A kind of graphene synergistic thermal energy storage composite material and its preparation method and application
A composite material and graphene technology, applied in the field of graphene-enhanced heat storage energy composite material and its preparation, can solve the problems of limited application, slow heat release rate, etc., and achieve the effect of fast heat release rate and excellent energy storage density
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Embodiment 1
[0066] 1) Preparation of azobenzene: Weigh 2mmol of 3-amino-5-fluorobenzoic acid into a beaker containing 6ml of deionized water and mix with 2ml of 70mg / mL NaNO 2 After the aqueous solution is mixed, it is slowly added dropwise to 20ml of 0.5mol·L -1 HCl solution, the three were stirred evenly, and then reacted and stirred for 1 hour under ice bath conditions to obtain a diazonium salt solution. Then the resulting diazonium salt solution was slowly added dropwise to 10ml of an aqueous solution containing 0.306g of 3,5-dimethoxyaniline, followed by 5% Na 2 CO 3 Adjust the pH of the aqueous solution to 5, and continue to stir in an ice bath for 1 hour under a nitrogen atmosphere. After the reaction, it was left to stand and filtered under reduced pressure to obtain a precipitate, and a crude azobenzene was obtained. After the crude product is purified by recrystallization, the azobenzene product of the structure shown in formula (I) is obtained.
[0067] 2) Preparation of re...
Embodiment 2
[0070] 1) Preparation of azobenzene: Weigh 8 mmol of 3-amino-5-fluorobenzoic acid into a beaker containing 24 ml of deionized water and mix with 9.6 ml of 70 mg·mL -1 NaNO 2 After the aqueous solution is mixed, it is slowly added dropwise to 96ml of 0.5mol·L -1 HCl solution, the three were stirred evenly, and then reacted and stirred for 1 hour under ice bath conditions to obtain a diazonium salt solution. Then slowly add the obtained diazonium salt solution dropwise into 40ml of an aqueous solution containing 1.224g of 3,5-dimethoxyaniline, and then use 10% Na 2 CO 3 The pH of the aqueous solution was adjusted to 5.5, and the mixture was stirred in an ice bath for 2 hours under a nitrogen atmosphere. After the reaction was completed, it was left to stand and filtered under reduced pressure to obtain a precipitate, and a crude azobenzene was obtained. The crude product was purified by recrystallization to obtain the final azobenzene.
[0071] 2) Preparation of reduced grap...
Embodiment 3
[0074] 1) Preparation of azobenzene: Weigh 10 mmol of 3-amino-5-fluorobenzoic acid into a beaker filled with 30 ml of deionized water and mix with 13 ml of 70 mg·mL -1 NaNO 2 After mixing the aqueous solution, slowly add it dropwise to 160ml 0.5mol·L -1 HCl solution, the three were stirred evenly, and then reacted and stirred for 1 hour under ice bath conditions to obtain a diazonium salt solution. Then the resulting diazonium salt solution was slowly added dropwise into 50ml of an aqueous solution containing 1.53g of 3,5-dimethoxyaniline, followed by a 7% mass fraction of Na 2 CO 3The pH of the aqueous solution was adjusted to 6, and the mixture was stirred in an ice bath for 3 hours under a nitrogen atmosphere. After the reaction was completed, it was left to stand and filtered under reduced pressure to obtain a precipitate, and a crude azobenzene was obtained. The crude product was purified by recrystallization to obtain the final azobenzene.
[0075] 2) Preparation of ...
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