A nanocellulose-based electrochromic composite material and device preparation method
An electrochromic device and nanocellulose technology, applied in the direction of color-changing fluorescent materials, chemical instruments and methods, etc., can solve the problems of long preparation process and low production efficiency, and achieve reduced fiber damage, short response time, and high productivity high effect
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Embodiment 1
[0016] Embodiment 1: nanocellulose / polyaniline composite material
[0017] Add 2 g of cellulose pulp into a three-neck flask, then put it into a water bath at 40° C., and add 17 mL of sulfuric acid with a mass fraction of 64 wt % while stirring for acid hydrolysis. After 20 minutes, take it out and add 200 mL of deionized water to dilute to terminate the reaction, filter with Buchner funnel and wash twice with deionized water. Take it out when suction filtration becomes difficult, and centrifuge and wash the dispersion several times until neutral. Finally, the colloidal acid-treated cellulose after centrifugation was taken out, diluted with 150 mL of deionized water, and subjected to high-intensity ultrasonic treatment with an ultrasonic cell pulverizer for 30 minutes, with an ultrasonic power of 1000w. Ultrasound and then suction filtration again to remove larger particles and impurities in the liquid, and finally obtain a nanocellulose suspension with better transparency, u...
Embodiment 2
[0021] Embodiment 2: nanocellulose / poly 3,4-ethylenedioxythiophene composite material
[0022] First prepare nanocellulose according to the method in Example 1, then use 0.25g of 37% concentrated hydrochloric acid as a doping agent, add a certain concentration of nanocellulose suspension together with 0.4g monomer 3,4-ethylenedioxythiophene , magnetically stirred for 10 minutes. Dissolve 1.46g of ammonium persulfate in a certain amount of deionized water, fully dissolve and add to the stirred nanocellulose suspension. Control the amount of suspension and deionized water to ensure that the final total liquid is about 60g. It was then stirred at room temperature for 48 hours. After the reaction was completed, the product was centrifuged in a centrifuge at a speed of 4000r / min for 5 minutes, and the supernatant was removed to retain the lower blue-black precipitate. According to this method, deionized water and ethanol are used to centrifuge and wash twice to remove residual m...
Embodiment 3
[0024] Embodiment 3: nanocellulose / polypyrrole composite material
[0025] Firstly, nanocellulose was prepared according to the method in Example 1, and 0.97 g of pyrrole monomer was added to a certain concentration of nanocellulose suspension and fully stirred for 10 minutes. After the two are mixed evenly, add 50 mL of ferric chloride aqueous solution with a concentration of 0.14 mol / L to the system drop by drop with a constant pressure funnel, and finish dropping within 30 minutes. Placed in an ice-water bath and stirred for 24 hours to obtain a black liquid. The product was suction-filtered and washed repeatedly with methanol and deionized water until the filtrate was colorless, and then vacuum-dried at 60° C. for 12 hours to obtain a nanocellulose / polypyrrole composite suspension.
[0026] The nanocellulose / polypyrrole suspension was drop-coated on the washed FTO glass, and dried naturally at room temperature to obtain a nanocellulose / polypyrrole composite film. Acetonitr...
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