Preparation method of difunctional magnetic fluorescent nanocomposite Fe3O4@CDs microspheres
A fluorescent nano and dual-functional technology, applied in the direction of magnetic materials, magnetic objects, nanotechnology, etc., can solve the problems of low chemical stability, potential toxicity, and narrow suitable range of quantum dots, and achieve less restrictions on reaction conditions and stability Good performance and good water solubility
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[0023] Example 1
[0024] 1. Fe 3 O 4 Preparation:
[0025] Weigh 0.2g of ferric chloride hexahydrate (FeCl 3 ﹒ 6H 2 O), add 15mL deionized water to dissolve, then add 0.5g monohydrate citric acid, 3mL ethylenediamine, 0.3g sodium hydroxide. After stirring uniformly, it was transferred to a 50mL reactor and reacted at 200°C for 12 hours. The black solution was magnetically separated and washed several times with ethanol and deionized water to remove residual reactants, and dried in vacuum at 60°C for 6 hours.
[0026] 2. Fe 3 O 4 @SiO 2 -NH 2 Preparation:
[0027] 0.1g Fe 3 O 4 Disperse in 100mL ethanol solution (ethanol / water = 1 / 4, V; V), add 1.5mL ammonia water, ultrasonic for 15min to make it uniformly dispersed in the solution, then slowly add 1mL ethyl orthosilicate under mechanical stirring, After reacting for 45 minutes, 0.07mL 2-(aminoethyl)propyltrimethylsilane was added dropwise, and stirring was continued for 4h at room temperature. The synthesized Fe 3 O 4 @SiO 2 -NH 2...
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[0031] Example 2
[0032] 1. Fe 3 O 4 Preparation:
[0033] Weigh 0.3g of ferric chloride hexahydrate (FeCl 3 ﹒ 6H 2 O), add 10mL deionized water to dissolve, then add 0.6g monohydrate citric acid, 2mL ethylenediamine, 0.4g sodium hydroxide. After stirring uniformly, it was transferred to a 50mL reactor and reacted at 200°C for 8 hours. The black solution was magnetically separated and washed several times with ethanol and deionized water to remove residual reactants, and dried in vacuum at 60°C for 6 hours.
[0034] 2. Fe 3 O 4 @SiO 2 -NH 2 Preparation:
[0035] 0.1gFe 3 O 4 Disperse in 100mL ethanol solution (ethanol / water=10 / 3, V; V), add 1.5mL ammonia water, ultrasonic for 15-30min, make it uniformly dispersed in the solution, then slowly add 1mL ethyl orthosilicate under mechanical stirring After reacting for 45-60min, add 0.07mL 2-(aminoethyl)propyltrimethylsilane dropwise, and continue to stir at room temperature for 4-6h, the synthesized Fe 3 O 4 @SiO 2 -NH 2 After the nano...
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[0039] Example 3
[0040] 1. Fe 3 O 4 Preparation:
[0041] Weigh 0.2g of ferric chloride hexahydrate (FeCl 3 ﹒ 6H 2 O), add 15mL deionized water to dissolve, then add 0.5g monohydrate citric acid, 3mL ethylenediamine, 0.3g sodium hydroxide. After stirring uniformly, it was transferred to a 50mL reactor and reacted at 200°C for 12 hours. The black solution was magnetically separated and washed several times with ethanol and deionized water to remove residual reactants, and dried in vacuum at 60°C for 6 hours.
[0042] 2. Fe 3 O 4 @SiO 2 -NH 2 Preparation:
[0043] 0.16g Fe 3 O 4 Disperse in 130mL ethanol solution (ethanol / water=10 / 3, V; V), add 2mL ammonia water, ultrasonic for 30min to make it uniformly dispersed in the solution, and then slowly add 2mL ethyl orthosilicate under mechanical stirring to react After 60min, add 0.66mL 3-aminopropyltriethoxysilane dropwise, continue to stir at room temperature for 6h, the synthesized Fe 3 O 4 @SiO 2 -NH 2 After the nanoparticles were m...
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