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New method for preventing nano particles from re-agglomerating during rapid expansion of supercritical fluid

A supercritical fluid, nanoparticle technology, applied in the direction of solution crystallization, etc., to achieve the effect of simple operation, prevention of re-agglomeration, and easy industrialization

Inactive Publication Date: 2013-12-04
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of re-agglomeration of nanoparticles, the present invention provides a method for the instantaneous release of supercritical fluid so that the small organic molecules moving with the air flow are precipitated by supersaturated solid particles to wrap the nanoparticles, so as to prevent the re-agglomeration of nanoparticles. How to deal with the reunion

Method used

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  • New method for preventing nano particles from re-agglomerating during rapid expansion of supercritical fluid
  • New method for preventing nano particles from re-agglomerating during rapid expansion of supercritical fluid
  • New method for preventing nano particles from re-agglomerating during rapid expansion of supercritical fluid

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Embodiment 1

[0025] Weigh a certain amount of multi-walled carbon nanotubes and dimethyl isophthalate into a 1-500ml reactor. Connect the reaction device, check the air tightness, use CO 2 Remove the air in the reactor, and then adjust the temperature to a temperature of 0-600°C or higher. Will CO 2 Pass into the reactor, pressurize to 0-30MPa or even higher, and mix for 0-300min or even longer. The mixed supercritical system is quickly sprayed into the container through a fine nozzle for collection, and after cooling, the sample is taken out.

[0026] The dispersion of the two types of multi-walled carbon nanotubes was observed through scanning electron micrographs. figure 1 , figure 2 These are scanning electron micrographs of multi-walled carbon nanotubes that do not contain dimethyl isophthalate during RESS treatment and multi-walled carbon nanotubes that do not contain dimethyl isophthalate during RESS treatment. By comparison, we found that dimethyl isophthalate has wrapped the multi-...

Embodiment 2

[0028] Weigh a certain amount of single-walled carbon nanotubes and dimethyl isophthalate into a 1-500ml reactor. Connect the reaction device, check the air tightness, use CO 2 Remove the air in the reactor, and then adjust the temperature to a temperature of 0-600°C or higher. Will CO 2 Pass into the reactor, pressurize to 0-30MPa or even higher, and mix for 0-300min or even longer. The mixed supercritical system is quickly sprayed into the container through a fine nozzle for collection, and after cooling, the sample is taken out.

[0029] The dispersion of the two types of single-walled carbon nanotubes was observed through scanning electron micrographs. figure 1 , figure 2 These are scanning electron micrographs of single-walled carbon nanotubes that do not contain dimethyl isophthalate during RESS treatment and single-walled carbon nanotubes that do not contain dimethyl isophthalate during RESS treatment. By comparison, we found that dimethyl isophthalate has wrapped the si...

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Abstract

The invention provides a treatment method for preventing nano particles from re-agglomerating. The treatment method is characterized in that the RESS technology is adopted, and the suspending liquid containing both the nano particles and dissolved small organic molecules of supercritical fluid is directly sprayed to a container through spray microtubes and collected. Due to the instantaneous release of the supercritical fluid, the small organic molecules moving with the airflow are supersaturated to separate out solid particles, and the solid particles deposit and grow on the scattered nano particles to form a layer of film on each nano particle, so as to prevent the nano particles from re-agglomerating. The treatment method has the advantages that no volatile organic compound is needed, the operation is simple, the structures of the nano particles are not damaged, and industrialization is facilitated. The treatment method has a good effect and a high practical value in preventing nano particles from re-agglomerating.

Description

1. Technical Field [0001] The invention provides a treatment method for preventing the re-agglomeration of the nanoparticles by causing the organic small molecules moving with the airflow to be supersaturated due to supersaturation at the moment when the supercritical fluid is released. field. 2. Technical background [0002] Nanoparticles with special properties such as quantum size effect, small size effect, surface effect and macro quantum tunneling effect have great scientific value and a broad market in catalysis, light filtering, light absorption, medicine, magnetic media and new materials. The prospects have attracted great attention worldwide, and scientific researchers from various countries have conducted a lot of research. [0003] The re-aggregation of nanoparticles is a key problem that limits the application of nanoparticles. In order to solve this problem, people have done a lot of research work. Such as washing with organic matter, adding dispersant, etc. to phys...

Claims

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Application Information

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IPC IPC(8): B01D9/02
Inventor 赵健喻慧刘振生
Owner QINGDAO UNIV OF SCI & TECH
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