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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 Imaging and Force Spectroscopy of Supported Lipid Bilayers
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Studying biological membranes with extended range high-speed atomic force microscopy.

Adrian P Nievergelt1, Blake W Erickson1, Nahid Hosseini1

  • 1Laboratory for Bio- and Nano-Instrumentation École Polytechnique Fédérale de Lausanne Batiment BM 3109 Station 17, 1015 Lausanne, Switzerland.

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Summary

High-speed atomic force microscopy (HS-AFM) can now image large biological samples like membranes using conventional instruments. A novel two-actuator scanner enables high-speed imaging and nanomechanical measurements on cells and membranes.

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Area of Science:

  • Nanotechnology
  • Biophysics
  • Surface Science

Background:

  • High-speed atomic force microscopy (HS-AFM) is crucial for nanoscale biomolecular studies.
  • Imaging larger biological specimens like membranes and cells with HS-AFM is challenging and often requires instrument modification.

Purpose of the Study:

  • To develop a method for high-speed AFM imaging of large biological samples using conventional AFM instrumentation with minimal alterations.
  • To achieve a large scan range in HS-AFM for studying complex biological systems.

Main Methods:

  • Implementation of a two-actuator design with adapted control systems for a 130 × 130 × 5 micrometer scanner.
  • Achieving a high open-loop small-signal Z-bandwidth of nearly 100 kHz.
  • Utilizing peak force tapping measurements at a 32 kHz peak force rate.

Main Results:

  • Successful implementation of a high-speed AFM system with a large scan range using conventional instrumentation.
  • Demonstration of real-time imaging of lipid membrane integrity changes caused by charged polymer nanoparticles.
  • High-speed nanomechanical surface property measurements at 32 kHz peak force rate.

Conclusions:

  • The developed system enables HS-AFM imaging and nanomechanical measurements on large biological samples without fundamental instrument redesign.
  • This advancement expands the applicability of HS-AFM to complex biological systems and dynamic processes.
  • The system facilitates real-time observation of nanoparticle-membrane interactions and material property analysis at high speeds.