AI Article Synopsis
- Traditional smart windows use electrical signals to change transparency, but this limits their applications.
- A new transparent composite film made from PVA--PE/CA can change transparency when exposed to humidity, showing high optical transparency (96.61%) and great strength.
- This composite film can be easily applied to surfaces for use in smart windows or visualization devices, with potential applications in information encryption and smart home technology.
Article Abstract
Traditional smart windows use electrical signals to transform transparency. However, this electric transmission mode greatly limits their uses. Here, we have prepared a transparent PVA--PE/CA composite film, which can realize the reversible transformation of transparency under the stimulation of humidity. The preparation method of the composite film included simple immersion and a thermal curing process, showing high optical transparency (96.61%) and an excellent tensile strain at break of 536.34%. Once exposed to moisture stimulation, the rapid hygroscopic swelling of the composite film led to the increase in the difference in the refractive index between the citric acid filling phase and the nanofibers, which directly led to the sharp decrease in the composite film's transparency. Moreover, the composite film can be arbitrarily attached to the surface of the transparent substrate and designed as some special visualization devices or smart windows, which have a promising future in information encryption and intelligent homes.
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| http://dx.doi.org/10.1021/acs.jpclett.1c02772 | DOI Listing |
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