Hollow bowl-shaped silicon dioxide nanoparticles, preparation method and application thereof

A nanoparticle, silica technology, applied in the field of materials, can solve problems to be developed and so on

Active Publication Date: 2017-05-10
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are relatively few studies and reports on the synthesis of hollow bowl-shaped nanoparticles, and the large-scale synthesis of hollow concave hemispherical nanoparticles and related processes have yet to be developed.

Method used

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  • Hollow bowl-shaped silicon dioxide nanoparticles, preparation method and application thereof
  • Hollow bowl-shaped silicon dioxide nanoparticles, preparation method and application thereof
  • Hollow bowl-shaped silicon dioxide nanoparticles, preparation method and application thereof

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preparation example Construction

[0053] The invention provides a method for preparing hollow bowl-shaped silicon dioxide nanoparticles, the method comprising the steps of:

[0054] 1) providing a first mixed solution, a catalyst, a silicon source, and a first solvent, wherein the first mixed solution includes polymer nanoparticles and a second solvent;

[0055] 2) under stirring conditions, mix the first mixed liquid and the catalyst, and react to obtain the second mixed liquid;

[0056] 3) under stirring conditions, mixing the second mixed solution and the silicon source, and reacting to obtain a third mixed solution containing silica-coated polymer nanoparticles;

[0057] 4) coating the third mixed solution on the substrate, and drying to obtain a substrate coated with a silica-coated polymer nanoparticle coating;

[0058] 5) Soak the product obtained in step 4) in the first solvent, take out the matrix, and dry to obtain the hollow bowl-shaped silica nanoparticles.

[0059] In the present invention, the ...

Embodiment 1

[0115] Embodiment 1 Hollow bowl-shaped silica nanoparticle 1

[0116] Take 1.5g of polyvinylpyrrolidone (average relative molecular weight 58000), 0.35g of azobisisobutylamidine hydrochloride, 100mL of distilled water, mix and stir at room temperature, after the solution is clarified, add 11mL of styrene monomer, and pass into N 2 2h; then at 70°C, stirring at a speed of 200rpm, stirring for 24h to obtain polystyrene nanoparticles 1 with an average particle diameter of about 240nm.

[0117] Take 5.0 g of the polystyrene nanoparticles 1 obtained above, dissolve them in 40 mL of absolute ethanol, and ultrasonically dissolve them for 30 min to obtain a 7.0 wt % suspension; at 50 ° C, the stirring speed is 200 rpm, Add 5mL of ammonia water to the suspension, and after 5min, add 1.5mL of silicon source, the silicon source is tetraethyl orthosilicate and methyltriethoxysilane with a volume ratio of 1:3, and react for 3h to obtain the average particle size Silica-coated polystyrene...

Embodiment 2 2

[0126] Embodiment 2 Silica nanoparticles 2

[0127] Take 0.1g of polyvinylpyrrolidone (average relative molecular weight 58000), 0.05g of potassium persulfate, 100mL of distilled water, mix and stir at room temperature, after the solution is clarified, add 2mL of styrene monomer, and pass through N 2 0.5 h; then at 40° C. with a stirring speed of 500 rpm for 12 h to obtain polystyrene nanoparticles 2 with an average particle diameter of about 100 nm.

[0128] Take 0.71g of the polystyrene nanoparticles 2 obtained above, dissolve them in 40mL of methanol, and ultrasonically disperse them for 30min to obtain a 1.0wt% suspension; at 20°C, the stirring speed is 500rpm, and Add 2mL of ammonia water to the suspension, and after 5min, add 0.5mL of silicon source, the silicon source is methyl orthosilicate and methyltrimethoxysilane with a volume ratio of 2:1, and react for 0.5h to obtain an average particle size of 110nm 2 left and right silica-coated polystyrene nanoparticles.

...

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Abstract

The present invention relates to hollow bowl-shaped silicon dioxide nanoparticles, a preparation method and an application thereof. In particular, the present invention discloses the preparation method of the hollow bowl-shaped silicon dioxide nanoparticles. The method has the characteristics of being mild in preparation method, simple in operation, and meeting the demands of scale productions. The hollow bowl-shaped silicon dioxide nanoparticles have the novel hemispherical hollow recess structure, therefore have special physical properties (such as optical properties), and are expected to be used in the various application fields of film coating, gas sensing, catalysis, drugs, biology, etc.

Description

technical field [0001] The invention relates to the field of materials, in particular to a hollow bowl-shaped silicon dioxide nanoparticle and a preparation method and application thereof. Background technique [0002] Nanoparticles are an important part of nanomaterials, in which oxides (silicon dioxide, titanium dioxide, etc.) coat organic matter (polystyrene, polymethyl methacrylate, etc.) to form core-shell composite particles, which is an important part of the preparation of nanoparticles. One of the research directions. Among them, the core-shell composite particles can also be calcined or dissolved to remove the core, so as to obtain nanomaterials with a hollow structure. Compared with solid nanomaterials of the same size, hollow nanoparticles have the advantages of low density, large specific surface area, high stability, can encapsulate a variety of guest molecules, and have strong surface permeability. Coating and other fields have important application value. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12B82Y40/00
CPCC01B33/12C01P2004/03C01P2004/30C01P2004/64
Inventor 陈玲玲王彪孙爱华许高杰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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