Hierarchical Microspheres-Based Composite Materials with TiO2-Coated SiO2 Combined with BaSO4 or PNIPAM for Radiative Cooling

IF 8 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Jiefeng Li, Ming Fu, Heling Zhang, Chenhui Wei, Dawei He, Yongsheng Wang
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Abstract

Microspheres dispersed in composites exhibit excellent infrared emissivity for radiative cooling applications, which reflect sunlight and passively dissipate heat into space without electricity. In this study, hierarchical microspheres (HMs) with a two-tier structure, composed of SiO2, TiO2-coated SiO2, BaSO4, or PNIPAM, are incorporated into PDMS-based composites. These microspheres feature larger spheres assembled from submicrometer-scale nanoparticles and are fabricated via microfluidics to enhance radiative cooling performance. SiO2 HMs not only boost visible light reflection and exhibit structural color through a photonic stop band but also achieve an average emissivity of 97.55% in the atmospheric window. Both experimental and simulated results show that HMs enhance the emissivity performance of the composite material compared with solid SiO2 microspheres of the same diameter. Additionally, applying TiO2 coating to SiO2 HMs further increases the overall emissivity to 98.05%. Incorporating BaSO4 HMs also increased the average visible reflectivity to 96.56%, while maintaining superior infrared emissivity at 97.58%. The inclusion of PNIPAM spheres enabled temperature-responsive transmissivity, with the composite materials containing PNIPAM and SiO2 HMs preserving high infrared emissivity in the atmospheric window. These HM structures exhibit excellent solar reflectivity and thermal emission, making them effective for radiative cooling.

Abstract Image

层状微球基复合材料与二氧化钛包覆SiO2结合BaSO4或PNIPAM辐射冷却
分散在复合材料中的微球在辐射冷却应用中表现出优异的红外发射率,可以反射阳光并在没有电的情况下被动地将热量散发到太空中。在本研究中,将由SiO2、二氧化钛涂层SiO2、BaSO4或PNIPAM组成的双层结构的分层微球(HMs)加入到pdms基复合材料中。这些微球的特点是由亚微米级纳米颗粒组装而成的更大的球体,并通过微流体制造来增强辐射冷却性能。SiO2 HMs不仅通过光子阻挡带增强可见光反射并呈现结构色,而且在大气窗口内平均发射率达到97.55%。实验和模拟结果均表明,与相同直径的固体SiO2微球相比,HMs提高了复合材料的发射率性能。此外,在SiO2 HMs表面涂覆TiO2涂层,整体发射率进一步提高到98.05%。加入BaSO4 HMs后,平均可见光反射率提高到96.56%,同时红外发射率保持在97.58%。PNIPAM微球的加入实现了温度响应透射率,含有PNIPAM和SiO2 HMs的复合材料在大气窗口中保持了高红外发射率。这些HM结构具有优异的太阳反射率和热辐射,使其有效地进行辐射冷却。
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来源期刊
Advanced Optical Materials
Advanced Optical Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS
CiteScore
13.70
自引率
6.70%
发文量
883
审稿时长
1.5 months
期刊介绍: Advanced Optical Materials, part of the esteemed Advanced portfolio, is a unique materials science journal concentrating on all facets of light-matter interactions. For over a decade, it has been the preferred optical materials journal for significant discoveries in photonics, plasmonics, metamaterials, and more. The Advanced portfolio from Wiley is a collection of globally respected, high-impact journals that disseminate the best science from established and emerging researchers, aiding them in fulfilling their mission and amplifying the reach of their scientific discoveries.
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