Smart window using aerogel
An aerogel, window technology, used in windows/doors, door/window protection devices, buildings, etc., can solve problems such as insufficient interface, low shading rate, and increased driving voltage
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Embodiment 1
[0064] Example 1: Fabrication of smart windows containing silica airgel
[0065] (a) 3 ml of TMOS, 0.73 ml of 0.069 mol % ammonia water and 1.8 ml of methane were mixed to prepare a mixed solution.
[0066] (b) Spin coating the mixed solution on the transparent electrode.
[0067] (c) The transparent electrode coated with the mixed solution was dried in an alcohol atmosphere for 10 hours to gel the mixed solution.
[0068] (d) Another pair of transparent electrodes was bonded to the upper side of the gelled silica airgel, and liquid crystal was injected into the silica airgel by capillary force to fabricate a smart window sample.
Embodiment 2
[0069] Example 2: Manufacture of smart windows containing Si-Ti hybrid aerogels
[0070] (a) Mix 1.23ml of 0.55MTEOS, 0.565ml of 0.3MMe-TES, 0.28ml of 0.4M isopropanol and 0.146ml of 0.343M nitric acid to prepare A solution.
[0071] (b) 2.91 ml of 1M acetylacetone and 1.04 ml of 1M titanium acetylacetonate were mixed to prepare a B solution.
[0072] (c) Solution A and solution B were mixed and reacted for 2 hours.
[0073] (d) The mixed solution of step (c) was stirred for 15 min, and then spin-coated on the transparent electrode.
[0074] (e) The transparent electrode coated with the mixed solution was dried in an airtight container under an alcohol atmosphere for 4 days, dried in air for 2 days, and then heated at 50° C. for 10 hours.
[0075] (f) Another pair of transparent electrodes was bonded to the upper side of the Si-Ti hybrid aerogel, and the liquid crystal was injected into the Si-Ti hybrid aerogel by capillary force to fabricate a smart window sample.
[0076]...
Embodiment 3
[0083] Measurement Example 3: Surface Analysis of Smart Window Containing Si-Ti Hybrid Airgel
[0084] Figure 6 It is a picture of a smart window containing Si-Ti hybrid airgel fabricated in Example 2, in which light is scattered at the interface of liquid crystal and airgel in the OFF state where no voltage is applied to the transparent electrode, thereby maintaining the opaque state . Furthermore, it was confirmed that smart windows using aerogels could realize clear and high-quality smart windows due to their lower haze value compared with conventional PDLC.
[0085] Figure 7 To show a picture magnified 200 times of liquid crystal droplets filled in the pores of the Si-Ti hybrid airgel, the size of the liquid crystal droplets is about 10 μm. Such as Figure 7 As shown in , it can be found that by injecting liquid crystals into aerogels, liquid crystals can form stable sizes, shapes, and alignments.
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