Silica-magnetic composite micropartical and its preparation method
A technology of mesoporous silica and composite particles, which is applied in the field of magnetic materials, can solve the problems of inability to achieve magnetic separation, weak magnetic response ability, and reduce the specific surface area of magnetic particles, and achieve strong external magnetic field response ability and strong anti-oxidation ability. , the effect of improving the separation ability
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Embodiment 1
[0019] Example 1: Fe 3 o 4 Preparation of nanoparticles
[0020] Weigh 13.73g of FeCl 3 ·6H 2 O and 5.1 g FeCl 2 4H 2 O, dissolved in 100mL of water that has passed through nitrogen and deoxygenated to obtain a mixed solution. Take 400mL of water in a 1L three-necked bottle to pass through nitrogen to remove oxygen, add 25mL of concentrated ammonia water with a mass percentage concentration of 25-28%, and quickly pour the above-mentioned iron salt mixed solution into it under vigorous stirring. Reaction 1h. After the reaction is completed, use a 0.2T permanent magnet to separate the black solid from the reaction solution, and wash the obtained solid with high-purity water for 3 to 5 times to obtain Fe with a particle size of 7 to 12 nm. 3 o 4 Nanoparticles.
Embodiment 2
[0021] Example 2: γ-Fe 2 o 3 Preparation of nanoparticles
[0022] Weigh 13.73g of FeCl 3 ·6H 2 O and 5.1 g FeCl 2 4H 2 O, dissolved in 100mL of water that has passed through nitrogen and deoxygenated to obtain a mixed solution. Take 400mL of water in a 1L three-necked bottle to pass through nitrogen to remove oxygen, add 25mL of concentrated ammonia water with a mass percentage concentration of 25-28%, and quickly pour the above-mentioned iron salt mixed solution into it under vigorous stirring. Reaction 1h. Oxygen was then introduced into the reaction solution for 2 h. After the reaction is completed, use a 0.2T permanent magnet to separate the red solid from the reaction solution, and wash the obtained solid with high-purity water for 3 to 5 times to obtain γ-Fe with a particle size of 7 to 12 nm. 2 o 3 Nanoparticles.
Embodiment 3
[0023] Example 3: CoFe 2 o 4 Preparation of nanoparticles
[0024] Weigh 14 g of CoCl 3 ·6H 2 O and 5.1 g FeCl 2 4H2 O, dissolved in 100mL of water that has passed through nitrogen and deoxygenated to obtain a mixed solution. Take 400mL of water in a 1L three-necked bottle to pass through nitrogen to remove oxygen, add 25mL of concentrated ammonia water with a concentration of 25-28% by mass, quickly pour the above mixed salt solution into it under vigorous stirring, and react at 50°C 1h. After the reaction is completed, use a 0.2T permanent magnet to separate the black solid from the reaction solution, and wash the obtained solid with high-purity water for 3 to 5 times to obtain CoFe with a particle size of 7 to 12 nm. 2 o 4 Nanoparticles.
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