scholarly journals Role of light and heavy embedded nanoparticles on the thermal conductivity of SiGe alloys

2011 ◽  
Vol 84 (12) ◽  
Author(s):  
A. Kundu ◽  
N. Mingo ◽  
D. A. Broido ◽  
D. A. Stewart
Keyword(s):  
Thermal Conductivity ◽  
Embedded Nanoparticles ◽  
Role Of Light

Thermal Conductivity Characterization and Modeling of P-Type Metal/Semiconductor Nanocomposites

2010 ◽  
Author(s):  
Dongyan Xu ◽  
Joseph P. Feser ◽  
Yang Zhao ◽  
Hong Lu ◽  
Peter Burke ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Boltzmann Transport ◽  
Omega Method ◽  
Thermoelectric Energy ◽  
Semiconductor Matrix ◽  
Semiconductor Nanocomposites ◽  
Embedded Nanoparticles ◽  
P Type

Semiconductor alloys with epitaxially embedded nanoparticles have been shown to be very promising materials for thermoelectric energy conversion applications. In this work, we report on thermal conductivity characterization of two classes of p-type nanoparticle-in-alloy composite materials: compensated InGaAs semiconductor matrix with randomly distributed ErAs nanoparticles, and GaSb and its alloys with embedded ErSb nanoparticles. The three omega method is used to measure thermal conductivity of all materials. It is shown that thermal conductivity of compensated p-type ErAs:InGaAs is comparable to the n-type ErAs:InGaAs and it reduces with the increase in the erbium concentration. ErSb:GaSb nanocomposites are intrinsically p-type and show a thermal conductivity substantially lower than the pure GaSb compound. By comparing nanostructured samples from alloyed (InGaSb) and unalloyed (GaSb) matrix materials, we show that alloying is complimentary to the role of the nanostructure in reducing thermal conductivity. We also discuss Boltzmann transport modeling that indicates an optimum nanocrystal size, and the prospects for further reductions in the lattice thermal conductivity.

scholarly journals Thermal Conductivity Calculations for Nanoparticles Embedded in a Base Fluid

2021 ◽  
Vol 11 (4) ◽  
pp. 1459
Author(s):  
Soran M. Mamand
Keyword(s):  
Thermal Conductivity ◽  
Base Fluid ◽  
Theoretical Models ◽  
Simple Method ◽  
Size Dependent ◽  
Nanolayer Thickness ◽  
Embedded Nanoparticles ◽  
Comparison With Experimental Data ◽  
Good Agreement

The Prasher analytical model was used for calculating the thermal conductivity of the embedded nanoparticles of Al2O3, CuO, ZnO, and SiO2 in conventional fluids, such as water and ethylene glycol. The values that were obtained were used in the nanofluid theoretical models for comparison with experimental data, where good agreement was obtained. Liang and Li’s theoretical model was also used to calculate the thermal conductivity of these nanoparticles, where the results agreed with those obtained using the Prasher model. The effect of the liquid nanolayer thickness around the nanoparticles that was used to enhance the effective thermal conductivity of nanofluids was explained. The role of the nanoparticles’ surface specularity parameter, which was size-dependent, was clarified. This theoretical trend provides a simple method for estimating the thermal conductivity of nanoparticles and nanofluids.

Lattice Thermal Conductivity Modelling of a Diatomic Nanoscale Material

2020 ◽  
Vol 10 (5) ◽  
pp. 602-609
Author(s):  
Adil H. Awad
Keyword(s):  
Thermal Conductivity ◽  
Lattice Thermal Conductivity ◽  
Phonon Scattering ◽  
Correction Term ◽  
Nanoscale Material ◽  
New Approach ◽  
Two Samples ◽  
Conductivity Modelling ◽  
Callaway Model

Introduction: A new approach for expressing the lattice thermal conductivity of diatomic nanoscale materials is developed. Methods: The lattice thermal conductivity of two samples of GaAs nanobeam at 4-100K is calculated on the basis of monatomic dispersion relation. Phonons are scattered by nanobeam boundaries, point defects and other phonons via normal and Umklapp processes. Methods: A comparative study of the results of the present analysis and those obtained using Callaway formula is performed. We clearly demonstrate the importance of the utilised scattering mechanisms in lattice thermal conductivity by addressing the separate role of the phonon scattering relaxation rate. The formulas derived from the correction term are also presented, and their difference from Callaway model is evident. Furthermore their percentage contribution is sufficiently small to be neglected in calculating lattice thermal conductivity. Conclusion: Our model is successfully used to correlate the predicted lattice thermal conductivity with that of the experimental observation.

scholarly journals Assessing the Role of Light Absorption in Laser Lithotripsy by Isotopic Substitution of Kidney Stone Materials

2020 ◽  
Vol 6 (9) ◽  
pp. 5274-5280
Author(s):  
Sorout Shalini ◽  
Derek S. Frank ◽  
Ali H. Aldoukhi ◽  
Sami E. Majdalany ◽  
William W. Roberts ◽  
...  
Keyword(s):  
Light Absorption ◽  
Kidney Stone ◽  
Laser Lithotripsy ◽  
Isotopic Substitution ◽  
Stone Materials ◽  
Role Of Light

Role of electron–phonon coupling in thermal conductivity of metallic nanofluids

2019 ◽  
Vol 52 (48) ◽  
pp. 485302 ◽  
Author(s):  
Dong-Xing Song ◽  
Yu-Feng Zhang ◽  
Wei-Gang Ma ◽  
Xing Zhang
Keyword(s):  
Thermal Conductivity ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

Role of Light and Medium Composition on Growth and Valepotriate Contents in Valeriana glechomifolia Whole Plant Liquid Cultures

2006 ◽  
Vol 86 (2) ◽  
pp. 211-218 ◽  
Author(s):  
Denise Russowski ◽  
Natasha Maurmann ◽  
Sandra Beatriz Rech ◽  
Arthur Germano Fett-Neto
Keyword(s):  
Medium Composition ◽  
Liquid Cultures ◽  
Whole Plant ◽  
Role Of Light

Role of light-induced scattering in the optical limitation of laser radiation on the basis of fullerene-containing media

2001 ◽  
Vol 90 (2) ◽  
pp. 292-301 ◽  
Author(s):  
I. M. Belousova ◽  
V. A. Grigor’ev ◽  
O. B. Danilov ◽  
A. G. Kalintsev ◽  
A. V. Kris’ko ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Optical Limitation ◽  
Role Of Light
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