Al
                  –
                  Si
           multilayers: A synthetic material with large thermoelectric anisotropy

Kyarad, A.; Lengfellner, Hans

doi:10.1063/1.1830680

Cited by 41 publications

(29 citation statements)

References 13 publications

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“…84 A large thermoelectric anisotropy (related to the difference of the parallel and the perpendicular values of the S) of ∼ 1.5 mV/K, was also noted 85 through the use of an Al/Si layered system. It is remarkable that such a large effect was reported in this composite, at room temperature, given that the S values are of the order of 1-10 µV/K for metals, and around 100 µV/K for semiconductors, and may indicate problems with measurement and/or interpretation.…”

Section: B Experimental Investigationsmentioning

confidence: 99%

Layered thermal metamaterials for the directing and harvesting of conductive heat

et al. 2015

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The utility of a metamaterial, assembled from two layers of nominally isotropic materials, for thermal energy re-orientation and harvesting is examined. A study of the underlying phenomena related to heat flux manipulation, exploiting the anisotropy of the thermal conductivity tensor, is a focus. The notion of the assembled metamaterial as an effective thermal medium forms the basis for many of these investigations and will be probed. An overarching aim is to implement in such thermal metamaterials, functionalities well known from light optics, such as reflection and refraction, which in turn may yield insights on efficient thermal lensing. Consequently, the harness and dissipation of heat, which are for example, of much importance in energy conservation and improving electrical device performance, may be accomplished. The possibilities of energy harvesting, through exploiting anisotropic thermopower in the metamaterials is also examined. The review concludes with a brief survey of the outstanding issues and insights needed for further progress.

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Section: B Experimental Investigationsmentioning

confidence: 99%

Layered thermal metamaterials for the directing and harvesting of conductive heat

et al. 2015

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“…This framework first utilized the Kirchhoff Circuit Laws (KCL) to calculate the equivalent properties in the directions parallel and perpendicular to the layer plane, and then employed a tensor transformation to obtain the properties in an arbitrary direction. The validity of this simplified mathematical model has been demonstrated by multiple studies using either finite element simulations [16,17] or experimental simplified mathematical model has been demonstrated by multiple studies using either finite element simulations [16,17] or experimental measurements [12,[18][19][20][21][22][23][24][25][26][27]. In addition to the lamella configuration, composite materials with aligned one-dimensional (1-D) inclusions, as suggested by Goldsmid [1,4], are also good candidates for transverse TE.…”

Section: Introductionmentioning

confidence: 96%

Transverse Thermoelectricity in Fibrous Composite Materials

Qian

Ren

2017

Energies

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Transverse thermoelectric elements have the potential to decouple the electric current and the heat flow, which could lead to new designs of thermoelectric devices. While many theoretical and experimental studies of transverse thermoelectricity have focused on layered structures, this work examines composite materials with aligned fibrous inclusions. A simplified mathematical model was derived based on the Kirchhoff Circuit Laws (KCL), which were used to calculate the equivalent transport properties of the composite structures. These equivalent properties, including Seebeck coefficient, electrical conductivity, and thermal conductivity, compared well with finite element analysis (FEA) results. Peltier cooling performance was also examined using FEA, which exhibited good agreement to KCL model predictions. In addition, a survey was conducted on selected combinations of thermoelectric materials and metals to rank their transverse thermoelectricity with respect to the dimensionless figure of merit.

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“…Nanotechnology is a major example345678. Another example is the transverse TE effect, or the off-diagonal TE effect, which essentially develops in tilted layered materials9101112131415161718. The previous studies have revealed various unusual phenomena arising from this effect including the gigantic voltage generation in incline-oriented nanometer-scale thin films91011, and enhanced power factors in artificial tilted multilayer materials17.…”

mentioning

confidence: 99%

“…Transverse TE devices exhibit distinct functions as compared to the ordinary TE devices as follows; (i) the voltage signal develops perpendicular to the applied ΔT (see the schematic in Fig. 1a)9101112131415161718, (ii) compatibility between n-type and p-type TE material19 is not necessary since either of them is sufficient to construct the device (the polarity of the TE voltage can be reversed by reversing the tilt-direction of the layers), and (iii) the macroscopic physical properties of the multilayer material can be tuned widely by changing the combination and the periodicity of the constituents12131415161718. These features provide us new degree of freedom in designing alternative TE devices.…”

mentioning

confidence: 99%

Bifunctional thermoelectric tube made of tilted multilayer material as an alternative to standard heat exchangers

Takahashi

Kanno

Sakai

et al. 2013

Sci Rep

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Enormously large amount of heat produced by human activities is now mostly wasted into the environment without use. To realize a sustainable society, it is important to develop practical solutions for waste heat recovery. Here, we demonstrate that a tubular thermoelectric device made of tilted multilayer of Bi0.5Sb1.5Te3/Ni provides a promising solution. The Bi0.5Sb1.5Te3/Ni tube allows tightly sealed fluid flow inside itself, and operates in analogy with the standard shell and tube heat exchanger. We show that it achieves perfect balance between efficient heat exchange and high-power generation with a heat transfer coefficient of 4.0 kW/m2K and a volume power density of 10 kW/m3 using low-grade heat sources below 100°C. The Bi0.5Sb1.5Te3/Ni tube thus serves as a power generator and a heat exchanger within a single unit, which is advantageous for developing new cogeneration systems in factories, vessels, and automobiles where cooling of excess heat is routinely carried out.

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Al – Si multilayers: A synthetic material with large thermoelectric anisotropy

Cited by 41 publications

References 13 publications

Layered thermal metamaterials for the directing and harvesting of conductive heat

Layered thermal metamaterials for the directing and harvesting of conductive heat

Transverse Thermoelectricity in Fibrous Composite Materials

Bifunctional thermoelectric tube made of tilted multilayer material as an alternative to standard heat exchangers

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