Dynamic Wettability Behavior of Emerging Ultrawhite Radiative Cooling Paints
Abstract Outdoor radiative cooling surfaces passively lose heat by reflecting solar irradiation and emitting infrared radiation to cold deep space through the atmospheric sky window (8–13 µm), thereby achieving sub‐ambient temperature. Ultrawhite radiative cooling paints are an emerging technology o...
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2025-08-01
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| Series: | Advanced Materials Interfaces |
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| Online Access: | https://doi.org/10.1002/admi.202500288 |
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| author | Orlando G. Rivera González Abdulrahman K. Aljwirah Andrea L. Felicelli Xiulin Ruan Justin A. Weibel |
| author_facet | Orlando G. Rivera González Abdulrahman K. Aljwirah Andrea L. Felicelli Xiulin Ruan Justin A. Weibel |
| author_sort | Orlando G. Rivera González |
| collection | DOAJ |
| description | Abstract Outdoor radiative cooling surfaces passively lose heat by reflecting solar irradiation and emitting infrared radiation to cold deep space through the atmospheric sky window (8–13 µm), thereby achieving sub‐ambient temperature. Ultrawhite radiative cooling paints are an emerging technology offering scalable solutions for cooling and passive water harvesting wherein surface wettability plays a key role. This work, examines how radiative cooling paint pigment and binder formulations affect surface morphology, roughness, and dynamic wettability. Samples are prepared with three different nanoparticulate pigments, calcium carbonate (CaCO3), barium sulfate (BaSO4), and hexagonal boron nitride (hBN); two binders, including an acrylic and a waterborne silicone‐modified polyurethane dispersion (SILIKOPUR 8081); and pigment solid volume concentrations from 0% to 80% v/v. The CaCO3 and BaSO4 pigments produced paints with rougher textures and higher contact angles due to their pigment particle morphology. While high solar reflectance was achieved across various pigment and binder combinations, wettability exhibited a complex trend with pigment concentration, indicating that maximizing reflectance does not necessarily optimize wetting behavior. This expanded understanding on how pigment type, binder and concentration influence wettability, offering pathways to design coatings with tailored spectral and wetting properties for both self‐cleaning paints and passive water harvesting applications |
| format | Article |
| id | doaj-art-848d30e4dcb34be09f1fbb1349f7908b |
| institution | Kabale University |
| issn | 2196-7350 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Advanced Materials Interfaces |
| spelling | doaj-art-848d30e4dcb34be09f1fbb1349f7908b2025-08-25T08:06:18ZengWiley-VCHAdvanced Materials Interfaces2196-73502025-08-011216n/an/a10.1002/admi.202500288Dynamic Wettability Behavior of Emerging Ultrawhite Radiative Cooling PaintsOrlando G. Rivera González0Abdulrahman K. Aljwirah1Andrea L. Felicelli2Xiulin Ruan3Justin A. Weibel4School of Mechanical Engineering and Birck Nanotechnology Center Purdue University West Lafayette IN 47907 USASchool of Mechanical Engineering and Birck Nanotechnology Center Purdue University West Lafayette IN 47907 USASchool of Mechanical Engineering and Birck Nanotechnology Center Purdue University West Lafayette IN 47907 USASchool of Mechanical Engineering and Birck Nanotechnology Center Purdue University West Lafayette IN 47907 USASchool of Mechanical Engineering and Birck Nanotechnology Center Purdue University West Lafayette IN 47907 USAAbstract Outdoor radiative cooling surfaces passively lose heat by reflecting solar irradiation and emitting infrared radiation to cold deep space through the atmospheric sky window (8–13 µm), thereby achieving sub‐ambient temperature. Ultrawhite radiative cooling paints are an emerging technology offering scalable solutions for cooling and passive water harvesting wherein surface wettability plays a key role. This work, examines how radiative cooling paint pigment and binder formulations affect surface morphology, roughness, and dynamic wettability. Samples are prepared with three different nanoparticulate pigments, calcium carbonate (CaCO3), barium sulfate (BaSO4), and hexagonal boron nitride (hBN); two binders, including an acrylic and a waterborne silicone‐modified polyurethane dispersion (SILIKOPUR 8081); and pigment solid volume concentrations from 0% to 80% v/v. The CaCO3 and BaSO4 pigments produced paints with rougher textures and higher contact angles due to their pigment particle morphology. While high solar reflectance was achieved across various pigment and binder combinations, wettability exhibited a complex trend with pigment concentration, indicating that maximizing reflectance does not necessarily optimize wetting behavior. This expanded understanding on how pigment type, binder and concentration influence wettability, offering pathways to design coatings with tailored spectral and wetting properties for both self‐cleaning paints and passive water harvesting applicationshttps://doi.org/10.1002/admi.202500288condensationdynamic wettabilityradiative cooling paintwater harvesting |
| spellingShingle | Orlando G. Rivera González Abdulrahman K. Aljwirah Andrea L. Felicelli Xiulin Ruan Justin A. Weibel Dynamic Wettability Behavior of Emerging Ultrawhite Radiative Cooling Paints Advanced Materials Interfaces condensation dynamic wettability radiative cooling paint water harvesting |
| title | Dynamic Wettability Behavior of Emerging Ultrawhite Radiative Cooling Paints |
| title_full | Dynamic Wettability Behavior of Emerging Ultrawhite Radiative Cooling Paints |
| title_fullStr | Dynamic Wettability Behavior of Emerging Ultrawhite Radiative Cooling Paints |
| title_full_unstemmed | Dynamic Wettability Behavior of Emerging Ultrawhite Radiative Cooling Paints |
| title_short | Dynamic Wettability Behavior of Emerging Ultrawhite Radiative Cooling Paints |
| title_sort | dynamic wettability behavior of emerging ultrawhite radiative cooling paints |
| topic | condensation dynamic wettability radiative cooling paint water harvesting |
| url | https://doi.org/10.1002/admi.202500288 |
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