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Magnetic mesoporous silica nanochain with core-shell structure and preparation method of nanochain

A technology of mesoporous silica and core-shell structure, which is applied in the fields of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problem of poor magnetic response effect of composite nanochain materials, difficult control of mesoporous structure, and irregular shape. Uniformity and controllability, etc., to achieve good biocompatibility, simple method, and good magnetic responsiveness

Active Publication Date: 2018-10-26
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the synthesis of core-shell composite one-dimensional nanochain materials with magnetic oxide particles as the core and ordered mesoporous silica materials as the shell has not been reported.
In the existing related reports, the synthesized composite nanochain materials have disadvantages such as poor magnetic response effect, unstable structure, controllable uneven shape, difficult to control mesoporous structure, and poor biocompatibility.

Method used

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  • Magnetic mesoporous silica nanochain with core-shell structure and preparation method of nanochain

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Disperse 50 mg of magnetic Fe3O4 nanoparticles with a size of 150 nm in a three-necked round-bottomed flask containing 60 mL of absolute ethanol, and disperse them uniformly by ultrasonic dispersion for 10 minutes. 3.0 g of concentrated ammonia solution (28 wt %) was added dropwise to the above mixture, and mechanically stirred at a speed of 700 rpm in a water bath at 30 °C for 20 minutes.

[0026] Reduce the stirring speed to 300 rpm, add 0.3 mL (about 0.28 g) tetraethyl orthosilicate (TEOS) dropwise with a syringe, continue stirring for 15 minutes, stop stirring, and place the solution in a stable magnetic field with a strength of 28.5 mT , for 80 seconds. After the completion, the magnetic field was removed, and the mixture was left to stand for 12 hours, then separated by a magnetic field, and washed with absolute ethanol three times to obtain ferric oxide / silicon dioxide nanochains with a core-shell structure.

[0027](2) Weigh 56 mL of deionized water into a ...

Embodiment 2

[0030] (1) Disperse 50 mg of magnetic Fe3O4 nanoparticles with a size of 250 nm in a three-necked round-bottomed flask containing 60 mL of absolute ethanol, and ultrasonically disperse for 10 minutes to make them uniformly dispersed. 3.0 g of concentrated ammonia solution (28 wt %) was added dropwise to the above mixture, and mechanically stirred at a speed of 700 rpm in a water bath at 30 °C for 20 minutes.

[0031] Reduce the stirring speed to 300 rpm, add 0.4 mL (about 0.37 g) tetraethyl orthosilicate (TEOS) dropwise with a syringe, and continue stirring for 15 minutes, then stop stirring, and place the solution in a stable magnetic field with a strength of 50.5 mT , for 80 seconds. After the completion, the magnetic field was removed, and the mixture was left to stand for 12 hours, then separated by a magnetic field, and washed with absolute ethanol three times to obtain ferric oxide / silicon dioxide nanochains with a core-shell structure.

[0032] (2) Weigh 56 mL of deion...

Embodiment 3

[0035] (1) 80 mg of magnetic NiFe with a size of 300 nm 2 o 4 Nanoparticles were dispersed in a three-necked round-bottom flask containing 60 mL of absolute ethanol, and ultrasonically dispersed for 10 minutes to make them uniformly dispersed. 3.0 g of concentrated ammonia solution (28 wt %) was added dropwise to the above mixture, and mechanically stirred rapidly at a speed of 700 rpm in a water bath at 30 °C for 20 minutes.

[0036] Reduce the stirring speed to 300 rpm, add 0.4 mL (about 0.37 g) tetraethyl orthosilicate (TEOS) dropwise with a syringe, continue stirring for 15 minutes, stop stirring, and place the solution in a stable magnetic field with a strength of 35.5 mT , for 80 seconds. After the end, remove the magnetic field, let the mixture stand for 12 hours, separate it by a magnetic field, and wash it three times with absolute ethanol to obtain NiFe with a core-shell structure. 2 o 4 / Silica nanochains.

[0037] (2) Weigh 56 mL of deionized water into a thr...

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Abstract

The invention belongs to the technical field of advanced nanocomposites, and particularly relates to a magnetic mesoporous silica nanochain with a core-shell structure and a preparation method of thenanochain. The method comprises the following steps of firstly, coating a layer of amorphous silica on the surface of magnetic inorganic nanoparticles by using a sol-gel chemical synthesis method, andinducing oriented arrangement of the magnetic inorganic nanoparticles to form a one-dimensional core-shell structure nanochain through applying an external magnetic field; secondly, utilizing an organic surfactant as a self-assembly behavior of a structure-directing agent and an inorganic species in solution, and coating a layer of silica / surfactant composite on the surface of a magnetic inorganic nanoparticle / silica composite nanochain through an organic chambering solvent; and finally, removing the surfactant through solvent extraction in order to obtain a magnetic inorganic nanoparticle / silica core-shell structure nanochain composite with ordered mesoporous vertical divergence pore channels. The nanochain has a relatively high specific surface area, a large pore size, good magnetic responsiveness and biocompatibility, and a wide application prospect in the aspects of biological separation, adsorption, drug loading and the like.

Description

technical field [0001] The invention belongs to the technical field of advanced nanocomposite materials, and specifically relates to a magnetic mesoporous silica nanochain with a core-shell structure and a preparation method thereof. Background technique [0002] In recent years, magnetic nanomaterials, especially those based on nanoscale iron oxides, have been widely used in bioseparation and enrichment, catalysis, drug delivery, magnetic separation, and nuclear magnetic resonance imaging due to their unique physical and chemical properties. aroused increasing research interest. Among them, the core-shell composite nanomaterial with magnetic iron oxide particles as the core and silica material as the shell has low toxicity to organisms due to its magnetic response characteristics, and the structure and morphology of the outer layer of silica are easy to control, and Different functional groups can be grafted on the surface of silica through chemical modification, thereby i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/00H01F41/02
CPCH01F1/0081H01F41/02
Inventor 邓勇辉万里
Owner FUDAN UNIV
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