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Method for preparing core-shell structured particles and hollow particles by ultrasonic field

A core-shell structure and particle technology is applied in the field of ultrasonic synthesis, which can solve the problems of low synthesis steps and yield limitations, and achieve the effect of controllable shell structure.

Active Publication Date: 2018-01-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the controllable preparation method of such particles is mainly based on the surface grafting method. Although this method has a high degree of controllability, relatively many synthesis steps and low yield still limit its application.

Method used

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  • Method for preparing core-shell structured particles and hollow particles by ultrasonic field
  • Method for preparing core-shell structured particles and hollow particles by ultrasonic field
  • Method for preparing core-shell structured particles and hollow particles by ultrasonic field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] a)SiO2 2 Activation: Add nano-SiO to a 100ml three-neck flask 2 (hydroxyl content 14%) 1.00g and dispersed in 30ml ethanol solution; using ultrasonic (10min)-intermittent (5min, pass N 2 Air) cycle mode for intermittent ultrasound 30min, ultrasound power 750W;

[0030]b) Three cycles of vacuum: 0.67g of NIPAm monomer and 0.067g of BIS (crosslinking agent) were dissolved in 30ml of deionized water, then added to a three-necked flask and vacuumed three times;

[0031] c) Selection of reaction conditions: inject nitrogen gas through the needle; select ultrasonic power of 750W, and use ultrasonic (10min)-intermittent (5min, pass N) at 25°C 2 Gas) circulation mode for polymerization reaction, the cumulative time of ultrasonic is 2h;

[0032] d) Post-treatment: the product is separated, and separated by centrifugation and changing the liquid three times with ultrapure water. Freeze drying box, low temperature vacuum drying for 24h.

Embodiment 2

[0034] a)SiO2 2 Activation: Add nano-SiO to a 100ml three-neck flask 2 (hydroxyl content 14%) 1.00g and dispersed in 30ml ethanol solution; using ultrasonic (10min)-intermittent (5min, pass N 2 Air) circulation mode for intermittent ultrasound for 30 minutes, the ultrasonic power is 750W, and the ultrasonic power is 750W;

[0035] b) Three cycles of vacuum: 1.00 g of NIPAm monomer and 0.05 g of BIS (crosslinking agent) were dissolved in 30 ml of deionized water, then added to a three-necked flask and vacuumed three times;

[0036] c) Selection of reaction conditions: Nitrogen gas is passed through the needle; the ultrasonic power is 750W, and ultrasonic (10min)-intermittent (5min, N) is used at 25°C 2 Gas) circulation mode for polymerization reaction, ultrasonic irradiation cumulative 2.5h;

[0037] d) Post-treatment: the product is separated, and separated by centrifugation and changing the liquid three times with ultrapure water. Freeze drying box, low temperature vacuum...

Embodiment 3

[0041] a)SiO2 2 Activation: Add nano-SiO to a 100ml three-neck flask 2 (hydroxyl content 14%) 1.00g and dispersed in 30ml ethanol solution; using ultrasonic (10min)-intermittent (5min, pass N 2 Air) circulation mode for intermittent ultrasound for 30 minutes, the ultrasonic power is 750W, and the ultrasonic power is 750W;

[0042] b) Three cycles of vacuum: 1.00g of NIPAm monomer, 0.05g of BIS (crosslinking agent) and 0.10g of NVP monomer were dissolved in 30ml of deionized water, and then added to a three-necked flask to vacuum three times;

[0043] c) Selection of reaction conditions: inject nitrogen gas through the needle; select ultrasonic power of 750W, and use ultrasonic (10min)-intermittent (5min, pass N) at 25°C 2 Gas) circulation mode for polymerization reaction, the cumulative time of ultrasonic is 2h;

[0044] d) Post-treatment: the product is separated, and separated by centrifugation and changing the liquid three times with ultrapure water. Freeze drying box, ...

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Abstract

The invention relates to a preparation method of core-shell structured particles and hollow particles. An ultrasonic method is adopted to initiate the synthesis of particles with two different core-shell structures, namely SiO2(at)PNIPAm and SiO2(at)PNIPAm / PNVP; and by HF etching, hollow particles with PNIPAm and PNIPAm / PNVP core-shell structure are obtained. The method for preparing temperature-sensitive hollow particles by the method of regulating surface polymerization progress through changing ultrasonic intermittent type ventilation mode has remarkable characteristics of adjustable core-shell structure, large-scale preparation and simple steps. Through addition of a second monomer, LCST of the hollow temperature-sensitive particles can be remarkably regulated to be close to human bodytemperature. The method of the invention has important engineering application value in micron-nano-sized particles self-assembly, drug-loaded controlled release system and responsive Pickering emulsion.

Description

technical field [0001] The invention belongs to the field of ultrasonic synthesis, and relates to a method for preparing particles with a core-shell structure and hollow particles in an ultrasonic field, in particular to SiO 2 @PNIPAm core-shell particles and SiO 2 Preparation methods of @PNIPAm / NVP core-shell particles and corresponding hollow particles. Background technique [0002] The most important role played by the ultrasonic field in the chemical reaction system is the acoustic cavitation effect, that is, a series of processes of the formation, growth, oscillation and collapse of cavitation bubble nuclei. The moment of bubble collapse can generate local high temperature and high pressure in a short time (temperature is about 5000K, pressure is about 1000bar, heat transfer rate> 1010Ks -1 ). During this process, the strong shearing action is accompanied by local high-temperature, high-pressure heat and micro-jet action, which can generate free radicals to initia...

Claims

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Application Information

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IPC IPC(8): C08J3/12C08J9/26C08F220/54C08F222/38C08F226/10
Inventor 翟薇刘强陈芳马晓燕魏炳波
Owner NORTHWESTERN POLYTECHNICAL UNIV
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