Non-magnetic ZnO/C composite wave-absorbing material and preparation method thereof
A composite absorbing material, non-magnetic technology, applied in carbon preparation/purification, magnetic/electric field shielding, zinc oxide/zinc hydroxide, etc., can solve the problem of lack of magnetic loss capability, difficulty in balancing impedance matching and attenuation characteristics, The problem of obtaining microwave absorption performance, etc., achieves the effects of good microwave absorption performance, low cost, and simple preparation method
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Embodiment 1
[0060] A kind of nonmagnetic ZnO / C composite absorbing material, its preparation method comprises the following steps:
[0061] 1) Weigh 6.5853g Zn(Ac) 2 2H 2 Dissolve O in 300mL diethylene glycol, stir magnetically until zinc acetate dihydrate is completely dissolved; transfer to a 500mL three-neck flask, then transfer to an oil bath, heat to 160°C under magnetic stirring, and continue at 160°C React for 2 hours; wait for the reaction liquid to cool naturally to room temperature; use a centrifuge to separate the solid from the liquid (rotational speed is 8500r / min, time is 5min); the separated solid is cleaned with absolute ethanol, and the separation of the solid during cleaning is centrifugation , washed 3 times in total; drying the washed solid matter at 70°C to obtain spherical ZnO;
[0062] 2) Add 0.64 g of spherical ZnO obtained in step 1) into 32 mL of absolute ethanol, perform magnetic stirring for 10 min, and ultrasonic treatment for 20 min to obtain dispersion A; ...
Embodiment 2
[0071] A kind of nonmagnetic ZnO / C composite absorbing material, its preparation method comprises the following steps:
[0072] 1) adopt the method described in embodiment 1 step 1) to prepare spherical ZnO;
[0073] 2) Add 0.64 g of spherical ZnO obtained in step 1) into 32 mL of absolute ethanol, stir magnetically for 10 min, and sonicate for 20 min to obtain dispersion A;
[0074] Add 6.4g of 2-methylimidazole to 128mL of absolute ethanol, stir for 10min to completely dissolve 2-methylimidazole, and obtain solution B;
[0075] Add solution B to dispersion A, heat to 50°C under magnetic stirring, and keep warm at 50°C for 2 hours; wait for the reaction liquid to cool down to room temperature naturally, use a centrifuge to separate the solid from the liquid (rotating speed is 8500r / min , the time is 5min); the separated solid matter was washed with absolute ethanol, and the solid matter separated during cleaning was centrifuged, and the washing was performed for 3 times; the...
Embodiment 3
[0082] A kind of nonmagnetic ZnO / C composite absorbing material, its preparation method comprises the following steps:
[0083] 1) adopt the method described in embodiment 1 step 1) to prepare spherical ZnO;
[0084] 2) Add 0.64 g of spherical ZnO obtained in step 1) into 32 mL of absolute ethanol, perform magnetic stirring for 10 min, and ultrasonic treatment for 20 min to obtain dispersion A;
[0085] Add 6.4g of 2-methylimidazole into 128mL of absolute ethanol, stir for 10min to completely dissolve 2-methylimidazole, and obtain solution B;
[0086] Add solution B to dispersion A, heat to 50°C under magnetic stirring, and keep it warm at 50°C for 6 hours; wait for the reaction liquid to cool down to room temperature naturally, use a centrifuge to separate the solid from the liquid (rotating speed is 8500r / min , the time is 5min); the separated solid matter was washed with absolute ethanol, and the solid matter separated during cleaning was centrifuged, and the washing was p...
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Abstract
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