Magnetic inorganic hollow compound microsphere and preparation method thereof

A composite microsphere and hollow technology, which can be used in inorganic pigment processing, inorganic material magnetism, chemical instruments and methods, etc., can solve the problems of time-consuming, high polyelectrolyte price, and difficulty in large-scale synthesis.

Inactive Publication Date: 2009-01-14
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its synthesis steps involve repeated wrapping and multiple centrifugation processes, making the synthesis route cumbersome and time-consuming, and the polyelectrolytes required in its synthesis are expensive and difficult to apply to large-scale synthesis
So far, there is no report (Caruso, F.; Lichtenfel

Method used

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  • Magnetic inorganic hollow compound microsphere and preparation method thereof
  • Magnetic inorganic hollow compound microsphere and preparation method thereof
  • Magnetic inorganic hollow compound microsphere and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) 0.2g superparamagnetic Fe of 10nm 3 O 4 Nanoparticles were ultrasonically dispersed into 20ml of 2M HNO 3 The magnetic nanoparticles were pretreated in the solution for 2 min, and the magnetic nanoparticles were fully washed with deionized water, and then ultrasonically dispersed into a mixed solution of 4.4 g of sodium citrate and 20 ml of deionized water. Finally, the product was separated with a magnet and dispersed in 5 ml of deionized water to obtain a stable dispersion for use.

[0018] (2) Disperse 10g of 1μm polystyrene microspheres into 300g of deionized water, then take 5g of this solution and mix with the above nanoparticle solution, and then put the mixed solution into a 35°C oven to dry. The solid obtained after drying was immersed in a mixed solution of 0.9 g of ethyl orthosilicate, 0.1 g of 2M HCl, 8 g of ethanol and 2 g of deionized water for 3 hours, and then taken out to dry. After repeating the above procedure 3 times, the obtained solid was pl...

Embodiment 2

[0020] (1) 0.2g superparamagnetic γ-Fe of 10nm 2 O 3 The nanoparticles were ultrasonically dispersed into 20 ml of 1M HCl solution for 1 min for pretreatment, and the magnetic nanoparticles were fully washed with deionized water, and then re-sonicated into a mixed solution of 4.4 g of sodium citrate and 20 ml of deionized water. Finally, the product was separated with a magnet and dispersed in 5 ml of deionized water to obtain a stable dispersion for use.

[0021] (2) 30g of 100nm polymethyl methacrylate microspheres were dispersed into 300g of deionized water, then 20g of this solution was mixed with the above-mentioned nanoparticle solution, and then the mixed solution was put into a 50° C. oven for drying. The solid obtained after drying was immersed in a mixed solution of 1.5 g of ethyl orthosilicate, 0.5 g of 2M HCl, 15 g of ethanol and 5 g of deionized water for 3 h. Remove to dry. After repeating the above steps 5 times, the obtained solid was placed in a 5 ml crucib...

Embodiment 3

[0023] (1) Ultrasonic dispersion of 0.4 g of superparamagnetic 20 nm cobalt nanoparticles into 30 mL of 2M HNO 3 The magnetic nanoparticles were pretreated in the solution for 5 min, and the magnetic nanoparticles were fully washed with deionized water, and then ultrasonically dispersed into a mixed solution of 5.0 g of sodium citrate and 30 ml of deionized water. Finally, the product was separated with a magnet and dispersed in 5 ml of deionized water to obtain a stable dispersion for use.

[0024] (2) 8g of 380nm poly(methyl methacrylate-methacrylic acid) copolymerized microspheres were dispersed in 200g of deionized water, then 5g of this solution was mixed with the above-mentioned nanoparticle solution, and then the mixed solution was put into a 45°C oven Dry in medium. The solid obtained after drying was immersed in a mixed solution of 1.8 g of zirconium isopropoxide, 0.4 g of 2M HCl, 8 g of ethanol and 6 g of deionized water for 5 h. Remove to dry. After repeating the...

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Abstract

The invention belongs to the field of advanced nanometer composite material technique, in particular to a magnetic inorganic hollow composite micro-ball and a preparation method thereof. The method of the invention comprises the steps as follows: firstly, by a solvent volatilization method, the co-deposition of magnetic nanometer particles and polymer micro-balls is generated so as to lead the magnetic nanometer particle to be filled into the gap of the polymer micro-ball; subsequently, by a nanometer pouring method, inorganic oxide sol is filled into the residual space of the polymer micro-ball gap; by inorganic oxide sol hydrolysis, the inorganic oxide enwraps the magnetic nanometer particle and covers around the polymer micro-ball; furthermore, the polymer micro-ball is removed by sintering so as to obtain the metal oxide composite hollow micro-ball with the shell doped with magnetic nanometer particles. The micro-ball can be dispersed in the water solution by supersonic oscillation. The magnetic hollow ball has stronger magnetic saturated strength and higher mechanical stability, has wide application on the aspects of biology separation, medicament transport, and catalyst load, etc. The method of the invention is simple, the raw material is easy to be obtained and the method of the invention is applicable for amplification production.

Description

technical field [0001] The invention belongs to the field of advanced nanocomposite materials and nanotechnology, in particular to a magnetic composite microsphere with a hollow structure and a synthesis method thereof. technical background [0002] In recent years, hollow microspheres have become a new type of composite material with wide application prospects due to their special structure. Hollow microspheres with walls doped with magnetic materials have broad application prospects in bioseparation, drug transport, catalytic loading, etc. [0003] So far, there have been some reports on the synthesis of magnetic hollow microspheres, but in the existing reports, the synthesized hollow microspheres have shortcomings such as poor magnetic response, uneven shape of composite materials, and poor mechanical strength. (White, S.R.; Sottos, N.R.; Geubelle, P.H.; Moore, J.S.; Kessler, M.R.; Sriram, S.R.; Brown, E.N.; Viswanathan, S.Nature 2001, 409, 794. Qiao, R.; Zhang, X.L.; Qi...

Claims

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Application Information

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IPC IPC(8): H01F1/11C09C1/24C09C3/00C08J9/24
Inventor 邓勇辉刘嘉刘翀赵东元
Owner FUDAN UNIV
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