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The Microfluidic Probe: Operation and Use for Localized Surface Processing
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Systematic analysis of microfluidic probe design and operation.

Thomas Gervais, Mohammadali Safavieh, Mohammad A Qasaimeh

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |January 9, 2015
    PubMed
    Summary

    This study introduces a theoretical model for microfluidic probes, explaining hydrodynamic flow confinement (HFC) for precise reagent delivery. The model accurately predicts HFC extent, enabling controlled surface patterning and future automated probe operation.

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    Area of Science:

    • Fluid dynamics
    • Microfluidics
    • Surface science

    Background:

    • Microfluidic probes enable precise reagent delivery for applications like surface biopatterning and cell studies.
    • They utilize hydrodynamic flow confinement (HFC) by recirculating fluids between the probe and substrate.
    • Existing methods lack precise theoretical understanding of HFC extent.

    Purpose of the Study:

    • To develop and validate a theoretical model for predicting the hydrodynamic flow confinement (HFC) zone generated by microfluidic probes.
    • To analyze the impact of key operational parameters on HFC extent for two-aperture microfluidic probes (MFPs) and microfluidic quadrupoles (MQs).
    • To provide a foundation for precise control and automated calibration of microfluidic probes in surface patterning applications.

    Main Methods:

    • Development of a theoretical model based on 2D potential flow theory.
    • Numerical simulations to validate the theoretical model.
    • Experimental data collection to confirm model predictions.

    Main Results:

    • The theoretical model accurately describes the HFC extent for both MFPs and MQs.
    • Key parameters influencing HFC include the ratio of aspiration to injection flow rate and aperture distance.
    • The model provides insights for precise control of the probe's 'brush stroke' during surface patterning.

    Conclusions:

    • A simple yet accurate theoretical model explains microfluidic probe operation based on 2D potential flows.
    • The model enables precise prediction and control of hydrodynamic flow confinement.
    • This work lays the groundwork for computer-controlled calibration and operation of microfluidic probes.