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A method for preparing porous magnetic nanocrystal clusters by etching

A technology of magnetic nano and crystal clusters, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems that magnetic clusters cannot be prepared, single, and cannot be graded and modified, so as to achieve cheap raw materials, The method is simple and the effect is easy on the surface

Inactive Publication Date: 2015-08-26
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the magnetic nanoparticles obtained by these methods have gradually improved their colloidal stability and specific surface area, a single method still cannot prepare magnetic clusters with high specific surface area.
And the magnetic clusters that have not been post-processed cannot be graded because the internal and external differences do not exist.

Method used

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  • A method for preparing porous magnetic nanocrystal clusters by etching
  • A method for preparing porous magnetic nanocrystal clusters by etching
  • A method for preparing porous magnetic nanocrystal clusters by etching

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: specific surface area is 240m 2 / g porous magnetic nanoclusters were prepared.

[0026] Disperse 0.5 g of the prepared magnetic clusters in 500 mL of DMF, add 1 mL of methyl thioglycolate, 10 mL of hydrazine hydrate, and 0.3 g of azobisisobutyronitrile, under the protection of nitrogen atmosphere, at 80 °C Under mechanical stirring for 0.5 h. The product magnetic clusters were separated by magnetic separation, washed with absolute ethanol to remove unreacted reactants, and dried. Porous magnetic nanocrystal clusters are obtained by etching. The specific surface area of ​​the porous magnetic nanocrystal cluster is 240m 2 / g.

Embodiment 2

[0027] Embodiment 2: specific surface area is 463m 2 / g porous magnetic nanoclusters were prepared.

[0028] Disperse 0.5 g of the prepared magnetic clusters in 500 mL of DMF, add 1 mL of methyl thioglycolate, 10 mL of hydrazine hydrate, and 0.3 g of azobisisobutyronitrile, under the protection of nitrogen atmosphere, at 80 °C Under mechanical stirring for 0.75 h. The product magnetic clusters were separated by magnetic separation, washed with absolute ethanol to remove unreacted reactants, and dried. Porous magnetic nanocrystal clusters are obtained by etching. The specific surface area of ​​the porous magnetic nanocrystal cluster is 463m 2 / g.

Embodiment 3

[0029] Embodiment 3: specific surface area is 684m 2 / g porous magnetic nanoclusters were prepared.

[0030] Disperse 0.5 g of the prepared magnetic clusters in 500 mL of DMF, add 1 mL of methyl thioglycolate, 10 mL of hydrazine hydrate, and 0.3 g of azobisisobutyronitrile, under the protection of nitrogen atmosphere, at 80 °C Under mechanical stirring for 1.0 h. The product magnetic clusters were separated by magnetic separation, washed with absolute ethanol to remove unreacted reactants, and dried. Porous magnetic nanocrystal clusters are obtained by etching. The specific surface area of ​​the porous magnetic nanocrystal cluster is 684m 2 / g.

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Abstract

The invention belongs to the technical field of inorganic materials and in particular relates to a method for preparing porous magnetic nanoclusters through etching. According to the method, magnetic colloid nanoclusters subjected to surface glycosylation are taken as a precursor, and porous magnetic nanoclusters with high specific surface area are prepared through a one-step etching method. The method comprises the following steps: by taking agarose as a stabilizer, preparing to obtain the magnetic colloid nanoclusters (called magnetic clusters for short) through a solvothermal method; reacting the prepared magnetic clusters, hydrazine, mercaptoacetate molecules and radical initiators, uniformly etching the original magnetic clusters, and obtaining the porous magnetic nanoclusters with high specific surface area. According to the method, the specific surface area of the porous magnetic nanoclusters can be controlled by controlling the reaction conditions. The method is simple in operation and mild in reaction conditions and has high application prospects, and the porous magnetic nanoclusters which are regular in structures and are acid biodegradable can be prepared.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic materials, and in particular relates to a method for preparing porous magnetic nano crystal clusters by etching. Background technique [0002] In recent years, magnetic nanoparticles have been widely used in biomedicine due to their unique magnetic physical properties, which can displace under the action of an external magnetic field, and can produce unique magneto-thermal physical phenomena under the action of an alternating magnetic field. The preparation of functionalized magnetic particles, increasing its specific surface area, can improve the reactivity, and further expand its application in this area, such as biological diagnosis, enrichment of active biomolecules, immobilized enzyme catalysis, etc. [0003] At present, there are general chemical precipitation methods for preparing magnetic nanoparticles: using ferric iron and ferrous iron in proportion as the iron source, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/06B82Y30/00B82Y40/00
Inventor 李典汪长春
Owner FUDAN UNIV
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