Quantized thermal conductance via phononic heat transport in nanoscale devices at low temperatures

2014 ◽  
Vol 89 (13) ◽  
Author(s):  
M. Käso ◽  
U. Wulf
Keyword(s):  
Heat Transport ◽  
Low Temperatures ◽  
Thermal Conductance ◽  
Nanoscale Devices

scholarly journals Using Amorphous CoB Alloy as Transducer to Detect Acoustic Propagation and Heat Transport at Interface

2021 ◽  
Vol 11 (11) ◽  
pp. 5155
Author(s):  
Liu Jian ◽  
Gyung-Min Choi
Keyword(s):  
Heat Transport ◽  
Sapphire Substrate ◽  
Intermediate Layer ◽  
Thermal Conductance ◽  
Acoustic Oscillation ◽  
Acoustic Propagation ◽  
Acoustic Oscillations ◽  
Interfacial Coupling ◽  
Soft Layer ◽  
Substrate Interface

Acoustic oscillation provides useful information regarding the interfacial coupling between metal transducer layers and substrate materials. The interfacial coupling can be significantly reduced by a mechanically soft layer between the transducer and substrate. However, preserving a thin, soft layer at the interface during fabrication is often challenging. In this study, we demonstrate that an amorphous CoB alloy on top of a sapphire substrate can substantially amplify acoustic oscillations. By analyzing the attenuation of acoustic oscillations, we show that a thin, soft layer with a thickness of >2 ± 1 Å exists at the interface. The intermediate layer at the interface is further verified by investigating heat transport. By analyzing the slow decrease of the temperature of the transducer layer, we determine a thermal conductance of 35 ± 5 MW m−2 K−1 at the transducer/substrate interface. This low value supports the existence of a thin, soft layer at the interface. Our results demonstrate that an amorphous metal with B alloying effectively preserves the soft nature at the interface and detects the acoustic propagation and heat transport across it.

scholarly journals Laboratory Metabolism of Incubating Semipalmated Plovers

The Condor ◽  
2006 ◽  
Vol 108 (4) ◽  
pp. 966-970
Author(s):  
Mark Williamson ◽  
Joseph B. Williams ◽  
Erica Nol
Keyword(s):  
Critical Temperature ◽  
Metabolic Rate ◽  
Breeding Season ◽  
Basal Metabolic Rate ◽  
Low Temperatures ◽  
Thermal Conductance ◽  
Basal Metabolism ◽  
The Arctic ◽  
Lower Critical Temperature ◽  
Metabolic Data

Abstract Abstract The Semipalmated Plover (Charadriussemipalmatus), anarctic-nesting migratory shorebird, regularlyencounters low temperatures during the breedingseason. We measured the basal metabolism of adultsduring incubation at Churchill, Manitoba, Canada todetermine basal metabolic rate (BMR),lower critical temperature(Tlc), total evaporative waterloss (TEWL), and dry thermal conductance(Cm). BMR and Tlcwere 47.4 kJ day−1and 23.3°C, respectively, TEWL was2.5 mL H2O−d,and Cm was1.13 mW g−1 °C−1.Measured BMR and Tlc were consistentwith high values found for other shorebird speciesbreeding in the Arctic, while Cm was18% higher than predicted from allometricequations. These metabolic data suggest thatSemipalmated Plovers are adapted to balance therequirements of incubation against energetic andthermoregulatory demands in the Arctic, especiallyin harsh early breeding season conditions.

Electron-phonon heat transport in degenerate Si at low temperatures

2004 ◽  
Vol 1 (11) ◽  
pp. 2848-2851 ◽  
Author(s):  
P. Kivinen ◽  
M. Prunnila ◽  
A. Savin ◽  
P. Törmä ◽  
J. Pekola ◽  
...  
Keyword(s):  
Heat Transport ◽  
Low Temperatures

Heat Transport in Impure Insulators at Low Temperatures

1971 ◽  
Vol 43 (1) ◽  
pp. 333-342 ◽  
Author(s):  
Y. P. Joshi ◽  
G. S. Verma
Keyword(s):  
Heat Transport ◽  
Low Temperatures

Heat Transport in a Stainless Steel at Very Low Temperatures

Nature ◽  
1964 ◽  
Vol 201 (4916) ◽  
pp. 283-284 ◽  
Author(s):  
DOUGLAS PROBERT
Keyword(s):  
Stainless Steel ◽  
Heat Transport ◽  
Low Temperatures

Effect of Interfacial Thermal Conductance Between the Nanoparticles

2018 ◽  
Author(s):  
Anil Yuksel ◽  
Edward T. Yu ◽  
Michael Cullinan ◽  
Jayathi Murthy
Keyword(s):  
Heat Transfer ◽  
Heat Transport ◽  
Thermal Management ◽  
Contact Point ◽  
Radiation Heat Transfer ◽  
Thermal Conductance ◽  
Radiation Heat ◽  
Interfacial Thermal Conductance ◽  
Nanostructured Interfaces

Heat transport across nanostructured interfaces, such as between nanoparticles, has been of great interest for advanced thermal management. Interfacial thermal conductance, G, is central to understanding thermal heat transport between nanoparticles that have a contact point between each other as well as the surrounded medium. In this study, we show that G dominates the heat transport compared to the conduction and radiation heat transfer modes between the nanoparticles for values higher than ∼20 (MW/m2K). We also investigate the effect of radius of contact between the nanoparticles on the overall modes of heat transfer.

Thermal conductance attributed to phonon and electron in graphene nanoribbon

2014 ◽  
Vol 28 (18) ◽  
pp. 1450116 ◽  
Author(s):  
En-Jia Ye ◽  
Yi-Jian Shi ◽  
Lihong Shi ◽  
Xuean Zhao
Keyword(s):  
Low Temperature ◽  
Heat Transport ◽  
Energy Band ◽  
Function Method ◽  
Energy Transport ◽  
Graphene Nanoribbons ◽  
Thermal Conductance ◽  
Square Lattice ◽  
Heat Current ◽  
Electron Contribution

In this work, the energy transport of phonon and electron in graphene nanoribbons (GNRs) are investigated by the nonequilibrium Green's function method without considering the interaction of phonon and electron. The heat current of phonon contribution comes from the gradient of temperature. While for the electron contribution, it stems from the gradient of both temperature and electrochemical potential. The corresponding intermediate functions satisfy the Onsager relationship. Thermal conductances are calculated in GNR and compared to those in square lattice ribbon model respectively. It is found that both the phonon and electron thermal conductances in square lattice ribbon are smaller than those in GNRs at low temperature and surpass those in armchair and zigzag GNRs respectively, as the temperature increases. Meanwhile, the heat transport is related to the edges of GNRs. These phenomena depend on their dispersion relations and energy band structures.

Silicon Nanowire Conductance in the Ballistic Regime: Models and Simulations

2012 ◽  
Vol 134 (5) ◽  
Author(s):  
David Lacroix ◽  
Karl Joulain ◽  
Jerome Muller ◽  
Gilles Parent
Keyword(s):  
Elastic Wave ◽  
Heat Transport ◽  
Silicon Nanowires ◽  
Silicon Nanowire ◽  
Normal Modes ◽  
Thermal Conductance ◽  
Wave Theory ◽  
Ballistic Regime ◽  
Thin Wires ◽  
Transmission And Reflection

This study deals with phonon heat transport in silicon nanowires. A review of various methods that can be used to assess thermal conductance of such nanodevices is presented. Here, a specific attention is paid to the case of the Landauer Formalism, which can describe extremely thin wires conductance. In order to use this technique, the calculation of propagating modes in a silicon nanowire is necessary. Among the several existing models allowing such calculation, the elastic wave theory has been used to obtain the normal mode number. Besides, in this study, the transmission and reflection of phonon at the interface between two nanostructures are discussed. Using the diffuse mismatch model (DMM), the global transmissivity of the system made of a nanowire suspended between two thermal reservoirs is addressed. Then, the calculations of normal modes’ numbers and thermal conductances of several silicon nanowires, with various diameters set between bulk thermal reservoirs, are presented and compared to other models and available experiments.

Thermal conductance measurements of a silicon nitride membrane at low temperatures

2000 ◽  
Vol 284-288 ◽  
pp. 1968-1969 ◽  
Author(s):  
Adam L Woodcraft ◽  
Rashmi V Sudiwala ◽  
Elley Wakui ◽  
Ravinder S Bhatia ◽  
James J Bock ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Low Temperatures ◽  
Thermal Conductance ◽  
Silicon Nitride Membrane
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