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Preparation method of core-shell structure silicon dioxide spherical nanoparticles

A technology of core-shell structure and silica, applied in the direction of silica, silica, etc., can solve the problems of high preparation cost and complicated method, and achieve the effect of simple preparation, simple operation method and large surface area

Active Publication Date: 2019-10-25
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there have been some reports on the synthesis methods of core-shell particles, most of them are complicated and expensive to prepare.

Method used

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  • Preparation method of core-shell structure silicon dioxide spherical nanoparticles
  • Preparation method of core-shell structure silicon dioxide spherical nanoparticles
  • Preparation method of core-shell structure silicon dioxide spherical nanoparticles

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preparation example Construction

[0035] As introduced in the background art, the current preparation method of core-shell silica particles is complicated and costly. Therefore, one of the objectives of the present invention is to provide a method for synthesizing silica spherical nanoparticles with a core-shell structure without using a microemulsion of a surfactant, which is simple, efficient and environmentally friendly. The preparation method of silica nano-spherical particles with core-shell structure comprises:

[0036] (1) Preparation of O / W type diethyl malonate / ethanol / water surfactant-free microemulsion: Diethyl malonate, ethanol and water are formulated into a clear and transparent microemulsion according to a certain ratio;

[0037] (2) O / W diethyl malonate / ethanol / water surfactant-free microemulsion, under magnetic stirring, add TEOS and APTES, and they will dissolve in the oil core to form a reactive microenvironment. Then, ammonia water is added as a catalyst, and the reactants condense to form...

Embodiment 1

[0053] (1) Preparation of O / W type surfactant-free microemulsion: In the reaction flask, add 4.0g ultrapure water and 36.0g ethanol, add 2.6g diethyl malonate under the action of magnetic stirring, keep stirring at room temperature for 30min , until the solution is mixed.

[0054] (2) Preparation of solid silica nanoparticles

[0055] Add 1 mL tetraethyl orthosilicate to the microemulsion, then add 0.4 mL APTES ethanol solution, maintaining magnetic stirring. Both substances are completely dissolved in the oil nucleus.

[0056] (3) The reaction flask was placed in an ice-water bath for 2 h with magnetic stirring, then 1.5 mL of ammonia water (25% wt) was added, and after being kept in the ice-water bath for 30 minutes, the reaction was changed to room temperature for 60 h with magnetic stirring.

[0057] (4) After the reaction, centrifuge to obtain a white precipitate, which is washed twice with water and ethanol. After obtaining the white powder, put it in an oven at 60°C ...

Embodiment 2

[0059] Dissolve an appropriate amount of white powder prepared in Example 1 in ultrapure water at 40°C, keep the temperature at a constant temperature for 144 hours, then centrifuge, wash once with water and ethanol to obtain a white solid, and place it in an oven at 60°C for 12 hours. Save for testing.

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Abstract

The invention relates to a preparation method of core-shell structure silicon dioxide spherical nanoparticles. The preparation method comprises the steps that TEOS and APTES are added into O / W type surfactant free microemulsion, and after completely dissolved, SiO2 is formed by condensation under the presence of ammonia water, and solid SiO2 particles are collected; and etching is conducted, and namely the core-shell structure silicon dioxide spherical nanoparticles are obtained. TEOS and APTES are used for synthesizing the silicon dioxide spherical particles, and the results of etching in warm water are compared with the results of etching in HF. According to the preparation method, surfactant is not used, with the O / W type surfactant free microemulsion, spherical particles with good shape and even size are synthesized, and the synthesis process is simple and fast. Thus, the preparation method has the characteristics of friendly environment, low cost, high efficiency and actionability.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, and in particular relates to a preparation method of core-shell structure silica nanometer spherical particles. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Nanomaterials have important applications in drug delivery, catalysis, and environmental protection. There are more and more studies on the preparation of nanomaterials using traditional surfactant microemulsions as templates. Nano-silica with mesoporous, hollow, and core-shell structures can be used in many fields such as drug delivery, catalysis, and biological detection, and has attracted widespread attention. Nano-silica wit...

Claims

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Application Information

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IPC IPC(8): C01B33/18
CPCC01B33/18C01P2004/03C01P2004/04C01P2004/32C01P2004/62
Inventor 柴金岭宋苗苗
Owner SHANDONG NORMAL UNIV
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