Heat conduction below diffusive limit in amorphous superlattice structures

Liao, Yuxuan; Iwamoto, Sotaro; Sasaki, Michiko; Goto, Masahiro; Shiomi, Junichiro

doi:10.1016/j.nanoen.2021.105903

Cited by 8 publications

(3 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[84][85][86] These predictions were experimentally confirmed in various amorphous and crystalline superlattices. [87][88][89] However, this ultra-low thermal conductivity is mainly attributed to the incoherent phonon scattering.…”

Section: Coherent Heat Conduction In Superlatticesmentioning

confidence: 99%

Review of coherent phonon and heat transport control in one-dimensional phononic crystals at nanoscale

2021

View full text Add to dashboard Cite

show abstract

Section: Coherent Heat Conduction In Superlatticesmentioning

confidence: 99%

Review of coherent phonon and heat transport control in one-dimensional phononic crystals at nanoscale

2021

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

“…With regards to the structures of materials, superlattice structures and array stacking of different materials have been investigated in semiconductors exhibiting high heat conductivity. [3][4][5][6] Some studies reported interesting polymer structures, such as felt, [7] fabric spike shape, [8] and simple leg-type microstructure. [9] GB has recently been in the spotlight for creating the internal structure of nanocomposites The GB structure is a hollow spherical ceramic bead with a microscale size.…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity controlled by a segregated network prepared using carbon nanotube/polyamide 6 composite with glass bubbles

et al. 2023

View full text Add to dashboard Cite

In this study, a carbon nanotube-glass bubble/polyamide 6 (CNT-GB/PA6) multiscale hybrid composite was manufactured. Through a coagulation process including CNT and GB, a segregated network was formed to produce a composite structure with tunable thermal conductivity. Within the segregated network structure, a complex phenomenon of decrease and increase in thermal conductivity owing to the interaction by CNT and GB, and an equation to predict thermal conductivity through the contents of GB and CNT was formulated. A model to predict the thermal conductivity using the RSM analysis was presented, and the contents of GB and CNT were adjusted according to the required thermal conductivity. It was confirmed through the LFA thermal conductivity measurement that the thermal conductivity increased with GB and CNT contents. Moreover, when 30% of GB was added to the 5 wt% CNT composite, the thermal conductivity increased by about 17%. However, in the experiment to confirm the effect of GB alone, it was confirmed that the thermal conductivity decreased as the GB content increased. Thus, the size of the structural path, which was controlled by the GB content through which electrons pass, played an important role in this study. The results of this study can be used in astronautic fields that require insulation to save energy and in construction engineering where thermal insulation and heat emission are important.

show abstract

Anderson Localization of Phonons in Thermally Superinsulating Graphene Aerogels with Metal‐Like Electrical Conductivity

Šilhavík,

Kumar,

Levinský

et al. 2024

Small Methods

View full text Add to dashboard Cite

In the quest to improve energy efficiency and design better thermal insulators, various engineering strategies have been extensively investigated to minimize heat transfer through a material. Yet, the suppression of thermal transport in a material remains elusive because heat can be transferred by multiple energy carriers. Here, the realization of Anderson localization of phonons in a random 3D elastic network of graphene is reported. It is shown that thermal conductivity in a cellular graphene aerogel can be drastically reduced to 0.9 mW m−1 K−1 by the application of compressive strain while keeping a high metal‐like electrical conductivity of 120 S m−1 and ampacity of 0.9 A. The experiments reveal that the strain can cause phonon localization over a broad compression range. The remaining heat flow in the material is dominated by charge transport. Conversely, electrical conductivity exhibits a gradual increase with increasing compressive strain, opposite to the thermal conductivity. These results imply that strain engineering provides the ability to independently tune charge and heat transport, establishing a new paradigm for controlling phonon and charge conduction in solids. This approach will enable the development of a new type of high‐performance insulation solutions and thermally superinsulating materials with metal‐like electrical conductivity.

show abstract

Heat conduction below diffusive limit in amorphous superlattice structures

Cited by 8 publications

References 33 publications

Review of coherent phonon and heat transport control in one-dimensional phononic crystals at nanoscale

Review of coherent phonon and heat transport control in one-dimensional phononic crystals at nanoscale

Thermal conductivity controlled by a segregated network prepared using carbon nanotube/polyamide 6 composite with glass bubbles

Anderson Localization of Phonons in Thermally Superinsulating Graphene Aerogels with Metal‐Like Electrical Conductivity

Contact Info

Product

Resources

About