Thermochromic smart windows with broad-range customizable responsive temperature <i>via</i> the Hofmeister effect

“…Such temperature is sufficient to induce the thermochromism based on the prevailing thermochromic materials including inorganic vanadium dioxide (VO 2 , 68 °C) or organic poly(Nisopropylacrymide) (PNIPAM, 32 °C). 19,30 Taking advantage of the LBL assembly technique that enables the precise control of the thickness, the AgNWs/ MXene nanosheets with different numbers of deposited layers can be therefore designed to investigate the effect of layer number on the transparency and electrothermal property. As shown in Figure 3a, the AgNWs/MXene-coated glass gradually becomes dark with the increased number of layers, which is due to the light absorption of MXene within the UV-vis-NIR range (Figure S4).…”

mentioning

confidence: 99%

“…Under an applied voltage of 5 V, the (AgNWs/MXene) 1 glass can reach a temperature of 57.4 °C after 3 min, while the (AgNWs/MXene) 2 glass, (AgNWs/MXene) 3 glass, and (AgNWs/MXene) 4 glass can reach temperatures of 71.6, 84.5, and 102 °C (Figure S3), respectively. Such temperature is sufficient to induce the thermochromism based on the prevailing thermochromic materials including inorganic vanadium dioxide (VO 2 , 68 °C) or organic poly( N -isopropylacrymide) (PNIPAM, 32 °C). , …”

mentioning

confidence: 99%

Dynamically Tunable Thermochromic Smart Windows for Building Energy Conservation

Peng,

Fu,

Zhao

et al. 2024

ACS Materials Lett.

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Thermochromic smart windows (TSWs) exist passive regulation for building energy conservation, which are challenging to be artificially manipulated. The electrothermal stratagem has been explored for introducing the "active control" function. However, it is limited by the excess electricity consumption. Here, we fabricate a TSW with electricity-efficient tunable functions by combining transparent photothermal and electrothermal technologies. The "active control" function is escorted by a transparent electrode with electrical conductivity and photothermal efficiency from layer-by-layer (LBL) assembled silver nanowires and MXene nanosheets. It shows high transparent sunlight conversion to lower the inherent temperature threshold for thermochromism and retrenches the electricity consumption. Under the synergistic effect of photothermal and electrothermal processes, the TSWs show remarkable solar modulation (ΔT sol = 61.8%) during both summer and winter. The LBL-assembly technique is simple to manipulate, which provides an energetic paradigm for the commercial applications of TSWs while enabling superb annual building energy conservation.

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Flexible and Stretchable Thermoresponsive Display for Multifunctional Device Applications

Kumar,

Sharma,

Bendi

et al. 2024

Adv Eng Mater

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Metal–organic frameworks (MOFs) have been recognized vastly as stimuli‐responsive materials owing to their extreme sensitivity toward the stimuli that make them flawless nominees for multifunctional device applications. However, MOFs are often oversensitive toward moisture, which significantly affects their stable responses and reproducibility. Herein, a MOF–polymer display (i.e., copper‐based MOF with polydimethylsiloxane) is developed that exhibits high sensitivity toward temperature changes without getting affected by moisture. In response to the thermal gradient, the display exhibits the change in color from sky blue to dark blue when the temperature varies from 30 to 100 ºC, which is attributed to the second‐order phase transition within the time interval 40 s and reversible in 60 s. To provide insights on the mechanism, ex situ UV–vis and temperature‐dependent operando X‐day diffraction are conducted, which unveils that the color change in the display is associated with reversible contraction/expansion of the unit cell parameters. In addition to that, the thermoresponse of the display remains unaffected under mechanical deformations, which indicates that the color display is mechanically and thermally stable. The as‐developed color display is mechanically robust and highly sensitive toward temperature change; it can be utilized as the color indicator in signaling temperature rise in smart mobiles or laptops during discharging to keep the user safe or applications in augmented intelligence.

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Thermochromic smart windows with broad-range customizable responsive temperature via the Hofmeister effect

Abstract: Thermochromic smart windows exhibit intelligent building energy conservation once the ambient temperature is higher than their responsive temperature (Tr). However, most current smart windows regulate the light at an invariable...

Cited by 5 publications

References 51 publications

Engineering a polyvinyl butyral hydrogel as a thermochromic interlayer for energy-saving windows

Engineering a polyvinyl butyral hydrogel as a thermochromic interlayer for energy-saving windows

Dynamically Tunable Thermochromic Smart Windows for Building Energy Conservation

Flexible and Stretchable Thermoresponsive Display for Multifunctional Device Applications

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