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A Microfluidic Concentration Gradient Maker with Tunable Concentration Profiles by Changing Feed Flow Rate Ratios.

Tao Zhang1, Jiyu Meng1, Shanshan Li1,2

  • 1Hebei Key Laboratory of Robotic Sensing and Human-robot interactions, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300132, China.

Micromachines
|March 14, 2020
PubMed
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Researchers developed a microfluidic platform for generating diverse concentration profiles using a single device. This feed flow rate ratio (FFRR) approach offers precise control for drug release and toxicology studies.

Area of Science:

  • Microfluidics
  • Biotechnology
  • Chemical Engineering

Background:

  • Microfluidic chips are crucial for creating concentration distribution profiles in fluid samples.
  • These devices hold significant potential for drug release patterning and toxicology applications.
  • Current microfluidic devices have limitations in varying concentration patterns within a single unit.

Purpose of the Study:

  • To develop a versatile microfluidic platform capable of generating multiple concentration profiles from a single device.
  • To introduce a novel feed flow rate ratio (FFRR) adjustment approach for precise control over concentration patterns.
  • To demonstrate the efficacy of this platform for lab-on-a-chip applications requiring flexible concentration gradients.

Main Methods:

  • Fabrication of a microfluidic platform using soft-lithography.
Keywords:
concentration gradientfeed flow rate ratios mixingmicrofluidicsnonlinear

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  • Implementation of an FFRR adjustment approach to control fluid flow rates from independent inlets.
  • Utilizing a Christmas-tree-like microfluidic chip design for demonstration.
  • Analysis through numerical simulation models and experimental investigations.

    • Main Results:

    • The developed microfluidic platform can generate linear, bell-type, and S-type concentration profiles.
    • The FFRR approach enables the creation of tens of different concentration gradient profiles using one device.
    • The system demonstrated an excellent time response of approximately 10 seconds.
    • Numerical simulations and experimental results validated the platform's performance.

    Conclusions:

    • The FFRR microfluidic device offers a flexible and efficient method for generating diverse concentration profiles.
    • This platform addresses the need for on-demand concentration gradient generation in microfluidic systems.
    • The technology is well-suited for various lab-on-a-chip applications, particularly in drug development and toxicology.
    • The ability to tune concentration patterns within a single device enhances experimental reproducibility and efficiency.