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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...
4.3K

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Related Experiment Video

Updated: Jan 6, 2026

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

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Nanofluidic chromatography using a vibrating atomic force microscope tip.

Mark S Anderson1

  • 1Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, M/S 125-109, Pasadena, California 91109, USA.

The Review of Scientific Instruments
|October 3, 2019
PubMed
Summary
This summary is machine-generated.

Atomic Force Microscope (AFM) tapping mode separates liquid mixtures at the nanoscale. This method enhances molecular partitioning for ultratrace analysis and nanofluidic applications.

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Area of Science:

  • Nanotechnology
  • Analytical Chemistry
  • Physical Chemistry

Background:

  • Liquid mixture separation is crucial for various scientific and industrial applications.
  • Conventional separation techniques often face limitations in sensitivity and scale.
  • Nanoscale separation methods offer potential for enhanced precision and efficiency.

Purpose of the Study:

  • To demonstrate the efficacy of Atomic Force Microscope (AFM) tapping mode for liquid mixture separation.
  • To investigate the mechanism of separation based on molecular affinity to the AFM tip.
  • To explore the application of this technique for ultratrace analysis and nanofluidics.

Main Methods:

  • Utilizing the vibrating tip of an AFM in tapping mode to collect fluid from liquid surfaces.
  • Suppressing bulk capillary flow to enhance separation based on molecular interactions.
  • Analyzing separated components using tip-enhanced infrared spectroscopy and direct analysis in real-time mass spectrometry.

Main Results:

  • Successful separation of components from binary and complex liquid mixtures was achieved.
  • The AFM tapping mode demonstrated effective partitioning based on molecular affinity.
  • Nanometer-scale chemical separation was validated through spectroscopic and mass spectrometry analysis.

Conclusions:

  • AFM tapping mode is a viable technique for nanoscale liquid mixture separation.
  • This method provides a novel approach for ultratrace chemical analysis.
  • The findings open new avenues for nanofluidic device development and applications.