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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
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Atomic Force Microscopy Cantilever-Based Nanoindentation: Mechanical Property Measurements at the Nanoscale in Air and Fluid
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Modeling atomic force microscopy and shell mechanical properties estimation of coated microbubbles.

A Lytra1, V Sboros2, A Giannakopoulos3

  • 1Department of Mechanical Engineering, University of Thessaly, Volos, 38334, Greece. pel@uth.gr.

Soft Matter
|May 12, 2020
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Summary
This summary is machine-generated.

This study models coated microbubbles (MBs) using atomic force microscopy (AFM) data. The model accurately predicts MB mechanical responses, differentiating between polymer and lipid coatings, aiding in elastic property estimation.

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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
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Area of Science:

  • Biophysics
  • Materials Science
  • Nanotechnology

Background:

  • Coated microbubbles (MBs) are utilized in various biomedical applications, necessitating a thorough understanding of their mechanical properties.
  • Atomic Force Microscopy (AFM) provides a powerful tool for probing the mechanical response of microscale objects like MBs.
  • Existing models often lack the comprehensive approach to capture the complex behaviors of different MB coatings under compression.

Purpose of the Study:

  • To develop and validate a theoretical/numerical model for the static response of coated MBs under AFM compression.
  • To investigate the distinct mechanical behaviors of polymer-coated and lipid monolayer-coated MBs.
  • To establish methods for estimating the elastic properties of MB coatings based on experimental force-deformation data.

Main Methods:

  • A theoretical/numerical model was developed, incorporating elastic thin shell theory for MB mechanics.
  • The encapsulated fluid was treated as compressible/incompressible, and liquid film thinning was modeled using an interaction potential and disjoining pressure.
  • The model's predictions were extensively compared with experimental force-deformation (f-d) curves obtained from AFM experiments.

Main Results:

  • For polymer-coated MBs, the model accurately reproduced the initial linear (Reissner regime) and subsequent non-linear buckling (Pogorelov regime) observed in experiments.
  • For lipid monolayer-coated MBs, the model captured the transition from the Reissner regime to a pressure-dominated regime, bypassing buckling.
  • The model enabled the estimation of elastic properties (Young's modulus, shell thickness, area dilatation, and bending moduli) for both coating types, showing satisfactory to excellent agreement with experimental data.

Conclusions:

  • The developed theoretical/numerical model provides a robust framework for analyzing the mechanical response of coated MBs under AFM compression.
  • Distinct buckling behaviors differentiate polymer-coated and lipid monolayer-coated MBs, offering insights into their structural mechanics.
  • The model facilitates accurate estimation of key elastic parameters, crucial for optimizing MBs in diverse applications.