Magnetic inorganic nano-particle/ordered meso-porous silica core-shell microspheres and preparation thereof
A technology of mesoporous silica and amorphous silica, applied in the direction of fibrous fillers, etc., can solve the problems of poor magnetic response effect of composite materials, uneven shape and disorder of composite materials, etc.
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[0015] Example 1:
[0016] (1) Disperse 0.1g magnetic ferroferric oxide particles with a size of about 300nm in 80ml ethanol, 20ml deionized water and 1ml concentrated ammonia (28wt%), add 0.3g ethyl orthosilicate (TEOS), room temperature After stirring for 6 hours, a magnetic composite microsphere with a layer of silica deposited on the surface was obtained. The product was separated with a magnet and washed with a mixed solution of ethanol and water. After washing, the product was dried at room temperature and then ready for use.
[0017] (2) The magnetic ferroferric oxide composite microspheres with a layer of silica deposited on the surface were ultrasonically dispersed in 60ml ethanol, 80ml deionized water, 1.00g concentrated ammonia and 0.30g cetyltrimethylammonium bromide (CTAB) mixed solution, after stirring for 0.5h to make the solution uniform, add 0.40g of ethyl orthosilicate (TEOS) dropwise, and continue to stir for 6h after the addition is complete, to obtain a magnet...
Example Embodiment
[0019] Example 2:
[0020] (1) Disperse 0.1g magnetic ferroferric oxide particles with a size of about 500nm in 100ml ethanol, 10ml deionized water and 1ml concentrated ammonia (28wt%), add 0.25g ethyl orthosilicate (TEOS), room temperature After stirring for 7 hours, a magnetic composite microsphere with a layer of silica deposited on the surface was obtained. The product was separated with a magnet and washed with a mixed solution of ethanol and water. After washing, the product was dried at room temperature and then ready for use.
[0021] (2) The magnetic ferroferric oxide composite microspheres with a layer of silica deposited on the surface were ultrasonically dispersed in 90ml ethanol, 60ml deionized water, 1.00g concentrated ammonia and 0.30g cetyltrimethylammonium bromide (CTAB) mixed solution, after stirring for 0.8h to make the solution uniform, add 0.40g ethyl orthosilicate (TEOS) dropwise, and continue to stir for 5h after the addition is complete, to obtain a magneti...
Example Embodiment
[0023] Example 3:
[0024] (1) Combine 0.1g magnetic NiFe with a size of about 300nm 2 O 4The particles are uniformly dispersed in 90ml of ethanol, 10ml of deionized water and 1ml of concentrated ammonia (28wt%), add 0.5g of ethyl orthosilicate (TEOS), stir at room temperature for 10h to obtain a magnetic composite with a layer of silica deposited on the surface For microspheres, the product is separated with a magnet and washed with a mixed solution of ethanol and water. After washing, the product is dried at room temperature and ready for use.
[0025] (2) Magnetic NiFe after depositing a layer of silicon dioxide on the surface 2 O 4 The composite microspheres were ultrasonically dispersed in 30ml ethanol, 110ml deionized water, 1.00g hydrochloric acid aqueous solution (1.0M) and 0.30g Brij 56(C 16 H 33 EO 10 ), after stirring for 0.4h to make the solution uniform, add 0.40g of methyl orthosilicate (TEOS) dropwise, and continue to stir for 8h after the addition is complete to ob...
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