Fiber-particle-reinforced silica aerogels are widely applied in thermal insulation. Knowing their effective thermal conductivity (ETC) and radiative characteristics under high temperatures is necessary to improve their performance. This article first analyzes the radiation characteristics of silica aerogels doped with opacifier particles and reinforced fibers, and then a universal model is established to predict the ETC. Furthermore, the impacts of different parameters of opacifier particles and reinforced fibers on the thermal insulation performance of silica aerogels are investigated. The results indicate that SiC exhibits comparatively strong absorption characteristics, making it a good alternative for opacifiers to improve thermal insulation performance under high temperatures. For the given type and volume fraction of opacifier particles, there exists an optimal diameter and volume fraction to achieve the best insulation performance of silica aerogel under a certain temperature. Considering that SiO fibers exhibit a limited extinction capability and higher conductive thermal conductivity under high temperatures, for fiber-particle-reinforced silica aerogels, it is beneficial for their insulation performance to reduce the fiber volume fraction when the required mechanical properties are satisfied.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11121213 | PMC |
| http://dx.doi.org/10.3390/gels10050300 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Solar-Driven Thermally Regenerative Electrochemical Cells for Continuous Power Generation with Coupled Optical and Thermal Integration.
ACS Appl Mater Interfaces
January 2025
Shenzhen Key Laboratory of Intelligent Robotics and Flexible Manufacturing Systems, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
This study presents the development of a solar-driven thermally regenerative electrochemical cell (STREC) for continuous power generation. Key innovations include dual-function carbon-based electrodes for efficient solar absorption and electrochemical reactions, a transparent and ultrainsulating silica aerogel to maximize solar spectrum transmission while minimizing heat loss, and a compact heat exchanger to recover heat from hot cell streams. Under 1 sun conditions, the STREC achieves a power density of 912.
View Article and Find Full Text PDFIntegrating Aerogel into van der Waals Crystals for a High-Strength Thermal Insulator.
Nano Lett
January 2025
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea.
Achieving low thermal conductivity and high mechanical strength presents a material design challenge due to intrinsic trade-offs, such as the aerogel's porosity, impeding applications in construction, industry, and aerospace. This study presents a composite that incorporates a silica aerogel within a thermally expanded 2D layered vermiculite matrix. This design overcomes limitations imposed by van der Waals bonding lengths, typically less than 10 Å, which hinder aerogel integration with van der Waals crystals.
View Article and Find Full Text PDFEnhanced Thermal Safety of Hydrophobic SiO Aerogels Through Introduction of Layered Double Oxides.
Gels
December 2024
School of Resource and Safety Engineering, Central South University, Changsha 410083, China.
This research enhances the thermal safety of hydrophobic silica aerogel (HSA) by integrating layered double oxides (LDOs). XRD and FTIR confirm that the introduction of LDOs does not affect the formation of SA. The LDO/SA composites demonstrate a low density (0.
View Article and Find Full Text PDFDevelopment of cerium-doped porous composite aerogel using cellulose nanocrystals for enhanced CO capture and conversion.
J Colloid Interface Sci
December 2024
School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, PR China. Electronic address:
Reducing carbon dioxide (CO) levels in the atmosphere is crucial for combating global warming. One effective strategy involves using porous materials for the combined processes of CO capture and catalytic conversion. In this study, we developed composite aerogel materials using cellulose nanocrystals (CNCs) as templates, doped with cerium oxide, to enhance CO capture and conversion.
View Article and Find Full Text PDFVortex-Mixing Microfluidic Fabrication of Micafungin-Loaded Magnetite-Salicylic Acid-Silica Nanocomposite with Sustained-Release Capacity.
Materials (Basel)
November 2024
Department of Science and Engineering of Oxide Materials and Nanomaterials, National University of Science and Technology Politehnica Bucharest, 011061 Bucharest, Romania.
Iron oxide nanoparticles were synthesized using a vortex microfluidic system and subsequently functionalized with a primary shell of salicylic acid, recognized for its ability to increase the stability and biocompatibility of coated materials. In the second stage, the vortex platform was placed in a magnetic field to facilitate the growth and development of a porous silica shell. The selected drug for this study was micafungin, an antifungal agent well regarded for its effectiveness in combating fungal infections and identified as a priority compound by the World Health Organization (WHO).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!