Medical double-shell porous structure hollow nanospheres and preparation method thereof
A hollow nano-porous structure technology, applied in the field of biomedical magnetic materials, can solve unseen problems, achieve uniform size, change relaxation rate and relaxation time, and light weight
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Embodiment 1
[0049] (1) Preparation of phenolic resin microspheres. Measure 200ml of deionized water, 10ml of absolute ethanol and 1ml of ammonia water into a dry 500ml three-neck flask and mix, add 1g of resorcinol, slowly add 2ml of formaldehyde solution, and stir in an oil bath at 30°C for 10h. After the reaction, the mixed solution was transferred to a high-pressure reactor, and placed in a vacuum drying oven at 80° C. for hydrothermal reaction for 22 hours for aging. Then the solid and liquid were separated, and the solid was vacuum-dried at 80° C. for 24 hours to obtain phenolic resin (PF) microspheres with a size of about 200 nm.
[0050] (2) Preparation of rare earth ion Ce 3+ Doped Zn(Fe,Ce) 2 o 4 Ferrite precursor solution. According to Zn(Fe,Ce) 2 o 4 Molar ratio, respectively weigh appropriate amount of nitrate, including Zn(NO 3 ) 2 , Fe(NO 3 ) 3 and Ce(NO 3 ) 3 , Put the weighed several nitrates into the beaker, and add an appropriate amount of deionized water at ...
Embodiment 2
[0059] (1) Preparation of phenolic resin microspheres. Measure 300ml of deionized water, 40ml of absolute ethanol and 10ml of ammonia water into a dry 500ml three-necked flask and mix, add 10g of resorcinol, then slowly add 6ml of formaldehyde solution to the mixed solution, and stir in an oil bath at 40°C for 12h. After the reaction, the mixed solution was transferred to a high-pressure reactor, and placed in a vacuum drying oven at 100° C. for hydrothermal reaction for 26 hours for aging. Then the solid and liquid were separated, and the solid was vacuum-dried at 80° C. for 24 hours to obtain phenolic resin (PF) microspheres with a size of about 800 nm.
[0060] (2) Preparation of rare earth ion Ce 3+ Doped Zn(Fe,Ce) 2 o 4 Ferrite precursor solution. According to Zn(Fe,Ce) 2 o 4 Molar ratio, respectively weigh appropriate amount of nitrate, including Zn(NO 3 ) 2 , Fe(NO 3 ) 3 and Ce(NO 3 ) 3 , Put the weighed several nitrates into the beaker, and add an appropria...
Embodiment 3
[0069](1) Preparation of phenolic resin microspheres. Measure 270ml of deionized water, 25ml of absolute ethanol and 5ml of ammonia water into a dry 500mL three-neck flask and mix, add 6g of resorcinol, slowly add 3ml of formaldehyde solution, and stir in an oil bath at 30°C for 12h. After the reaction, the mixed solution was transferred to a high-pressure reactor, and placed in a vacuum oven at 100° C. for hydrothermal reaction for 24 hours for aging. Separation of solid and liquid, take the solid and vacuum dry at 70°C to obtain phenolic resin (PF) microspheres with a size of about 500nm.
[0070] (2) Preparation of rare earth ion Ce 3+ Doped Zn(Fe,Ce) 2 o 4 Ferrite precursor solution. According to Zn(Fe,Ce) 2 o 4 Molar ratio, respectively weigh appropriate amount of nitrate, including Zn(NO 3 ) 2 , Fe(NO 3 ) 3 and Ce(NO 3 ) 3 , Put the weighed several nitrates into the beaker, and add an appropriate amount of deionized water at the same time, fully dissolve in a...
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