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Updated: Apr 4, 2026
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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
Published on: July 22, 2015
15.6K
Multiscale Molecular Modeling to Reveal Interactions between the Atomic Force Microscopy Tip and Lipid Bilayer Stacks
Saswati Panda1, Yuqi Huang2, Gang-Yu Liu2
1Department of Materials Science and Engineering, University of California, Davis, California 95616, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|April 3, 2026
Summary
Understanding atomic force microscope (AFM) tip and lipid bilayer interactions is key for nanotech development. Simulations reveal layer-by-layer penetration mechanics, aiding in designing advanced lipid-based materials for delivery and sensing applications.
Area of Science:
- Biophysics
- Materials Science
- Nanotechnology
Background:
- Designing nanoscale lipid constructs requires understanding tip-lipid interactions.
- Atomic force microscopy (AFM) is crucial for probing molecular-level interactions.
Purpose of the Study:
- To develop a model elucidating the molecular mechanisms of AFM tip-lipid bilayer interactions.
- To investigate the complex forces governing tip penetration and bilayer disturbance.
Main Methods:
- Coarse-grained MARTINI molecular dynamics simulations were employed.
- Simulations focused on a multibilayer 1-palmitoyl-2-oleoylphosphatidylcholine (POPC) system and an AFM tip apex.
Main Results:
- Force-distance profiles exhibited a sawtooth pattern, correlating with bilayer thickness.
- Distinct features in force-distance traces corresponded to molecular events like climbing, adhesion, and compression.
- Mechanistic insights into layer-by-layer penetration were provided.
Conclusions:
- The study provides a detailed molecular understanding of AFM tip-lipid interactions.
- Outcomes support the development of engineered lipid-based materials for drug/vaccine delivery.
- Findings facilitate the fabrication of lipid-based nanodevices and biosensors.
