Document Type

Article

Publication Date

2020

DOI

10.1038/s41467-020-17822-0

Publication Title

Nature Communications

Volume

11

Pages

1-8

Abstract

Whether the presence of adsorbates increases or decreases thermal conductivity in metal-organic frameworks (MOFs) has been an open question. Here we report observations of thermal transport in the metal-organic framework HKUST-1 in the presence of various liquid adsorbates: water, methanol, and ethanol. Experimental thermoreflectance measurements were performed on single crystals and thin films, and theoretical predictions were made using molecular dynamics simulations. We find that the thermal conductivity of HKUST-1 decreases by 40 – 80% depending on the adsorbate, a result that cannot be explained by effective medium approximations. Our findings demonstrate that adsorbates introduce additional phonon scattering in HKUST-1, which particularly shortens the lifetimes of low-frequency phonon modes. As a result, the system thermal conductivity is lowered to a greater extent than the increase expected by the creation of additional heat transfer channels. Finally, we show that thermal diffusivity is even more greatly reduced than thermal conductivity by adsorption.

Comments

This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Original Publication Citation

Babaei, H., DeCoster, M. E., Jeong, M., Hassan, Z. M., Islamoglu, T., Baumgart, H., McGaughey, A. J., Redel, E., Farha, O. K., & Hopkins, P. E. (2020). Observation of reduced thermal conductivity in a metal-organic framework due to the presence of adsorbates. Nature Communications, 11, 1-8, Article 4010. https://doi.org/10.1038/s41467-020-17822-0

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