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Reversible Thermal Conductivity Switching Using Flexible Metal-Organic Frameworks.

Hasan Babaei1, Katie R Meihaus1, Jeffrey R Long1,2,3

  • 1Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.

Chemistry of Materials : a Publication of the American Chemical Society
|August 28, 2023
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Summary

Flexible metal-organic frameworks offer tunable thermal conductivity. These materials show a significant decrease in thermal transport properties when transitioning between expanded and collapsed phases, enabling new thermal device applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Controlling thermal transport is crucial for advanced electronic devices like thermal rectifiers and transistors.
  • Designing materials with significant, switchable changes in thermal conductivity for practical applications remains a challenge.
  • Flexible metal-organic frameworks (MOFs) offer potential for tunable properties due to their structural adaptability.

Purpose of the Study:

  • To investigate the potential of flexible metal-organic frameworks for achieving tunable, switchable thermal conductivity.
  • To explore the anisotropic thermal transport properties of MOFs in response to structural phase transitions.

Main Methods:

  • Utilized molecular dynamics simulations to model thermal transport in flexible metal-organic frameworks.
  • Analyzed the structural transition of the Fe(bdp) framework from an expanded to a collapsed phase.
  • Quantified the change in thermal conductivity along different directions during this phase transition.

Main Results:

  • The flexible metal-organic framework Fe(bdp) exhibits highly anisotropic thermal conductivity.
  • A transition from the expanded to the collapsed phase leads to a nearly order-of-magnitude decrease in thermal conductivity along the compression direction.
  • This significant change demonstrates switchable thermal transport capabilities in the studied MOF.

Conclusions:

  • Flexible metal-organic frameworks can be engineered for tunable and switchable thermal conductivity.
  • The observed anisotropic thermal transport in Fe(bdp) highlights its potential for thermal management applications.
  • These findings contribute to the growing field of MOFs for advanced thermal transport applications.