seitaro Kumamoto, Kenshiro Nakatake1, Souichiro Fukuyama1

  • 1Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan.

Biomicrofluidics
|January 11, 2021
PubMed
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A novel 3D-deformable dynamic microfilter selectively separates substances from solutions. This microfilter uses adjustable pressure and elastic deformation for precise filtration, showing potential for isolating specific cells.

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Biotechnology

Background:

  • Separating constituents from environmental or biological solutions is crucial for analysis.
  • Existing filtration methods may lack the specificity or adaptability required for complex mixtures.

Purpose of the Study:

  • To develop and evaluate a 3D-deformable dynamic microfilter for selective substance separation.
  • To investigate the relationship between fluid dynamics and microfilter deformation for optimized filtration.

Main Methods:

  • Fabrication of a metallic nickel microfilter using photolithography and electroplating.
  • Gold coating and creation of micro-slits (10-20 μm width).
  • Utilizing hydrodynamic forces to induce 3D deformation and adjusting pressure to control gap size.

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Main Results:

  • Demonstrated selective isolation of target substances via elastic deformation.
  • Established a correlation between solution flow rate and microfilter deformation.
  • Achieved selective cell isolation by modifying the microfilter surface with nucleic acid aptamers.

Conclusions:

  • The 3D-deformable dynamic microfilter effectively separates target substances from solutions.
  • The microfilter's tunable deformation allows for precise control over filtration parameters.
  • Surface functionalization with aptamers enhances selectivity for specific cell isolation, highlighting broad application potential.