Polymer composites with hierarchical architecture and dielectric particles for efficient daytime subambient radiative cooling

Abstract

Passive daytime radiative cooling (PDRC) is an emerging energy-free cooling technology, which can weaken our dependence on air-conditioning requirements with energy-consuming. Though the advance in photonic micro/nanostructures PDRC materials achieves...

Strain-Insensitive Outdoor Wearable Electronics by Thermally Robust Nanofibrous Radiative Cooler

“…Conventional approaches to prepare the radiative cooling materials usually depend on combinations of multiple materials or, when utilizing a single material, complicated techniques such as phase inversion or sacrificial templates . In contrast, electrospinning technology stands out for its inherent advantages, enabling precise control over process parameters and a straightforward procedure. , Especially, for the fabrication of stretchable membranes, electrospinning techniques usually employ thermoplastic polymers such as PU and SBS to prepare the nanofiber structure through a single nozzle.…”

“…Conventional approaches to prepare the radiative cooling materials usually depend on combinations of multiple materials 27 or, when utilizing a single material, complicated techniques such as phase inversion 28 or sacrificial templates. 29 In contrast, electrospinning technology stands out for its inherent advantages, enabling precise control over process parameters and a straightforward procedure.…”

A flame-retardant wood-based composite with magnesium–aluminium layered double hydroxides for efficient daytime radiative cooling

“…PDRC surfaces reect sunlight and dissipate heat to outer space by emitting electromagnetic waves through an atmospheric transparent window (8-13 mm), which require zero energy input, 4,5 and hence have signicant potential for energyefficient buildings, 6,7 photovoltaic cooling, 8 and personal thermal management. [9][10][11] A range of materials have been proposed for PDRC applications, including polymer lms, [12][13][14][15] nano-coating materials, [16][17][18][19] and photonic structural materials. 20,21 For instance, Mandal et al introduced a phase inversion-based method for fabricating hierarchically porous poly(vinylidene uoride-co-hexauoropropene) [P(VdF-HFP) HP ] coatings with excellent PDRC capability; 22 Bao et al demonstrated a highly scalable nanoparticle-based double-layer coating (a top reective layer with high solar albedo and a bottom emissive layer of TiO 2 , SiO 2 , and SiC nanoparticles) to achieve efficient terrestrial radiative cooling.…”

Porous Structure of Polymer Films Optimized by Rationally Tuning Phase Separation for Passive All-Day Radiative Cooling

“…Ideal passive all-day radiative cooling (PARC) films require specific materials with high emissivity in the atmospheric window (8–13 μm), such as metal oxides, semiconductors, − and polymers, − as well as designing of precise structures to achieve a high reflectivity in the solar spectrum range (0.3–2.5 μm), minimizing the absorption of solar energy. − Compared with dielectric-based photonic structural materials, , fiber membranes, , and other composite materials, − hierarchical pores that enable Mie scattering can scatter solar light; such pores can be easily manufactured and are cost-effective and scalable. , Effective scattering of the entire solar spectrum can be achieved by rationally adjusting the size and distribution of these pores . Recent studies have demonstrated that the nonsolvent-induced phase separation (NIPS) method is effective for fabricating porous structures in polymer films, such as polyvinylidene fluoride–hexafluoropropylene (PVDF–HFP), − polydimethylsiloxane, , cellulose acetate (CA), , and polylactic acid (PLA) films for PARC. For instance, Mandal et al developed a cost-effective and scalable porous radiative cooler by utilizing PVDF–HFP, acetone (ACE), and water as raw materials.…”