Magnetic inorganic nanoparticles/ordered mesoporous silica core-shell composite microspheres and preparation method thereof
A technology of mesoporous silica and core-shell composite microspheres, which is applied in the preparation of microspheres, microcapsule preparations, magnetic properties of inorganic materials, etc., can solve the problem of poor magnetic response effect of composite materials, uneven shape of composite materials, and generation of cavities The problem of low efficiency is to achieve the effect of simple and rapid method, high purity of synthetic material and high pore volume
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Embodiment 1
[0028] (1) Uniformly disperse 0.1 g of magnetic ferric oxide particles with a size of about 300 nm in 80 mL of ethanol, 20 mL of deionized water and 1 mL of concentrated ammonia water (28 wt%), and add 0.3 g of tetraethyl orthosilicate ( TEOS) and stirred at room temperature for 6 h to obtain magnetic composite microspheres with a layer of silica deposited on the surface. The product was separated by a magnet and washed with a mixed solution of ethanol and water. After washing, the product was dried at room temperature and then used.
[0029](2) The magnetic Fe3O4 composite microspheres deposited with a layer of silicon dioxide on the surface were ultrasonically dispersed in a mixed solution containing 40 mL of ethanol, 20 mL of deionized water, and 1.00 g of concentrated ammonia water (28 wt%), and stirred for 0.5 h after making the solution uniform, add 0.1 g phenol and 0.2 g formaldehyde dropwise successively, continue to stir for 6 h after the dropwise addition is complete,...
Embodiment 2
[0033] (1) Uniformly disperse 0.1 g of magnetic ferric oxide particles with a size of about 500 nm in 100 mL of ethanol, 10 mL of deionized water and 1 mL of concentrated ammonia water (28 wt%), add 0.25 g of tetraethyl orthosilicate (TEOS ), stirred at room temperature for 6 hours to obtain magnetic composite microspheres with a layer of silicon dioxide deposited on the surface, and the product was separated by a magnet and washed with a mixed solution of ethanol and water. After washing, the product was dried at room temperature and then used.
[0034] (2) The magnetic ferric oxide composite microspheres deposited with a layer of silicon dioxide on the surface were ultrasonically dispersed in a mixed solution containing 30 mL ethanol, 40 mL deionized water, and 1.50 g dilute hydrochloric acid (20 wt%), and stirred for 0.5 h after making the solution uniform, add 0.15 g phenol and 0.25 g formaldehyde dropwise successively, continue to stir for 6 h after the dropwise addition i...
Embodiment 3
[0038] (1) 0.1 g magnetic NiFe with a size of about 300 nm 2 o 4 The particles were uniformly dispersed in 90 mL ethanol, 10 mL deionized water and 1 mL concentrated ammonia water (28 wt%), added 0.5 g tetraethyl orthosilicate (TEOS), stirred at room temperature for 10 h, and obtained a layer of dioxane deposited on the surface. Silicon oxide magnetic composite microspheres, the product is separated by a magnet and washed with a mixed solution of ethanol and water, and the product is dried at room temperature after washing for use.
[0039] (2) Magnetic NiFe after depositing a layer of silicon dioxide on the surface 2 o 4 The composite microspheres were ultrasonically dispersed in a mixed solution containing 30 mL ethanol and 50 mL deionized water. After stirring for 0.5 h to make the solution uniform, 0.2 g phenol and 0.3 g formaldehyde were added drop by drop. After stirring for 6 h, the magnetic NiFe 2 o 4 Particles / amorphous silica / phenolic resin composite microsphere...
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