生物灵感耐用白天辐射冷却木材:实现户外长时间使用
Chenyang Cai1, Xin Zhao1, Chao Miao1
1Co-Innovation Center of Efficient Processing and Utilization of Forest Resource, School of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China.
Nano letters
|March 7, 2025
概括
研究人员开发了一种持久的冷却木材材料,在长时间暴露在紫外线下后保持其效率. 这种可持续的木制冷器为节能白天辐射冷却应用提供了一个有前途的解决方案.
科学领域:
- 材料科学 材料科学 材料科学
- 可持续能源 可持续能源
- 纳米技术 纳米技术
背景情况:
- 白天的辐射冷却通过反射阳光和发射红外辐射来提供零能量散热.
- 基于木材的冷却器是可持续和经济的,但在紫外线 (UV) 辐射下降解,降低效率.
- 撒哈拉白银的结构功能关系激发了一种新的方法来提高木材的耐用性.
研究的目的:
- 开发一种户外耐用冷却木材 (DCW) 材料,具有增强的紫外线抵抗力和持续的冷却性能.
- 调查光子结构的组装,以改善太阳反射率和红外发射.
- 通过被动冷却来证明材料的节能潜力.
主要方法:
- 通过组装一个Mica@TiO2光子结构来修改脱线木材.
- 分析了结构完整性和组成,以了解抗紫外线的机制.
- 评估了阳光反射,红外发射,机械强度和在紫外线暴露下冷却效率.
主要成果:
- 该DCW实现了高太阳反射率 (0.958) 和红外发射率 (0.95).
- 该材料具有显著的机械强度 (47 MPa) 和优越的紫外线抵抗性.
- 在720小时的紫外线照射后,冷却效率保持在4.5°C,从而保持了木材的C-O-C骨架.
结论:
- 开发的DCW显示出出色的耐用性和持续的白天辐射冷却性能.
- 米卡@TiO2光子结构有效地保护木质基板免受紫外线降解.
- 这项工作为创造可持续,持久的辐射冷却材料提供了一条可行的途径,以节省能源.
相关概念视频
01:21Wood Products
75
Wood products encompass a broad range of materials crafted from wood strands, veneers, lumber, and even waste wood-like shreds, designed for both structural and nonstructural purposes. Various specialized wood products have been developed to enhance strength, durability, and versatility in building applications.
Glue-laminated wood, often referred to as glulam, combines multiple smaller pieces of dimensional lumber using adhesives to form a single, larger piece. Cross-laminated timber consists...
Glue-laminated wood, often referred to as glulam, combines multiple smaller pieces of dimensional lumber using adhesives to form a single, larger piece. Cross-laminated timber consists...
75
01:19Introduction to Wood
201
Wood, derived from trees, is a versatile and widely used construction material. Trees feature a trunk surrounded by a protective layer of dead bark. Beneath this outer layer lies the living bark, followed by the cambium, and then the sapwood which transitions into heartwood as it matures. At the center of the trunk is the pith. The age of a tree can be discerned by examining its growth rings, which are concentric bands visible in the trunk's cross-section.
The structural integrity of the...
The structural integrity of the...
201
01:22Thermal Insulation in Masonry Walls
101
In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
101
01:18Wood Panel Products
69
Wood panel products are essential materials used in construction for applications such as flooring, siding, and roofing, typically available in standard dimensions of 4 feet by 8 feet, with thicknesses varying from one-quarter of an inch to one and one-eighth inches. Among the most common types of wood panels is plywood, which is produced by gluing multiple layers of thin wood veneers under pressure. The grain of the outer veneers runs lengthwise, while the grains of the interior layers run...
69
01:21Masonry in Cold and Hot Weather Conditions
74
In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units...
Other key practices include keeping masonry units...
74
01:26Design Example: Sustainability in Concrete Building
151
As the construction industry moves towards more eco-friendly practices, concrete's adaptability and its ability to incorporate sustainable features make it a key material in the drive towards greener building solutions.
There are multiple approaches to achieve sustainability in a commercial concrete building. For instance, construct a concrete parking area under the building, utilizing pervious concrete paver blocks in open areas to facilitate rainwater collection through an underground...
There are multiple approaches to achieve sustainability in a commercial concrete building. For instance, construct a concrete parking area under the building, utilizing pervious concrete paver blocks in open areas to facilitate rainwater collection through an underground...
151