Preparation and application method of bell-shaped absorbing material with controllable performance
A technology of wave-absorbing materials and application methods, which is applied in the field of preparation of rattle-shaped wave-absorbing materials, can solve problems such as large conductive loss, weakened wave-absorbing performance, and poor temperature stability, so as to ensure performance stability and enhance wave-absorbing performance , the effect of mild preparation conditions
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Embodiment 1
[0031] (1) Preparation of Co by liquid phase reduction method 57 Cu 43 Alloy microspheres: weigh CoCl with a molar ratio of 57:43 2 ·6H 2 O and Cu(NO 3 ) 2 ·3H 2 O solid particles, then added to 30mL of NaOH (7M) solution, stirred and mixed evenly. Add 0.15mL of ethylenediamine and 0.15g of urea, continue stirring for 5min, then add 0.15g of urea, and react the resulting mixture at 70°C for 10h to obtain Co 57 Cu 43 alloy microspheres.
[0032] (2) Preparation of Co 57 Cu 43 @PAA Composite Microspheres: Weigh 80mg Co 57 Cu 43 Solid powder, ultrasonically dispersed in 20mL deionized aqueous solution, then added 0.8mL polyacrylic acid (PAA) with a mass concentration of 0.2g / mL and 0.2mL NH 3 ·H 2 O(2moL L -1 ), wherein the molecular weight of polyacrylic acid is 1500, and the stirring is continued for 30min. Add 40 mL of isopropanol solution dropwise. After the reaction is complete, magnetically separate the obtained solid particles, wash with deionized water and et...
Embodiment 2
[0039] (1) Preparation of Co by liquid phase reduction method 23 Cu 77 Alloy microspheres: weigh CoSO with a molar ratio of 23:77 4 ·7H 2 O and CuSO 4 ·5H 2 O solid particles, then added to 30mL of NaOH (7M) solution, stirred and mixed evenly. Add 0.15mL of ethylenediamine and 0.15g of urea, continue to stir for 5min, then add 0.15g of urea, and react the resulting mixture at 70°C for 6h to obtain Co 23 Cu 77 alloy microspheres.
[0040] (2) Preparation of Co 23 Cu 77 @PAA Composite Microspheres: Weigh 40mg Co 23 Cu 77 Solid powder, ultrasonically dispersed in 20mL deionized aqueous solution, then added 0.2mL polyacrylic acid (PAA) with a mass concentration of 0.2g / mL and 0.2mL NH 3 ·H 2 O(2moL L -1 ), wherein the molecular weight of polyacrylic acid is 2000, and the stirring is continued for 30min. Add 40 mL of isopropanol solution dropwise. After the reaction is complete, magnetically separate the obtained solid particles, wash with deionized water and ethanol ...
Embodiment 3
[0045] (1) Preparation of Co by liquid phase reduction method 39 Cu 61 Alloy microspheres: Weigh Co(NO 3 ) 2 ·6H 2 O and CuCl 2 2H 2 O solid particles, then added to 30mL of NaOH (7M) solution, stirred and mixed evenly. Add 0.15mL of ethylenediamine and 0.15g of urea, continue to stir for 5min, then add 0.15g of urea, and react the resulting mixture at 70°C for 8h to obtain Co 39 Cu 61 alloy microspheres;
[0046] (2) Preparation of Co 39 Cu 61 @PAA Composite Microspheres: Weigh 100mg Co 23 Cu 77 Solid powder, ultrasonically dispersed in 20mL deionized aqueous solution, then added 0.4mL polyacrylic acid (PAA) with a mass concentration of 0.2g / mL and 0.2mL NH 3 ·H 2 O(2moLL -1 ), wherein the molecular weight of polyacrylic acid is 1800, and the stirring is continued for 30min. Add 40 mL of isopropanol solution dropwise. After the reaction is complete, magnetically separate the obtained solid particles, wash with deionized water and ethanol three times respectivel...
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