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Related Concept Videos

Transmission Electron Microscopy01:15

Transmission Electron Microscopy

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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Real-Time Observation of Polymer Fluctuations During Phase Transition Using Transmission Electron Microscope.

Takaaki Shiina1,2, Tatsunari Ohkubo1,2, Keegan McGehee1

  • 1AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO-OIL), National Institute of Advanced Industrial Science and Technology (AIST), 6-2-3 Kashiwanoha, Chiba 277-0882, Japan.

Polymers
|February 13, 2025
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Summary
This summary is machine-generated.

This study introduces a new transmission electron microscopy (TEM) method using gold nanoparticles to track polymer dynamics. This technique reveals material phase transitions through observed molecular motion.

Keywords:
in situ thermal controlmembrane dynamicsnano-particle trackingoperando measurementtransmission electron microscope

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Understanding material dynamics is crucial for structure-function relationships.
  • Transmission electron microscopy (TEM) offers high-resolution imaging capabilities.
  • Real-space observation of molecular motion in polymers is challenging.

Purpose of the Study:

  • To develop and validate a novel TEM-based technique for observing polymer dynamics.
  • To utilize gold nanoparticles as motion probes for real-space polymer analysis.
  • To investigate the dynamics of specific polymer materials, poly{2-(perfluorooctyl)ethyl acrylate} (PC8FA) and poly(stearyl acrylate) (PSA).

Main Methods:

  • A thin polymer layer was prepared on Quantifoil grids with 2 μm holes.
  • Gold nanoparticles were dispersed on the polymer membrane surface.
  • Continuous temperature control was applied during TEM imaging to track nanoparticle movement and calculate mean squared displacement (MSD) curves.

Main Results:

  • The movement of gold nanoparticles was successfully tracked via a series of TEM images.
  • Mean squared displacement (MSD) curves were generated to quantify polymer dynamics.
  • Sharp peaks in temperature-dependent MSD curves indicated melting and crystallization transitions for both PC8FA and PSA.

Conclusions:

  • The developed TEM technique effectively visualizes polymer dynamics in real space.
  • Gold nanoparticle tracking provides valuable insights into material phase transitions.
  • This method shows significant potential for broad applications in materials science research.