Zusammenfassung
We propose an analytical model for the force-indentation relationship in
viscoelastic materials exhibiting a power law relaxation described by an exponent n, where n = 1 represents the standard viscoelastic solid (SLS)
model and n<1 represents a fractional SLS model. To validate the model,
we perform nanoindentation measurements of polyacrylamide gels with
atomic force microscopy (AFM) force curves. We found exponents n<1 that
depend on the bisacrylamide concentration. We also demonstrate that the
fitting of AFM force curves for varying load speeds can reproduce the
dynamic viscoelastic properties of those gels measured with dynamic
force modulation methods. Published by AIP Publishing.
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