Pore-size dependence of the heat conduction in porous silicon and phonon spectral energy density analysis

Chen, Jia; Zhang, Xiaobing

doi:10.1016/j.physleta.2020.126503

Cited by 9 publications

(3 citation statements)

References 38 publications

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“…According to Refs. [37,38], the reduction in effective thermal conductivity caused by phonon ballistic effects can be attributed to the effects of pore size and pore volume. Phonon scattering is dramatically improved by nanoscale pores.…”

Section: Discussionmentioning

confidence: 99%

Geopolymer Made from Kaolin, Diatomite, and Rice Husk Ash for Ceiling Thermal Insulation

Alvarado,

Martínez-Cerna,

Alvarado-Quintana

2023

Buildings

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In this study, geopolymers made of metakaolin (MK), diatomite (D), and rice husk ash (RHA) were developed for ceiling thermal insulation in houses to provide protection against cold temperatures. The influence of the constituent mixing ratio and the temperature of curing on the heat conductivity and compressive strength of the geopolymer was investigated. Specimens were formed according to a 10-level mix design with three replicates and subjected to curing at 40 °C and 80 °C. Heat conductivity and compressive strength were determined in accordance with established standards. The simplex lattice method was used to obtain the response surfaces, contour plots, and tracking curves. The geopolymers under study displayed a reduction in heat conductivity and an increase in compressive strength when the curing temperature was raised. The optimal mixing ratio to achieve a balance between the compressive strength and thermal conductivity of the geopolymers investigated was 0.50 MK and 0.50 RHA. Diatomite’s thermal insulation contribution is neutralized when crystals from the geopolymer gel fill the pore volume. The mixture’s optimal results were achieved when cured at 80 °C, demonstrating a thermal conductivity of 0.10 W/m·K and a compressive strength of 5.37 MPa.

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Section: Discussionmentioning

confidence: 99%

Geopolymer Made from Kaolin, Diatomite, and Rice Husk Ash for Ceiling Thermal Insulation

Alvarado,

Martínez-Cerna,

Alvarado-Quintana

2023

Buildings

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“…Because gas phases typically possess lower thermal conductivity than solid phases, increasing porosity would result in lower heat conduction [44,45]. In addition, decreased pore size would also lead to lower heat conduction [46][47][48]. That is because with the reduction in pore size, the number of gas-solid interfaces would be increased, resulting in longer heat conduction distance along the solid phase and greater heat resistance.…”

Section: Heat Insulationmentioning

confidence: 99%

Design, fabrication and properties of lightweight wear lining refractories: A review

Huang

et al. 2022

Journal of the European Ceramic Society

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“…Due to its wide surface areas in the compact volumes, PSi was transformed to the direct bandgap energy material, ensuring the most extensive incident light absorption from the solar spectrum, resulting in a rise in solar cell efficiency. In addition, the unique optical characteristics of PSi make it a versatile candidate for diverse optoelectronic applications [40][41][42]. Meanwhile, the electrical characteristics and performance of PSi-based solar cells were determined by measuring the I-V curve using a solar simulator.…”

Section: Structure and Morphology Of Znpsi And Znsiqdsmentioning

confidence: 99%

Performance Improvement of Graded Bandgap Solar Cell via Optimization of Energy Levels Alignment in Si Quantum Dot, TiO2 Nanoparticles, and Porous Si

Almomani

Ahmed²,

Rashid³

et al. 2022

Photonics

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Charge carriers’ generation from zinc includes silicon quantum dots (ZnSiQDs) layer sandwiched in-between porous silicon (PSi) and titania nanoparticles (TiO2NPs) layer-based solar cell is an efficient way to improve the cell’s performance. In this view, ZnSiQDs layer with various QDs sizes have been inserted, separating the PSi and TiO2NPs layers to achieve some graded bandgap quantum dot solar cells (GBQDSCs). In this process, ZnSiQDs of mean diameter 1.22 nm is first prepared via the top-down method. Next, ZnSiQDs have been re-grown using the bottom-up approach to get various mean diameters of 2.1, 2.7 and 7.4 nm. TiO2NPs of mean diameter in the range of 3.2 to 33.94 nm have been achieved via thermal annealing. The influence of different ZnSiQDs sizes on the designed GBGQDSCs performance has been determined. The proposed cell attains a short circuit current of 40 mA/cm2 and an efficiency of 4.9%. It has been shown that the cell performance enhances by optimizing the energy levels alignment in the PSi, ZnSiQDs, TiO2NPs layers.

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Pore-size dependence of the heat conduction in porous silicon and phonon spectral energy density analysis

Cited by 9 publications

References 38 publications

Geopolymer Made from Kaolin, Diatomite, and Rice Husk Ash for Ceiling Thermal Insulation

Geopolymer Made from Kaolin, Diatomite, and Rice Husk Ash for Ceiling Thermal Insulation

Design, fabrication and properties of lightweight wear lining refractories: A review

Performance Improvement of Graded Bandgap Solar Cell via Optimization of Energy Levels Alignment in Si Quantum Dot, TiO2 Nanoparticles, and Porous Si

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