Spray-assembly of thermoplasmonic nanoparticles: A speed-up fabrication strategy for energy-saving smart windows

Yu, Qiaoqi; Guo, Min; Xu, Wanxuan; Shi, Xiaodi; Ma, Ying; Yu, Jianyong; Ding, Bin

doi:10.1016/j.solener.2022.04.022

Cited by 7 publications

(4 citation statements)

References 58 publications

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“…Energy conservation and emission reduction have become a global challenge. It has been reported that the building energy consumption accounts for 40% of the total energy, − of which half is consumed by heating, ventilation, and air conditioning . Therefore, improving the energy efficiency of buildings is the key to energy conservation. − …”

Section: Introductionmentioning

confidence: 99%

Thermochromic Hydrogels with Adjustable Transition Behavior for Smart Windows

Chen,

Wu,

et al. 2024

ACS Appl. Mater. Interfaces

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With the fast economic development and accelerating urbanization, more and more skyscrapers made entirely of concrete and glass are being constructed. To keep a comfortable indoor environment, massive energy for air conditioning or heating appliances is consumed. A huge amount of heat (>30%) is gained or released through glass windows. Using smart windows with the capability to modulate light is an effective way to reduce building energy consumption. Thermochromic hydrogel is one of the potential smart window materials due to its excellent thermal response, high radiation-blocking efficiency, cost-effectiveness, biocompatibility, and good uniformity. In this work, polyhydroxypropyl acrylate (PHPA) hydrogels with controllable lower critical solution temperature (LCST) were prepared by photopolymerization. The transition temperature and transition rate under “static transition” conditions were investigated. Unlike “static” conditions in which the transition temperature was not affected by the initial and final temperature and heating/cooling ramp, the transition temperature varied with the rate of temperature change under dynamic conditions. The “dynamic” transition temperature of the PHPA hydrogel gradually increased with the increase of the heating rate. It was the result of the movement of the molecular chains lagging behind the temperature change when the temperature change was too fast. The results of the solar irradiation experiment by filling PHPA hydrogels into double glazing windows showed that the indoor temperature was about 15 °C lower than that of ordinary glass windows, indicating that it can significantly reduce the energy consumption of air conditioning. In addition, a wide range of adjustable transition temperatures and fast optical response make PHPA hydrogels potentially applicable to smart windows.

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Section: Introductionmentioning

confidence: 99%

Thermochromic Hydrogels with Adjustable Transition Behavior for Smart Windows

Chen,

Wu,

et al. 2024

ACS Appl. Mater. Interfaces

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“…Besides VO 2 , the most widely used traditional thermoregulatory material, [ 32–34 ] thermoresponsive hydrogels and microgels were also reported for thermoregulation. [ 35–37 ]…”

Section: Introductionmentioning

confidence: 99%

“…Besides VO 2 , the most widely used traditional thermoregulatory material, [32][33][34] thermoresponsive hydrogels and microgels were also reported for thermoregulation. [35][36][37] Here, we designed a light-responsive artificial chameleon skin that can sense temperature and alter its color expression by emulating the self-thermoregulation mechanism of Namibia chameleons. The strategy is to prepare patterned film with dynamic area change of solar energy adsorption and reflection.…”

mentioning

confidence: 99%

An Artificial Chameleon Skin for Dynamic Thermoregulation

Liu

Zhu

Gao

et al. 2023

Adv Materials Inter

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Namibia can adapt to environmental temperatures by changing their body colors between black and white. Their skins are dark in the morning to adsorb more solar radiation to reach an active body temperature, and then become white at hot noon to reflect solar energy to protect body temperature (Figure 1a). This physiological process is accomplished by moving melanin particles up and down around the thick layer of D-iridophores, which can reflect infrared light for thermal protection (Figure 1b). [14,15] Inspired by natural creatures, a wide variety of materials with specific functionalities such as high solar radiation absorption (e.g., carbon materials, [16][17][18][19][20][21] noble metal nanoparticles, [22,23] and structural materials [24][25][26][27] ) or reflection (whiteness [28,29] and metals [30,31] ) were reported. However, it is still a great challenge to design materials with both thermal adsorption and reflection functions to adapt to the dynamic surrounding environments. Up to date, most dynamic thermoregulatory materials were achieved by changing from transparent to opaque with temperature varies. Besides VO 2 , the most widely used traditional thermoregulatory material, [32][33][34] thermoresponsive hydrogels and microgels were also reported for thermoregulation. [35][36][37] Here, we designed a light-responsive artificial chameleon skin that can sense temperature and alter its color expression by emulating the self-thermoregulation mechanism of Namibia chameleons. The strategy is to prepare patterned film with dynamic area change of solar energy adsorption and reflection. The artificial skin consists of two parts: the thermoresponsive black part for light harvesting, and the stretchable white part for light reflection (Figure 1c). The black part is made of poly(Nisopropylacrylamide) (PNIPAM) hydrogel embedded with polydopamine (PDA) nanoparticles, which can adsorb light and convert it to heat; the white part is made of stretchable polyacrylamide (PAM) hydrogel embedded with polystyrene (PS) colloids, which reflect light like large guanine crystals. At low light irradiation and low temperature, the dark film dominates the surface, and the PDA nanoparticles adsorb the weak light and generate heat to increase body temperature. At high light irritation, when the temperature reaches the volume phase transition temperature (VPTT) of the PNIPAM hydrogel, the dark part begins to shrink, which in turn stretches the white PAM film to spread, and then the white part dominates the film and more Solar radiation is the major energy source for most living creatures, and some creatures change their skin colors responding to energy demands. Inspired by the chameleons that live in the desert of Namibia, which can regulate body temperature by changing skin colors between black and white, a patterned hydrogel film with self-thermoregulation ability is reported in this work. The film consists of two parts: a lightresponsive black part and a stretchable white part. The black part is made of thermoresponsive poly(N-isopro...

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“…Accordingly, it is essential to develop a low-emissivity material that can be applied in a straightforward manner while maintaining the functionality of low-e films. Recently, Yu et al fabricated energy-saving smart windows through the high-efficiency spray assembly of thermos plasmonic gold nanoparticles (Au NPs) [15]. Such methods for fabricating lowemissivity windows are relatively simple, but Au NPs are more expensive than Ag NPs.…”

Section: Introductionmentioning

confidence: 99%

Regulating Monolayer Aligned Silver Nanowire Coatings for Energy-Saving Windows

Shao

et al. 2022

Coatings

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Low-emissivity (low-e) glass has garnered considerable attention for implementation in energy-saving windows, which can effectively decrease the energy consumption of buildings. However, the traditional vacuum-coating technology of low-e films greatly enhances the cost of energy-saving windows, and the influence of the vacuum-coating parameters on the optical characteristics of low-e films necessitates a complex optimization process. Herein, we prepared Ag NWs with controllable diameters using the polyol method, and the alignment of the Ag NW film coating on glass substrates was regulated by the shear force of the liquid flow generated through magnetic stirring. After optimization, the low-εMIR windows based on aligned Ag NW (60 nm) coatings showed an optical transmittance of 84.4% and a low εMIR of 0.3, which were superior to those of commercial low-εMIR glass (T: 65.6%; εMIR: 0.4). The simplicity and low cost of aligned Ag NW coatings for low-e glass open up a new avenue for reducing energy consumption in existing windows.

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Spray-assembly of thermoplasmonic nanoparticles: A speed-up fabrication strategy for energy-saving smart windows

Cited by 7 publications

References 58 publications

Thermochromic Hydrogels with Adjustable Transition Behavior for Smart Windows

Thermochromic Hydrogels with Adjustable Transition Behavior for Smart Windows

An Artificial Chameleon Skin for Dynamic Thermoregulation

Regulating Monolayer Aligned Silver Nanowire Coatings for Energy-Saving Windows

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