Nanoparticle-polymer hybrid dual-layer coating with broadband solar reflection for high-performance daytime passive radiative cooling

Lin, Kaixin; Du, Yu‐Zhou; Chen, Siru; Chao, Luke; Lee, Hau Him; Ho, Tsz Chung; Zhu, Yihao; Zeng, Yijun; Pan, Aiqiang; Tso, Chi Yan

doi:10.1016/j.enbuild.2022.112507

Cited by 26 publications

(7 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We demonstrated the cooling performance of our ceramic using a custom-designed thermal setup ( 27 ) in Hong Kong and compared it to that of commonly used white commercial tiles as a control ( R solar = 76.2%, ε AW = 88.5%) (Fig. 3A and table S1).…”

Section: Cooling Performance Assessmentmentioning

confidence: 99%

“…However, the development of a daytime PRC material with both high R solar and practicality for outdoor application is challenging. In contrast to patterned and periodic optical designs that are small-scale and costly, random media, such as particles (21)(22)(23)(24)(25)(26)(27) and micropores (28)(29)(30)(31)(32)(33)(34)(35), have recently gained attention for achieving desirable daytime PRC. Researchers have investigated disordered designs, such as those of particle-doped polymers (21)(22)(23)(24)(25)(26)(27), aerogels (28), porous membranes (29)(30)(31)(32)(33), fibers (34,36), and delignified wood (35).…”

mentioning

confidence: 99%

“…In contrast to patterned and periodic optical designs that are small-scale and costly, random media, such as particles (21)(22)(23)(24)(25)(26)(27) and micropores (28)(29)(30)(31)(32)(33)(34)(35), have recently gained attention for achieving desirable daytime PRC. Researchers have investigated disordered designs, such as those of particle-doped polymers (21)(22)(23)(24)(25)(26)(27), aerogels (28), porous membranes (29)(30)(31)(32)(33), fibers (34,36), and delignified wood (35). An inherent advantage of these designs is their ability to obviate the need for intricate parameter control, affording simplicity and scalability.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Hierarchically structured passive radiative cooling ceramic with high solar reflectivity

Lin,

Chen,

Zeng

et al. 2023

Science

Self Cite

133

View full text Add to dashboard Cite

Passive radiative cooling using nanophotonic structures is limited by its high cost and poor compatibility with existing end uses, whereas polymeric photonic alternatives lack weather resistance and effective solar reflection. We developed a cellular ceramic that can achieve highly efficient light scattering and a near-perfect solar reflectivity of 99.6%. These qualities, coupled with high thermal emissivity, allow the ceramic to provide continuous subambient cooling in an outdoor setting with a cooling power of >130 watts per square meter at noon, demonstrating energy-saving potential on a worldwide scale. The color, weather resistance, mechanical robustness, and ability to depress the Leidenfrost effect are key features ensuring the durable and versatile nature of the cooling ceramic, thereby facilitating its commercialization in various applications, particularly building construction.

show abstract

Section: Cooling Performance Assessmentmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Hierarchically structured passive radiative cooling ceramic with high solar reflectivity

Lin,

Chen,

Zeng

et al. 2023

Science

Self Cite

133

View full text Add to dashboard Cite

show abstract

“…NIR shielding coating has received wide attention for its ease of preparation, low cost, and strong scalability. It is made by introducing dielectric particles into the polymer matrix to achieve multiple scattering of sunlight with different refractive indices to create an interface contrast with the dielectric. − The research on NIR shielding coating is mainly about TiO 2 particle coating and SiC/SiO 2 particle coating, which is aimed at investigating the impact of the particle volume fraction and coating thickness on the optical properties of color coatings. − …”

Section: Introductionmentioning

confidence: 99%

A Smart Window with Passive Radiative Cooling and Switchable Near-Infrared Light Transmittance via Molecular Engineering

Ma,

Zhang,

Yang

et al. 2024

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Smart windows with synergetic light modulation have heightened demands for applications in smart cars and novel buildings. However, improving the on-demand energy-saving efficiency is quite challenging due to the difficulty of modulating sunlight with a broad bandwidth in an energy-saving way. Herein, a smart window with switchable near-infrared light transmittance and passive radiative cooling is prepared via a monomer design strategy and photoinduced polymerization. The effects of hydrogen bonds and fluorine groups in acrylate monomers on the electro-optical properties as well as microstructures of polymer-dispersed liquid crystal films have been systematically studied. Some films show a high contrast ratio of 90.4 or a low threshold voltage (V th ) of 2.0 V, which can be roll-to-roll processed in a large area. Besides, the film has a superior indoor temperature regulation ability due to its passive radiative cooling and controllable near-infrared light transmittance properties. Its radiative cooling efficiency is calculated to be 142.69 W/m 2 and NIR transmittance could be switched to below 10%. The introduction of a carboxylic monomer and fluorinated monomer into the system endows the film with a highly efficient temperature management capability. The film has great potential for applications in fields such as flexible smart windows, camouflage materials, and so on.

show abstract

“…Although it can be partially mitigated by lowering the concentration of microparticles, it leads to an inevitable decrease in the cooling performance of films. These days, several solutions to these challenges have been proposed by utilizing volatile fluids such as toluene and acetone as a buffer medium [43,44]. However, employing toxic materials such as toluene and acetone raises concerns about the feasibility of the large-scale production and practical applications of radiative cooling.…”

Section: Introductionmentioning

confidence: 99%

Development of High-Performance Flexible Radiative Cooling Film Using PDMS/TiO2 Microparticles

Jung,

Yoon,

Kim

et al. 2023

Micromachines

View full text Add to dashboard Cite

Radiative cooling, which cools an object below its surrounding temperature without any energy consumption, is one of the most promising techniques for zero-energy systems. In principle, the radiative cooling technique reflects incident solar energy and emits its thermal radiation energy into outer space. To achieve maximized cooling performance, it is crucial to attain high spectral reflectance in the solar spectrum (0.3–2.5 μm) and high spectral emittance in the atmospheric window (8–13 μm). Despite the development of various radiative cooling techniques such as photonic crystals and metamaterials, applying the cooling technology in practical applications remains challenging due to its low flexibility and complicated manufacturing processes. Here, we develop a high-performance radiative cooling film using PDMS/TiO2 microparticles. Specifically, the design parameters such as microparticle diameter, microparticle volume fraction, and film thickness are considered through optical analysis. Additionally, we propose a novel fabrication process using low viscosity silicone oil for practical fabrication. The fabricated film accomplishes 67.1 W/m2 of cooling power, and we also analyze the cooling performance difference depending on the fabrication process based on the measurement and optical calculation results.

show abstract

Nanoparticle-polymer hybrid dual-layer coating with broadband solar reflection for high-performance daytime passive radiative cooling

Cited by 26 publications

References 40 publications

Hierarchically structured passive radiative cooling ceramic with high solar reflectivity

Hierarchically structured passive radiative cooling ceramic with high solar reflectivity

A Smart Window with Passive Radiative Cooling and Switchable Near-Infrared Light Transmittance via Molecular Engineering

Development of High-Performance Flexible Radiative Cooling Film Using PDMS/TiO2 Microparticles

Contact Info

Product

Resources

About