Strawberry-shaped magnetic composite nanoparticles and preparation method of multi-layer core-shell magnetic composite nanoparticles
A technology of magnetic composite nanometer and multilayer core-shell structure, which is applied in the field of preparation of strawberry-shaped magnetic composite nanoparticle and multilayer core-shell structure magnetic composite nanoparticle, can solve the problems of magnetic composite particles that have not been reported yet, and achieve small size, Good magnetic field responsiveness
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[0032] A method for preparing magnetic composite nanoparticles with a strawberry-like structure and a multilayer core-shell structure, characterized in that the steps are as follows:
[0033] Step 1: Choose any polymerization method to prepare polymer nanoparticles, put monomers, crosslinking agents, initiators, solvents, and surfactants in a flask, stir and disperse evenly, and set the temperature at 25-150°C for reaction Lasts 1 to 24 hours. The product is fully washed to remove unreacted monomers, cross-linking agents and solvents, and dried for later use. The mass ratio of monomer, crosslinking agent, initiator, solvent and surfactant is 10-100:0-15:0.01-15:0-200:0-15;
[0034] Step 2: Use the polymer nanoparticles prepared in step 1 as seeds, and ultrasonically mix them with the iron source used to generate ferroferric oxide magnetic nanoparticles in a solvent, place them in a flask for stirring, pass in an inert gas, and then put the system Raise the temperature to 30-...
Embodiment 1
[0050] Embodiment 1: 10g glycidyl methacrylate, 1g divinylbenzene and 0.05g potassium persulfate are placed in a three-necked flask with 100g water and stirred, and polymethyl methacrylate is prepared by soap-free emulsion polymerization matter nanoparticles. The temperature was set at 105°C, and the reaction was performed for 2 hours. The polymer particles were washed several times with pure water and freeze-dried for later use. Take 2g of polymethyl methacrylate polymer nanoparticles and disperse them in 20g of benzyl alcohol, add 2g of ferric chloride, mix evenly by ultrasonic, place in a three-necked flask for stirring, feed in nitrogen, raise the temperature to 50°C, keep it for 10min, and Continue to heat up to 150°C at a rate of 20°C / min and keep for 10 minutes. The system was allowed to cool to 25° C., and washed 3 times with methanol to obtain strawberry-shaped magnetic composite nanoparticles.
Embodiment 2
[0051] Example 2: 10 g of methacrylic acid, 10 g of divinylbenzene and 0.05 g of potassium persulfate were placed in a three-necked flask filled with 200 g of water for stirring, and polymethacrylic acid nanoparticles were prepared by soap-free emulsion polymerization. The temperature was set at 80°C, and the reaction was carried out for 8 hours. The polymer particles were washed several times with pure water and freeze-dried for later use. Take 1g of polymethacrylic acid nanoparticles and disperse them in 40g of ethylene glycol, add 2g of ferric chloride, mix evenly by ultrasonic, place in a three-necked flask for stirring, pass in nitrogen gas, raise the temperature to 100°C, keep it for 10min, and set the temperature at 20°C / Continue to heat up to 200°C at a rate of min and keep for 30 min. Let the system cool to 25° C., wash with methanol three times, and obtain strawberry-shaped magnetic composite nanoparticles.
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