Emerging colored and transparent radiative cooling: Fundamentals, progress, and challenges

Materials Today, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Language: Английский

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Optical wood with switchable solar transmittance for all-round thermal management

Composites Part B Engineering, Journal Year: 2024, Volume and Issue: 275, P. 111287 - 111287

Published: Feb. 11, 2024

Language: Английский

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Self-sustained and Insulated Radiative/Evaporative Cooler for Daytime Subambient Passive Cooling

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(5), P. 6513 - 6522

Published: Jan. 26, 2024

Passive cooling technologies are one of the promising solutions to global energy crisis due no consumption fossil fuels during operation. However, existing radiative and evaporative coolers still have problems achieving daytime subambient while maintaining evaporation over long term. Here, we propose a self-sustained insulated radiative/evaporative cooler (SIREC), which consists porous polyethylene film (P-PE) at top, an air layer in middle, poly(vinyl alcohol) hydrogel with lithium bromide (PLH) bottom. In particular, P-PE shows high solar reflectance (R̅solar = 0.91) long-wave infrared transmittance (τ̅LWIR 0.92), reflects sunlight enhancing direct heat transfer between outer space PLH (ε̅LWIR 0.96) for sky cooling. addition, desirable vapor permeability (579 s m–1) also results good compatibility (EC). Moreover, PLH's ability harvest atmospheric water night provides self-sustainment EC. The further enhances performance SIREC. These findings indicate prospects integration passive technologies.

Language: Английский

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Radiative Cooling Nanohybrids with Room-Temperature Switching

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 12, 2025

Recent advancements in radiative cooling technologies have highlighted their potential as sustainable and environmentally friendly solutions. However, while this method offers significant energy savings during hot seasons, it may incur losses (overcooling leads to a waste of energy) colder conditions. The current solution has the problems complex process or easy leakage materials. To address challenge, we synthesized SiO2 nanohybrid (a nanoparticle with elongated polymer chains grafted onto its surface), which modifies thermoresponsive behavior composites. Upon incorporation these nanohybrids into matrix, will display morphological changes response temperature variations, leading emissivity resulting composite film. What's more, reflectivity film was enhanced from 57.26 89.37%, increasing performance by 4 °C weather. Results confirmed that maintained structural integrity without leakage, demonstrating robust durability. Overall, work offer valuable insights for advancing applications.

Language: Английский

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Radiative Cooling Potential of a Water-Based Paint Formulation under Realistic Application Conditions

ACS Applied Optical Materials, Journal Year: 2024, Volume and Issue: unknown

Published: April 24, 2024

Passive radiative cooling (PRC) technology holds promise to offset a significant fraction of our energy needs and carbon footprint associated with cooling. Among different approaches, paint-like systems present several advantages in terms cost effectiveness, scalability, application ease. However, most the recent paint formulations capable daytime PRC rely on use organic solvents which increase their cost, environmental impact, safety hazards. Lightweight, water-based are particularly desirable suppress emission volatile compounds (VOCs) altogether expand applicability. We report simple mixture, solar reflectance 90% thermal emissivity 95%, comprising mixture glass bubbles PVDF-HFP used directly its powder form. The is tested under conditions relevant for building sector without sealing it from convection. Depending choice ambient temperature reference, material this degree found exert either vanishing power or up 100 W m–2, highlighting importance rigorous testing explaining large performance variations literature materials similar spectral properties.

Language: Английский

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A switchable dual-mode film with designed intercalated and hierarchical structures for highly efficient passive radiation cooling and solar heating

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 494, P. 152920 - 152920

Published: June 7, 2024

Language: Английский

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All-in-One Cast-Molded Hydrophobic Silicon Dioxide-Phase Change Microcapsule/Gelatin-Hydroxyethyl Cellulose Composite Aerogel for Building Cooling

ACS Sustainable Chemistry & Engineering, Journal Year: 2024, Volume and Issue: 12(28), P. 10423 - 10435

Published: July 3, 2024

Language: Английский

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Harnessing optimized SiO₂ particles for enhanced passive daytime radiative cooling in thin composite coatings

Solar Energy Materials and Solar Cells, Journal Year: 2024, Volume and Issue: 278, P. 113146 - 113146

Published: Sept. 7, 2024

Language: Английский

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Electrochromic thermal metadevices for dynamic switching between broadband and selective thermal emission towards efficient radiative cooling of vertical surfaces

International Journal of Heat and Mass Transfer, Journal Year: 2025, Volume and Issue: 243, P. 126887 - 126887

Published: March 3, 2025

Language: Английский

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Low-hysteresis, high-fidelity flexible strain sensor with interconnected conductive network design for harsh environments and manipulator control

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 162258 - 162258

Published: April 1, 2025

Language: Английский

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