Department of Mechanical Engineering, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo, 135-8548, Japan.
School of Engineering, Tohoku University, 6-6, Aoba, Aramaki-aza, Aoba-ku, Sendai, Miyagi, 980-8579, Japan.
Sci Rep. 2018 Jan 19;8(1):1196. doi: 10.1038/s41598-018-19498-5.
Chameleons have a diagnostic thermal protection that enables them to live under various conditions. Our developed special radiative control therefore is inspired by the chameleon thermal protection ability by imitating its two superposed layers as two pigment particles in one coating layer. One particle imitates a chameleon superficial surface for color control (visible light), and another particle imitates a deep surface to reflect solar irradiation, especially in the near-infrared region. Optical modeling allows us to optimally design the particle size and volume fraction. Experimental evaluation shows that the desired spectral reflectance, i.e., low in the VIS region and high in NIR region, can be achieved. Comparison between the measured and calculated reflectances shows that control of the particle size and dispersion/aggregation of particle cloud is important in improving the thermal-protection performance of the coating. Using our developed coating, the interior temperature decreases and the cooling load is reduced while keeping the dark tone of the object.
变色龙具有诊断性的热保护功能，使它们能够在各种条件下生存。因此，我们开发的特殊辐射控制受到变色龙热保护能力的启发，通过模仿其两层重叠的层作为一个涂层中的两个颜料颗粒。一个颗粒模仿变色龙的表面以进行颜色控制（可见光），另一个颗粒模仿深层表面以反射太阳辐射，特别是在近红外区域。光学建模允许我们优化设计颗粒尺寸和体积分数。实验评估表明，可以实现所需的光谱反射率，即在 VIS 区域低而在 NIR 区域高。测量和计算的反射率之间的比较表明，控制颗粒尺寸和颗粒云的分散/聚集对于改善涂层的热保护性能很重要。使用我们开发的涂层，在保持物体深色的同时，内部温度降低，冷却负荷降低。
