论文标题
使用修改后的傅立叶变换直接测量AFM力距离实验中的存储和损耗行为
Direct Measurement of Storage and Loss Behavior in AFM Force-Distance Experiments Using the Modified Fourier Transformation
论文作者
论文摘要
力距离曲线实验通常在原子力显微镜（AFM）中进行，以获得材料的粘弹性特征，例如存储和损失模量或合规性。用于获得这些特征的经典方法包括将粘弹性材料模型拟合到实验获得的AFM数据中。在这里，我们演示了一种新方法，该方法利用修改的离散傅立叶变换，直接从数据中直接从数据中近似材料的存储和损失行为，而无需拟合。此外，如果需要对材料的参数化描述，则仍然可以将模型符合产生的存储和损失行为。与将数据拟合到选择的模型相反，与对材料频率行为的无模型描述不同，可以指导模型的选择，以便用户可以选择最适合于研究的特定材料的模型。为此，我们还包括了常用粘弹性模型的修改后的傅立叶域描述。
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.
