Daytime
radiative coolers are used to pump excess heat from a target object
into a cold exterior space without energy consumption. Radiative coolers
have become attractive cooling options. In this study, a daytime radiative
cooler was designed to have a selective emissive property of electromagnetic
waves in the atmospheric transparency window of 8–13 μm
and preserve low solar absorption for enhancing radiative cooling
performance. The proposed daytime radiative cooler has a simple multilayer
structure of inorganic materials, namely, Al2O3, Si3N4, and SiO2, and exhibits
high emission in the 8–13 μm region. Through a particle
swarm optimization method, which is based on an evolutionary algorithm,
the stacking sequence and thickness of each layer were optimized to
maximize emissions in the 8–13 μm region and minimize
the cooling temperature. The average value of emissivity of the fabricated
inorganic radiative cooler in the 8–13 μm range was 87%,
and its average absorptivity in the solar spectral region (0.3–2.5
μm) was 5.2%. The fabricated inorganic radiative cooler was
experimentally applied for daytime radiative cooling. The inorganic
radiative cooler can reduce the temperature by up to 8.2 °C compared
to the inner ambient temperature during the daytime under direct sunlight.
Ag-nanomesh-based highly bendable conducting electrodes are developed using a combination of metal nanotransfer printing and embossing for the 6-inch wafer scale. Two Ag nanomeshes, including pitch sizes of 7.5 and 10 μm, are used to obtain highly transparent (approximately 85% transmittance at a wavelength of 550 nm) and electrically conducting properties (below 10 Ω sq(-1)). The Ag nanomeshes are also distinguished according to the fabrication process, which is called transferred or embedded Ag nanomesh on polyethylene terephthalate (PET) substrate, in order to compare their stability against bending stress. Then the enhancement of bending stability when the Ag nanomesh is embedded in the PET substrate is confirmed.
ZnO-based hierarchical structures including nanoparticles (NPs), nanorods (NRs), and nanoflowers (NFs) on 3D-printed backbones were effectively fabricated via the combination of FDM 3D-printing technique and hydrothermal reaction.
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