What forces are used in AFM measurements?

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SUMMARY

Atomic Force Microscopy (AFM) techniques measure various interaction forces, including Van der Waals forces, electrostatic forces, and capillary forces. Additionally, chemical bonding can be assessed in specific experiments, such as protein unfolding. Specialized cantilevers enable the measurement of electrostatic and magnetic forces through techniques like Electrostatic Force Microscopy (EFM) and Magnetic Force Microscopy (MFM). Understanding these forces is crucial for accurate AFM measurements and applications.

PREREQUISITES
  • Familiarity with Atomic Force Microscopy (AFM) principles
  • Understanding of Van der Waals forces
  • Knowledge of electrostatic interactions
  • Basic concepts of chemical bonding in materials
NEXT STEPS
  • Research the principles of Electrostatic Force Microscopy (EFM)
  • Explore Magnetic Force Microscopy (MFM) techniques
  • Study the role of capillary forces in AFM measurements
  • Investigate the impact of chemical bonding on material properties
USEFUL FOR

Researchers and professionals in materials science, nanotechnology, and surface analysis who are involved in AFM measurements and the study of interaction forces at the nanoscale.

philip041
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I am asked 'name 3 example of interactions that can be measured by AFM techniques', then followed by 'name 3 examples of the types of interaction forces that are measured with AFM'.

1) Aren't interactions kinda the same as interaction forces?

2) I thought there is only one force, van de Waals, and that the interaction is that of dipoles interacting with each other, what are the other two or am I missing something deeper?

Cheers
 
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With a regular AFM you will usually have Van der Waals forces but also electrostatic forces if there is free charge on the surface (or cantilever), capillary forces from the water (or other liquids) and you may have chemical bonding (lik ein protein unfolding experiments).

By using specially designed cantilevers you can measure electrostatic and magnetic forces too (EFM and MFM).
 

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