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Magnetic particles preparation method by using nanometer spherical polyelectrolyte brush as micro-reactor

A technology of polyelectrolyte brushes and microreactors, which can be applied to magnetic materials, magnetic objects, circuits, etc., and can solve problems such as application limitations

Inactive Publication Date: 2010-01-20
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface modification changes the properties of the nanoparticle body, especially the surface characteristics, which may limit its application.

Method used

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  • Magnetic particles preparation method by using nanometer spherical polyelectrolyte brush as micro-reactor
  • Magnetic particles preparation method by using nanometer spherical polyelectrolyte brush as micro-reactor
  • Magnetic particles preparation method by using nanometer spherical polyelectrolyte brush as micro-reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 miniemulsion polymerization prepares spherical polyelectrolyte brush inner core

[0026] Mix 0.40 g of n-hexadecane, 0.30 g of azobisisobutyronitrile and 10.0 g of styrene monomer into deionized water dissolved with 0.12 g of sodium dodecylsulfonate, and ultrasonically pre-emulsify in an ice bath for 2 After 2 hours of fine emulsification, the temperature was raised to 65° C. under a nitrogen atmosphere, the stirring rate was controlled at 400 rpm, and the polymerization reaction was carried out for 3 hours to obtain a spherical polyelectrolyte brush inner core.

Embodiment 2

[0027] Embodiment 2 Schotten-Baumann reaction prepares photoinitiator HMEM

[0028] Pour 30.0g of photoinitiator HMP into a 500ml single-necked flask, add 150ml of acetone, stir until HMP is completely dissolved, then add 10g of newly purified pyridine, continue stirring at low temperature, and then add 13.6g of methacryloyl chloride (MC ) was dissolved in 50ml of acetone, and slowly added dropwise to the reaction flask, after the dropwise addition, it was reacted at room temperature for 12 hours to obtain an orange-yellow liquid, which was filtered to remove the beige precipitate at the bottom, and pure HMEM photoinitiated by chromatographic separation agent.

Embodiment 3

[0029] Embodiment 3 prepares the spherical polyelectrolyte brush inner core that photoinitiator coats

[0030] At the end of the miniemulsion polymerization reaction in Example 1, slowly add 1g of photoinitiator HMEM dropwise to the reaction system, and the rate of addition is controlled at 10 drops / minute; after the addition is completed, react for 3 hours; obtain the photoinitiator-coated Spherical polyelectrolyte brush inner core, dynamic light scattering (DLS) characterization results show that the hydrodynamic diameter of the spherical polyelectrolyte brush inner core is 190nm.

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Abstract

The invention relates a magnetic particles preparation method by using nanometer spherical polyelectrolyte brush as micro-reactor, comprising the following four steps: step 1, obtaining 80-200nm of polymer microspheres by miniemulsion polymerization method; step 2, adding a photoinitiator in the final phase of miniemulsion polymerization to coat the surface of polymer microspheres and form a photoinitiator layer; step 3, initiating polyelectrolyte monomer polymerization with a ultraviolet lamp in a light reactor to obtain 100-350nm of spherical polyelectrolyte brush; step 4, adding ferrous salt and ferric salt in the spherical polyelectrolyte brush emulsion system to react in situ and prepare magnetic particles under the action of coprecipitator and finally obtaining 3-5nm of magnetic nanoparticles evenly distributed inside the spherical polyelectrolyte brush. The nanometer magnetic composite microspheres can have wide application in the fields of high effective catalyst, water purification, biomedicine and the like.

Description

technical field [0001] The present invention relates to the preparation method of magnetic particle, specifically is to utilize the method for miniemulsion polymerization and photoemulsion polymerization to prepare spherical polyelectrolyte brush first, then utilize spherical polyelectrolyte brush as microreactor to prepare magnetic particle by reverse co-precipitation method, And apply it to the fields of high-efficiency catalyst, water purification and biomedicine. Background technique [0002] When charged linear polymer chains are densely distributed on the surface of a spherical substrate with one end fixed, due to volume repulsion and electrostatic repulsion, the free ends of the polymer chains will stretch outward, forming a spherical polyelectrolyte brush. Structure. Due to its special structure, the spherical polyelectrolyte brush greatly strengthens the Donnan effect of polyelectrolyte enriching counter ions, which can absorb and concentrate counter ions, and this...

Claims

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Application Information

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IPC IPC(8): H01F1/00C08F285/00C08F257/02C08F265/04C08F2/48
Inventor 郭旭虹朱雁李莉陈凯敏房鼎业
Owner EAST CHINA UNIV OF SCI & TECH
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