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  聚合物分散液晶(PDLC)是一種液晶以微滴形狀分散在連續(xù)聚合物基體中的復合薄膜。在零場條件下，液晶分子無規(guī)取向，由于液晶微滴與聚合物基體之間的折射率不同，薄膜呈現不透明狀態(tài)。當施加外部電場時，液晶分子重新排列與電場力方向一致，此時聚合物與液晶微滴折射率相匹配，薄膜呈現透明狀態(tài)。與傳統的電致變色和熱致變色智能窗相比，PDLC在光學領域具有廣闊的應用前景。然而，它們的應用受到一些缺點的限制，比如高驅動電壓、低對比度和熱穩(wěn)定性差，尤其是高工作電壓，是研究人員一直在努力解決的問題。

  近日，北京科技大學楊槐/于美娜團隊等人通過將高清亮點液晶單體引入PDLC體系中，開發(fā)設計了一種可在較高溫度下仍保持著低電壓、高對比度和快速響應的PDLC薄膜。該薄膜在智能顯示領域和智能窗領域有著良好的應用前景。相關工作以“An intelligent electrochromic film with passive radiative cooling and synergistic solar light control capabilities for display and smart windows”為題發(fā)表于Journal of materials chemistry A, 北京科技大學/北京大學楊槐教授、于美娜副研究員、王茜特聘副研究員為共同通訊作者，北京科技大學新材料技術研究院博士生張作為為文章第一作者。

Figure 1. Schematic diagram of the preparing process and working mechanism of PDLC film.

Fig 3. (a-f) Reflection notch dispersion image of the five samples recorded at different temperatures, in which the transmittance is represented by the color; (g-i) (g) The V_sat; (h) CR; and (i) Response time of B3 sample at different temperatures.

Fig 4. (a-b) Patterned PDLC based on different CRs in the on and off states; (c-d) Mechanism of the image-imbedded PDLC displays with the demonstrated photo images of word “B” and “Four-leaf clover” at several driving voltages; (e) transmittance images of the film at different voltages; (f) UV-Vis-NIR spectra at different voltages (g) reflection spectra of film at off-state and on-state; (h) the response time curve (sample B3); (i) the transmittance of the spectra of the initial film and the film after 100 cycles;

Fig 5. (a) Solar transmittance and infrared emissivity curves; (b) Absorbance spectrum of PDLC film with ATR-FTIR spectroscopy; (c) the temperature variation of the films under simulated sun light; (d) Temperature of thin film under different voltages; (e) calculated net cooling power during the nighttime of PDLC film; (f) calculated net cooling power during the daytime of PDLC film; (g) variation of integral luminous transmittance in 380-780 nm (T_lum) and solar transmittance in 380-2500 nm (T_sol) under different voltages; (h) Response time and ΔT_lum of PDLC film and EC switchable materials to compare their dynamic modulation capability.

  原文鏈接：https://doi.org/10.1039/d4ta04621h