The perfect thermal conductor and the perfect thermal insulator

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Conclusions and research directions• Hard for me to see a promising path toward“ultrahigh” thermal conductivity (conductivityhigher than diamond at room temperature)• But we could think outside-the-box about…– design of molecular structure to provideultrahigh conductivity polymers– searching for superfluid-type heat conduction insolid-state Bose condensates• Ultralow conductivity (conductivity lower thanaccepted minimum) has been demonstrated.– extend and ehance this physics for thermalbarriers and thermoelectrics– need to understand the physics of roughnanowires; localization in 1D?
Research directions• Passive and active control of heat conduction– Thermal regulator, thermal switch, thermalrectifier– Phase transformations are (to me) mostpromising route– Applications for passive temperature control;electrocaloric cooling; thermal protection
Page 1 and 2: Thermal unobtainiums?The perfect th
Page 3 and 4: Outline—toward perfect thermal in
Page 5 and 6: Peak occurs at T ∼ Θ Debye /30 i
Page 7 and 8: Isotopes contribute to thermal resi
Page 9 and 10: High Debye temperature also produce
Page 11 and 12: Ambipolar diffusion contributes to
Page 13 and 14: But unconventional metals show avar
Page 15 and 16: Could a solid-state Bose condensate
Page 17 and 18: Nanoscale boundary scattering reduc
Page 19 and 20: Disorder creates localization in 1D
Page 21 and 22: Works well for homogeneousdisordere
Page 23 and 24: Layered disordered crystals: WSe 2
Page 25 and 26: Thermal conductivity of WSe 2• 60
Page 27: Back to experiment: Can we lower th

The perfect thermal conductor and the perfect thermal insulator

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