Atomistic metrics of BaSO$_4$ as an ultra-efficient radiative cooling material: a first-principles prediction

Tong, Zhen; Peoples, Joseph; Li, Xiangyu; Yang, Xiaolong; Bao, Hua; Ruan, Xiulin

doi:10.48550/arxiv.2101.05053

Cited by 3 publications

(3 citation statements)

References 56 publications

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“…A candidate dielectric particle should have a larger band gap than the energy of solar photons (0.49-4.13 eV) to avoid sunlight absorbance. [17] Moreover, a higher refractive index particle is more favorable, because a large dielectric contrast with the matrix leads to stronger scattering of individual particles, resulting in greater reflection.…”

Section: Thermal-optically Designing a Multifunctional Photonic Struc...mentioning

confidence: 99%

“…A wide band gap generally leads to a low refractive index. [17,18] Existing dielectric particles, such as, SiO 2 , Al 2 O 3 , and BaSO 4 have a very wide band gap (≈9, 8.8, and 7.6 eV, respectively). Their refractive indexes (≈1.46, 1.78, and 1.64, respectively, at 500-µm wavelength) do not have a high enough contrast with that (≈1.5) of the polymer matrix, resulting in low scattering efficiency.…”

Section: Thermal-optically Designing a Multifunctional Photonic Struc...mentioning

confidence: 99%

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Thermo‐Optically Designed Scalable Photonic Films with High Thermal Conductivity for Subambient and Above‐Ambient Radiative Cooling

Wang

Fan

et al. 2021

Adv Funct Materials

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125

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Radiative cooling is a promising passive cooling technology that reflects sunlight and emits heat to deep space without any energy consumption. Current research mainly focuses on cooling non‐heat‐generating objects (e.g., water) to a deep subambient temperature under sunlight. Toward real‐world applications, however, cooling outdoor objects that generate tremendous heat and have a temperature higher than ambient (e.g., communication base stations and data centres) remains a challenge. Herein, a scalable photonic film is prepared by introducing 2D dielectric nanoplates with high backward scattering efficiency into a polymer using a simulation aided thermo‐optical design. It is demonstrated that the dielectric nanoplates can break the trade‐off between optical reflection and thermal dissipation of conventional radiative coolers. The photonic film exhibits superior solar reflectance (98%) and has a stronger heat dissipation ability compared to the matrix. It exhibits ≈4 °C subambient cooling performance under direct sunlight and ≈9 °C cooling performance at night. Moreover, it also demonstrates remarkable above‐ambient cooling performance by reducing the underlying heater temperature of ≈18 °C in comparison with traditional polymers under sunlight. The dielectric nanoplates reported here provide an innovative strategy for applications related to light management beyond subambient and above‐ambient radiative cooling.

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Section: Thermal-optically Designing a Multifunctional Photonic Struc...mentioning

confidence: 99%

Section: Thermal-optically Designing a Multifunctional Photonic Struc...mentioning

confidence: 99%

Thermo‐Optically Designed Scalable Photonic Films with High Thermal Conductivity for Subambient and Above‐Ambient Radiative Cooling

Wang

Fan

et al. 2021

Adv Funct Materials

Self Cite

125

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show abstract

“…BaSO 4 has a high electronic band gap of about 6 eV, which can effectively reduce the absorption in the UV band. [39] As can be seen from Figure 6E, the addition of BaSO 4 makes the film reflect in the UV region (200 ~400 nm), and when the addition amount reaches 50%, the reflectivity to the UV band is above 80%. While obtaining reflected UV light, the composite film can also reflect NIR light, which provides radiative cooling performance.…”

Section: Resultsmentioning

confidence: 87%

A radiative cooling, anti‐corrosion multifunctional composite coating derived from Jatropha (Jatropha curcas L.) oil

Chen

Sun

2022

Polymer Engineering & Sci

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Here, a new application from Jatropha (Jatropha curcas L.) oil was successfully proposed to develop a multifunctional composite coating using Jatropha oil (JO) as a raw material to replace traditional non‐renewable chemical materials. Here, a new application of Jatropha oil is proposed to develop a multifunctional composite coating using Jatropha oil as a raw material instead of traditional non‐renewable chemical materials. To achieve this goal, Jatropha oil first needs to be made into refined Jatropha oil (RJO) by degumming, deacidification, decolorization, and deodorization. The RJO was then subjected to epoxidation to obtain epoxidized Jatropha oil (EJO), and the optimal epoxidation conditions were explored. Finally, EJO was synthesized as acrylate and barium sulfate (BaSO4) was added as inorganic filler to prepare a composite coating. The results showed that the thermal decomposition temperature of the composite coating was as high as 451°C, and the composite coating showed the best mechanical properties when the filling amount of BaSO4 reached 40%. The composite coating has a reflectivity of over 80% in the UV region and can reach a contact angle of 108 ° with excellent hydrophobicity, which can play a self‐cleaning role. In addition, the composite coating is also immersed in acid and alkali solution for 30 days, it has less mass loss and shows excellent acid and alkali resistance, which can play the role of anti‐corrosion. The composite coating can be attached to the surface of wood, glass, metal, plastic, and other materials to provide protection for the materials, which has good application prospects. This pioneering work provides an opportunity to promote JO with depressed application market in industrial production.

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Semi-analytical technique for the design of disordered coatings with tailored optical properties

2023

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Disordered media coatings are finding increasing use in applications such as day-time radiative cooling paints and solar thermal absorber plate coatings which require tailored optical properties over a broad spectrum ranging from visible to far-IR wavelengths. Both monodisperse and polydisperse configurations with thickness of coatings up to 500 µm are currently being explored for use in these applications. In such cases it becomes increasingly important to explore utility of analytical and semi-analytical methods for design of such coatings to help reduce the computational cost and time for design. While well-known analytical methods such as Kubelka-Munk and four-flux theory have previously been used for analysis of disordered coatings, analysis of their utility has so far in literature been restricted to either solar spectrum or IR but not simultaneously over the combined spectrum as required for the above applications. In this work, we have analysed the applicability of these two analytical methods for such coatings over the entire wavelength range from visible to IR, and based on observed deviation from exact numerical simulation we propose a semi-analytical technique to aid in the design of these coatings with significant computational cost savings.

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Atomistic metrics of BaSO$_4$ as an ultra-efficient radiative cooling material: a first-principles prediction

Cited by 3 publications

References 56 publications

Thermo‐Optically Designed Scalable Photonic Films with High Thermal Conductivity for Subambient and Above‐Ambient Radiative Cooling

Thermo‐Optically Designed Scalable Photonic Films with High Thermal Conductivity for Subambient and Above‐Ambient Radiative Cooling

A radiative cooling, anti‐corrosion multifunctional composite coating derived from Jatropha (Jatropha curcas L.) oil

Semi-analytical technique for the design of disordered coatings with tailored optical properties

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