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Magnetic inorganic nanoparticle and ordered mesoporous material core-shell composite material and preparation method thereof

A technology of inorganic nanoparticles and mesoporous materials, which is applied in inorganic chemistry, chemical instruments and methods, and other chemical processes, etc., can solve the problems of poor universality of preparation methods, complex synthesis steps and disorder, and achieve simple and sensitive steps. Magnetic Response Characteristics, Effects of Large Apertures and Pore Volumes

Pending Publication Date: 2022-04-26
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

First, the synthesis steps are complicated, and it is usually necessary to wrap a layer of dense silica or polymer on the surface of the magnetic particles to ensure the uniform wrapping of the mesoporous shell. It is still very difficult to directly wrap the mesoporous shell on the surface of the magnetic particles; second. , the preparation method has poor universality. Most of the composite materials reported so far are concentrated in silica-based mesoporous shells. It is still a challenge to construct carbon-based or oxide-based mesoporous shells on the surface of magnetic particles under control; Third, the disordered or mesopores parallel to the surface of the microspheres in the synthesized composite materials have certain deficiencies in material transport.

Method used

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  • Magnetic inorganic nanoparticle and ordered mesoporous material core-shell composite material and preparation method thereof
  • Magnetic inorganic nanoparticle and ordered mesoporous material core-shell composite material and preparation method thereof
  • Magnetic inorganic nanoparticle and ordered mesoporous material core-shell composite material and preparation method thereof

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preparation example Construction

[0039] The present invention provides a preparation method of magnetic inorganic nanoparticles@ordered mesoporous material core-shell composite material, comprising the following steps:

[0040](1) dissolving the surfactant, the shell precursor and the catalyst in an organic solvent to obtain a mixed solution;

[0041] (2) drying the mixed solution obtained in step (1) to obtain a single micelle gel;

[0042] (3) The single micelle gel obtained in step (2) is mixed with magnetic inorganic nanoparticles, organic alcohols and water and then reacted. The reaction product is washed, dried and calcined at high temperature to obtain magnetic inorganic nanoparticles@ordered mesoporous material core-shell composite materials;

[0043] Among them, the specific surface area of ​​magnetic inorganic nanoparticles@ordered mesoporous material core-shell composite material is 50-1200m 2 / g, the mesopore size is 2-40nm, and the mesoporous shell thickness is 5-100nm;

[0044] The ordered me...

Embodiment 1

[0065] This example provides a γ-ferric oxide particle@mesoporous titanium dioxide composite material and its preparation method.

[0066] Mix 0.1mmol F127 (surfactant), 30mL tetrahydrofuran and 2.4mmol concentrated hydrochloric acid (36-38wt%), stir at room temperature for 30 minutes to obtain a clear and transparent mixed solution, then add 1mmol tetrabutyl titanate, and continue stirring for one hours; the mixed solution was transferred to a constant temperature drying oven, and placed at 40°C for 48h to obtain a white single micelle gel;

[0067] Disperse 1.0g of single micellar gel and 100mg of γ-iron sesquioxide particles in a mixed solution of 30mL of ethanol and 100mL of water, and then heat at 70°C for 12h; The surface active agent was removed by roasting at 500°C for 3 hours, and the γ-Fe2O3 particles@mesoporous titanium dioxide composite material was obtained.

[0068] figure 1 The scanning electron micrograph shows that the γ-ferric oxide particles@mesoporous tit...

Embodiment 2

[0073] This example provides a γ-ferric oxide particle@mesoporous titanium dioxide composite material and its preparation method.

[0074] Mix 0.1mmol F127 (surfactant), 30mL tetrahydrofuran and 2.4mmol concentrated hydrochloric acid (36-38wt%), stir at room temperature for 30 minutes to obtain a clear and transparent mixed solution, then add 1mmol tetrabutyl titanate, and continue stirring for one hours; the mixed solution was transferred to a constant temperature drying oven, and placed at 40°C for 48h to obtain a white single micelle gel;

[0075] Disperse 2.0g of single micellar gel and 100mg of γ-iron sesquioxide particles in a mixed solution of 30mL of ethanol and 100mL of water, then heat at 70°C for 12h; Roast at 500°C for 3 hours to remove the surfactant, and obtain a shell with a thickness of 30nm, a pore diameter of 8.0nm, and a specific surface area of ​​220m 2 / g, γ-Fe2O3 particles@mesoporous titania composites with space group P6mm.

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Abstract

The invention relates to the technical field of functional material preparation, in particular to a magnetic inorganic nanoparticle and ordered mesoporous material core-shell composite material and a preparation method thereof.The preparation method specifically comprises the steps that firstly, a shell layer precursor, a surfactant and a catalyst are dissolved in an organic solvent, and a mixed solution is obtained; drying the mixed solution to obtain single micelle gel; dispersing the single micelle gel and the magnetic inorganic nanoparticles in an organic alcohol-water solution, heating, further hydrolyzing and cross-linking the shell precursor which is not completely hydrolyzed, and inducing the single micelle to be assembled on the surfaces of the inorganic nanoparticles; and finally, roasting at high temperature to remove the surfactant to obtain the magnetic inorganic nanoparticle and ordered mesoporous material core-shell composite material. The composite material has high specific surface area and strong magnetic responsiveness, and has wide application prospects in the aspects of biological separation and adsorption. The method is simple, raw materials are easy to obtain, and the method is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of preparation of functional materials, in particular to a magnetic inorganic nanoparticle@ordered mesoporous material core-shell composite material and a preparation method thereof. Background technique [0002] In recent years, with the needs of people in biological analysis, separation, enzyme immobilization, and disease diagnosis, core-shell composites with magnetic particles as the core and mesoporous materials as the shell have attracted widespread attention. This composite material can combine the magnetic response characteristics of magnetic nanoparticles and the high specific surface area, high pore volume and uniform mesoporous channels of mesoporous materials, so as to achieve the purpose of simplifying and convenient separation and analysis. [0003] So far, the synthesis of core-shell composite nanospheres with magnetic nanoparticles as the core and mesoporous materials as the shell has been rep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/28B01J20/20B01J20/06B01J20/30
CPCB01J20/28009B01J20/28004B01J20/20B01J20/06B01J20/0211
Inventor 李伟张威杨东赵东元
Owner FUDAN UNIV
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