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Hybrid Plasmonic‐Aerogel Materials as Optical Superheaters with Engineered Resonances
摘要： Solar radiation is a versatile source of energy, convertible to different useful forms of power. A direct path to exploit it is the generation of heat, for applications including passive building heating, but it can also drive secondary energy conversion steps. We present a novel concept for a hybrid material which is both strongly photo-absorbing and with superior characteristics for the insulation of heat. The combination of that two properties is rather unique, and make of this material an optical superheater. To realize such material, we are combining plasmonic nanoheaters with alumina aerogel. In our hybrid material, the aerogel has the double function of providing structural support for plasmonic nanocrystal, which serve as nanoheaters, and reducing the diffusion rate of the heat generated by them, resulting in large local temperature increases under a relatively low radiation intensity. Alongside their optical and photothermal properties, this work includes theoretical discussion on the physical mechanisms impacting the system’s balanced thermal equilibrium.
关键词： hybrid aerogel,photoheater,energy conversion,surface plasmon resonance,gels
更新于2025-09-19 17:13:59
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Design, mathematical modelling and experimental investigation of vacuum insulated semi-transparent thin-film photovoltaic (PV) glazing
摘要： This paper aims to investigate a novel design of vacuum insulated semi-transparent thin-film photovoltaic (PV) glazing called ‘PV VG-2L’, focusing on its thermal performance. The PV VG-2L consists of two parallel glass panes; a semi-transparent thin-film PV glass and a 4 mm hard low-E coated glass, separated by a 0.3 mm vacuum gap. Unlike the conventional vacuum glazing that uses stainless steel, ceramic or alumina as the support pillars, strong and low thermally conductive aerogel material was employed to prevent the glass panes from collapsing under atmospheric pressure. To investigate its performance, a mathematical model for PV VG-2L was developed and numerically solved in MATLAB. The developed model was then validated against indoors and outdoors lab-scale experiments. To conduct the experiments, two PV VG-2L prototypes were manufactured using an innovative low-temperature high-level vacuum method. Using the validated mathematical model, at its optimum design, the performance of the PV VG-2L was numerically simulated, yielding an average U-value as low as 0.60 W/m2K. The promising U-value implies that the PV VG-2L investigated in this research has a wide range of potential applications depending on the energy needs and application.
关键词： aerogel pillars,low U-value,innovative PV VG manufacturing method,semi-transparent thin-film PV
更新于2025-09-19 17:13:59
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Hybrid Plasmonic-Aerogel Materials as Optical Superheaters with Engineered Resonances
摘要： Solar radiation is a versatile source of energy, convertible to different useful forms of power. A direct path to exploit it is the generation of heat, for applications including passive building heating, but it can also drive secondary energy conversion steps. We present a novel concept for a hybrid material which is both strongly photo-absorbing and with superior characteristics for the insulation of heat. The combination of that two properties is rather unique, and make of this material an optical superheater. To realize such material, we are combining plasmonic nanoheaters with alumina aerogel. In our hybrid material, the aerogel has the double function of providing structural support for plasmonic nanocrystal, which serve as nanoheaters, and reducing the diffusion rate of the heat generated by them, resulting in large local temperature increases under a relatively low radiation intensity. Alongside their optical and photothermal properties, this work includes theoretical discussion on the physical mechanisms impacting the system’s balanced thermal equilibrium.
关键词： surface plasmon resonance,hybrid aerogel,energy conversion,gels,photoheater
更新于2025-09-11 14:15:04
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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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A Flexible Photothermal Cotton-CuS Nanocage-Agarose Aerogel towards Portable Solar Steam Generation
摘要： Solar-steam generation provides an economically efficient pathway to produce clean water by using solar light as an energy source. While this strategy is highly suitable for portable and small scale water purification for individuals, families and those living in remote areas, the development of highly efficient and flexible photothermal materials which can be easily transported for storage and deliver is required. In this study, a commercial degreasing cotton, photothermal CuS yolk-shell nanocages and agarose were combined to produce a highly flexible photothermal aerogel which delivered a high energy efficiency (94.9%) for solar-steam generation under 1.0 sun irradiation, corresponding to a water evaporation rate of 1.63 kg m-2 h-1. The preparation of the photothermal aerogel can be easily scaled up due to the simplicity of the applied casting method. The obtained aerogel showed excellent stability for solar steam generation with no degradation in performance after at least 15 cycles. The salinity of the clean water produced during solar-thermal desalination of seawater was only 0.54 ppm. The raw materials of cotton, agarose and CuS are all cost effective, thus this flexible photothermal aerogel has showed great potential for practical application in portable solar-thermal evaporators.
关键词： solar-thermal energy,nanocages,aerogel,water evaporation,Photothermal
更新于2025-09-09 09:28:46
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Synthesis of novel form-stable composite phase change materials with modified graphene aerogel for solar energy conversion and storage
摘要： In this study, novel kinds of form-stable composite phase change materials (FS-CPCM) were prepared by the vacuum impregnation method. In the FS-CPCM, lauric acid (LA) was the PCM, and LA was grafted on the surface of graphene aerogel (GA) by an esteri?cation reaction and reduction process to prepare supporting material and increase the thermal conductivity of the FS-CPCMs. The microstructure, thermal storage properties, thermal conductivity and light-to-heat conversion of the FS-CPCMs were investigated. Scanning electron microscopy and Fourier transform infrared spectroscopy were used to demonstrate that the LA was encapsulated e?ectively in the porous structure of the LA-GA, and the LA/LA-GA FS-CPCMs were prepared successfully. X–ray di?ractometer results con?rmed that the crystallization of the LA/LA-GA FS-CPCM was better than that of LA/GA FS-CPCM. Thermal conductivity analyses indicated that the thermal conductivities of the LA/LA-GA-1 FS-CPCMs increased 352.1% and 32.6% compared with the conductivities of LA and LA/GA FS-CPCM, respectively. Di?erential scanning calorimetry results con?rmed that the LA/LA-GA-1 FS-CPCM possess good phase change behavior, low undercooling and excellent thermal cycling stability. The melting enthalpy and freezing enthalpy could reach 207.3 J/g and 205.8 J/g, respectively, and the LA/LA-GA FS-CPCM exhibited good thermal reliability and stability. Furthermore, the LA/LA-GA FS-CPCM had excellent photon absorption and the highest e?ciency in terms of light-to-heat conversion of 80.6%. Such good performances demonstrate the LA/LA-GA FS-CPCM's potential for use in solar energy storage systems.
关键词： Phase change materials,Thermal conductivity,Graphene aerogel,Solar energy conversion
更新于2025-09-04 15:30:14
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Z‐scheme Polyimide/AgBr@Ag aerogel with excellent photocatalytic performance for degradation of oxytetracycline
摘要： A novel Z-scheme Polyimide (PI)/AgBr@Ag aerogel photocatalyst has been successfully synthesized by combining in-situ precipitation method and supercritical drying method. The as-prepared PI/AgBr@Ag-50 (50 wt% of AgBr@Ag in PI/AgBr@Ag) aerogel photocatalyst exhibited excellent photocatalytic activity for oxytetracycline degradation with a rate constant of 0.025 min-1, which was 6.9 and 2.6 times as many as that of PI aerogel and AgBr@Ag nanoparticles, respectively. More significantly, PI/AgBr@Ag-50 aerogel photocatalyst showed stable cycling, which could be attributed to the high mechanical strength and 3-D network of PI aerogel. The introduction of AgBr@Ag on PI with the formed hetero-junction structure efficiently promoted the separation of electron-hole pairs by a Z-scheme mechanism. The reduced metallic Ag nanoparticles were found to function as the center for the accumulation of electrons from AgBr to PI. This work found a new application of PI/AgBr@Ag aerogel photocatalyst in environmental protection.
关键词： Aerogel photocatalyst,Polyimide,Oxytetracycline,Stability,AgBr@Ag
更新于2025-09-04 15:30:14
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Constructing excellent electromagnetic wave absorber with dielectric-dielectric media based on 3D reduced graphene and Ag(I)-Schiff base coordination compounds
摘要： The dielectric-dielectric composite (SRGA) for electromagnetic absorber was fabricated via integrating Ag(I)-Schiff base coordination compounds (SSBCC) with three-dimensional reduced graphene aerogel (3D-rGA) powders. SRGA showed excellent electromagnetic wave absorption properties in terms of re?ection loss, absorption band width and absorber thickness. Specially, when the mass ratio of SSBC to 3D-rGA powders was 1:3 (SRGA-25), the maximum value of re?ection loss at 2 mm was up to (cid:1)63.82 dB and the effective frequency bandwidth of 6.28 GHz (10.16e16.44 GHz) at 2.5 mm can be obtained. The mechanism investigation of electromagnetic wave absorption for SRGA showed that the enhanced electromagnetic wave absorption was ascribed to enhanced polarization loss derived from good 3D-conductive-network units of 3D-rGA, abundant interfaces caused by the media heterostructure due to the introduction of SSBCC and the good impedance matching condition. And 3D-rGA based materials might be put into practical application only in powder state due to the very low strength of the buck state. Therefore, the investigation on SRGA in our contribution is considered to be an actual performance evaluation of the materials based on three-dimensional graphene for microwave attenuation. This work also provided a method for fabricating excellent graphene-based electromagnetic wave absorbers by simply mixing a suitable dielectric lossy material, e.g. SSBCC.
关键词： Electromagnetic wave absorber,Schiff base,Composite,Microwave attenuation,Graphene aerogel
更新于2025-09-04 15:30:14