Application of New Energy Thermochromic Composite Thermosensitive Materials of Smart Windows in Recent Years

Abstract

Thermochromic smart windows technology can intelligently regulate indoor solar radiation by changing indoor light transmittance in response to thermal stimulation, thus reducing energy consumption of the building. In recent years, with the development of new energy-saving materials and the combination with practical technology, energy-saving smart windows technology has received more and more attention from scientific research. Based on the summary of thermochromic smart windows by Yi Long research groups, this review described the applications of thermal responsive organic materials in smart windows, including poly(N-isopropylacrylamide) (PNIPAm) hydrogels, hydroxypropyl cellulose (HPC) hydrogels, ionic liquids and liquid crystals. Besides, the mechanism of various organic materials and the properties of functional materials were also introduced. Finally, opportunities and challenges relating to thermochromic smart windows and prospects for future development are discussed.

Thermochromic Energy Efficient Windows: Fundamentals, Recent Advances, and Perspectives

“…The same linear relationship between reflectance/absorbance/transmittance and the Br content was also obtained (Figure c). Other researchers ,− also reported the anion exchange process in CsPbX 3 and their structural and optical property tuning (Figure d,e). Additionally, cation exchange, such as 2-chloroethylammonium (CAE) replacing 2-bromoethylammonium (BEA) from (BEA) 2 CuCl 4 to (CEA) 2 CuCl 4 , also benefits the modification of optical properties (Figure ).…”

Recent Advances in Poly(N‐isopropylacrylamide) Hydrogels and Derivatives as Promising Materials for Biomedical and Engineering Emerging Applications

“…Among them, 58% were devoted to drug delivery and injectables, [ 21–23 ] 16 % was specifically related to gene and cancer therapy, [ 24,25 ] 14% to tissue engineering, [ 26–28 ] 4% to wound healing (dressing), [ 29,30 ] 4% to the antimicrobial system [ 31,32 ] and the rest appeals to other specific functions. [ 33 ] Only five revision articles were inquired into other areas, such as agricultural [ 34 ] and soft‐robotics. [ 35,36 ] The present work differs from those previously published on the topic, being set on the novelty of exploring new horizons, with a particular focus on PNIPAAm (and derivatives) TSHs uses.…”

Thermochromic hydrogels with an adjustable critical response temperature for temperature monitoring and smart windows

“…Phase change materials are classic smart window substrates that have been widely studied for thermochromic smart windows, such as vanadium oxide (VO 2 , T k E 68 1C), hydroxypropyl cellulose (HPC, T k E 50 1C), and poly (N-isopropyl acrylamide) (PNIPAM, T k E 32.5 1C) etc. 10,[13][14][15][16] When the ambient temperature reaches the T k , these materials can achieve a reversible ''transparent-opaque'' transition. However, the T k of most conventional thermochromic materials is higher than the comfortable temperature of the human body, and it is difficult to freely adjust.…”