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Related Experiment Video

Updated: May 28, 2026

Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions
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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

Published on: April 19, 2018

Interface shear microrheometer with an optically driven oscillating probe particle.

Chang Young Park1, H Daniel Ou-Yang, Mahn Won Kim

  • 1Department of Physics, KAIST, Daejeon 305-701, South Korea. cypark0411@gmail.com

The Review of Scientific Instruments
|October 7, 2011
PubMed
Summary
This summary is machine-generated.

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This study introduces a novel active interfacial shear microrheometer (ISMR) using oscillating optical tweezers (OT) for precise gas/liquid interface measurements. The ISMR offers high sensitivity and measures both real and imaginary shear modulus components without Kramers-Kronig limitations.

Area of Science:

  • Physical Chemistry
  • Materials Science
  • Biophysics

Background:

  • Characterizing interfacial rheology is crucial for understanding complex fluids.
  • Existing microrheology methods face limitations in sensitivity and applicability at low frequencies.

Purpose of the Study:

  • To experimentally demonstrate a novel active interfacial shear microrheometer (ISMR).
  • To showcase the advantages of oscillating optical tweezers (OT) for interfacial rheology.
  • To probe interfacial shear modulus in challenging systems.

Main Methods:

  • Utilizing a particle trapped by oscillating optical tweezers (OT) as the probe.
  • Measuring the complex shear modulus G(s)(*)(ω) of gas/liquid interfaces.
  • Applying the ISMR to a lipid monolayer and a composite interface.

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Fabrication and Testing of Microfluidic Optomechanical Oscillators

Published on: May 29, 2014

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Last Updated: May 28, 2026

Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions
11:38

Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

Published on: April 19, 2018

Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Published on: April 25, 2019

Fabrication and Testing of Microfluidic Optomechanical Oscillators
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Fabrication and Testing of Microfluidic Optomechanical Oscillators

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Main Results:

  • Achieved the first experimental demonstration of an active ISMR.
  • Demonstrated high sensitivity and ability to measure both real and imaginary shear modulus components.
  • Successfully probed interfacial rheology in regimes inaccessible to other active instruments.

Conclusions:

  • The developed ISMR provides a highly sensitive and versatile tool for interfacial rheology.
  • Oscillating OT overcomes limitations of passive methods, especially at low frequencies.
  • The ISMR is effective for studying complex interfacial phenomena in various systems.