Toward phonon-boundary engineering in nanoporous materials
Author(s)Romano, Giuseppe; Grossman, Jeffrey C.
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Tuning thermal transport in nanostructured materials is a powerful approach to develop high-efficiency thermoelectric materials. Using a recently developed approach based on the phonon mean free path dependent Boltzmann transport equation, we compute the effective thermal conductivity of nanoporous materials with pores of various shapes and arrangements. We assess the importance of pore-pore distance in suppressing thermal transport, and identify the pore arrangement that minimizes the thermal conductivity, composed of a periodic arrangement of two misaligned rows of triangular pores. Such a configuration yields a reduction in the thermal conductivity of more than 60% with respect the simple circular aligned case with the same porosity.
DepartmentMassachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Mechanical Engineering
Applied Physics Letters
American Institute of Physics (AIP)
Romano, Giuseppe, and Jeffrey C. Grossman. “Toward Phonon-Boundary Engineering in Nanoporous Materials.” Appl. Phys. Lett. 105, no. 3 (July 21, 2014): 033116.