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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
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Characterizing Multiscale Mechanical Properties of Brain Tissue Using Atomic Force Microscopy, Impact Indentation, and Rheometry
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Multiscale rheology from bulk to nano using a quartz tuning fork-atomic force microscope.

Jaewon Shim1, Chungman Kim1, Manhee Lee2

  • 1Center for 0D Nanofluidics, Institute of Applied Physics, Department of Physics and Astronomy, Seoul National University, Seoul 08826, South Korea.

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Summary

A novel atomic force microscope method measures rheology from nano to bulk scales. This reveals increased modulus near surfaces due to layered polymer structures in silicone oils.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Nanotechnology

Background:

  • Rheological properties differ significantly at the nanoscale compared to bulk.
  • A unified experimental approach is needed to understand rheology across multiple scales.

Purpose of the Study:

  • To develop a single experimental platform for multiscale rheology measurements.
  • To investigate rheological behavior from the nanoscale to the bulk scale.

Main Methods:

  • Utilized a quartz tuning fork (QTF) force sensor integrated with an atomic force microscope.
  • Employed microscale and nanoscale shear probes for tip-substrate rheological measurements with sub-nanometer resolution.
  • Calibrated the system using silicone oils of varying viscosities (5–10,000 cSt).

Main Results:

  • Successfully derived bulk rheological moduli for silicone oils.
  • Observed an increased modulus in the tribo-nanorheology regime (<50 nm from surface).
  • Confirmed this increase is attributed to the formation of layered silicone oil polymer structures.

Conclusions:

  • The developed QTF-based AFM provides a robust platform for multiscale rheology.
  • Demonstrated a transition in rheological behavior near surfaces due to structural changes.
  • Offers a comprehensive understanding of complex fluid tribo-rheology across scales.