- 标题
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- 实验方案
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A Novel Multilayer Sandwich Fabric-based Composite Material for Infrared Stealth and Super Thermal Insulation Protection
摘要： At present, infrared stealth materials for advanced detection and stealth technology is usually prepared with low emissivity coating on the surface, but there are very few efficient infrared stealth materials based on textiles with lightweight and flexible features. In this paper, we designed a carbon nanotube-doped aerogel (CNTAs) sandwich structure on polyimide (PI) fabric by hot pressing and then coated with a low emissivity Al-doped ZnO (ZAO) on the outer surface. The surface emissivity lower than 0.5 due to the existence of ZAO and the thermal conductivity of the intermediate interlayer aerogels as low as 0.013 W/(m?K). Additionally, through experiments, theoretical derivation and simulation analysis, we found the resultant composite demonstrated a high infrared stealth performance with super insulation effect, implying it will have a fine prospect in infrared stealth and thermal insulation protection fields with its unique structure and excellent properties.
关键词： Carbon Nanotube-doped Aerogel,Sandwich Structure,Infrared Stealth,Polyimide Fabric,Thermal Insulation,Al-doped ZnO
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE 13th Annual International Conference on Nano/Micro Engineered and Molecular Systems (NEMS) - Singapore, Singapore (2018.4.22-2018.4.26)] 2018 IEEE 13th Annual International Conference on Nano/Micro Engineered and Molecular Systems (NEMS) - A Pyroelectric Infrared Detector By Integrating LiTaO<inf>3</inf> Single Crystal with Grooved Quartz Using UV Adhesive
摘要： A new pyroelectric infrared detector structure has been fabricated by integrating LiTaO3 single crystal with air gap thermal insulation structure using MEMS technology. The device shows excellent pyroelectric properties and thermal performance. Results demonstrate that the pyroelectric performance of detectors with air gap thermal insulation structure can be improved by the area of air gap. It was demonstrated that if the area of air gap got increased, the thermal time constant of LiTaO3 bulk would be more well-distributed and the pyroelectric performance of detector would be improved.
关键词： air gap,MEMS,pyroelectric infrared detector,thermal insulation,LiTaO3
更新于2025-09-23 15:22:29
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Metal Vapor Lasers
摘要： The milestones in the development of researches connected with metal vapor lasers, which have been carried out at V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, since its first days are considered. Some of the most interesting fundamental and applied results are presented. A fairly extensive list of related works, published mainly in the past twenty years, is given.
关键词： brightness amplifier,active thermal insulation,active impurity generator,optical pumping,metal vapor lasers,laser efficiency,metal halides,active optical systems,inner reactor
更新于2025-09-23 15:19:57
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Construction of ultraviolet protection, thermal insulation, superhydrophobic and aromatic textile with Al-doped ZnO–embedded lemon microcapsule coatings
摘要： Multifunctional textiles combining ultraviolet protection, thermal insulation, superhydrophobic and aromatic performance were successfully prepared using an aluminum-doped zinc oxide (AZO)-embedded lemon microcapsule and SiO2 dual-layer coating. AZO-loaded lemon microcapsules with average diameter of 1.5 mm were obtained via interfacial polymerization. Results showed that the high concentration of the AZO-embedded lemon microcapsule contributed to enhancing the waterproof property, aromatic performance, and visible and near-infrared light transmittance. The lemon content was up to 2.789 mg/g (weight of essence:weight of fabric). The water contact angle was high at 153.35°, exhibiting an outstanding superhydrophobic performance. The light transmittance decreased as the amount of AZO-embedded lemon microcapsule increased. The ultraviolet protection factor value reached 88.78 when the dosage of the AZO-embedded lemon microcapsule was 6%. Given the above research results, the cotton fabric coated with the AZO-embedded lemon microcapsule and SiO2 dual-layer composite coating would have potential applications in the water/oil purification field and functional protective fabrics.
关键词： AZO-embedded lemon microcapsule,aromatic textile,superhydrophobic,thermal insulation,ultraviolet protection
更新于2025-09-19 17:15:36
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High-performance subambient radiative cooling enabled by optically selective and thermally insulating polyethylene aerogel
摘要： Recent progress in passive radiative cooling technologies has substantially improved cooling performance under direct sunlight. Yet, experimental demonstrations of daytime radiative cooling still severely underperform in comparison with the theoretical potential due to considerable solar absorption and poor thermal insulation at the emitter. In this work, we developed polyethylene aerogel (PEA)—a solar-reflecting (92.2% solar weighted reflectance at 6 mm thick), infrared-transparent (79.9% transmittance between 8 and 13 mm at 6 mm thick), and low-thermal-conductivity (kPEA = 28 mW/mK) material that can be integrated with existing emitters to address these challenges. Using an experimental setup that includes the custom-fabricated PEA, we demonstrate a daytime ambient temperature cooling power of 96 W/m2 and passive cooling up to 13°C below ambient temperature around solar noon. This work could greatly improve the performance of existing passive radiative coolers for air conditioning and portable refrigeration applications.
关键词： subambient cooling,solar reflectance,thermal insulation,polyethylene aerogel,radiative cooling
更新于2025-09-11 14:15:04
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Untersuchungen zum ganzj?hrigen W?rmeschutz an Varianten eines kombinierten Dachaufbaus mit Photovoltaik und Begrünung
摘要： Investigation of the year-round thermal buffering effect of a combined green roof with photovoltaics. Research projects on the possible synergies of green roof (GR) and photovoltaics (PV) carried out a decade ago. Today, this combination is well known for its advantages to achieve better yields, through the cooling process of evapotranspiration of the plants, the simultaneous use of the GR’s advantages and very good thermal properties. All previous studies on combinations PV+green-roof in the literature focus on PV optimization, PV yield and PV temperatures. Within the scope of the research project ?GrünPlusSchule@Ballungszentrum“ in Vienna, different combinations of PV+greening (fa?ade and/or roof) were tested. This article presents temperature measurement results of PV+green-roofs and its comparison to a normal extensive GR. Exciting results were founded: the combination PV+GR works as a year-round thermal buffer.
关键词： Green roof,Winter thermal protection,Summer thermal insulation,PV+green roofs-combination,Photovoltaics
更新于2025-09-10 09:29:36
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Use of a new agricultural product as thermal insulation for solar collector
摘要： Sources of clean energy are becoming increasingly common, and the use of solar thermal energy has also been rising. This paper presents a solar air heater designed with a vegetable material as insulating material, date palm wood, widespread in tropical and saharan countries for use in drying. The study focuses on the comparative thermal performance of this collector and another collectors identical in design, fabrication, and operating under the same conditions, using glass wool as heat insulation. The thermal efficiencies of differents insulators collectors were performed : a) insulator with Petiole Piece, b) insulator with Fibers Piece, c) insulator with Petiole powder, d) insulator with Fibers powder, e) insulator with Petiole + gypsum, f) insulator with Fibers + gypsum insulatin and collector with glass wool insulation were evaluated and graphs were plotted. The final resuls showed that thermal efficiencies of date palm wood (Petiole + gypsum) insulated collector was 37.7 % higher than glass wool insulated collector. The average outlet air temperature of glass wool insulated was 7 % lower than Petiole + gypsum insulated collector. Hence the date palm wood is a good candidate for the development of efficient and safe insulating materials.
关键词： Solar collector,date palm petiole,thermal insulation,gypsum,date palm fibers,glass wool
更新于2025-09-10 09:29:36