A composite thin film with both light-to-heat conversion and thermal energy storage and release functions and its preparation method
A composite thin film and light-to-heat conversion technology, which is applied in the direction of heat exchange materials, chemical instruments and methods, can solve the problems of easy leakage, low light-to-heat conversion efficiency, high packaging requirements, etc., to prevent leakage and aging, light-to-heat conversion Effects of low efficiency and small temperature range
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Embodiment 1
[0034] In this embodiment, the composite film with both photothermal conversion and thermal energy storage and release functions uses polyvinyl alcohol as the main material of the film, nano-gold particles as the photothermal conversion material, self-assembled and filled with organic phase change material and evaporated water. obtained from a solvent, wherein the solid content of the organic phase change material PEG2000 is 5%.
[0035] In this example, the composite film with the functions of light-to-heat conversion and thermal energy storage and release is prepared according to the following method:
[0036] a. Preparation of gold nanoparticles
[0037] Add 1.25mL of 0.1M chloroauric acid aqueous solution into 50mL of ultrapure water, stir and heat to boiling, then add 750μL of 10% trisodium citrate aqueous solution, continue to reflux at 95°C for 0.5 hours, stop Stir and cool to room temperature to obtain a gold nanoparticle solution, which is stored in a refrigerator at 4...
Embodiment 2
[0047] The preparation method of the composite film of this embodiment is the same as that of Example 1, the amount of the added nano-gold particle solution is 10mL, the difference is that the added organic phase change material is 3.33mL of PEG2000 aqueous solution with a mass fraction of 20%. The solid content of PEG2000 in the obtained film was 40%.
[0048] After testing, when PEG2000 is used as the organic phase change material in Examples 1 and 2, the phase transition temperature of the obtained composite film is about 51-55°C.
[0049] Figure 4 It is an optical photo of the composite film prepared in this embodiment to prevent leakage. The upper figure is the original PEG2000 material, and the lower figure is the composite phase change energy storage material (PEG / PVA / Au) prepared in this embodiment. It can be seen from the figure , when the temperature of the hot stage gradually increased from 20°C to 80°C, the original PEG2000 material gradually melted and leaked, t...
Embodiment 3
[0053] The preparation method of this example is the same as that of Example 1, the amount of the added nano-gold particle solution is 10mL, the difference is that the organic phase change material is PEG1000, the added amount is 2.63mL of PEG1000 aqueous solution with a mass fraction of 2%, and the mass fraction is 5.55mL of 2% PEG1000 aqueous solution, 1.25mL of 20% PEG1000 aqueous solution by mass fraction, 3.33mL of 20% PEG1000 aqueous solution by mass fraction, the solid content of PEG1000 in the obtained composite phase change material is 5%, 10%, 20% respectively and 40%. After testing, when PEG1000 is used as the organic phase change material in this embodiment, the phase transition temperature of the obtained composite film is about 35-40°C.
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