Pushing the boundaries of the thermal conductivity of materials

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Contrast with typical behavior of a superlattice (with Y. Cao and D. Jena) Λ (W m -1 K -1 ) 200 100 50 20 10 5 2 (AlN) 4 nm -(GaN) h η = 1.2 nm Λ Bulk GaN 1 τ − = G TiN/MgO h/ v 2 10 100 1000 h GaN (nm)
Conclusions • Difficult to take advantage of superlative properties of carbon nanotubes because of "thermally weak" interfaces. • Can beat the amorphous limit to the thermal conductivity with high densities of interfaces. • Incredibly low thermal conductivity (far below the amorphous limit) in the disordered, layered crystal WSe 2. – Combination of disorder (random stacking of sheets) and anisotropy (large differences in vibrations within and across the sheets) appears to be the key – Can we reproduce this physics in materials with good electrical conductivity for thermoelectric energy conversion? – Can we reproduce this physics in refractory oxides for thermal barriers?
Page 1 and 2: Pushing the boundaries of the therm
Page 3 and 4: Interfaces are critical at the nano
Page 5 and 6: Thermal conductivity and interface
Page 7 and 8: Brief introduction to thermoelectri
Page 9 and 10: Carbon nanotubes • Evidence for t
Page 11 and 12: Critical aspect ratio of a fiber co
Page 13 and 14: psec acoustics and time-domain ther
Page 15 and 16: Windows software author: Catalin Ch
Page 17 and 18: Thermal conductivity map of a human
Page 19 and 20: Critical aspect ratio of a fiber co
Page 21 and 22: Can we beat the amorphous limit of
Page 23 and 24: Works well for homogeneous disorder
Page 25 and 26: W/Al 2 O 3 nanolaminates • ultra-
Page 27 and 28: Cross-sectional TEM of 60 nm thick
Page 29 and 30: Ion irradiation of WSe 2 MD simulat
Page 31 and 32: Molecular dynamics simulation • M
Page 33: Back to experiment: Can we lower th

Pushing the boundaries of the thermal conductivity of materials

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