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Integrated three-dimensional filter separates nanoscale from microscale elements in a microfluidic chip.

Lorenzo Amato1, Yu Gu, Nicola Bellini

  • 1Istituto di Fotonica e Nanotecnologie-CNR, Dipartimento di Fisica-Politecnico di Milano, Milan, Italy.

Lab on a Chip
|February 10, 2012
PubMed
Summary
This summary is machine-generated.

We developed a novel 3D microfluidic filter using two-photon polymerization. This reusable filter effectively separates 3 μm particles, demonstrating potential for applications like plasma separation without clogging.

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Area of Science:

  • Microfluidics
  • Materials Science
  • Biotechnology

Background:

  • Microfluidic devices are crucial for lab-on-a-chip applications.
  • Integrating functional components like filters into pre-sealed microfluidic chips presents challenges.
  • Existing filtration methods can suffer from clogging and limited reusability.

Purpose of the Study:

  • To develop and validate a novel size-based 3D filter integrated into a commercial microfluidic chip.
  • To demonstrate the filter's efficacy in particle separation and its potential for biological sample processing.
  • To assess the filter's operational stability, reusability, and resistance to clogging.

Main Methods:

  • Fabrication of a 3D filter with micrometer-sized pores within a sealed microfluidic channel using two-photon polymerization.
  • Post-processing integration of the filter into a standard microfluidic chip.
  • Testing the filter's performance using a suspension of 3 μm polystyrene spheres and Rhodamine 6G solution.
  • Preliminary validation using whole blood for plasma separation.

Main Results:

  • Achieved 100% retention of 3 μm polystyrene spheres while allowing fluorescent molecules to pass.
  • Demonstrated clog-free operation for up to 25 minutes.
  • Successfully performed preliminary plasma separation from whole blood.
  • Confirmed filter reusability by reversing flow direction.

Conclusions:

  • Two-photon polymerization enables effective post-processing integration of 3D microfluidic filters.
  • The developed filter shows high efficiency in particle separation and resistance to clogging.
  • The filter technology holds promise for various microfluidic applications, including biological sample preparation and analysis.