Highly Aligned Porous Nanocomposite Aerogels with Anisotropic Thermal Conductivity for Sub‐Ambient and Above‐Ambient Radiative Cooling DOI
Feng Xu,

Tianyi Zhu,

Yufeng Wang

et al.

Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 26, 2025

Abstract Scalable and cost‐efficient porous structural materials, characterized by their thermal insulation solar scattering properties, hold significant promise as radiative cooling solutions for zero‐energy regulation of objects subjected to sunlight high temperatures. However, the intrinsic restricts capacity effectively dissipate excess internal heat, thereby limiting applicability in scenarios within above‐ambient enclosed environments. Herein, a directional freeze‐casting strategy is presented preparing highly aligned nanocomposite aerogel. This aerogel demonstrates anisotropy factor 3.48, indicating markedly enhanced conductivity axial direction ascribing dual orientation skeletal walls space‐confined arrangement thermally conductive nanosheets. also reflectance 95.3% facilitated design hierarchical pore structures backscattering properties embedded 2D Consequently, this functions multi‐scenario cooler, achieving temperature reductions 3.3 15.9 °C sub‐ambient environments exposed study significantly expands materials cooling, addressing limitations conventional heat‐generating

Language: Английский

Fire‐Safe Aerogels and Foams for Thermal Insulation: From Materials to Properties DOI Open Access

Jiabing Feng,

Zhewen Ma,

Jianpeng Wu

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 19, 2024

The ambition of human beings to create a comfortable environment for work and life in sustainable way has triggered great need advanced thermal insulation materials past decades. Aerogels foams present prospects as insulators owing their low density, good insulation, mechanical robustness, even high fire resistance. These merits make them suitable many real-world applications, such energy-saving building materials, thermally protective aircrafts battery, warming fabrics. Despite advances, date there remains lack comprehensive yet critical review on the materials. Herein, recent progresses fire-safe thermal-insulating aerogels are summarized, pros/cons three major categories aerogels/foams (inorganic, organic hybrids) discussed. Finally, key challenges associated with existing discussed some future opportunities proposed. This is expected expedite development insulating help sustainable, safe, energy-efficient society.

Language: Английский

Citations

18
Aramid Nanofiber-Reinforced Graphene Oxide Frameworks for Durable and Flame-Resistant Fire Warning Sensors DOI Creative Commons
Qingshi Meng,

Yongqiang Zhu,

Shuangshan Li

et al.

Journal of Materials Research and Technology, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

Citations

2
Ambient drying fabrication of mechanically robust, flame-retardant, thermal-insulating cellulose/aramid nanofiber composite foam via freeze-casting combined ion cross-linking DOI
Zijing Liu, Lin Xu,

Xueyan Mai

et al.

Carbohydrate Polymers, Journal Year: 2025, Volume and Issue: 353, P. 123269 - 123269

Published: Jan. 14, 2025

Language: Английский

Citations

0
3D Large Space Warp-Knitted Composite Fabric with Heating and Insulation for Extremely Cold Environments DOI
Guangwei Shao, Wenlong Huang, Xin Zhang

et al.

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: March 4, 2025

The extremely cold environment restricts certain activities, making the preparation of a material with both heating and insulation functions significant challenge. This study presents large space warp-knitted composite fabric (LSWCF) as an electric inflatable three-dimensional structure. It is designed developed from three modes to mitigate heat loss. top layer LSWCF combined film layer, showing high efficiency (577.33 °C/(W·cm-2)), electrothermal conversion (95%), excellent conductivity (12.5 S/cm). bottom coated TiO2/WPU coatings thermal radiation layer. inflated retains substantial volume still air within its middle exhibits low (0.037 W·m-1·K-1), resulting minimization loss due convection conduction. LSWCF's radiant coating, on other hand, reduces through directed radiation. Contributed structural design, demonstrates enhanced ability generate at temperatures (up 35 °C -20 °C, 980 W·m-2) compared existing literature. offers novel strategy for development materials use in environments.

Language: Английский

Citations

0
Highly Hydrophobic SiO2/TiO2 Coatings for Thermal Protection: Enhancing Flame Retardancy and Thermal Insulation Performance of Aramid Fabrics DOI Open Access
Xia Jiang, Hermela Ejegu,

Qingshuai Yan

et al.

Advanced Engineering Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 26, 2025

Aramid fabrics are used as substrates, with silica (SiO 2 ) and titanium dioxide (TiO particles serving functional coating materials to enhance the comprehensive performance of flame‐retardant meet diverse application requirements. This study investigates effects aramid fabric surface pretreatment, SiO coatings varying mass fractions, TiO composite on thermal‐insulation performance, water resistance, tensile properties. The results show that coated 15% fraction exhibits best a maximum temperature difference 6 °C between heat source. /TiO reduced thermal conductivity by 15.8%. significantly smaller burn areas than base fabric, an increased hydrophobicity 142.9° 22% improvement in strength. can their providing valuable insights for developing personal protective equipment.

Language: Английский

Citations

0
Self-adaptive and large-area sprayable thermal management coatings for energy saving DOI Creative Commons
Peng Zhou, Gening Jiang, Yuyan Wang

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: April 22, 2025

Self-adaptive thermal management over large areas is highly attractive since single-mode radiative cooling materials lead to undesired overcooling. However, it remains a challenge that dual-mode switchable require artificial stimuli or additional energy for switching between heating and modes. Here, different from driven by energy, we propose an autonomously self-adaptive dual-modal coating with assembled micro-heterostructures can engender the multistage scattering of incident light. The resultant demonstrates 92% solar reflectivity 93% emissivity in hot condition. More significantly, reaches 60% visible light optical modulation, which attributed formation disruption conjugation region chromogenic molecules, prevent overcooling cold A thermal-switchable fabric further fabricated via large-area spraying processes, demonstrating 2.5 °C warmer condition 8.7 cooler compared white samples. highlights importance large-scale manufacturing temperature-adaptive materials, providing insights into application dynamic garment, camping, building other fields.

Language: Английский

Citations

0
Highly Aligned Porous Nanocomposite Aerogels with Anisotropic Thermal Conductivity for Sub‐Ambient and Above‐Ambient Radiative Cooling DOI
Feng Xu,

Tianyi Zhu,

Yufeng Wang

et al.

Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 26, 2025

Abstract Scalable and cost‐efficient porous structural materials, characterized by their thermal insulation solar scattering properties, hold significant promise as radiative cooling solutions for zero‐energy regulation of objects subjected to sunlight high temperatures. However, the intrinsic restricts capacity effectively dissipate excess internal heat, thereby limiting applicability in scenarios within above‐ambient enclosed environments. Herein, a directional freeze‐casting strategy is presented preparing highly aligned nanocomposite aerogel. This aerogel demonstrates anisotropy factor 3.48, indicating markedly enhanced conductivity axial direction ascribing dual orientation skeletal walls space‐confined arrangement thermally conductive nanosheets. also reflectance 95.3% facilitated design hierarchical pore structures backscattering properties embedded 2D Consequently, this functions multi‐scenario cooler, achieving temperature reductions 3.3 15.9 °C sub‐ambient environments exposed study significantly expands materials cooling, addressing limitations conventional heat‐generating

Language: Английский

Citations

0