Passive daytime radiative cooling inorganic-polymeric composite artificial lawn for the alternative to the natural lawn

Yang, Zhangbin; Jiang, Tiankai; Zhang, Jun

doi:10.1016/j.solmat.2020.110783

Cited by 29 publications

(8 citation statements)

References 29 publications

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“…Herein, we report an architectural design and fabrication of the three-phase self-assembled hybrid porous composite coatings possessing an appropriate amount of silica microspheres embedded within hierarchical porous heterostructures, enabling additionally created microsphere/air interfaces to dramatically enhance Mie scattering and flexible daytime radiative cooling. It is also mentioned that this three-phase porous composite approach is somehow different from the previous two-phase porous or nonporous composite strategies for increasing solar reflectivity. ,,,− In general, the phase inversion fabrication method results in two-phase porous composite coatings, while direct solution cast methods produce the two-phase nonporous composites. Here, the modified phase inversion fabrication method is introduced to the formation of three-phase porous composite coatings by controlling the mass fractions of silica microspheres.…”

Section: Introductionmentioning

confidence: 99%

Flexible Daytime Radiative Cooling Enhanced by Enabling Three-Phase Composites with Scattering Interfaces between Silica Microspheres and Hierarchical Porous Coatings

Wang

Dou

et al. 2021

ACS Appl. Mater. Interfaces

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Daytime radiative cooling has attracted considerable attention recently due to its tremendous potential for passively exploiting the coldness of deep-sky as clean and renewable energy. Many advanced materials with novel photonic micro-nanostructures have already been developed to enable highly efficient daytime radiative coolers, among which the flexible hierarchical porous coatings (HPCs) are a more distinguished category. However, it is still hard to precisely control the size distribution of the randomized pores within the HPCs, usually resulting in a deficient solar reflection at the near-infrared optical regime under diverse fabrication conditions of the coatings.We report here a three-phase (i.e., air pore-phase, microsphere-phase and polymerphase) self-assembled hybrid porous composite coating which dramatically increases the average solar reflectance and yields a remarkable temperature drop of ~10℃ and ~30℃ compared to the ambient circumstance and black paint, respectively, according to the rooftop measurements. Mie theory and Monte Carlo simulations reveal the origin of the low reflectivity of as-prepared two-phase porous HPCs, and the optical cooling improvement of the three-phase porous composite coatings is attributed to the newly generated interfaces possessing the high scattering efficiency between the hierarchical pores and silica microspheres hybridized with appropriate mass fractions. As a result, the hybrid porous composite approach enhances the whole performance of the coatings, which provides a promising alternative to the flexible daytime radiative cooler.

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Section: Introductionmentioning

confidence: 99%

Flexible Daytime Radiative Cooling Enhanced by Enabling Three-Phase Composites with Scattering Interfaces between Silica Microspheres and Hierarchical Porous Coatings

Wang

Dou

et al. 2021

ACS Appl. Mater. Interfaces

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“…The low power density of this technology has compromised their superiority in clean cooling and placed great restrictions on the prospects of this technology. [90,[111][112][113][114] On the other hand, evaporative cooling has been widely used in air conditioning systems and personal cooling management due to its efficient heat exchange. Except for the commonly used refrigerants, water has been used as the cooling medium due to its high latent heat.…”

Section: Hydrogel Materialsmentioning

confidence: 99%

Micro‐Nano Porous Structure for Efficient Daytime Radiative Sky Cooling

Liu

Tang

Jiang

et al. 2022

Adv Funct Materials

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CO 2 in 2050. [5] Due to the second law of thermodynamics, cooling is generally more challenging than heating. Conventional vapor-compression cooling not only results in excessive energy consumption, accelerating the depletion of fossil fuels, but also degrades the atmospheric ozone, leading to notorious environmental issues. Therefore, developing novel and pollutionfree cooling technology has become an urgent demand in the following decades.Radiative sky cooling (RSC) can harvest the coldness of the universe via the 8-13 µm atmospheric window without any pollution and energy consumption, which has witnessed great progress in the last few years. [6][7][8] Since the first demonstration of daytime radiative cooling via multilayer photonic structure by Fan and co-workers in 2014, this facile cooling technology has drawn worldwide attention. [9,10] With the joint efforts, RSC technology has achieved striking advances in building cooling, [4,11] photovoltaic cooling, [12][13][14] cryogenic cooling, [15,16] RSC driving thermoelectricity, [17][18][19] atmospheric water harvesting, [20,21] personal thermal management [3,22,23] and wearable devices. [24][25][26] For building cooling, the pioneering reports by Goldstein et al. and Zhao et al. have demonstrated that building-integrated RSC modules can provide continuous day-and-night cooling and can potentially save 32%-45% of the electricity consumption for cooling in summer. [4,11] For photovoltaic cooling, selective photonic cooler can lower the temperature of solar panels by over 5.7 K and afford the greater cooling

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“…Radiative cooling is a passive and natural phenomenon with zero energy consumption. It does not require additional energy or resources and involves emitting thermal radiation from the earth to the outer space through the atmospheric transparent window (8–13 μm) and simultaneously rejecting solar heating by reflecting sunlight, − which can help relieve the global energy crisis and environmental pressures. As the cooling temperature can be lower than the ambient temperature even under the maximal solar intensity, tens of designs and structures of passive daytime radiative cooling composites have been intensively investigated and demonstrated to exhibit a sub-ambient temperature drop in recent years. − In 2014, Fan et al achieved a breakthrough in the radiative cooling technology with the complex membrane structure of multilayer SiO 2 and HfO 2 with different thicknesses.…”

Section: Introductionmentioning

confidence: 99%

“…The membrane structure improved the reflectance of the material and the midday temperature was reduced by 4.9 °C, though the preparation process was complex and the cooling efficiency was very limited. Furthermore, great progresses have been made through designing complex multilayer structures − and photonic crystals − and doping with organic and inorganic components, such as chromium oxide (Cr 2 O 3 ), silicon dioxide (SiO 2 ), magnesium hydrogen phosphate (MgHPO 4 ), zirconia (ZrO 2 ), and alumina (Al 2 O 3 ), − while the high cost limited large-scale application. Gentle and Smith have done great work in radiative cooling through paints since the 1990s and silver under-layers from 2015. − In 2017, the Yang group completed a pioneering work in the application of radiative cooling technology using a metamaterial created from resonance polar dielectric microbeads (SiO 2 ) embedded in the organic polymer polymethylpentene (TPX) and realized the large-scale roll-to-roll manufacturing .…”

Section: Introductionmentioning

confidence: 99%

Ordered-Porous-Array Polymethyl Methacrylate Films for Radiative Cooling

Tan

et al. 2022

ACS Appl. Mater. Interfaces

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Passive radiative cooling is a spontaneous pattern of reflecting sunlight and radiating heat into the cold outer space through transparent atmosphere windows. In this work, an ordered-porous-array polymethyl methacrylate (OPA-PMMA) film with the properties of excellent radiative cooling is designed and studied. An ultra-high emissivity of 98.4% in the mid-infrared region (3–25 μm) and a good solar reflectance of 85% in the ultraviolet and near-infrared solar spectra (0.2–2.5 μm) were achieved. The surface temperature of the OPA-PMMA film is 16 °C lower than that of the smooth-surface PMMA films and is 8.6 °C lower than that of the commercial white paint in the outdoor test. The structure of the OPA plays an important role in improving solar reflectivity and emissivity. The films are fabricated using a one-step low-cost process that can be applied for large-scale production. It is vital for promoting radiative cooling as a viable energy technology for buildings, fabric, or equipment that need a cooling environment.

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Passive daytime radiative cooling inorganic-polymeric composite artificial lawn for the alternative to the natural lawn

Cited by 29 publications

References 29 publications

Flexible Daytime Radiative Cooling Enhanced by Enabling Three-Phase Composites with Scattering Interfaces between Silica Microspheres and Hierarchical Porous Coatings

Flexible Daytime Radiative Cooling Enhanced by Enabling Three-Phase Composites with Scattering Interfaces between Silica Microspheres and Hierarchical Porous Coatings

Micro‐Nano Porous Structure for Efficient Daytime Radiative Sky Cooling

Ordered-Porous-Array Polymethyl Methacrylate Films for Radiative Cooling

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