Atomic Force Interaction
Atomic Force Interaction - Related Videos
03:04
Atomic Force Microscopy to Visualize Phage–Antigen Interactions
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2026
Source: Williams, S. M. et al. Novel Atomic Force Microscopy Based Biopanning for Isolation of Morphology Specific Reagents against TDP-43 Variants in Amyotrophic Lateral Sclerosis. J. Vis. Exp. (2015)This video demonstrates tapping-mode AFM to visualize phage–antigen interactions on a mica surface. It outlines the steps for antigen immobilization, phage binding, and high-resolution nanoscale imaging.
06:45
Force Spectroscopy of Single Protein Molecules Using an Atomic Force Microscope
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Cited by 4 •
2019
We describe the detailed procedures and strategies to measure the mechanical properties and mechanical unfolding pathways of single protein molecules using an atomic force microscope. We also show representative results as a reference for selection and justification of good single protein molecule recordings.
10:03
Bacterial Immobilization for Imaging by Atomic Force Microscopy
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Cited by 36 •
2011
Live Gram-negative and Gram-positive bacteria can be immobilized on gelatin-coated mica and imaged in liquid using Atomic Force Microscopy (AFM).
10:15
Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
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Cited by 34 •
2015
We describe a protocol for preparation of supported lipid bilayers and its characterization using atomic force microscopy and force spectroscopy.
05:09
Static Atomic Force Microscopy to Visualize and Characterize Assembled Nucleosomes
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2025
In this video, we demonstrate static atomic force microscopy to visualize assembled nucleosomes. This high-resolution imaging technique allows the study of the nucleosome structure.
FAQs
Atomic force interaction changes markedly with separation. At larger nanoscale gaps, van der Waals attraction can contribute, whereas bringing atoms, molecules, surfaces, or a probe much closer can make short-range electron-cloud repulsion important. Because the strength is distance-dependent, measurements can distinguish regions where attraction, repulsion, or their combined effect dominates.
These mechanisms provide different contributions to the net interaction between a probe and a sample or between surfaces. Van der Waals forces produce attraction, electrostatic effects reflect electrical interactions, and chemical bonding can connect the interaction to surface composition. Their relative influence varies with separation, environment, and the materials involved.
Electron-cloud repulsion becomes significant when interacting atoms, molecules, surfaces, or a probe approach very closely. It changes the net force from predominantly attractive to strongly repulsive over a short range. This distinction matters in physics because the measured interaction depends not only on which materials meet, but also on how closely their electron clouds approach.
In atomic force microscopy, a sharp tip interacts with the sample while attached to a flexible cantilever. The interaction produces cantilever deflection or changes in its oscillation. Researchers use these mechanical responses to map surface topography and material properties at high resolution, linking a nanoscale force response to observable spatial variations across the sample.
A sharp nanoscale probe is positioned to sense a sample, and the instrument monitors how the flexible cantilever responds. Changes in deflection or oscillation reflect variations in the interaction as the probe encounters different surface regions. Interpreting those responses produces maps of topography or material properties rather than relying only on visual surface inspection.
The study supports several connected areas, including nanotechnology, materials science, and surface chemistry. It also informs the design of sensors and functional devices, where interactions at small scales can affect performance. In physics, the approach is valuable because it connects force mechanisms, surface composition, environmental conditions, and nanoscale measurements in a single research context.