Mechanical Properties of Iron Powder-Reinforced Polyurea Elastomer DOI Open Access
Yiwen Feng, Yubo Liu

Journal of Composites Science, Journal Year: 2024, Volume and Issue: 8(11), P. 440 - 440

Published: Oct. 24, 2024

This study investigated the enhancement of mechanical and acoustic properties polyurea (PU) composites by incorporating iron microparticles (Fe). The Fe/PU were prepared using a mixing process, where evenly distributed within matrix via stirring. primary purpose this was to explore how varying volumes influence viscoelastic performance composites, with particular focus on applications in underwater stealth technology. Dynamic analysis conducted effect powder volume fraction i.e., temperature-dependent storage moduli (E′), loss (E″) factor (tanδ). intrinsic components nature interface between phases determined dynamic composite. It found that composite both increased as increased, which indicates incorporation appreciably induces reinforcing effects. Moreover, tanδ curve generally had broader widths peak than those pure polyurea, showed better damping behavior. height peaks depended content, glass transition temperature (measured at maximum value tanδ) shifted toward higher temperatures increased. Also, compression stress–strain curves obtained universal testing machine indicated addition improved compressive strength energy capacity In addition, absorption coefficient increase powder, sample thickness be effective improving low-frequency sound absorption.

Language: Английский

The Applications and Challenges of Nanofluids as Coolants in Data Centers: A Review DOI Creative Commons
Le Sun, Jiafeng Geng, Kaijun Dong

et al.

Energies, Journal Year: 2024, Volume and Issue: 17(13), P. 3151 - 3151

Published: June 26, 2024

With the rapid development of artificial intelligence, cloud computing and other technologies, data centers have become vital facilities. In construction operation centers, how to effectively solve problem cooling energy saving is key problem. this review article, a critical recent research regarding application nanofluids in center are put forward. Many different aspects such as classification nanoparticles, base fluid components, types structures heat exchangers were discussed. Furthermore, some advanced up-to-date apparatus theoretical models utilizing coolants reviewed described detail. Lastly, but not least, potential directions future challenges faced by researchers industry field proposed conclusion, used novel exchange medium, which has been widely proven areas, can also conspicuously improve technology future.

Language: Английский

Citations

6
Design and Optimization of NR-Based Stretchable Conductive Composites Filled with MoSi2 Nanoparticles and MWCNTs: Perspectives from Experimental Characterization and Molecular Dynamics Simulations DOI Open Access
Ruifeng Jiang, Yanbin Ma,

Zhuojun Fan

et al.

Polymers, Journal Year: 2024, Volume and Issue: 16(11), P. 1444 - 1444

Published: May 21, 2024

Stretchable conductive composites play a pivotal role in the development of personalized electronic devices, skins, and artificial implant devices. This article explores fabrication characterization stretchable based on natural rubber (NR) filled with molybdenum disilicide (MoSi2) nanoparticles multi-walled carbon nanotubes (MWCNTs). Experimental molecular dynamics (MD) simulations are employed to investigate static dynamic properties composites, including morphology, glass transition temperature (Tg), electrical conductivity, mechanical behavior. Results show that addition MoSi2 enhances dispersion MWCNTs within NR matrix, optimizing formation network. Dynamic analysis (DMA) confirms Tg reduction influence content Tg. Mechanical testing reveals tensile strength increases content, an optimal ratio 4:1 MoSi2:MWCNTs. Electrical conductivity measurements demonstrate MoSi2/MWCNTs/NR exhibit enhanced reaching values at specific filler ratios. MD further support experimental findings, highlighting improving properties. Overall, study elucidates synergistic effects enhancing composites.

Language: Английский

Citations

1
Smart Polymer Composites for Electrical Heating: A Review DOI Open Access
A. V. Shchegolkov,

Aleksei V. Shchegolkov,

Vladimir V. Kaminskii

et al.

Journal of Composites Science, Journal Year: 2024, Volume and Issue: 8(12), P. 522 - 522

Published: Dec. 12, 2024

The paper presents an overview of conductive polymer composites based on thermosetting materials, thermoplastics, and elastomers modified with carbon nanotubes (CNTs). To impart properties to polymers, metal, carbon-dispersed or their combinations are used. inclusion dispersed materials in polymers is associated microstructural features, as well polymerization methods. Such methods melt mixing, solution technology, introduction fillers into the liquid phase composite subsequent due use a catalyst known. Polymer that capable conducting electric current changing under influence field, i.e., having one more functional purposes, called “smart” intelligent. One such application heating elements function adaptive energy consumption effect self-regulation temperature depending surrounding conditions. A wide variety determines range capabilities composite, including positive coefficient resistance (PTCR) required control properties. most effective filler for obtaining desired nanomaterials, particular, CNT. This fact CNTs nanosized material high bulk density at low weight, which allows electrical conductivity. Calculation model parameters containing nanostructures can be carried out using neural networks machine learning, give fundamentally new result. article contains sections assessment various types matrices thermosets, elastomers. electrically properties, options Ag, Au, Cu, Ni, Fe, considered. Methods introducing presented. Functional regulation mechanisms electrophysical processes considered, taking account resulting conductivity tunnel hopping An analysis heaters out, operating modes. Thus, conducted review modern scientific practical research field additives us assess prospects formation heating, technologies learning networks.

Language: Английский

Citations

1
Multi-Functional and Multi-Scale Aspects in Polymer Composites DOI Open Access
Md Najib Alam, Vineet Kumar

Polymers, Journal Year: 2024, Volume and Issue: 16(24), P. 3475 - 3475

Published: Dec. 13, 2024

Polymer composites have gained attention due to their multifunctionality and ability tune properties at multiple scales [...]

Language: Английский

Citations

1
Advances in Electrically and Thermally Conductive Functional Nanocomposites Based on Carbon Nanotubes DOI Open Access
A. V. Shchegolkov,

Aleksei V. Shchegolkov,

Vladimir V. Kaminskii

et al.

Polymers, Journal Year: 2024, Volume and Issue: 17(1), P. 71 - 71

Published: Dec. 30, 2024

The paper presents a review of CNTs synthesis methods and their application as functional filler to obtain polymer composites for various technical purposes strain gauges, electrical heating, anti-static coatings, electrically conductive compounds, etc. Various allow with different morphology structural properties be created, which expands the possibilities such nanoscale structures. Polymers can provide effects ‘shape memory’ self-repair mechanical defects. Different combinations polymers dispersed fillers influence change in thermal conductivity, well positive temperature coefficient resistance, makes it possible achieve effect self-regulation during heating. make form PTCR (positive resistance) elastomers at lower concentrations, preserve strength use more efficient modes heat generation. For improve sensitivity extend measurement range. thermoplastic provides operation electric heating level 200 °C (voltage 240 V), allows heaters operate power supply from household network. CNTs-based gauges condition monitoring composite materials.

Language: Английский

Citations

0
Mechanical Properties of Iron Powder-Reinforced Polyurea Elastomer DOI Open Access
Yiwen Feng, Yubo Liu

Journal of Composites Science, Journal Year: 2024, Volume and Issue: 8(11), P. 440 - 440

Published: Oct. 24, 2024

This study investigated the enhancement of mechanical and acoustic properties polyurea (PU) composites by incorporating iron microparticles (Fe). The Fe/PU were prepared using a mixing process, where evenly distributed within matrix via stirring. primary purpose this was to explore how varying volumes influence viscoelastic performance composites, with particular focus on applications in underwater stealth technology. Dynamic analysis conducted effect powder volume fraction i.e., temperature-dependent storage moduli (E′), loss (E″) factor (tanδ). intrinsic components nature interface between phases determined dynamic composite. It found that composite both increased as increased, which indicates incorporation appreciably induces reinforcing effects. Moreover, tanδ curve generally had broader widths peak than those pure polyurea, showed better damping behavior. height peaks depended content, glass transition temperature (measured at maximum value tanδ) shifted toward higher temperatures increased. Also, compression stress–strain curves obtained universal testing machine indicated addition improved compressive strength energy capacity In addition, absorption coefficient increase powder, sample thickness be effective improving low-frequency sound absorption.

Language: Английский

Citations

0