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Magnetic mesoporous silica composite microsphere with Yolk-Shell structure and manufacturing method thereof

A technology of mesoporous silica and composite microspheres, which is applied in the preparation of microspheres, microcapsule preparation, magnetic properties of inorganic materials, etc., can solve the problem of uneven morphology of composite materials, damage to mesoporous channel structure, and difficulty in controlling cavity size, etc. problem, to achieve the effect of agile magnetic response, high pore volume, and simple method

Active Publication Date: 2014-04-09
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The synthesized composite material has the disadvantages of poor magnetic response effect, uneven composite material shape, difficult to control the cavity size, poor dispersion of iron oxide exposed to air, and destroyed mesoporous channel structure.

Method used

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  • Magnetic mesoporous silica composite microsphere with Yolk-Shell structure and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Evenly disperse 0.1 g of magnetic ferric oxide particles with a size of about 150 nm in 80 mL of ethanol, 20 mL of deionized water and 1 mL of concentrated ammonia water (28 wt%), 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 before use.

[0024] (2) Ultrasonic disperse the magnetic Fe3O4 composite microspheres deposited with a layer of silicon dioxide on the surface in a solution containing 30 mL ethanol, 15 mL deionized water, 1.25 g concentrated ammonia water, stir mechanically for 10 min, and add 0.2 g methanedioxide Phenol, stirred for 20 min, and added 0.30 ml of formaldehyde. Stirring was continued for 4 hours, the product was separated by a magnet and washed with a mixed solution o...

Embodiment 2

[0027] (1) 0.1 g magnetic NiFe with a size of about 250 nm 2 o 4 The particles were evenly dispersed in 70 mL of ethanol, 30 mL of deionized water and 1 mL of concentrated ammonia water (28 wt%), added 0.2 g of tetraethyl orthosilicate (TEOS), and stirred at room temperature for 6 h to obtain 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.

[0028] (2) Magnetic NiFe after depositing a layer of silicon dioxide on the surface 2 o 4 The composite microspheres were ultrasonically dispersed in a solution containing 60 mL ethanol, 30 mL deionized water, and 1.25 g concentrated ammonia water, stirred mechanically for 10 min, added 0.2 g aminophenol, stirred for 20 min, and added 0.30 ml formaldehyde. Continue stirring for 4h, the product is separated by a magnet and washed with a ...

Embodiment 3

[0031] (1) Uniformly disperse 0.1 g magnetic γ-iron sesquioxide particles with a size of about 400 nm in 90 mL ethanol, 10 mL deionized water and 1 mL concentrated ammonia water (28 wt%), add 0.05 g tetraethyl orthosilicate (TEOS), 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 before use.

[0032] (2) Ultrasonic disperse the magnetic γ-Fe2O3 composite microspheres after depositing a layer of silicon dioxide on the surface in 90 mL deionized water, 0.35 ml formaldehyde, stir and heat to 80 o C, add 0.2 g melamine, add 0.10 ml formic acid after dissolving, stir for 4 h, separate the product with a magnet and wash with a mixed solution of ethanol and water to obtain a sandwich structure composite of magnetic γ-ferric oxide / silica / melamine resin Microsp...

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Abstract

The invention belongs to the technical field of advanced nano materials, and particularly relates to a magnetic mesoporous silica composite microsphere with a Yolk-Shell structure and a manufacturing method of the magnetic mesoporous silica composite microsphere. Firstly, a sol-gel chemical synthesis method is adopted, and a magnetic nanoparticle is coated with a macromolecule layer of amorphous silicon dioxide and a macromolecule layer of polymer resin in sequence; then the self-assembling behavior of organic surface active agents as structural guiding agents and inorganic substances in solutions is utilized, and the magnetic nanoparticle is coated with a layer of silicon dioxide / surface active agent composite materials with an ordered mesostructure; the surface active agents and the macromolecule layers are removed through roasting, and then the materials of the magnetic mesoporous silica composite microsphere with the Yolk-Shell structure are obtained. The composite microsphere is provided with a large adjustable cavity, a high specific surface area and mesoporous shell layers evenly perpendicular to an interface, has magnetic responsiveness strong in stability, and has wide application prospects in nanoreactors, drug sustained release, high-capacity bioseparation and absorption. The method is simple, raw materials are easy to obtain, and amplification production can be achieved.

Description

technical field [0001] The invention belongs to the technical field of advanced nanometer materials, and specifically relates to a class of magnetic mesoporous silicon oxide composite microsphere materials with a Yolk-Shell structure and a preparation method thereof. Background technique [0002] In recent years, Yolk-Shell structure composite microspheres can provide a large storage volume due to their large internal cavity, and at the same time integrate the properties of the core and shell, and are used in drug delivery, controlled release, nanoreactors, catalysis, and large capacity There are many potential applications in adsorption and separation. Yolk-Shell structure composite microspheres with magnetic iron oxide particles as the core, mesoporous silica material as the shell, and a large tunable cavity in between have attracted extensive attention. The reason is that this composite microsphere has magnetic response characteristics, which can simplify and facilitate ...

Claims

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Application Information

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IPC IPC(8): H01F1/11H01F1/01B01J13/02
Inventor 邓勇辉岳秦王明宏陈瑾蔡华强
Owner FUDAN UNIV
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