A Review on Phonon Transport within Polycrystalline Materials

Abstract

As one fundamental problem in materials science research, thermal transport across grain boundaries is critical to many energy-related applications. Due to the complexity of grain boundaries, the current understanding on how a grain boundary interacts with heat carriers is still in its infancy. This review summarizes the current progresses of this important topic, with its further extension to general interfaces. One focus is on major modeling and simulation techniques to predict the thermal resistance of a grain boundary. The corresponding thermal measurements of individual grain boundaries and grain-boundary thermal engineering are also discussed. A better understanding of the grain-boundary phonon transport is critical to many energy-related applications, where the concerned thermal transport within a polycrystalline material can be largely suppressed by grain boundaries.

Enhancement of intrinsic thermal conductivity of liquid crystalline epoxy through the strategy of interlocked polymer networks

“…Naturally, the thermal conductivity of Control-A-3 is poorer than ILLCE 0.500/0.6 -3 at the same mass ratios of the single networks (Table 3), as a result of the shortage of the ordered regions that improve the chain regularity and inhibit phonon scattering. 66–68…”

“…Naturally, the thermal conductivity of Control-A-3 is poorer than ILLCE 0.500/0.6 -3 at the same mass ratios of the single networks (Table 3), as a result of the shortage of the ordered regions that improve the chain regularity and inhibit phonon scattering. [66][67][68] Effect of interlocked structure So far, the advantage of ILNs for improving the thermal conductivity of single networks has been confirmed. The thermal micrographs (Fig.…”

Highly Sensitive and Selective Sulfite Ion Sensor Based on Biochemically Stable Iodo‐Functionalized Coumarin Fluorophores

“…Here, we endeavour to investigate the effectiveness of photoactive, stable and luminescent coumarin related molecules against ecological pollutants. Hereby, we investigate the game‐changing effect of a rather modest chemical appendment of a previously reported yet analytically insignificant coumarin‐functionalized molecule ( E ) into a selective reporter ( D ) of sulfite ions in suspension [19,20] . The selective ligand ( D ) possesses wide variety of significance as compared to the already published reports due to exciting absorption and fluorescence emission behavior which suggest their extreme application in field of pollutant sensing including metal ions, anions and so on.…”

“…Hereby, we investigate the game-changing effect of a rather modest chemical appendment of a previously reported yet analytically insignificant coumarin-functionalized molecule (E) into a selective reporter (D) of sulfite ions in suspension. [19,20] The selective ligand (D) possesses wide variety of significance as compared to the already published reports due to exciting absorption and fluorescence emission behavior which suggest their extreme application in field of pollutant sensing including metal ions, anions and so on. Additionally, the easy and noncomplicated synthetic methodology and utilization of ligand (D) in presence of acetonitrile instead of heavy organic solvents makes it more prominent and rising material.…”

Engineering thermal transport within Si thin films: The impact of nanoslot alignment and ion implantation

“…This material restriction can now be opened up by decoupling the electron and phonon transport using multi-length scale structures ( Biswas et al., 2012 ; Bux et al., 2009 ; Lan et al., 2009 ; Poudel et al., 2008 ). The structures introduced into the materials include point defects such as alloy atoms ( Wood, 1988 ), embedded nanostructures, and nano- to micro-grain boundaries ( Hao and Garg, 2021 ; Vineis et al., 2010 ; Wan et al., 2010 ). These structures can minimize the k L across the whole phonon spectrum, while maintaining bulk-like electrical properties.…”