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Graded radiation super-macroporous silicon dioxide nanosphere, and preparation method and application thereof

A silica and super-porous technology, applied in the field of nanomaterials, can solve the problem of lack of green, achieve the effect of not harsh process conditions, conducive to migration, and reduce volume change

Pending Publication Date: 2022-02-01
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technical solution uses carbon spheres as a template, and utilizes the electrostatic interaction between the electronegativity of carbon spheres and the surfactant CTAB, so that TEOS can be adsorbed, hydrolyzed, and polycondensed on its surface, and there is still room for improvement.
[0004] According to the review, the prior art still lacks a green, environmentally friendly, easy-to-modify and efficient preparation method for the preparation of super-porous silica

Method used

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  • Graded radiation super-macroporous silicon dioxide nanosphere, and preparation method and application thereof
  • Graded radiation super-macroporous silicon dioxide nanosphere, and preparation method and application thereof
  • Graded radiation super-macroporous silicon dioxide nanosphere, and preparation method and application thereof

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Effect test

Embodiment 1

[0034] The preparation method of graded radiation ultra-macroporous silica nanospheres is as follows: mix 70mL deionized water, 20mL ether and 10mL absolute ethanol, add 0.5g CTAB (cetyltrimethylammonium bromide), and then add 0.8 mL of ammonia water, stirred for 30 minutes, so that CTAB is fully dissolved and the whole system is evenly mixed. Then add 2.5mL TEOS (tetraethyl orthosilicate), and stir vigorously at room temperature for 4 hours, so that the silicon source precursor is hydrolyzed and polymerized at the internal and external interfaces of the dispersant and ether emulsion droplets. Afterwards, the hydrolysis reaction product was suction-filtered, washed three times with deionized water and absolute ethanol, and then dried in an oven at 50°C, and then refluxed with ethanol solution of hydrochloric acid to remove CTAB. During this process, the surfactant successfully introduced the mesoporous structure into the radiative hierarchical structure, and the hydrolysis of ...

Embodiment 2

[0039]The preparation method of graded radiation ultra-macroporous silica nanospheres is as follows: mix 70mL deionized water, 10mL ether and 20mL ethanol, add 0.5g CTAB (cetyltrimethylammonium bromide), and then add 0.8mL ammonia water , stirred for 30 minutes, so that CTAB is fully dissolved and the whole system is evenly mixed. Then add 2.5mL TEOS (tetraethyl orthosilicate), and stir vigorously at room temperature for 4 hours, so that the silicon source precursor is hydrolyzed and polymerized at the internal and external interfaces of the dispersant and ether emulsion droplets. Afterwards, the hydrolysis reaction product was suction-filtered, washed three times with deionized water and absolute ethanol, and then dried in an oven at 50°C, and then refluxed with ethanol solution of hydrochloric acid to remove CTAB. During this process, the surfactant successfully introduced the mesoporous structure into the radiative hierarchical structure, and the hydrolysis of the silicon s...

Embodiment 3

[0041] The preparation method of hierarchical radiation ultra-large porous silica nanospheres is as follows: mix 70mL deionized water, 5mL ether and 25mL ethanol, add 0.5g CTAB (cetyltrimethylammonium bromide), and then add 0.8mL ammonia water , stirred for 30 minutes, so that CTAB is fully dissolved and the whole system is evenly mixed. Then add 2.5mL TEOS (tetraethyl orthosilicate), and stir vigorously at room temperature for 4 hours, so that the silicon source precursor is hydrolyzed and polymerized at the internal and external interfaces of the dispersant and ether emulsion droplets. Afterwards, the hydrolysis reaction product was suction-filtered, washed three times with deionized water and absolute ethanol, and then dried in an oven at 50°C, and then refluxed with ethanol solution of hydrochloric acid to remove CTAB. During this process, the surfactant successfully introduced the mesoporous structure into the radiative hierarchical structure, and the hydrolysis of the si...

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Abstract

The invention belongs to the technical field of nano materials, and particularly relates to a graded radiation super-macroporous silicon dioxide nanosphere, and a preparation method and application thereof. The preparation method comprises the following steps: (1) adding a silicon source precursor into a solution containing a catalyst, a dispersing agent and a surfactant, and performing stirring reaction, wherein the dispersing agent comprises diethyl ether and an alcohol solvent; and (2) stirring a solution obtained in step (1) at 25-30 DEG C for reaction to obtain the graded radiation super-macroporous silicon dioxide nanosphere, wherein the super-macropore refers to that the pore diameter is greater than 20 nm. In the graded radial super-macroporous mesoporous silicon dioxide nanosphere material prepared by the method, a mesoporous structure is effectively introduced into the pore wall particles of the super-macroporous structure, so that the material obtains higher guest molecule loading characteristic.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and more specifically relates to a hierarchical radiation ultra-large porous silica nanosphere and its preparation method and application. Background technique [0002] Porous silica microspheres have the advantages of good stability, high specific surface area, easy modification and good biological safety, and are widely used in the fields of catalysis, adsorption and biomedicine. In the past 10 years, the preparation of silica based drug carriers has focused on silica nanospheres with high dispersion less than 200 nm. However, the silica obtained based on soft template surfactant micelles usually has a small pore size of about 3nm, which has achieved great success in the field of small molecule loading, but it is still a challenge for the loading of macromolecules or larger particles. major challenge. Therefore, silica with macroporous or ultramacroporous structures has attracted extens...

Claims

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Application Information

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IPC IPC(8): C01B33/18B82Y40/00
CPCC01B33/18B82Y40/00C01P2006/16C01P2004/03C01P2004/04
Inventor 罗志强万影任小宁
Owner HUAZHONG UNIV OF SCI & TECH
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