用于自适应调温辐射制冷智能窗户的双温度响应深共晶溶剂离子凝胶

Dual Temperature Responsive Deep Eutectic Solvent Ionogel for Adaptive Thermoregulated Radiant Cooling Smart Windows

构建具有自适应辐射制冷性能的双温度响应智能窗户以实现节能和隐私保护被认为具有很大的研究价值。我们提出了一种基于聚乙二醇基可聚合深共晶溶剂(PEG-PDES)聚合而成的双温度响应深共晶溶剂离子凝胶(DDESI),并应用于智能窗户。离子凝胶通过控制温度从低温(<20℃)到室温(20~40℃)再到高温(>40℃),实现了三阶段光学调制(不透明-透明-不透明),以实现节能和客户隐私保护的作用。它展示了具有竞争力的太阳能调制能力(ΔT_(sol)=80.69%)和透光率(T_(lum)=85.85%),以及可调节的低、高两个响应温度(T_(1)、T_(2))。该体系的T_(2)可以在较宽的温度范围内(40~70℃)实现透明-白色可逆的温度调节。同时,DDESI在中红外范围表现极高的发射率(>90%),且在高温下在太阳辐射范围极低的透过率(≈0%),使离子凝胶具有日间辐射效果并进一步提升热管理性能,在实践测试中能达到最高8℃降温作用。这项工作制备的自适应辐射制冷双温度响应深共晶溶剂离子凝胶为发展多功能智能窗户提供了新思路。

The construction of dual-temperature responsive smart windows with adaptive radiation cooling performance for energy saving and privacy protection is considered to be of great research value.We propose a dual temperature responsive deep eutectic solvent ionogel(DDESI)based on the polymerization of polyethylene glycol-based polymerizable deep eutectic solvent(PEG-PDES)and apply it to smart windows.The ionogel achieves a three-stage optical modulation(opaque-transparent-opaque)by controlling the temperature from low temperature(<20℃)to room temperature(20~40℃)to high temperature(>40℃)for energy saving and customer privacy protection.It demonstrates competitive solar modulation(ΔT_(sol)=80.69%)and light transmission(T_(lum)=85.85%),as well as adjustable low and high two response temperatures(T_(1),T_(2)).The T_(2)of this system can be transparent-white reversible temperature regulation in a wide temperature range(40~70℃).At the same time,DDESI exhibits extremely high emissivity(>90%)in the mid-infrared range and very low transmittance(≈0%)in the solar radiation range at high temperatures,giving the ionogel a daytime radiative effect and further enhancing the thermal management performance,which can achieve up to 8℃cooling effect in practical tests.The adaptive radiative cooling dual temperature response deep eutectic solvent ionogel prepared in this work provides new ideas for the development of multifunctional smart windows.