MXene aerogel/epoxy resin electromagnetic-shielding nano composite and preparation method thereof
A nano-composite material and epoxy resin technology, applied in the field of nano-composite materials, can solve the problems of reduced mechanical strength, weak electromagnetic shielding performance, difficult processing of composite materials, etc., and achieves simple preparation method, high electrical conductivity, and high shielding effectiveness. Effect
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[0036] In the present invention, the preparation method of the MXene airgel comprises the following steps: mixing f-MXene and an aqueous solution of cellulose nanofibers, performing directional freezing, freeze drying and annealing in sequence to obtain the MXene airgel.
[0037] In the present invention, the f-MXene is preferably prepared by an ion exchange method, specifically, the following steps are included: ultrasonically mixing HCl solution and LiF, adding Ti 3 AlC 2 Perform etching reaction to obtain multi-layer MXene; mix the multi-layer MXene with water and perform centrifugation to obtain a supernatant, then perform ultrasonication on the supernatant to separate solid and liquid, and freeze-dry the obtained liquid material get f-MXene. In the present invention, the reaction that occurs during the preparation of f-MXene is Ti 3 AlC 2 Al in was etched by HCl to form a multilayer MXene with an organ-like structure, and then due to the Li + The intercalation and ult...
Embodiment 1
[0051] (1) Provide f-MXene: Add HCl solution (9mol / L, 40mL) and LiF (3.6g) into a 50mL tetrafluoroethylene beaker for ultrasonic mixing for 20min, and add slowly at a rate of 0.5g / min in an ice bath Ti 3 AlC 2 (2g), reacted at 35°C for 24h, centrifuged at 3500rpm for 10min, washed with deionized water until the pH of the solution was neutral, and obtained multilayer MXene; mixed multilayer MXene with 100mL deionized water, Centrifuge under the condition of 10min, take the supernatant and carry out ultrasonication (300W, 10min) with a cell pulverizer under the condition of argon and ice bath, peel off the multi-layer MXene, centrifuge the obtained system under the condition of 4500rpm for 30min, filter the obtained liquid material, Freeze-drying at -30°C for 60 hours to obtain f-MXene;
[0052] (2) Disperse 0.5g f-MXene in an aqueous solution (0.2wt%) of 10g cellulose nanofibers, stir for 2h under the protection of argon, and carry out liquid nitrogen directional freezing tre...
Embodiment 2
[0055] (1) Provide f-MXene: Add HCl solution (2mol / L, 30mL) and LiF (3g) into a 50mL tetrafluoroethylene beaker for ultrasonic mixing for 20min, and slowly add Ti at a rate of 0.5g / min in an ice bath 3 AlC 2 (4g), reacted at 35°C for 72h, centrifuged at 3500rpm for 10min, washed with deionized water until the pH of the solution was neutral, and obtained multilayer MXene; mixed multilayer MXene with 100mL deionized water, Centrifuge for 5 minutes under the condition, take the supernatant and carry out ultrasonication (300W, 30min) with a cell pulverizer under the condition of argon and ice bath, peel off the multi-layer MXene, centrifuge the obtained system under the condition of 5500rpm for 60min, filter the obtained liquid material, Freeze-drying at -50°C for 60 hours to obtain f-MXene;
[0056] (2) Disperse 0.2g f-MXene in 10g cellulose nanofiber aqueous solution (0.2wt%) and stir for 2h under the protection of argon, and carry out liquid nitrogen directional freezing treat...
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