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Related Experiment Videos

Microfluidic sensor for dynamic surface tension measurement.

N-T Nguyen1, S Lassemono, F A Chollet

  • 1School of Mechanical & Aerospace Engineering, Nanyang Technological University, Nanyang Avenue 50, Singapore 639798. mntnguyen@ntu.edu.sg

IEE Proceedings. Nanobiotechnology
|September 5, 2006
PubMed
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A new microfluidic sensor accurately measures dynamic gas-liquid interfacial tension using bubble formation frequency. This innovative device requires minimal sample volume and can determine surfactant critical micelle concentration.

Area of Science:

  • Chemical Engineering
  • Materials Science
  • Analytical Chemistry

Background:

  • Interfacial tension is a critical parameter in multiphase systems.
  • Existing methods for measuring interfacial tension often require large sample volumes and are time-consuming.
  • Development of novel sensors for dynamic interfacial tension measurement is essential for various industrial applications.

Purpose of the Study:

  • To report a novel microfluidic sensor for dynamic gas-liquid interfacial tension measurement.
  • To demonstrate the sensor's ability to determine interfacial tension based on bubble formation frequency.
  • To evaluate the sensor's potential for identifying critical micelle concentration (CMC) of surfactants.

Main Methods:

  • Fabrication of a microfluidic chip with a microchannel network.

Related Experiment Videos

  • Integration of an optical detection system for monitoring bubble formation.
  • Controlled injection of sample and air at a fixed flow rate ratio.
  • Calibration of the sensor using a commercial tensiometer for aqueous solutions of cetyl trimethyl ammonium bromide (CTAB).

    • Main Results:

    • A clear relationship was established between surface tension and bubble formation frequency.
    • The sensor successfully measured interfacial tension for varying concentrations of CTAB.
    • The critical micelle concentration of CTAB was accurately identified using the developed sensor.

    Conclusions:

    • The microfluidic sensor provides a sensitive and efficient method for measuring dynamic gas-liquid interfacial tension.
    • The sensor's ability to use minute sample volumes offers a significant advantage over conventional methods.
    • This technology holds promise for applications requiring rapid and precise interfacial tension analysis.