Prospects for applying BaSO4 powders as pigments for spacecraft thermal control coatings

Михайлов, М. М.; Yuryev, S.A.; Lapin, A. N.

doi:10.1016/j.actaastro.2019.09.009

Cited by 33 publications

(5 citation statements)

References 15 publications

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“…It can be observed from the formula that the Planck's constant and the velocity of light are both constants and the critical absorption wavelength is inversely proportional to the bandgap energy of the particles. The E g of BaSO 4 , TiO 2 , and ZnO is about 6, 3.04, and 3.37 eV, 16 which leads to the absorption spectra wavelengths of BaSO 4 particles being less than TiO 2 and ZnO. In terms of low absorption of sunlight corresponding to high solar reflectance, the reflectance of BaSO 4 proves better than TiO 2 and ZnO.…”

Section: Resultsmentioning

confidence: 99%

“…The entire solar reflectance of ASA/BaTiO 3 composites could be significantly improved from 40.81% to 70.96% and the indoor simulated irradiation temperature of ASA/BaTiO 3 composites descended from 35 to 25 C. Chen et al 15 designed and fabricated a novel type of phase-change microcapsules with an n-eicosane core and a BaSO 4 shell, which can be utilized as a coating for building temperature regulation. Research conducted by Mikhailov et al 16 demonstrates that BaSO 4 is effectively employed as a pigment for spacecraft thermal control coatings. Compared to TiO 2 and ZnO, BaSO 4 has been shown to have superior optical properties and radiation stability, making it well-suited for use as a pigment in spacecraft thermal control coatings.…”

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confidence: 99%

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Development of reflective cooling plasticized polyvinyl chloride/precipitated barium sulfate composites for building roof applications throughout entire solar wavebands

Han,

Yang,

Zhang

et al. 2023

Vinyl Additive Technology

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Barium sulfate (BaSO4) has high reflectance throughout entire solar waveband (280–2500 nm). In this study, the melt blending method was used to incorporate BaSO4 into a plasticized polyvinyl chloride (PVC) matrix. The aim was to create composites that exhibit excellent reflective cooling performance in the solar waveband, specifically for use in building roofs. By increasing the content of BaSO4 from 0 to 200 phr, the total reflectance of the samples in the solar waveband showed significant improvement, rising from 6% to 48.8%. Furthermore, the thermal conductivity of the samples accordingly emerged apparent enhancement, increasing by 46.3% from 0.178 to 0.262 W m−1 K−1. Additionally, when subjected to irradiation by a solar simulator under a solar light intensity of 1000 W/m2 for 1 h, the indoor simulated irradiation temperature decreased from 41.4 to 27.4°C.Highlights White plasticized polyvinyl chloride (PVC) films with reflective cooling performance were prepared. The solar reflectance and cooling performance of PVC was enhanced by BaSO4. The reflectance mechanism of BaSO4 in PVC was established.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Development of reflective cooling plasticized polyvinyl chloride/precipitated barium sulfate composites for building roof applications throughout entire solar wavebands

Han,

Yang,

Zhang

et al. 2023

Vinyl Additive Technology

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“…In addition, the complex crystal structure and proper bonding strength of BaSO 4 allow for the presence of a large number of central optical phonon modes in the infrared active region in the Reststrahen band, which results in a higher emissivity in the sky window compared with other inorganic particles . Conventional BaSO 4 nanopowders are easy to agglomerate, which may heavily affect the radiative cooling effect and the mechanical properties of inorganic composites. ,− Therefore, the dispersibility of nanoparticles is crucial to improve the performance of composites. Nanodispersions are nanoparticles that can be uniformly dispersed in liquid media and remain stable over time.…”

Section: Introductionmentioning

confidence: 99%

BaSO₄-Epoxy Resin Composite Film for Efficient Daytime Radiative Cooling

Wu,

Zou,

et al. 2023

Langmuir

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Conventional cooling methods are based on active cooling technology by air conditioning, which consumes a large amount of energy and emits greenhouse gases. Radiative cooling is a novel promising passive cooling technology that uses external space as the cooling source and requires no additional energy consumption. Herein, we propose an approach to prepare highly dispersed BaSO4 nanoparticles (NPs) using a direct precipitation method combined with the in situ surface modification technology. The as-prepared PVP-modified BaSO4 NPs with an average size of 20 nm can be stably dispersed in ethanol for more than 6 months and then were used as building blocks to prepare spherical BaSO4 clusters with an average size of 0.9 μm using a scalable spray drying technique. The BaSO4 NPs/clusters (mass ratio 1:1) were used for preparing radiative cooling epoxy resin film, showing a high solar reflectance of 71% and a high sky window emissivity of 0.94. More importantly, this composite film displays superior radiative cooling performance, which can reduce the ambient temperature by 13.5 °C for the indoor test and 7 °C for the outdoor test. Compared with the commercial BaSO4 filled film, our BaSO4-epoxy resin composite film offers advantages not only in radiative cooling but also in mechanical properties with a 16.6% increase of tensile strength and 40.1% increase of elongation at break, demonstrating its great application potential in the field of building air conditioning.

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“…In recent years, sulfate crystals have been actively studied in the general flow of searching new optical materials transparent in the UV spectral range, and many novel materials with interesting linear and nonlinear optical properties were discovered [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. Some specific features were found in the coordination of (SO 4 ) 2− anions in the crystal lattice [41].…”

Section: Introductionmentioning

confidence: 99%

Exploration of the Crystal Structure and Thermal and Spectroscopic Properties of Monoclinic Praseodymium Sulfate Pr2(SO4)3

et al. 2022

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Praseodymium sulfate was obtained by the precipitation method and the crystal structure was determined by Rietveld analysis. Pr2(SO4)3 is crystallized in the monoclinic structure, space group C2/c, with cell parameters a = 21.6052 (4), b = 6.7237 (1) and c = 6.9777 (1) Å, β = 107.9148 (7)°, Z = 4, V = 964.48 (3) Å3 (T = 150 °C). The thermal expansion of Pr2(SO4)3 is strongly anisotropic. As was obtained by XRD measurements, all cell parameters are increased on heating. However, due to a strong increase of the monoclinic angle β, there is a direction of negative thermal expansion. In the argon atmosphere, Pr2(SO4)3 is stable in the temperature range of T = 30–870 °C. The kinetics of the thermal decomposition process of praseodymium sulfate octahydrate Pr2(SO4)3·8H2O was studied as well. The vibrational properties of Pr2(SO4)3 were examined by Raman and Fourier-transform infrared absorption spectroscopy methods. The band gap structure of Pr2(SO4)3 was evaluated by ab initio calculations, and it was found that the valence band top is dominated by the p electrons of oxygen ions, while the conduction band bottom is formed by the d electrons of Pr3+ ions. The exact position of ZPL is determined via PL and PLE spectra at 77 K to be at 481 nm, and that enabled a correct assignment of luminescent bands. The maximum luminescent band in Pr2(SO4)3 belongs to the 3P0 → 3F2 transition at 640 nm.

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Prospects for applying BaSO4 powders as pigments for spacecraft thermal control coatings

Cited by 33 publications

References 15 publications

Development of reflective cooling plasticized polyvinyl chloride/precipitated barium sulfate composites for building roof applications throughout entire solar wavebands

Development of reflective cooling plasticized polyvinyl chloride/precipitated barium sulfate composites for building roof applications throughout entire solar wavebands

BaSO₄-Epoxy Resin Composite Film for Efficient Daytime Radiative Cooling

Exploration of the Crystal Structure and Thermal and Spectroscopic Properties of Monoclinic Praseodymium Sulfate Pr2(SO4)3

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Prospects for applying BaSO4 powders as pigments for spacecraft thermal control coatings

Cited by 33 publications

References 15 publications

Development of reflective cooling plasticized polyvinyl chloride/precipitated barium sulfate composites for building roof applications throughout entire solar wavebands

Development of reflective cooling plasticized polyvinyl chloride/precipitated barium sulfate composites for building roof applications throughout entire solar wavebands

BaSO4-Epoxy Resin Composite Film for Efficient Daytime Radiative Cooling

Exploration of the Crystal Structure and Thermal and Spectroscopic Properties of Monoclinic Praseodymium Sulfate Pr2(SO4)3

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Product

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BaSO₄-Epoxy Resin Composite Film for Efficient Daytime Radiative Cooling