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Related Concept Videos

Thermal Stress01:09

Thermal Stress

If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...

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Updated: May 28, 2026

Thermal Measurement Techniques in Analytical Microfluidic Devices
08:29

Thermal Measurement Techniques in Analytical Microfluidic Devices

Published on: June 3, 2015

Platform and Framework for Time-Resolved Nanoscale Thermal Transport Measurements in STEM.

Mairi McCauley1,2, Joel Martis3, Ondrej L Krivanek3

  • 1Department of Physics, Humboldt-Universität zu Berlin, 12489 Berlin, Germany.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|May 27, 2026
PubMed
Summary

Researchers developed a new method for measuring nanoscale thermal transport. This technique uses a laser-excitation system within a scanning transmission electron microscope to accurately determine thermal conductivity and heat capacity in materials.

Keywords:
electron energy-loss spectroscopyphononsthermal transporttransmission electron microscopy

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Published on: January 19, 2018

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Accurate nanoscale thermal transport measurements are crucial for advanced materials and devices.
  • Direct local measurements of thermal conductivity and heat capacity are limited.

Purpose of the Study:

  • To develop a novel technique for time-resolved nanoscale thermal transport measurements.
  • To enable local determination of thermal conductivity and heat capacity.

Main Methods:

  • Integration of a laser-excitation system into a scanning transmission electron microscope (STEM).
  • Utilizing ultrahigh-resolution electron energy-loss spectroscopy (EELS) for local temperature determination.
  • Employing a time-resolved heat diffusion model with radiative losses for parameter extraction.

Main Results:

  • Achieved temporal resolution of approximately 50 ns and energy resolution of <10 meV.
  • Successfully measured thermal conductivity (1.24 Wm⋅K) and heat capacity (821 Jkg⋅K) of amorphous carbon films.
  • Demonstrated the framework's capability for time-resolved nanoscale thermal transport analysis.

Conclusions:

  • The developed STEM-integrated laser system provides a powerful new tool for nanoscale thermal transport studies.
  • This method allows for precise, time-resolved characterization of thermal properties in materials and nanostructures.
  • The framework opens avenues for investigating thermal management in semiconductor devices and quantum materials.