Nickel nanoparticles individually encapsulated in densified ceramic shells for thermally stable solar energy absorption

2019 ◽  
Vol 7 (7) ◽  
pp. 3039-3045 ◽  
Author(s):  
Dawei Ding ◽  
Kai Liu ◽  
Qikui Fan ◽  
Bitao Dong ◽  
Yang Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Solar Energy ◽  
Energy Absorption ◽  
Nickel Nanoparticles ◽  
Thermal Conversion ◽  
Solar Thermal ◽  
Thermally Stable ◽  
Spectrally Selective ◽  
Thermal Stability Of

Encapsulation of nickel nanoparticles in densified silica nanoshells enhances the thermal stability of spectrally selective absorbers for high-temperature solar-thermal conversion systems.

scholarly journals Optical Properties of Plasma Dimer Nanoparticles for Solar Energy Absorption

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2722
Author(s):  
Chunlei Sun ◽  
Caiyan Qin ◽  
Han Zhai ◽  
Bin Zhang ◽  
Xiaohu Wu
Keyword(s):  
Optical Properties ◽  
Solar Energy ◽  
Energy Absorption ◽  
Visible Region ◽  
Thermal Conversion ◽  
Solar Thermal ◽  
Ag Nanoparticle ◽  
Absorption Bands ◽  
Resonance Band ◽  
Conversion Technology

Plasmonic nanofluids have excellent optical properties in solar energy absorption and have been widely studied in solar thermal conversion technology. The absorption of the visible region of solar energy by ordinary metal nanoparticles is usually limited to a narrow resonance band, so it is necessary to enhance the coupling effect of nanoparticles in the visible spectrum region to improve absorption efficiency. However, it is still a difficult task to improve solar energy absorption by adjusting the structure and performance of nanoparticles. In this paper, a plasma dimer Ag nanoparticle is proposed to excite localized surface plasmon resonance (LSPR). Compared with an ordinary Ag nanoparticle in the visible region, the plasmonic Ag dimer nanoparticle produces more absorption peaks and broader absorption bands, which can broaden solar energy absorption. By analyzing the electromagnetic field of the nanoparticle, the resonance mode of the plasma dimer is discussed. The effects of the geometric dimensions of the nanoparticle and the embedding of two spheres on the optical properties are studied. In addition, the effects of a trimer and its special structure on the optical properties are also analyzed. The results show that the proposed plasma dimer Ag nanoparticle has broad prospects for application in solar thermal conversion technology.

Structure, optical properties and thermal stability of SS/TiC–ZrC/Al2O3 spectrally selective solar absorber

RSC Advances ◽  
2016 ◽  
Vol 6 (68) ◽  
pp. 63867-63873 ◽  
Author(s):  
Xiang-Hu Gao ◽  
Zhi-Ming Guo ◽  
Qing-Fen Geng ◽  
Peng-Jun Ma ◽  
Ai-Qin Wang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Optical Properties ◽  
High Temperature ◽  
Magnetron Sputtering ◽  
Solar Absorber ◽  
Spectrally Selective ◽  
Thermal Stability Of

A tandem layer structured SS/TiC–ZrC/Al2O3 coating has been prepared by magnetron sputtering as a high temperature spectrally selective solar absorber.

Simultaneous Implant Activation and Isolation Formation in GaAs in a Single High-Temperature Anneal

1992 ◽  
Vol 262 ◽  
Author(s):  
Kei-Yu Ko ◽  
S. Chen ◽  
G. Braunstein ◽  
L.-R. Zheng ◽  
S.-T. Lee
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
High Temperatures ◽  
Active Regions ◽  
High Resistivity ◽  
Thermally Stable ◽  
Electrical Isolation ◽  
Device Processing ◽  
High Temperature Anneal ◽  
Thermal Stability Of

ABSTRACTUsing void-related compensation in Al-implanted GaAs, high-resistivity isolation regions that are thermally stable to high temperatures (> 700 °C) are demonstrated. The high-temperature thermal stability of the isolation regions allows the simplification of device processing in which a single high-temperature anneal (e.g., at 900 °C) can be used to activate the implant dopants in the device-active regions, and simultaneously to convert the Al-implanted regions highly resistive for electrical isolation. Other advantages of using void-related isolation will also be discussed.

AlMoN based spectrally selective coating with improved thermal stability for high temperature solar thermal applications

Solar Energy ◽  
2015 ◽  
Vol 119 ◽  
pp. 114-121 ◽  
Author(s):  
N. Selvakumar ◽  
K. Rajaguru ◽  
Girish M. Gouda ◽  
Harish C. Barshilia
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Solar Thermal ◽  
Selective Coating ◽  
Spectrally Selective ◽  
Solar Thermal Applications

scholarly journals Thermal Stability of Chromium-Iron Oxidation Mixture Cermet-Based Solar Selective Absorbing Coatings

Molecules ◽  
2020 ◽  
Vol 25 (5) ◽  
pp. 1178 ◽  
Author(s):  
Hongwen Yu ◽  
Jinkai Li ◽  
Qian Zhang ◽  
Wei Pang ◽  
Hui Yan ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Iron Oxidation ◽  
Optical Trap ◽  
Thermal Conversion ◽  
Performance Criterion ◽  
Solar Thermal ◽  
Solar Absorptance ◽  
Solar Thermal System ◽  
First Time ◽  
Thermal Stability Of

The solar selective absorber coating (SSAC) are at the core of the efficient solar-thermal system. In this paper, for the first time, the Chromium-iron oxidation mixture cermet was successfully prepared on the surface of ultra-pure ferritic stainless steel by chemical coloring as SSAC. The coating surface has an optical trap structure, and the chromium-iron oxidation mixture cermet is used as an absorption layer to realize solar-thermal conversion. The solar absorptance (AM1.5) of the coating reached 93.66, and the thermal emittance was less than 13. After thermal shock tests at 25/300 °C done 32 times (accumulated 812.8 h), the Performance Criterion (PC) of the coating was 0.01375 < 0.05, showing outstanding thermal stability.

Gelation Kinetics and Performance Evaluation of an Organically Crosslinked Gel at High Temperature and Pressure

SPE Journal ◽  
2008 ◽  
Vol 13 (03) ◽  
pp. 337-345 ◽  
Author(s):  
Ghaithan A. Al-Muntasheri ◽  
Hisham A. Nasr-El-Din ◽  
Pacelli L.J. Zitha
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Gelation Time ◽  
Polymer Gels ◽  
Water Production ◽  
Thermally Stable ◽  
Covalent Bonds ◽  
Pressure Drops ◽  
Gelation Kinetics ◽  
Thermal Stability Of

Summary Organically crosslinked gels have been used to control water production in high temperature applications. These chemical systems are based on the crosslinking of a polyacrylamide-based polymer/copolymer with an organic crosslinker. Polyethyleneimine (PEI) has been used as an organic crosslinker for polyacrylamide-based copolymers to provide thermally stable gels. Literature reported that PEI can form aqueous gels with polyacrylamide (PAM) at room temperature. In this paper, we show for the first time the possibility of crosslinking polyacrylamide with PEI at temperatures up to 140°C (285°F) and pressures up to 30 bars (435 psi). This paper reports data both in bulk and in porous media. The gelation time of the PAM crosslinked with PEI at high temperatures up to 140°C (285°F) and pressures up to 435 psi (30 bars) was measured. The effects of polymer concentration, crosslinker concentration, temperature, salinity, initial pH value, and the initial degree of hydrolysis of the polymer on the gelation time were examined in detail. All measurements were conducted in the steady shear mode. 13C Nuclear Magnetic Resonance Spectroscopy (13C NMR) was used to relate the gelation time to changes in the structure of the polymer and hence explain the variation in the gelation time in terms of the gelling system chemistry. In bulk, thermally stable gels were obtained by crosslinking PAM with PEI at 130°C (266°F) for at least 8 weeks. The performance of the PAM/PEI system in sandstone cores at a temperature of 90°C (194°F) and pressure drops of 68.95 bars (1,000 psi) was examined. The system was found to be stable for 3 weeks, where the permeability was reduced by a factor of 100%. Introduction Water production is a serious problem in petroleum-producing operations. Additional costs are imposed by processing, treating, and disposing unwanted water. Of the available remediation techniques, chemical methods using polymer gels have been widely applied. The success rate of these chemical treatments depends, among other factors, on the understanding of gelation kinetics, gelant's compatibility with reservoir fluids, and thermal stability of the final gel. Polymer gels have been used to reduce water production through the disproportionate permeability reduction (DPR) (Zaitoun and Kohler 1988; Liang et al. 1995). In DPR, the relative permeability to water is reduced to a greater extent than that to oil (or gas). Polymer gels were also used to totally block the pore space of the water producing zones in both matrix (Vasquez et al. 2003) and fractures (Alqam et al. 2001). Polymer gels are generally classified into two categories based on the nature of polymer/crosslinker bonding chemistry. The first type is inorganic gel systems based on the crosslinking of the carboxylate groups on the partially hydrolyzed polyacrylamide chain (PHPA) with a trivalent cation like Cr(III) (Sydansk 1990; Lockhart 1994). This crosslinking is believed to rely on coordination covalent bonding. It should be mentioned that Cr(III)-carboxylate/acrylamide-polymer gels (CC/AP) were reported to be stable at temperatures up to 148.9°C (300°F) in Berea cores under pressure drops of 68.95 bars (1,000 psi) (Sydansk and Southwell 2000). The second class of polymer gels is based on covalent bonds between the crosslinker and the acrylamide-based polymer (Morgan et al. 1998; Moradi-Araghi 2000). High temperature applications require the use of thermally stable covalently bonded systems. However, these covalent bonds do not guarantee long-term stability. Literature reports (Moradi-Araghi 2000) highlight the importance of using a thermally stable polymer to produce thermally stable gels. Polyacrylamide-based polymers are known to hydrolyze at high temperatures causing gel syneresis (expulsion of water out of the gel structure due to over crosslinking) (Moradi-Araghi 2000), especially in brines with high contents of Mg+2 and Ca+2, where polymer precipitation may also occur (Moradi-Araghi and Doe 1984). Therefore, more thermally stable monomers are copolymerized with the acrylamide polymer to minimize excessive hydrolysis (Moradi-Araghi et al. 1987; Doe et al. 1987) and enhance thermal stability of the produced gel.

scholarly journals Structure, optical simulation and thermal stability of the HfB2-based high-temperature solar selective absorbing coatings

RSC Advances ◽  
2019 ◽  
Vol 9 (51) ◽  
pp. 29726-29733 ◽  
Author(s):  
Xiao-Li Qiu ◽  
Xiang-Hu Gao ◽  
Cheng-Yu He ◽  
Bao-Hui Chen ◽  
Gang Liu
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Transition Metal ◽  
Solar Thermal ◽  
Optical Simulation ◽  
Metal Borides ◽  
Solar Thermal Applications ◽  
Thermal Stability Of

Transition metal borides are a kind of potential materials for high-temperature solar thermal applications.

The Thermal Stability of a TiAl Based Alloy

1994 ◽  
Vol 364 ◽  
Author(s):  
C. Jin ◽  
W. Chen ◽  
J. Wang ◽  
X. Wan
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Significant Variation ◽  
Thermal Exposure ◽  
Thermally Stable ◽  
Bending Tests ◽  
Exposure Temperature ◽  
Alloy Microstructure ◽  
Thermal Stability Of

AbstractThe thermal stability of a TiAl based alloy was investigated through a series of high temperature exposures in air and vacuum. The microstructures were found to be thermally stable. The bending tests showed that both ductility and strength of air-exposed specimens decreased, but no significant variation was observed in those exposed in vacuum. The influence of alloy microstructure, thermal exposure temperature and time was also taken into account here.

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