Probing viscoelastic response of soft material surfaces at the nanoscale.
basic_science · Level V
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- Record sourced from PubMed, PMID 26479475.
- Also identified by DOI 10.1039/c5sm02154e.
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Abstract
We study the interaction between an AFM tip and a soft viscoelastic surface. Using a multifrequency method we measure the amplitude-dependence of the cantilever dynamic force quadratures, which clearly show the effect of finite relaxation time of the viscoelastic surface. A model is introduced which treats the tip and surface as a two-body dynamic problem with a nonlinear interaction depending on their separation. We find good agreement between simulations of this model and experimental data on polymer blend samples for a variety of materials and measurement conditions.