Synthesis of dual cross-linked ion conductive temperature-sensitive hydrogel and its application in tunable smart window

Wu, Leqi; Yu, Qijian; Wang, Sui; Mao, Jie; Guo, Zhiyong; Hu, Yufang

doi:10.1007/s10853-022-07433-z

Cited by 8 publications

(2 citation statements)

References 38 publications

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“…As many researchers considered, ideal TC smart window materials typically require high solar modulation (ΔT so 50%) and a phase transition temperature close to room temperature (T c ~26°C) [19,20]. Recently, the temperature-responsive hydrogel polymers with amphiphilic features that can spontaneously and reversibly change the solubility state have gained massive attention [21]. When the temperature is lower than the lower critical solution temperature (LCST), the polymer is hydrophilic and completely miscible with water; when the temperature is higher than LCST, its hydrophobicity increases, and the polymer shrinks in volume, discharging the water slowly [22].…”

Section: Introductionmentioning

confidence: 99%

pH-sensitive tunable thermochromic hydrogel with carbon quantum dots for smart windows

Zhong,

Xue,

Wang

et al. 2024

NSO

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Thermoresponsive hydrogels have been designed for smart windows to dynamically modulate solar radiation, but their inherent drawbacks of long response time and imperfectly matched phase transition temperature have limited their wide applications. This work reports a novel composite hydrogel consisting of hydroxypropyl cellulose, polyacrylic acid, and carbon quantum dots with intriguing features of tunable transition temperature and enhanced switching speed. The composite hydrogel demonstrated flexible tunability in transition temperature by controlling the hydrogen ion concentration and a fast response speed by dopping with carbon dots for efficient photothermal conversion. The building energy simulation was carried out to investigate the impacts of transition temperature variations and solar regulations on the space cooling/heating loads under different climate conditions, revealing the necessity of tunability of both transition temperature and solar transmittance in thermochromic smart windows. This novel design of thermochromic composite hydrogel provides insight into theoretical and experimental support for future adaptive building envelopes.

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Section: Introductionmentioning

confidence: 99%

pH-sensitive tunable thermochromic hydrogel with carbon quantum dots for smart windows

Zhong,

Xue,

Wang

et al. 2024

NSO

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“…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.…”

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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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Fabricating Biodegradable Tissue Scaffolds Through a New Aggregation Triggered Physical Cross‐Linking Strategy of Hydrophilic and Hydrophobic Polymers

Kaga,

Kaga

2024

Macro Materials & Eng

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In the study, a new strategy is presented to make PLGA (poly lactic‐co‐glycolic acid) and POEGMEMA (poly(oligo(ethylene glycol) methyl ether methacrylate)) based biodegradable and biocompatible tissue scaffold via a new physical cross‐linking method. The advantage of brushed structure of POEGMEMA polymer and the hydrophobic character of PLGA polymer is taken to make physically entangled network in aqueous media. The hydrophobic nature of PLGA allows to get scaffolds even at low ratio of PLGA (25%, w/w) when using POEGMEMA (yield: 86%). This strategy gives robust polymeric networks in aqueous media without using chemical reactions through high hydrophilic polymer content. Scaffolds with high POEGMEMA ratio (75%, w/w) show two times higher water uptake ratio (≈300%) and two times lower compression strength (19 kPa) compared to the ones with lower POEGMEMA content (50%, w/w). They also show desired degradation profiles in various aqueous solutions. While the scaffolds prepared with 25% and 50% PLGA are almost stable in first 20 days, they completely degrade in 40–50 days. Both scaffold formulations (25% PLGA‐75% POEGMEMA and 50% PLGA‐50% POEGMEMA) have similar proliferative properties for fibroblast cells. The scaffolds also do not show toxicity compared to control group according to live‐dead assay.

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Synthesis of dual cross-linked ion conductive temperature-sensitive hydrogel and its application in tunable smart window

Cited by 8 publications

References 38 publications

pH-sensitive tunable thermochromic hydrogel with carbon quantum dots for smart windows

pH-sensitive tunable thermochromic hydrogel with carbon quantum dots for smart windows

An Artificial Chameleon Skin for Dynamic Thermoregulation

Fabricating Biodegradable Tissue Scaffolds Through a New Aggregation Triggered Physical Cross‐Linking Strategy of Hydrophilic and Hydrophobic Polymers

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