Observation of reduced thermal conductivity in a metal-organic framework due to the presence of adsorbates

Author:

Babaei Hasan,DeCoster Mallory E.ORCID,Jeong Minyoung,Hassan Zeinab M.,Islamoglu Timur,Baumgart HelmutORCID,McGaughey Alan J. H.ORCID,Redel Engelbert,Farha Omar K.,Hopkins Patrick E.ORCID,Malen Jonathan A.,Wilmer Christopher E.

Abstract

AbstractWhether 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.

Funder

National Science Foundation

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry

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