Design of VO2-based photoactuators for smart windows

Rapidly responsive liquid metal/polyimide photothermal actuators designed based on the bilayer structure difference in coefficient of thermal expansion

“…The bending angle increased approximately linearly with the increase of power, and a linear fit was performed. The LM/PI photothermal actuator responds rapidly, the LM/PI-8% photoactuator bends 60.161 in 2.75 s and the bending speed reaches 21.891 s À1 , which exceeds that of most of the reported photoactuators, [39][40][41][42][43][44][45][46][47][48][49][50][51] as shown in Fig. 5g and h.…”

Hierarchical-Morphology Metal/Polymer Heterostructure for Scalable Multimodal Thermal Management

“…Heating technologies in recent decades were developed for solar-driven heating, which is a promising alternative to energy-intensive traditional heating systems. − Generally, solar heating was mainly based on carbon materials and structural design, which could improve solar absorptance and lower the thermal emittance. ,− However, most cities need both cooling and heating throughout the whole year. ,, Therefore, residential buildings are located in highly dynamic weather and need smart thermal management for switching between cooling and heating to deal with various environmental situations. Research recently has yielded various smart thermal management designs, including porosity controlling, , thermochromic materials, , and heterostructure. , Among these, the heterostructure, which integrates passive radiative cooling technology and solar heating technology, is one of the most efficient and promising strategies. As mentioned above, the passive radiative cooling technology can lead to greater benefits in hot climates, but the energy consumption will increase in cold climates.…”

“…23,27,28 Therefore, residential buildings are located in highly dynamic weather and need smart thermal management for switching between cooling and heating to deal with various environmental situations. Research recently has yielded various smart thermal management designs, including porosity controlling, 29,30 thermochromic materials, 31,32 and heterostructure. 27,33 Among these, the heterostructure, which integrates passive radiative cooling technology and solar heating technology, is one of the most efficient and promising strategies.…”

Rolling origami of vanadium dioxide nanomembranes for enhanced multi-level solar modulation

“…This dilemma can be attributed to that the enhancement of visible transmittance of a VO 2 -based planar SW will inevitably be accompanied by the sacri ce of the infrared blocking effect at high temperatures, which leads to a reduction of ΔT sol . 1 Recently, three-dimensional (3D) thermochromic SWs have been demonstrated based on planar polymer composites including kirigami-inspired 19 and photo-triggered SWs, 20 which associate thermo-actuation with thermochromic materials to enhance both ΔT sol and T lum simultaneously. These 3D SWs improved the difference of light transmittance between triggered and low temperatures (i.e., a larger ΔT sol ) through recon gurable shapes.…”

“…However, these thermo-actuated SWs bring a problem, which is the balance of the thermal expansion temperature of applied smart polymer and the phase transition temperature of the thermochromic material (e.g., VO 2 ). 19,20 Interestingly, VO 2 itself is an excellent material for thermoactuators with high response speed, low trigger temperature, and large deformation. 21−24 Nevertheless, there are few efforts on a combination of thermo-actuation with thermochromic property due to the di culty and complexity of their synergy in on-demand shape deformation and light transmission.…”