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Heat transfer in metallic nanometre-sized gaps
Rubén López-Nebreda1, Oscar Mateos-Lopez2,3, Pablo Martinez Martinez2,3
1Departmento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Madrid, Spain.
Nature Communications
|August 9, 2025
Summary
Researchers resolved a controversy in nanoscale heat transfer by identifying water menisci as the cause of anomalous thermal signals in gold atomic contacts, not new physics.
Area of Science:
- Physics
- Materials Science
- Nanotechnology
Background:
- Heat transfer across nanoscale gaps is crucial for advanced technologies.
- Conflicting experimental results have raised questions about fundamental heat exchange mechanisms at the nanoscale.
Purpose of the Study:
- To resolve discrepancies in experimental findings regarding heat transfer in nanoscale gaps.
- To investigate the thermal conductance of gold atomic-sized contacts.
Main Methods:
- Utilized a custom scanning tunneling microscope with a novel thermal probe.
- Measured both thermal and electrical conductance across varying gap sizes.
- Employed non-equilibrium molecular dynamics simulations.
Main Results:
- Observed anomalous thermal signals in nanometre-sized gaps that standard models could not explain.
- Identified thermal conduction through water menisci as the source of these signals.
- Demonstrated that water menisci form under typical experimental conditions.
Conclusions:
- The study resolves the puzzle of anomalous heat transfer in nanoscale gaps.
- Water menisci play a significant role in heat conduction in atomic and molecular junctions.
- Opens new pathways for studying heat transport at the atomic and molecular levels.
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