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Updated: May 19, 2026

Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Stochastic optical active rheology.

Hyungsuk Lee, Yongdae Shin, Sun Taek Kim

    Applied Physics Letters
    |August 16, 2012
    PubMed
    Summary
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    This study introduces a novel optical tweezers method for rapid rheology measurements. It effectively analyzes viscoelastic properties and force-induced changes in biological interactions.

    Area of Science:

    • Biophysics
    • Materials Science
    • Rheology

    Background:

    • Active rheology is crucial for understanding material properties.
    • Optical tweezers offer precise manipulation of microscopic objects.

    Purpose of the Study:

    • To develop a rapid, stochastic method for active rheology.
    • To measure frequency-dependent shear moduli.
    • To investigate viscoelastic properties and cell-surface interactions.

    Main Methods:

    • Utilizing optical tweezers to apply stochastic forces to embedded particles.
    • Monitoring particle displacement to calculate shear moduli.
    • Combining rheology with fluorescence imaging for biological studies.

    Main Results:

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    Calibration Procedures for Orthogonal Superposition Rheology
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    Calibration Procedures for Orthogonal Superposition Rheology

    Published on: November 18, 2020

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    Last Updated: May 19, 2026

    Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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    Calibration Procedures for Orthogonal Superposition Rheology
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    Published on: November 18, 2020

    • Achieved rapid estimation of frequency-dependent shear moduli (10^-1–10^3 Hz).
    • Probed linear viscoelastic properties of hydrogels with varying cross-linker concentrations.
    • Demonstrated force-induced, non-linear changes in T cell receptor-antigenic peptide bond strength.

    Conclusions:

    • The stochastic optical tweezers method provides a fast and effective approach for rheological characterization.
    • This technique is valuable for studying both material science and biophysical phenomena, including cell activation.