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Related Experiment Video

Updated: Jun 5, 2026

Lensless Fluorescent Microscopy on a Chip
11:23

Lensless Fluorescent Microscopy on a Chip

Published on: August 17, 2011

Microfluidic on-chip fluorescence-activated interface control system.

Li Haiwang, N T Nguyen, T N Wong

    Biomicrofluidics
    |December 22, 2010
    PubMed
    Summary
    This summary is machine-generated.

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    A novel microfluidic system uses fluorescence and a high-voltage feedback loop to precisely control liquid interfaces in lab-on-a-chip devices. This dynamic control enables real-time manipulation of fluid streams for automated sample handling.

    Area of Science:

    • Microfluidics
    • Analytical Chemistry
    • Biotechnology

    Background:

    • Lab-on-a-chip (LOC) devices require precise control over fluid interfaces.
    • Existing methods for interface control can be complex and lack real-time adjustability.

    Purpose of the Study:

    • To develop a microfluidic dynamic fluorescence-activated interface control system for LOC applications.
    • To achieve automatic and real-time control of liquid-liquid interfaces within microchannels.

    Main Methods:

    • A system comprising a microchannel, fluorescence detection, and a high-voltage feedback loop was designed.
    • Aqueous NaCl (conducting) and glycerol (nonconducting) fluids were used, with fluorescent dye in NaCl to track the interface.
    • Electroosmotic effects in the conducting fluid were manipulated via a LABVIEW-controlled high-voltage system.

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    Published on: December 10, 2011

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    Automated System for Single Molecule Fluorescence Measurements of Surface-immobilized Biomolecules
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    Main Results:

    • The system successfully achieved automatic, real-time control of arbitrary liquid interface positions.
    • Demonstrated the ability to move the interface to a desired location using feedback control.
    • Investigated the influence of viscosity ratio, flow rates, and electric field polarity on interface control.

    Conclusions:

    • The developed fluorescence-activated system offers precise and dynamic control of microfluidic interfaces.
    • This technique has potential applications in automated sample switching and droplet manipulation in LOC devices.