3D aerogel-based phase change composite material with infrared stealth and visible light dual camouflage functions and preparation method
A phase change composite material and composite material technology, applied in the field of MXene/reduced graphene oxide aerogel-based phase change composite material and preparation
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Embodiment 1
[0042] The first is to prepare graphene oxide. Using natural graphite as raw material, mix 2 parts natural graphite, 2 parts NaNO 3 , 60 parts H 2 SO 4 Add it to the three-necked flask, stir at 5°C for 15min; add 6 parts of KMnO under ice bath 4 , kept at 35°C for 4h; added 20 parts of deionized water, heated to 80°C for 30min; then added 8 parts of H 2 O 2 and 160 parts of deionized water, and after standing, washed and centrifuged until neutral; the obtained graphite oxide slurry was freeze-dried, re-dispersed in deionized water, and ultrasonicated for 30 minutes to obtain a graphene oxide dispersion.
[0043] The second step is to prepare MXene nanosheets. Dissolve 1.6 parts LiF in 9 mol L -1 HCl, add 1 part Ti with stirring 3 AlC 2 The powder was reacted at 35°C for 36h to obtain MXene suspension; repeatedly washed with deionized water, and centrifuged at 8000rpm for 10min until the pH value reached 6; MXene suspension was ultrasonicated for 1h under argon gas flow...
Embodiment 2
[0052] Preparation of graphene oxide is the same as in Example 1.
[0053] The preparation of MXene nanosheets is the same as in Example 1.
[0054] The third is the preparation of MXene / reduced graphene oxide composite aerogels. 10mg mL -1 MXene dispersion and 10mg mL -1 The mass ratio of GO dispersion was 2:1, and the mass ratio of GO to VC was 1:2. After mixing MXene with GO dispersion and VC, the mixture was sonicated in an ice bath for 20 min; the mixture was pre-reduced in a 70 °C oven for 1 h to obtain MXene / p-rGO hydrogel; put the glass mold containing MXene / p-rGO hydrogel on a copper column immersed in liquid nitrogen, and freeze for 30 min; Reduction for 1h; the reduced hydrogel was dialyzed in water for 12h to remove excess VC; completely frozen in liquid nitrogen, and then freeze-dried under vacuum <30Pa, -70°C for 48h to obtain composite aerogel (MG) .
[0055] The compounding of n-octadecane and aerogel and the subsequent spraying process of color-changing i...
Embodiment 3
[0059] Preparation of graphene oxide is the same as in Example 1.
[0060] The preparation of MXene nanosheets is the same as in Example 1.
[0061] The third is the preparation of MXene / reduced graphene oxide composite aerogels. 10mg mL -1 MXene dispersion and 10mg mL -1 The mass ratio of GO dispersion was 4:1, and the mass ratio of GO to VC was 1:2. After mixing MXene, GO dispersion and VC, they were sonicated in an ice bath for 20 min; the mixture was pre-reduced in a 70 °C oven for 1 h to obtain MXene / p-rGO hydrogel; put the glass mold containing MXene / p-rGO hydrogel on a copper column immersed in liquid nitrogen, and freeze for 30 min; Reduction for 1h; the reduced hydrogel was dialyzed in water for 12h to remove excess VC; completely frozen in liquid nitrogen, and then freeze-dried under vacuum <30Pa, -70°C for 48h to obtain composite aerogel (MG) .
[0062] The compounding of n-octadecane and aerogel and the subsequent spraying process of color-changing ink are the...
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