Spatially resolved frequency-dependent elasticity measured with pulsed force microscopy and nanoindentation

Nanoscale
Kim SweersVinod Subramaniam

Abstract

Recently several atomic force microscopy (AFM)-based surface property mapping techniques like pulsed force microscopy (PFM), harmonic force microscopy or Peakforce QNM® have been introduced to measure the nano- and micro-mechanical properties of materials. These modes all work at different operating frequencies. However, complex materials are known to display viscoelastic behavior, a combination of solid and fluid-like responses, depending on the frequency at which the sample is probed. In this report, we show that the frequency-dependent mechanical behavior of complex materials, such as polymer blends that are frequently used as calibration samples, is clearly measurable with AFM. Although this frequency-dependent mechanical behavior is an established observation, we demonstrate that the new high frequency mapping techniques enable AFM-based rheology with nanoscale spatial resolution over a much broader frequency range compared to previous AFM-based studies. We further highlight that it is essential to account for the frequency-dependent variation in mechanical properties when using these thin polymer samples as calibration materials for elasticity measurements by high-frequency surface property mapping techniques. These resul...Continue Reading

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Citations

May 1, 2013·Physical Chemistry Chemical Physics : PCCP·J Landoulsi, V Dupres
Jan 10, 2016·Breast Cancer Research : BCR·James C McConnellCharles H Streuli
Dec 2, 2017·Advanced Healthcare Materials·Pranjal NautiyalArvind Agarwal
Apr 7, 2015·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Davide A D CassaniFabio Variola

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