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Local dynamic mechanical analysis for heterogeneous soft matter using ferrule-top indentation.

Hedde van Hoorn1, Nicholas A Kurniawan2, Gijsje H Koenderink3

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A novel nanoindentation technique precisely measures soft tissue viscoelasticity. This method accurately quantifies local mechanical properties, aiding disease diagnosis and cellular studies.

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Area of Science:

  • Biophysics
  • Materials Science
  • Biotechnology

Background:

  • Soft tissue mechanics are crucial for understanding diseases like arthritis and cellular responses.
  • Current nanoindentation methods face challenges in quantifying heterogeneous viscoelastic properties of hydrated biological tissues.
  • Accurate measurement of tissue mechanics at relevant biological length and time scales is needed.

Purpose of the Study:

  • To develop and validate a new nanoindentation approach for probing the viscoelastic properties of soft, hydrated tissues.
  • To enable precise quantification of local elastic and viscous moduli in biological samples.
  • To provide a tool for mapping spatial variations in mechanical properties of soft matter.

Main Methods:

  • Developed a ferrule-top probe utilizing a Fabry-Pérot cavity for all-optical detection of cantilever deflection and piezoelectric actuation.
  • Employed wavelength modulation to control static load and superposed oscillatory load for dynamic mechanical property extraction.
  • Validated the technique using silicone elastomers with known mechanical properties.

Main Results:

  • The technique accurately determines elastic and viscous moduli over a wide range (0.1–100 kPa) and frequency range (0.01–10 Hz).
  • Results showed excellent quantitative agreement with macroscopic rheology measurements without fitting parameters.
  • Demonstrated high sensitivity for mapping significant spatial variations (orders of magnitude) in mechanical properties across soft sample surfaces.

Conclusions:

  • The developed all-optical nanoindentation method offers a robust solution for measuring soft tissue viscoelasticity.
  • This technique facilitates accurate, spatially resolved characterization of dynamic mechanical properties in biological soft matter.
  • The approach holds significant potential for disease diagnostics and fundamental research in cellular mechanics.