全面的热保护:多功能协同作用在分层结构的双氧化物纳米纤维气凝中
Zijian Zhao1,2, Shujing Li1,2, Han Ma3,2
1School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|November 21, 2025
概括
这项研究引入了一种新的陶纳米纤维气凝,具有独特的双氧化物结构,可增强热保护. 该材料表现出改进的机械稳定性和超低的导热性,解决了先进材料的脆性挑战.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 热力工程是热力工程中的一个.
背景情况:
- 陶纳米纤维气凝显示出热保护的希望,但遭受脆性.
- 开发强大高效的绝热材料对于高温应用至关重要.
研究的目的:
- 设计和制造一个层次的纤维化气凝,克服陶纳米纤维的脆性.
- 为了实现超低的导热率和在高温下异常的热力学稳定性.
主要方法:
- 精简的双氧化物纳米纤维的制造,具有密集的外/多孔核心架构.
- 气凝的密度,机械稳定性和导热性的表征.
- 在高温下的模拟空间-地面综合实验下进行评估.
主要成果:
- 新型气凝达到最低密度为8毫克·厘米-3和超低导热率为7mW·m-1·K-1.
- 在80%的压缩下,在广泛的温度范围 (-196至1300°C) 中表现出异常的机械稳定性.
- 在模拟的高温实验 (≈1200°C) 中观察到显著的耐热振动.
结论:
- 设计的陶纳米纤维气凝有效地解决了脆性,同时提供了卓越的热保护.
- 该材料的独特结构通过操纵传热通路来增强热绝缘.
- 在实际应用中,气凝显示出作为噪声吸收和催化转换的多功能平台的潜力.
相关概念视频
01:19Mechanism of heat transfer
1.8K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
1.8K
01:20Mechanisms of Heat Transfer II
4.2K
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
4.2K
01:14Mechanisms of Heat Transfer
1.6K
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
1.6K
01:14Mechanisms of Heat Transfer I
5.9K
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
5.9K