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Zhou W, Ma X, Liu M, Niu J, Wang S, Li S, Wang W, Fan Y. Superhydrophobic Composite Coatings Can Achieve Durability and Efficient Radiative Cooling of Energy-Saving Buildings. ACS APPLIED MATERIALS & INTERFACES 2024; 16:46703-46718. [PMID: 39177497 DOI: 10.1021/acsami.4c06827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/24/2024]
Abstract
Passive daytime radiative cooling (PDRC) technology has received a great deal of attention in the field of energy efficiency and environmental protection as a sustainable technology and a large-scale and promising solution to mitigate the environmental impact of global warming. In this study, we prepared PDRC material by combining FEP with modified Al2O3 particles and using the method of spray combined with phase separation. The synergistic effect of the formed surface micronanostructures, combined with the molecular vibration of FEP and the phonon polarization resonance of Al2O3, further improves the optical performance of the PDRC coating. The PDRC coating has an average reflectivity of 0.96 in the solar spectral band (0.3-2.5 μm) and an average emissivity of 0.963 in the atmospheric window band ((8-13 μm). In addition, the PDRC coating had good hydrophobicity, and its water contact angle (WAC) reached 159.3°. Under direct sunlight conditions, PDRC materials have a good temperature drop (4.9 °C) compared to ambient temperatures and radiative cooling power (81.2 W/m2). The prepared coating maintains superhydrophobicity and excellent cooling performance when soaked in solutions of different pH values and UV radiation, which was of great significance for sustainable applications. Our work provides a form of long-term cooling that can be effectively implemented in green and energy-efficient buildings.
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Affiliation(s)
- Wenlong Zhou
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Xiaohan Ma
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Mai Liu
- School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
| | - Jun Niu
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
- Key Laboratory for New Type of Functional Materials in Hebei Province, Tianjin 300130, China
| | - Shengxing Wang
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
- Key Laboratory for New Type of Functional Materials in Hebei Province, Tianjin 300130, China
| | - Shijie Li
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
- Key Laboratory for New Type of Functional Materials in Hebei Province, Tianjin 300130, China
| | - Wei Wang
- State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China
| | - Yongzhe Fan
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
- Key Laboratory for New Type of Functional Materials in Hebei Province, Tianjin 300130, China
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Pal SK, Jeong S, Otoufat T, Bae H, Kim G. Adaptive cooling strategy via human hair: High optothermal conversion efficiency of solar radiation into thermal dissipation. Proc Natl Acad Sci U S A 2024; 121:e2312297121. [PMID: 38236734 PMCID: PMC10823228 DOI: 10.1073/pnas.2312297121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 12/12/2023] [Indexed: 01/23/2024] Open
Abstract
Natural species have developed complex nanostructures in a hierarchical pattern to control the absorption, reflection, or transmission of desired solar and infrared wavelengths. This bio-inspired structure is a promising method to manipulating solar energy and thermal management. In particular, human hair is used in this article to highlight the optothermal properties of bio-inspired structures. This study investigated how melanin, an effective solar absorber, and the structural morphology of aligned domains of keratin polymer chains, leading to a significant increase in solar path length, which effectively scatter and absorb solar radiation across the hair structure, as well as enhance thermal ramifications from solar absorption by fitting its radiative wavelength to atmospheric transmittance for high-yield radiative cooling with realistic human body thermal emission.
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Affiliation(s)
- Sudip Kumar Pal
- Biomedical Manufacturing Technology Center, Korea Institute of Industrial Technology, Yeongcheon38822, Republic of Korea
| | - Soohyun Jeong
- Biomedical Manufacturing Technology Center, Korea Institute of Industrial Technology, Yeongcheon38822, Republic of Korea
| | - Tohid Otoufat
- Biomedical Manufacturing Technology Center, Korea Institute of Industrial Technology, Yeongcheon38822, Republic of Korea
| | - Hoyeon Bae
- Biomedical Manufacturing Technology Center, Korea Institute of Industrial Technology, Yeongcheon38822, Republic of Korea
| | - Gunwoo Kim
- Biomedical Manufacturing Technology Center, Korea Institute of Industrial Technology, Yeongcheon38822, Republic of Korea
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Pisharody GR, Sahoo P, Shankar Rao DS, Ramakrishna Matte HSS, Sikdar D, Krishna Prasad S. IR regulation through preferential placement of h-BN nanosheets in a polymer network liquid crystal. MATERIALS HORIZONS 2024; 11:554-565. [PMID: 37982355 DOI: 10.1039/d3mh01467c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2023]
Abstract
Recently, there has been a great deal of interest in devices which effectively shield near-infrared light with an additional feature of external field tunability, particularly for energy-saving applications. This article demonstrates an approach for fabricating a highly efficient near-infrared regulating device based on a polymer network liquid crystal reinforced with nanosheets of hexagonal-boron nitride (BN). The device achieves ∼84% IR scattering capability over a wavelength range of 800-2300 nm, and can also be regulated by an electric field. Interestingly, the observed high IR regulation is despite individual components of the composite being IR transparent, in stark contrast to earlier attempted incorporation of IR-absorbing/scattering particles. Detailed experimental characterization methods including FESEM corroborated with EDS and Raman spectroscopy suggest that the preferential positioning of the BN nanosheets, a consequence of the photo-polymerization process, is responsible for the observed feature. The IR reflectivity/back scattering that is doubled upon incorporation of the nanosheets results in an enhanced convective/radiative heat barrier capability, as evidenced by thermal imaging and significant (2 °C) reduction in ambient temperature upon one-Sun illumination. Numerical simulation results are also found to be in good agreement with the observed enhanced reflectance values for the BN-incorporated case. The presence of BN augments the mechanical rigidity of the system by a factor of 6.8 without compromising on the device operating voltage. The protocol employed is quite general and thus advantageous with far-reaching applications in passive cooling of buildings and structures, in thermal camouflaging, and in overall energy management.
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Affiliation(s)
- Gayathri R Pisharody
- Centre for Nano and Soft Matter Sciences, Arkavathi, Survey No. 7, Shivanapura, Dasanapura Hobli, Bengaluru 562162, India.
- Manipal Academy of Higher Education (MAHE), Manipal, 576104, India
| | - Priyabrata Sahoo
- Centre for Nano and Soft Matter Sciences, Arkavathi, Survey No. 7, Shivanapura, Dasanapura Hobli, Bengaluru 562162, India.
- Manipal Academy of Higher Education (MAHE), Manipal, 576104, India
| | - D S Shankar Rao
- Centre for Nano and Soft Matter Sciences, Arkavathi, Survey No. 7, Shivanapura, Dasanapura Hobli, Bengaluru 562162, India.
| | - H S S Ramakrishna Matte
- Centre for Nano and Soft Matter Sciences, Arkavathi, Survey No. 7, Shivanapura, Dasanapura Hobli, Bengaluru 562162, India.
| | - Debabrata Sikdar
- Department of Electronics and Electrical Engineering, Indian Institute of Technology Guwahati, Assam, 781039, India
| | - S Krishna Prasad
- Centre for Nano and Soft Matter Sciences, Arkavathi, Survey No. 7, Shivanapura, Dasanapura Hobli, Bengaluru 562162, India.
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Xie F, Wang T, Li Y, Pan Y, Guo P, Liu C, Shen C, Liu X. Ag Nanoparticles-Coated Shish-Kebab Superstructure Film for Wearable Heater. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 38040021 DOI: 10.1021/acsami.3c14848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2023]
Abstract
Passive and active wearable heaters have received widespread attention due to their efficient utilization of solar energy and all-weather heating capabilities, but the current challenges are their preparation processes being time-consuming and equipment expensive. Herein, a simple and facilitated preparation method for the multifunctional wearable heater was developed, which springs Ag nanoparticles on the shish-kebab superstructure film via deposited melanin-like polydopamine as the adhesive. The light absorption ability of the resultant wearable heater in the visible region can be significantly enhanced by the addition of polydopamine, realizing a highly efficient photothermal conversion ability. Accordingly, it can achieve rapid warming ability whether passive heating (up to 45 °C about 60 s at 100 mW/cm2) or active heating (up to 72 °C about 40 s at 0.6 V), compared to ordinary cotton fabric. In addition, it can realize a 6.3 °C temperature difference with Cotton, showing excellent heat preservation ability. This study demonstrates a simple and low-cost approach for the prepared shish-kebab superstructure-based wearable heaters.
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Affiliation(s)
- Fengsen Xie
- National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), Zhengzhou University, Zhengzhou 450002, China
| | - Tengrui Wang
- National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), Zhengzhou University, Zhengzhou 450002, China
| | - Yingnuo Li
- National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), Zhengzhou University, Zhengzhou 450002, China
| | - Yamin Pan
- National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), Zhengzhou University, Zhengzhou 450002, China
| | - Pan Guo
- National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), Zhengzhou University, Zhengzhou 450002, China
| | - Chuntai Liu
- National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), Zhengzhou University, Zhengzhou 450002, China
| | - Changyu Shen
- National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), Zhengzhou University, Zhengzhou 450002, China
| | - Xianhu Liu
- National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), Zhengzhou University, Zhengzhou 450002, China
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Chai X, Zhu D, Liu Y, Qing Y, Luo F, Huang Z, Li P, Chen Q. In-situ construction of Cr 2O 3@ATO hybrid pigment towards synergetic enhancement of visible light-infrared-radar compatible stealth. J Colloid Interface Sci 2023; 645:570-579. [PMID: 37167907 DOI: 10.1016/j.jcis.2023.04.175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 04/22/2023] [Accepted: 04/30/2023] [Indexed: 05/13/2023]
Abstract
Multiband compatible stealth engineering with controllable visible light-infrared (VIS-IR) features and radar wave absorption is urgently needed to improve the survivability of advanced military equipment. Cr2O3 has good visible light stealth performance under green background, but it is lack of IR and radar multi-band stealth properties. Herein, a core-shelled Cr2O3@stannic antimony oxide (ATO) structure was developed to enhance the IR-radar compatible stealth properties of Cr2O3 by in-situ precipitation method, concurrently maintaining its visible light stealth property. The morphology, conductivity, and infrared stealth properties of the Cr2O3@ATO hybrids were influenced by the calcination temperature, and the IR and radar stealth performance were tunable by ATO content. The lowest emissivity of Cr2O3@ATO pigments is 0.852, reduced by 10% than pure Cr2O3. The Cr2O3@ATO filled silicone resin coatings possessed good thermal stability and IR stealth stability. Benefiting from the enhanced interfacial polarization and conductive loss, the Cr2O3@ATO exhibited an effective absorption bandwidth of 2 GHz in the X band, with respect to pure Cr2O3 without radar absorption property. The Cr2O3@ATO structure opens an avenue for advanced VIS-IR-Radar compatible stealth materials.
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Affiliation(s)
- Xia Chai
- State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
| | - Dongmei Zhu
- State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
| | - Yin Liu
- State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
| | - Yuchang Qing
- State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
| | - Fa Luo
- State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
| | - Zhibin Huang
- Shaanxi Huaqin Technology Industry Co., Ltd., Xi'an 710119, China
| | - Peng Li
- Shaanxi Huaqin Technology Industry Co., Ltd., Xi'an 710119, China
| | - Qiang Chen
- State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China.
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