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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

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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Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid
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Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid

Published on: December 20, 2016

Imaging surface nanobubbles at graphite-water interfaces with different atomic force microscopy modes.

Chih-Wen Yang1, Yi-Hsien Lu, Ing-Shouh Hwang

  • 1Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan, Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 20, 2013
PubMed
Summary
This summary is machine-generated.

Atomic force microscopy (AFM) reveals frequency-modulation mode offers accurate nanobubble height measurements on graphite surfaces. High peak forces in PeakForce mode do not remove nanobubble gas, supporting a gas aggregate model for nanobubble stability.

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Area of Science:

  • Surface science
  • Nanotechnology
  • Microscopy

Background:

  • Surface nanobubbles are intriguing phenomena with high stability and contact angles.
  • Understanding their properties requires precise imaging techniques.

Purpose of the Study:

  • To compare atomic force microscopy (AFM) modes for imaging nanobubbles on highly ordered pyrolytic graphite (HOPG).
  • To investigate the influence of imaging parameters on nanobubble morphology and stability.
  • To evaluate existing nanobubble models based on experimental observations.

Main Methods:

  • Imaging nanobubbles on HOPG in pure water using AFM in frequency-modulation, tapping, and PeakForce modes.
  • Analyzing nanobubble height, size, and stability under varying peak force conditions.

Main Results:

  • Frequency-modulation AFM provided larger height values, indicating more accurate nanobubble profiling.
  • PeakForce mode imaging showed apparent size changes with peak force, but no permanent gas removal.
  • The gas aggregate model effectively explains nanobubble stability and contact angles.

Conclusions:

  • Frequency-modulation AFM is superior for precise nanobubble height measurements.
  • Nanobubble stability is not compromised by high peak forces during AFM imaging.
  • The gas aggregate model offers a robust explanation for surface nanobubble characteristics.