Direct Measurement of Storage and Loss Behavior in AFM Force-Distance Experiments Using the Modified Fourier Transformation
Force-distance curve experiments are commonly performed in Atomic Force Microscopy (AFM) to obtain the viscoelastic characteristics of materials, such as the storage and loss moduli or compliances. The classic methods used to obtain these characteristics consist of fitting a viscoelastic material mo...
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Main Authors: | , , |
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Format: | Journal Article |
Language: | English |
Published: |
18-02-2022
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Subjects: | |
Online Access: | Get full text |
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Summary: | Force-distance curve experiments are commonly performed in Atomic Force
Microscopy (AFM) to obtain the viscoelastic characteristics of materials, such
as the storage and loss moduli or compliances. The classic methods used to
obtain these characteristics consist of fitting a viscoelastic material model
to the experimentally obtained AFM data. Here, we demonstrate a new method that
utilizes the modified discrete Fourier transform to approximate the storage and
loss behavior of a material directly from the data, without the need for a fit.
Additionally, one may still fit a model to the resulting storage and loss
behavior if a parameterized description of the material is desired. In contrast
to fitting the data to a model chosen a priori, departing from a model-free
description of the material's frequency behavior guides the selection of the
model, such that the user may choose the one that is most appropriate for the
particular material under study. To this end, we also include modified Fourier
domain descriptions of commonly used viscoelastic models. |
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DOI: | 10.48550/arxiv.2202.08945 |