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Remote Magnetic Actuation of Micrometric Probes for in situ 3D Mapping of Bacterial Biofilm Physical Properties

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Mixed motion in deterministic ratchets due to anisotropic permeability.

T Kulrattanarak¹, R G M van der Sman, Y S Lubbersen

¹Food Process Engineering Group, Wageningen University, P.O. Box 8129, 6700EV Wageningen, The Netherlands.

Journal of Colloid and Interface Science

|December 7, 2010

Summary

Deterministic ratchets in microfluidic devices show a newly discovered "mixed motion" behavior. This particle behavior is linked to anisotropic permeability in obstacle arrays, advancing cell and DNA fractionation techniques.

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Area of Science:

Biotechnology
Microfluidics
Particle Physics

Background:

Microfluidic devices are increasingly used for cell and DNA sorting.
Deterministic ratchets are a promising microfluidic technology for continuous fractionation.
Existing research identifies zigzag and displacement as primary particle motion types.

Purpose of the Study:

To investigate a newly observed intermediate particle behavior, termed 'mixed motion'.
To hypothesize and test the correlation between 'mixed motion' and anisotropy in microfluidic device permeability.

Main Methods:

Experimental observation of particle behavior in microfluidic devices.
Two-dimensional (2-D) flow simulations to analyze flow lane distribution.
Comparison of experimental data with simulation results.

Main Results:

Identification and characterization of 'mixed motion' as a distinct particle behavior.
Correlation observed between the occurrence of 'mixed motion' and anisotropic permeability in the obstacle array.
Flow lane distribution analysis supports the hypothesis.

Conclusions:

The 'mixed motion' behavior in deterministic ratchets is hypothesized to be linked to anisotropic permeability.
This finding offers new insights into particle behavior within microfluidic sorting devices.
Further research can leverage this understanding for improved cell and DNA fractionation.