Magnetic polymer/carbon-based microsphere material with core-shell structure and preparation method thereof

A technology of core-shell structure and carbon-based microspheres, which is applied in the direction of magnetic materials, microsphere preparation, magnetic objects, etc., can solve the problems of difficult separation and recycling, difficulty in controlling the thickness of the shell layer, and cumbersome preparation steps, etc. Easy control of layer thickness, strong magnetic response, simple and rapid method

Active Publication Date: 2014-03-26
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the preparation of magnetic carbon-based materials disclosed in the prior art, most of the magnetic carbon-based materials use sugars such as glucose and sucrose as carbon sources (Shouhu Xuan, Lingyun Hao, Wanquan Jiang, Xinglong Gong, YuanHu and Zuyao Chen. Nanotechnology 2007,18,035602), the synthesis of magnetic carbon-based materials was realized by hydrothermal synthesis, and the obtained composite materials had the following defects and deficiencies: easy adhesion, inhomogeneity, poor dispersion, difficulty in controlling the thickness of the wrapped shell, wrapping thinner, etc.
Some studies have reported the preparation of hollow carbon sphere materials (An-Hui Lu, *Tao Sun, Wen-Cui Li, Qiang Sun, Fei Han, Dong-Hai Liu, and Yue Guo.Angew.Chem.Int.Ed.2011 , 50, 11765-11768; An-Hui Lu, *Wen-Cui Li, Guang-Ping Hao, Bernd Spliethoff, Hans-Jo

Method used

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  • Magnetic polymer/carbon-based microsphere material with core-shell structure and preparation method thereof

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Effect test

Embodiment 1

[0025] 0.1g magnetic Fe with a particle size of 250nm 3 o 4 Ultrasonic dispersion of nanoparticles into 40ml ethanol and water mixed solvent (ethanol: water = 2:1), then add concentrated ammonia water (1.25ml, 28wt%), mechanically stir at room temperature for 10min, add 0.2g resorcinol, stir for 10min , add 0.28ml formaldehyde solution. Continue to stir for 2h, separate it from the solution by a magnet, wash it repeatedly with ethanol and distilled water successively, and dry at room temperature to obtain magnetic phenolic resin microspheres; place the microspheres in nitrogen to roast at a heating rate of 1°C / min, Rise to 600 ° C, and obtain core-shell magnetic carbon spheres after roasting for 5 h.

Embodiment 2

[0027] 0.15g of magnetic nanoparticles γ-Fe with a particle size of 50nm 2 o 3Ultrasonic dispersion into 50ml ethanol and water mixed solvent (ethanol: water = 1:1), then add NaOH (0.5ml, 1M), mechanically stir at room temperature for 10min, add 0.2g resorcinol, stir for 10min, add 0.02g Hexamethylenetetramine, continue to stir for 4h, separate it from the solution by a magnet, wash it repeatedly with ethanol and distilled water, and dry at room temperature to obtain magnetic phenolic resin microspheres, place the microspheres in nitrogen to roast, and heat up The rate was 1°C / min, raised to 600°C, and the core-shell magnetic carbon spheres were obtained after roasting for 5h.

Embodiment 3

[0029] 0.18g magnetic NiFe with a particle size of 340nm 2 o 4 Ultrasonic dispersion of nanoparticles into 35ml ethanol and water mixed solvent (ethanol: water = 2:1), then add KOH (0.2ml, 2M), mechanically stir at room temperature for 10min, add 0.2g melamine, after stirring for 10min, add 0.28 ml formaldehyde, continue to stir for 10 minutes, add 0.5ml of F127 solution (6.4wt%), continue to stir for 4 hours, separate it from the solution by a magnet, wash repeatedly with ethanol and distilled water, and dry at room temperature to obtain magnetic melamine resin microspheres, The microspheres were roasted in nitrogen at a heating rate of 1 °C / min to 600 °C, and core-shell magnetic carbon spheres were obtained after roasting for 5 h.

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Abstract

The invention belongs to the field of advanced nano composite materials, and relates to a magnetic polymer/carbon-based microsphere material with a core-shell structure and a preparation method thereof. The preparation method comprises the steps of: by adopting a sol-gel chemical synthesis method, in an alcohol water phase, in the presence of an alkali catalyst, wrapping polymer resin macromolecule layer outside a magnetic nano particle to obtain a magnetic macromolecule microsphere with a core-shell structure, carbonizing the polymer resin macromolecule layer through high temperature roasting to obtain a magnetic carbon-based microsphere material with the core-shell structure; adding a macromolecule surfactant during preparation, removing a surfactant by carbonizing through roasting to obtain a magnetic carbon-based microsphere material with a cavity, which is of a core-shell structure. The composite microsphere has stronger magnetic responsiveness, and the surface of the composite microsphere can be further functionalized and a large quantity of hydrophobic substances are absorbed; the magnetic microsphere material with the cavity, which is of a core-shell structure, can be used in a nano reactor, drug sustained release, and large-capacity adsorption and separation. The preparation method is simple, is easily available in raw materials, and suitable for amplified production.

Description

technical field [0001] The invention belongs to the field of advanced nanocomposite materials and nanotechnology, and specifically relates to a magnetic polymer / carbon-based microsphere material with a core-shell structure and a preparation method thereof. Background technique [0002] In recent years, core-shell composite microspheres have become a new type of composite material with broad application prospects because they can simultaneously utilize the advantages of their core and shell layers. According to research reports, composite microspheres that use magnetic materials as the core layer and polymeric polymers or carbon as the shell layer, because they combine the magnetic responsiveness of magnetic materials and the characteristics of easy functionalization of polymeric polymers or carbon shells Hydrophobicity has broad application prospects in adsorption, separation, catalysis, etc. Among them, the magnetic core-shell microsphere material with a cavity structure ca...

Claims

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Application Information

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IPC IPC(8): B01J13/02H01F1/00
Inventor 邓勇辉岳秦王子龙
Owner FUDAN UNIV
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