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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

Active Publication Date: 2017-05-10
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing reports, the synthesized composite materials have disadvantages such as poor magnetic response effect, uneven composite shape, low cavity generation efficiency, and inability to disperse well in water.
In addition, the disordered or mesopores parallel to the surface of the microspheres in the synthesized materials have certain deficiencies in material transport.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention belongs to the technical field of advanced nanocomposite materials and particularly relates to a magnetism inorganic nanoparticle / ordered mesopore silica nuclear shell composite microsphere and a preparing method thereof. A amorphous silica layer wraps the surface of a magnetism inorganic nanoparticle first, then an organic polymer layer carries out wrapping through organic polymer polymerization reaction, self-assembly behavior of an organic surface active agent which is used as a structure guiding agent and inorganic matter in a solution is used, silicon source precursor hydrolysis is used, a silicon dioxide / surfactant composite material layer with an ordered mesostructure wraps the surface of a magnetism inorganic nanoparticle / organic polymer composite microsphere, then the surfactant and the organic polymer layer are removed at the same time by high-temperature roasting, and the target composite microsphere is obtained. The composite microsphere has large specific surface area and strong magnetic responsiveness and has wide application prospect in bioseparation and adsorption. The method is simple, raw materials are easy to get, and amplified production is benefited.

Description

technical field [0001] The invention belongs to the technical field of advanced nanocomposite materials, and specifically relates to a magnetic inorganic nanoparticle / ordered mesoporous silica core-shell composite microsphere and a preparation method thereof. [0002] technical background [0003] In recent years, with the needs of people in biological analysis, separation, enzyme immobilization, and disease diagnosis, core-shell composite microspheres with magnetic oxide particles as the core and silica materials as the shell have attracted widespread attention. The reason is that this composite microsphere has magnetic response characteristics, can simplify and facilitate separation and analysis, has low toxicity to organisms, and can graft different functional groups on the surface of silica through chemical modification, thereby increasing its density. application field. [0004] Compared with traditional silica materials, ordered mesoporous silica materials have the cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/01B01J13/02B01J13/14
Inventor 邓勇辉岳秦王灿王明宏赵东元
Owner FUDAN UNIV
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