Temperature-Dependent Transformation Thermotics: From Switchable Thermal Cloaks to Macroscopic Thermal Diodes

Li, Ying; Shen, Xiangying; Wu, Zuxuan; Ji, Huang; Chen, Yixuan; Ni, Yushan; Huang, Jiping

doi:10.1103/physrevlett.115.195503

Cited by 245 publications

(166 citation statements)

References 42 publications

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“…Size Effect Anisotropy (nCB [9]) Solid/Solid Transition (s/s) Solid/Liquid Transition (s/l) Superconductor (NbC 0.97 [22]) Active Thermal Conductivity Switch (TCS) Rectification (C 9 H 16 Pt coated CNT and BNNT [24], Asymmetric nano VO2 beam [25], Thermal diode [26]) Electric/ Magnetic/Stress (Bees-wax [6], SrTiO 3 [7], 5CB [8], Cu wire [10], InSb [11], Ferroric-twinned thin film [12]) MEMS (Thermal switch radiator [16], Solid-Liquid thermal interface [17,18]) Thermomechanical (Gas gap heat switch [19]) Thermal (Automatic heat switch [20], Thermal actuator [21]) Wetting (B nanoribbon [13,14], Film/transition boiling transition [15] [44], Te [32,45], InSb / GaSb [46], CdSb [47,48], AlSb [49][50][51], Zn 3 Sb 2 [52]) Semiconductor /Semiconductor (S/S) (LiNO 3 [35], InSe [41]) Metal /Metal (M/M) (Hg [32], K / Zn / Sb / Al / Cu [32,53], Sn [33,53], Ga [32,53,54], In [53,55,56], Cd …”

Section: Bulkmentioning

confidence: 99%

“…The thermal rectification has been widely studied [24][25][26] and these solid-state devices show the thermal conductivity transition with respect to the heat-flow direction. CNTs and BNNTs were engineered to have a non-uniform axial mass by coating with amorphous C 9 H 16 Pt, so that they have asymmetric axial thermal conductance at room temperature 24 .…”

Section: Bulkmentioning

confidence: 99%

“…This temperature-gated thermal rectification for the active heat flow control has been the highest rectification. A macroscopic thermal diode based on switchable thermal clocking can also control the thermal flow 26 . This device, which consist of alternating layers made of copper and expanded polystyrene, blocks the heat in one direction whereas it conducts well in the opposite direction, thus it acts as electronic diode.…”

Section: Bulkmentioning

confidence: 99%

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Thermal conductivity switch: Optimal semiconductor/metal melting transition

Kim

Kaviany

2016

Phys. Rev. B

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Scrutinizing distinct solid/liquid (s/l) and solid/solid (s/s) phase transitions (passive transitions) for large change in bulk (and homogenous) thermal conductivity, we find the s/l semiconductor/metal (S/M) transition produces largest dimensionless thermal conductivity switch (TCS) figure of merit Z TCS (change in thermal conductivity divided by smaller conductivity). At melting temperature, the solid phonon and liquid molecular thermal conductivities are comparable and generally small, so the TCS requires localized electron solid and delocalized electron liquid states.For cyclic phase reversibility, the congruent phase transition (no change in composition) is as important as the thermal transport. We identify XSb and XAs (X = Al, Cd, Ga, In, Zn) and describe atomic-structural metrics for large Z TCS , then show the superiority of S/M phonon-to electrondominated transport melting transition. We use existing experimental results and theoretical and ab initio calculations of the related properties for both phases (including the Kubo-Greenwood and Bridgman formulations of liquid conductivities). The 5p orbital of Sb contributes to the semiconductor behavior in the solid-phase bandgap and upon disorder and bond-length changes in the liquid phase this changes to metallic, creating the large contrast in thermal conductivity.The charge density distribution, electronic localization function, and electron density of states are used to mark this S/M transition. For optimal TCS, we examine the elemental selection from the transition-, basic-and semimetals and semiconductor groups. For CdSb, addition of residual Ag suppresses the bipolar conductivity and its Z TCS is over 7, and for Zn 3 Sb 2 it is expected to be over 14, based on the structure and transport properties of the better known β-Zn 4 Sb 3 . This is the highest Z TCS identified. In addition to the metallic melting, the high Z TCS is due to the electron-poor nature of II-V semiconductors leading to the significantly low phonon conductivity.

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Section: Bulkmentioning

confidence: 99%

Section: Bulkmentioning

confidence: 99%

Section: Bulkmentioning

confidence: 99%

See 1 more Smart Citation

Thermal conductivity switch: Optimal semiconductor/metal melting transition

Kim

Kaviany

2016

Phys. Rev. B

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“…The form invariance of the heat diffusion equation after coordinate transformation led to the extension of TO to the thermal field to guide the design and experiments of thermal TO devices including thermal cloaks, [7][8][9][10][11][12][13] concentrators, [14][15][16][17][18][19][20][21][22][23][24][25] rotators, 26 camouflage, 27 and diodes. 28 With thermal TO devices, an active and efficient control of thermal energy can be achieved with a pre-designed profile and reasonable arrangement of metamaterials.…”

Section: Introductionmentioning

confidence: 99%

Geometrical effects on the concentrated behavior of heat flux in metamaterials thermal harvesting devices

Zhang

Xie

et al. 2017

AIP Advances

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Thermal harvesting devices based on transformation optics, which can manipulate the heat flux concentration significantly through rational arrangements of the conductivities, have attracted considerable interest owing to several great potential applications of the technique for high-efficiency thermal conversion and collection. However, quantitative studies on the geometrical effects, particularly wedge angles, on the harvesting behaviors are rare. In this paper, we adopt wedge structure-based thermal harvesting schemes, and focus on the effects of the geometrical parameters including the radii ratios and wedge angles on the harvesting performance. The temperature deformations at the boundaries of the compressional region and temperature gradients for the different schemes with varying design parameters are investigated. Moreover, a concept for temperature stabilization was derived to evaluate the fluctuation in the energy distributions. In addition, the effects of interface thermal resistances have been investigated. Considering the changes in the radii ratios and wedge angles, we proposed a modification of the harvesting efficiency to quantitatively assess the concentration performance, which was verified through random tests and previously fabricated devices. In general, this study indicates that a smaller radii ratio contributes to a better harvesting behavior, but causes larger perturbations in the thermal profiles owing to a larger heat loss. We also find that a smaller wedge angle is beneficial to ensuring a higher concentration efficiency with less energy perturbations. These findings can be used to guide the improvement of a thermal concentrator with a high efficiency in reference to its potential applications as novel heat storage, thermal sensors, solar cells, and thermoelectric devices.

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“…1, [8][9][10] With thermal metamaterials, many new heat transfer phenomena have been reported, like cloaking, concentrating, rotating, inversing, thermal diode, camouflage, illusion, lens, etc. [11][12][13][14][15][16][17][18][19] An intuitive question thus arises that whether we could realize the directional heat transport through thermal metamaterials.…”

Section: Introductionmentioning

confidence: 99%

Directional heat transport through thermal reflection meta-device

Zhou

Shu

et al. 2016

AIP Advances

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Directional heat transfer may be hard to realize due to the fact that heat transfer is diffusive. In this paper, we try to take one step forward based on the transformation thermodynamics. A special structure and meta-device is proposed to “reflect” the heat flow directionally–just like the mirror to the light beam, in which the heat flow just one-time changes the direction rather than gradually changing the directions in isotropic materials. The benefits of such thermal reflection meta-device are discussed by comparing the corresponding thermal resistance with the same structures of isotropic materials. The proposed meta-device is verified to possess the low thermal resistance and high heat transfer ability with least energy loss, and can be made by nature-existing isotropic materials with specific structures.

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Temperature-Dependent Transformation Thermotics: From Switchable Thermal Cloaks to Macroscopic Thermal Diodes

Cited by 245 publications

References 42 publications

Thermal conductivity switch: Optimal semiconductor/metal melting transition

Thermal conductivity switch: Optimal semiconductor/metal melting transition

Geometrical effects on the concentrated behavior of heat flux in metamaterials thermal harvesting devices

Directional heat transport through thermal reflection meta-device

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