Flexible Transparent Heat Mirror for Thermal Applications

Li, Shimin; Xu, Qianqian; Zhou, Ziji; Zhao, Wenchao; Li, Xiaowen; Wen, Zhengji; Yao, Yao; Xu, Hao; Deng, Huiyong; Dai, Ning; Hao, Jiaming

doi:10.3390/nano10122479

Cited by 5 publications

(5 citation statements)

References 38 publications

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“…Our model is applicable for the description of the optical behavior of PMMs even under critical conditions, and works well for both TE and TM polarized waves. We believe that our NEMT will greatly enrich the spatial-dispersion explanation of the PMM system and provide guidelines for the comprehensive analysis of PMMs for photonic device applications [27][28][29].…”

Section: Introductionmentioning

confidence: 96%

Nonlocal effective-medium theory for periodic multilayered metamaterials

Wen

Zhao

et al. 2021

J. Opt.

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Spatial-dispersion (nonlocal) effects are non-negligible in periodic multilayered metamaterials under certain specific conditions, which cannot be completely understood based on the local effective-medium theory, even though the metamaterials are constructed by deep subwavelength meta-atoms. Here, we present a simple yet robust effective-medium model for such media in which the nonlocal effects are properly considered. Our proposed nonlocal model is established by the analysis of the dispersion relation of the effective medium without any expansion-based approximation, which is applicable for description of the optical behavior of the multilayered metamaterials even under critical conditions, and works well for both TE and TM polarized waves. We believe our model will be a powerful tool for the investigation of electromagnetic nonlocality in the realm of metamaterials and subwavelength optics.

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Section: Introductionmentioning

confidence: 96%

Nonlocal effective-medium theory for periodic multilayered metamaterials

Wen

Zhao

et al. 2021

J. Opt.

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“…[4] The energy used for heating and cooling buildings constitutes up to 48% of the total energy DOI: 10.1002/advs.202308200 consumption in buildings, making it a substantial portion of energy expenditure. [5][6][7] Moreover, air conditioning and combustion heating contribute to various environmental issues, including atmospheric pollution and the greenhouse effect. [8][9][10] Utilizing renewable and clean energy sources for heating and cooling, as well as exploring the conversion of heat and cold into other usable energy sources has drawn extensive attention from diverse fields for mitigating excessive energy consumption and the associated environmental problems.…”

Section: Introductionmentioning

confidence: 99%

A Polymer Nanocomposite with Strong Full‐Spectrum Solar Absorption and Infrared Emission for All‐Day Thermal Energy Management and Conversion

Li,

Zhang,

Zhang

et al. 2024

Advanced Science

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Realizing efficient energy utilization from the heat source of the sun and the cold source of outer space is of great significance for addressing the global energy and environmental crisis. Materials with ideal full‐spectrum solar absorption and infrared emission are highly desirable for adapting to the continuous weather dynamic throughout the day, nonetheless, their development remains challenging. Here, a polymer nanocomposite with full‐spectrum strong solar (280–2500 nm) absorption ranging from 88.8% to 94.8% with an average value of 93.2% and full‐spectrum high infrared (8–13 µm) emission ranging from 81.3% to 90.0% with an average value of 84.2%, is reported by melt‐processing polypropylene and uniformly dispersed low‐loading MXene nanosheets (1.9 vol%). The nanocomposite can achieve daytime photothermal enhancement of ≈50 °C and nighttime radiative cooling of 8 °C. The temperature difference throughout the day ensures all‐day uninterrupted thermoelectric generation, yielding a power density output of 1.5 W m−2 (daytime) and 7.9 mW m−2 (nighttime) in real outdoor environment without any additional energy consumption. This work provides an impressive polymer nanocomposite with ideal full‐spectrum solar absorption and infrared emission for all‐day uninterrupted thermal energy management and conversion.

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“…A large amount of energy, which is consumed while lightening a room, is lost through windows. These energy losses could be prevented by improving the thermal performance of windows, thus reducing energy consumption, electricity costs, and emission of greenhouse gases [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, Transparent Heat Mirrors (THM) possess the aforementioned properties. Nanostructured multi-layered THM of suitable composition allow for the transmittance of VIS (λ = 400-700 nm) and reflect IR (λ = 700-3000 nm) from the incident sun rays, providing large energy savings [8]. Due to their high refractive index, the transmission of VIS, reflection of IR, and suitable optical band gap (E BG ), HfO 2 (E BG ~5.3-5.7 eV) and V 2 O 5 (E BG ~1.7-2.3 eV) are promising for the application of THM [9].…”

Section: Introductionmentioning

confidence: 99%

Intrinsic Properties and Future Perspective of HfO2/V2O5/HfO2 Multi-Layer Thin Films via E-Beam Evaporation as a Transparent Heat Mirror

et al. 2022

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HfO2 and V2O5 as multi-layer thin films are discussed for their potential use as transparent heat mirrors. Multi-layered HfO2/V2O5/HfO2 thin films with a thickness of 100/60/100 nm were prepared via e-beam evaporation on a soda–lime glass substrate. Rutherford backscattering confirmed the multi-layer structure with uniform surface. The as-deposited thin films were annealed at 300 °C and 400 °C, respectively, for 1 h in air. The transmittance of approximately 90% was obtained for all thin films. Due to the relatively low thickness and non-stoichiometry of HfO2, a band gap of approximately 3.25 eV was determined (instead of the theoretical 5.3–5.7 eV). The as-deposited thin films possessed conductivity of approximately 0.2 Ω−1cm−1 and increased to 1 Ω−1cm−1 and 2 Ω−1cm−1 for thin films annealed at 300 and 400 °C, respectively. Due to the unique intrinsic properties of HfO2/V2O5/HfO2 thin films, the results obtained are promising for application as a transparent heat mirror.

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Flexible Transparent Heat Mirror for Thermal Applications

Cited by 5 publications

References 38 publications

Nonlocal effective-medium theory for periodic multilayered metamaterials

Nonlocal effective-medium theory for periodic multilayered metamaterials

A Polymer Nanocomposite with Strong Full‐Spectrum Solar Absorption and Infrared Emission for All‐Day Thermal Energy Management and Conversion

Intrinsic Properties and Future Perspective of HfO2/V2O5/HfO2 Multi-Layer Thin Films via E-Beam Evaporation as a Transparent Heat Mirror

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