Flexible Daytime Radiative Cooling Enhanced by Enabling Three-Phase Composites with Scattering Interfaces between Silica Microspheres and Hierarchical Porous Coatings
نویسندگان
چکیده
Daytime radiative cooling has attracted considerable attention recently due to its tremendous potential for passively exploiting the coldness of universe as clean and renewable energy. Many advanced materials with novel photonic micro/nanostructures have already been developed enable highly efficient daytime coolers, among which flexible hierarchical porous coatings (HPCs) are a more distinguished category. However, it is still hard precisely control size distribution randomized pores within HPCs, usually resulting in deficient solar reflection at near-infrared optical regime under diverse fabrication conditions coatings. We report here three-phase (i.e., air pore-phase, microsphere-phase, polymer-phase) self-assembled hybrid composite coating, dramatically increases average reflectance yields remarkable temperature drops ∼10 ∼ 30 °C compared ambient circumstance black paint, respectively, according rooftop measurements. Mie theory Monte Carlo simulations reveal origin low reflectivity as-prepared two-phase improvement attributed newly generated interfaces possessing high scattering efficiency between silica microspheres hybridized appropriate mass fractions. As result, approach enhances whole performance coatings, provides promising alternative cooler.
منابع مشابه
Enhanced resonator sensitivity with nanostructured porous silica coatings.
We present a strategy to increase the sensitivity of resonators to the presence of specific molecules in the gas phase, measured by the change in resonant frequency as the partial pressure of the molecule changes. We used quartz crystals as the resonators and coated them with three different thin films (<1 microm thick) of porous silica: silica xerogel, silica templated by an ordered hexagonal ...
متن کاملAdditive-free synthesis of 3D porous V2O5 hierarchical microspheres with enhanced lithium storage properties
A facile synthesis of novel 3D porous V2O5 hierarchical microspheres has been developed, based on an additive-free solvothermal method and subsequent calcination. Due to their unique structure, these V2O5 microspheres display a very stable capacity retention of 130 mA h g (1) over 100 cycles at a current rate of 0.5 C, and show excellent rate capability with a capacity of 105 mA h g (1) even at...
متن کاملUltrabroadband photonic structures to achieve high-performance daytime radiative cooling.
If properly designed, terrestrial structures can passively cool themselves through radiative emission of heat to outer space. For the first time, we present a metal-dielectric photonic structure capable of radiative cooling in daytime outdoor conditions. The structure behaves as a broadband mirror for solar light, while simultaneously emitting strongly in the mid-IR within the atmospheric trans...
متن کاملDual templating synthesis of hierarchical porous silica materials with three orders of length scale.
Three-dimensionally interconnected, highly porous silica materials with ordering on three different scales, that is, macropores (10-30 μm), interconnecting windows (3-5 μm), and nanoporous walls (∼80 nm), are prepared via a dual-templating approach.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: ACS Applied Materials & Interfaces
سال: 2021
ISSN: ['1944-8244', '1944-8252']
DOI: https://doi.org/10.1021/acsami.1c02145