Pushing the boundaries of the thermal conductivity of materials

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Thermal conductivity and interface thermal conductance • Both properties are difficult to understand and control because they are integral properties. • For example, simplest case of thermal conductivity where resistive scattering dominates Λ = 1/3∫ C(ω) v(ω) l(ω) dω C(ω) = heat capacity of phonon mode v(ω) = group velocity l(ω) = mean-free-path
Brief introduction to thermoelectric materials • Solid-state heat pump; thermal efficiency governed by the “figure of merit” ZT ZT 2 S σT = Λ Lon Bell, Science (2008) S = Seebeck coefficient σ = electrical conductivity Λ = thermal conductivity
Page 1 and 2: Pushing the boundaries of the therm
Page 3 and 4: Interfaces are critical at the nano
Page 5: Thermal conductivity and interface
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 and 34: Back to experiment: Can we lower th
Page 35: Conclusions • Difficult to take a

Pushing the boundaries of the thermal conductivity of materials

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