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Measuring the Mechanical Properties of Living Cells Using Atomic Force Microscopy

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Viscoelastic property mapping with contact resonance force microscopy.

J P Killgore¹, D G Yablon, A H Tsou

¹National Institute of Standards and Technology, Boulder, Colorado 80305, USA.

Langmuir : the ACS Journal of Surfaces and Colloids

|November 8, 2011

Summary

Contact resonance force microscopy accurately maps nanoscale viscoelastic properties of polymer blends. Results align with dynamic mechanical analysis, validating the technique for material characterization.

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Area of Science:

Materials Science
Polymer Science
Nanotechnology

Background:

Understanding near-surface viscoelastic properties is crucial for polymer blend performance.
Traditional methods often lack the nanoscale resolution required for detailed characterization.

Purpose of the Study:

To demonstrate accurate nanoscale mapping of viscoelastic properties (loss and storage moduli) in a polystyrene-polypropylene blend.
To evaluate two data acquisition methods: discrete stepping and continuous scanning.

Main Methods:

Utilized contact resonance force microscopy (CR-FM) to probe viscoelasticity.
Extracted spatially resolved maps of contact resonance frequency and quality factor from the AFM cantilever.
Compared CR-FM data with dynamic mechanical analysis (DMA) measurements.

Main Results:

Achieved accurate nanoscale mapping of near-surface loss and storage moduli.
Demonstrated good agreement between CR-FM and time-temperature superposition of DMA for point mapping and low-speed scanning.
Validated the ability to correlate low-frequency DMA with high-frequency CR-FM measurements.

Conclusions:

CR-FM is a powerful technique for nanoscale viscoelastic property mapping of polymer blends.
The data acquisition method impacts the accuracy and agreement with lower-frequency measurements.
CR-FM provides valuable insights into the heterogeneous mechanical behavior of polymer blends at the nanoscale.