Solid Fe3O4@C superstructure microsphere wave-absorbing material and preparation method and application thereof
A wave-absorbing material and superstructure technology, applied in the direction of microsphere preparation, microcapsule preparation, chemical instruments and methods, etc., can solve the problems of narrow effective frequency bandwidth, etc., achieve wide effective absorption frequency bandwidth, low energy consumption, increase medium The effect of power loss capability
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Embodiment 1
[0055] Fe 3 o 4 Preparation of nanoparticles:
[0056] (1) ferric salt (FeCl 3 ·6H 2 O, 10g) and sodium oleate (C 18 h 33 NaO 2 ) was added to the mixed solvent according to the mass ratio of 1:4 (deionized water: ethanol: n-hexane volume ratio = 1:1:2) (H 2 (2 volume is 60mL), heated to reflux at 70° C. for 4 hours, and naturally cooled to room temperature after the end of the experiment; the obtained product was extracted and washed 3 times with deionized water;
[0057] (2) The product (iron oleate) obtained in (1) was vacuum-dried at 60° C.; according to the mass ratio of iron oleate (4.5 g): oleic acid = 4:1, the volume of octadecene was 50 mL, The mixture was stirred, protected by an inert atmosphere, and reacted at 320°C for 1 hour, and naturally cooled to room temperature after the reaction; the obtained product was dispersed in a mixed solvent (volume ratio of n-hexane:ethanol:isopropanol=1:1:3, n-hexane volume 30mL) for centrifugal washing;
[0058] (3) Fe o...
Embodiment 2
[0061] Fe 3 o 4 Nanoparticles self-assemble into ultrastructured microspheres:
[0062] (1) The quality of dodecyltrimethylammonium bromide is 15g, which is dissolved in 150mL deionized water; then Fe in Example 1 is added 3 o 4 The n-hexane solution of nanoparticles was 15 mL, and the obtained mixed solution was homogeneously stirred at a speed of 8000 rpm for 25 min;
[0063] (2) The product obtained in step (1) was heated at 50°C, stirred, and purged with an inert atmosphere for 2 hours; then magnetically separated, washed several times, and redispersed into an ethanol solution for storage to obtain the product. (The purpose of dispersing in the ethanol solution is to store the product obtained in a small amount, and the concentration will not affect the further processing of the subsequent product).
[0064] The Fe obtained in this example 3 o 4 TEM images of self-assembled superstructured microspheres image 3 As shown, the superstructured microspheres present a lo...
Embodiment 3
[0066] Regulating ligand carbonization temperature to obtain Fe 3 o 4 @C superstructure microspheres:
[0067] The Fe obtained in Example 2 3 o 4 The superstructure microspheres (volatilized ethanol solvent) were placed in a tube furnace, protected by an inert atmosphere; the heating rate was 5°C / min, the carbonization temperature was 500°C, and the carbonization time was 2h. After the reaction was completed, it was naturally cooled to room temperature.
[0068] The Fe obtained in this example 3 o 4 SEM images of @C superstructured microspheres figure 1 It can be seen that the carbonization heat treatment of the ligands will not change the original superstructure morphology, but can still maintain the long-range ordered periodic arrangement structure.
[0069] Fe 3 o 4 Crystal phase characterization of @C superstructure microspheres:
[0070] The Fe obtained in this embodiment 3 o 4 XRD characterization of @C superstructured microspheres, such as Figure 4 shown w...
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