![]() Herein, we report a hierarchically structured polymethyl methacrylate (PMMA) film with a micropore array combined with random nanopores for highly efficient day- and nighttime passive radiative cooling. While some progress has been made, it still remains big challenge in fabricating highly efficient and low-cost radiative coolers for all-day and all-climates. ![]() The metamaterials deployed in solar cells and windows can effectively suppress the rise in temperature under solar irradiation, thereby mitigating the performance degradation of solar cells by heating issues and suppressing the rise in temperature of indoor air.Īll-day passive radiative cooling has recently attracted tremendous interest by reflecting sunlight and radiating heat to the ultracold outer space. A visibly clear and flexible radiative cooling metamaterial is demonstrated using optical modulator‐infiltrated silica aerogel microparticles in a silicone elastomer. The visibly clear metamaterials deployed in solar cells and windows can effectively suppress the rise in temperature under solar irradiation, thereby mitigating the performance degradation of solar cells by heating issues and suppressing the rise in temperature of indoor air. The significant suppression of the rise in temperature by the metamaterial is verified using both indoor and outdoor experiments. The optical modulator effectively suppresses visible light scattering, thus enabling higher loading of silica aerogel microparticles while securing visible clarity. In this study, visibly clear and flexible radiative cooling metamaterials have been developed using a newly designed optical modulator filled into randomly distributed silica aerogel microparticles in a silicone elastomer. Ubiquitous applications necessitate the development of metamaterials with high mechanical flexibility in a scalable manner while overcoming translucence. Its applications include solar cells and building and automobile windows that are prone to heating issues. The study of transparent daytime radiative cooling with no additional energy consumption is a promising area of research. SiO 2 NPs showed high potential for in vivo applications as multiplex nanoprobes with high SERS sensitivity in the NIR region. SiO 2 500 NPs with 14 different Raman label compounds exhibited distinct SERS signals upon subcutaneous injection into nude mice. SiO 2 500 nanoprobes showed detectable in vivo SERS signals at a concentration of 16 μg/mL in animal tissue specimen at a depth of 7 mm. SiO 2 500 NPs with a 0.98-nm gap showed a high SERS enhancement factor of approximately 3.8 × 10 ⁶ under 785-nm photoexcitation. ![]() The nanogaps between Au NPs on the SiO 2 surface could be controlled from 4.16 to 0.98 nm by adjusting the concentration of Au precursor (hence increasing Au NP sizes), which resulted in the formation of effective SERS hotspots. SiO 2 NPs using six different sizes of Au NPs (SiO 2 50 –SiO 2 500 ) were prepared by controlling the concentration of Au precursor in the growth step. Gold (Au)-assembled nanostructures with controllable nanogaps with highly enhanced SERS signals within multiple hotspots could be a breakthrough.Īu-assembled silica (SiO 2 ) nanoparticles (NPs) (SiO 2 NPs) as NIR SERS nanoprobes are synthesized using the seed-mediated growth method. ![]() A well-controlled morphology and biocompatibility are essential features of NIR SERS nanoprobes. To take advantages, such as multiplex capacity, non-photobleaching property, and high sensitivity, of surface-enhanced Raman scattering (SERS)-based in vivo imaging, development of highly enhanced SERS nanoprobes in near-infrared (NIR) region is needed. Daytime temperature experiments confirm that the cooling window efficiently lowers the interior temperature by as much as 7 ☌. This study theoretically and experimentally demonstrates a transparent radiative cooling window using a combination of planar hyperbolic metamaterials and a uniform layer of polydimethylsiloxane, resulting in high visible transparency (>60%), IR reflectivity (>89%), and thermal emissivity (>95%). Although solar energy management and radiative cooling techniques have been investigated individually, the combination of the two, a transparent radiative cooler, has emerged only recently. It should also efficiently radiate thermal energy to prevent excessive heating. ![]() The coatings should block the solar IR energy (800–2500 nm) while maintaining visible light transparency (400–700 nm) to prevent unwanted heating of the interior of a building or a vehicle. Passive multilayer coatings for windows have potential to improve energy consumption for indoor temperature regulation. ![]()
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