Multifunctional Nanostructures with Controllable Band Gap Giving Highly Stable Infrared Emissivity for Smart Thermal Management.
Multifunctional Nanostructures with Controllable Band Gap Giving Highly Stable Infrared Emissivity for Smart Thermal Management.
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DOI：
10.1021/acsnano.2c09737
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发表时间：
2023-01-09
期刊：
影响因子：
17.1
通讯作者：
Silva, S. Ravi P.
中科院分区：
文献类型：
--
作者：
Delkowski, Michal;Anguita, Jose Virgilio;Smith, Christopher Toby Gibb;Silva, S. Ravi P.
关键词：
热控制对于保证最先进的电子设备或系统的最佳性能至关重要。在太空中，轨道卫星面临着高热梯度、加热以及由太阳差异照明引起的不同热负荷的问题。当今最先进的热控制系统提供了保护;然而，它们体积庞大，限制了有效载荷的质量和功率预算。在这里，我们开发了一种轻质的光学超晶格纳米屏障结构，以提供智能热控制解决方案。该结构由水分和除气物理屏障（MOB）与原子氧（AO）-UV保护功能相结合组成。纳米屏障通过控制各个层的光学间隙来展现光的透射和反射，以实现高红外发射率和跨其他波长的可变太阳能吸收率（最小ΔαS = 0.30）。多功能涂料可通过定制的室温工艺应用于热敏基材。我们展示了增强的稳定性，能量收集能力，并通过促进辐射冷却和设施，在轨道上主动自我重构节省电力。通过这种方式，还证明了在空间合格和非机械控制的复合材料结构上的工作温度从120 °C降低到160 °C。
Thermal control is essential to guarantee the optimal performance of most advanced electronic devices or systems. In space, orbital satellites face the issues of high thermal gradients, heating, and different thermal loads mediated by differential illumination from the Sun. Todaýs state-of-the-art thermal control systems provide protection; however, they are bulky and restrict the mass and power budgets for payloads. Here, we develop a lightweight optical superlattice nanobarrier structure to provide a smart thermal control solution. The structure consists of a moisture and outgassing physical barrier (MOB) coupled with atomic oxygen (AO)–UV protection functionality. The nanobarrier exhibits transmission and reflection of light by controlling the optical gap of individual layers to enable high infrared emissivity and variable solar absorptivity (minimum ΔαS = 0.30) across other wavelengths. The multifunctional coating can be applied to heat-sensitive substrates by means of a bespoke room-temperature process. We demonstrate enhanced stability, energy-harvesting capability, and power savings by facilitating the radiation cooling and facility for active self-reconfiguration in orbit. In this way, the reduction of the operating temperature from ∼120 to ∼60 °C on space-qualified and nonmechanically controlled composite structures is also demonstrated.
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