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Preparation method for core-shell structure type carbon-coated magnetic nano particles

A nanoparticle, core-shell structure technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of low product purity, poor process controllability, complex equipment, etc., and achieve dispersion Good performance, good reproducibility, and uniform particle size

Inactive Publication Date: 2015-11-11
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problems of complex equipment, poor process controllability, and low purity of the product in the process of preparing carbon-coated metal nanomaterials in the prior art.

Method used

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  • Preparation method for core-shell structure type carbon-coated magnetic nano particles
  • Preparation method for core-shell structure type carbon-coated magnetic nano particles
  • Preparation method for core-shell structure type carbon-coated magnetic nano particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Put 200mL triple-distilled water, 0.5816g nickel nitrate hexahydrate, and 0.30mL concentrated ammonia water into a 450mL hydrothermal reaction kettle in sequence, and react at 90°C for 120min to obtain Ni(OH) 2 Nanosheets. Subsequently, 6 mL of 7.2 mg / mL polyacrylic acid (PAA) surfactant was added dropwise, ultrasonically dispersed for 120 min, centrifugally washed with water, and dispersed in water. Transmission electron microscope observation shows that Ni(OH) obtained by hydrothermal method 2Nanoparticles are monodisperse regular hexagonal sheet structures with a diameter of about 90nm and a thickness of about 5nm, such as figure 1 shown.

[0037] Add 0.5mL0.908mol / L resorcinol (R) solution, 0.07mL formaldehyde (F) solution, 0.4mL dilute ammonia water to 60mLNi(OH) 2 In the dispersion liquid, the reaction was stirred at 50° C. and 400 rpm for 120 minutes. Centrifugal washing to obtain Ni(OH) 2 RF nanocomposite particles. Observation by transmission electron mic...

Embodiment 2

[0040] Put 200mL triple-distilled water, 0.5816g nickel nitrate hexahydrate, and 0.30mL concentrated ammonia water into a 450mL hydrothermal reaction kettle in sequence, and react at 90°C for 120min to obtain Ni(OH) 2 Nanosheets. Subsequently, 6 mL of 7.2 mg / mL polyacrylic acid (PAA) surfactant was added dropwise, ultrasonically dispersed for 120 min, centrifugally washed with water, and dispersed in water. Transmission electron microscope observation shows that Ni(OH) obtained by hydrothermal method 2 The nanoparticles are a monodisperse regular hexagonal sheet structure with a diameter of about 90nm and a thickness of about 5nm.

[0041] Add 0.25mL of 0.908mol / L R solution, 0.035mL of F solution, and 0.4mL of dilute ammonia to 60mL of Ni(OH) 2 In the dispersion liquid, the reaction was stirred at 50° C. and 400 rpm for 120 minutes. Centrifugal washing to obtain Ni(OH) 2 RF nanocomposite particles. Observation by transmission electron microscopy shows that the particles ...

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Abstract

The invention discloses a preparation method for core-shell structure type carbon-coated magnetic nano particles. The method comprises the following steps: preparing metal hydroxide or metal oxide nano particles having different morphologies by adopting a hydrothermal method; modifying the surfaces of the particles; coating the nano particles by adopting a similar method (described in the specification) so as to obtain phenolic resin-coated metal oxide or metal hydroxide nano composite particles; and performing calcining and carbonizing on the obtained nano composite particles to obtain the carbon-coated magnetic nano particles. The carbon-coated magnetic nano particles prepared by adopting the method disclosed by the invention are good in dispersibility, uniform in particle size and high in stability, and have graded porous core-shell structures; in the calcining process, the morphologies of the core-shell metal hydroxide or metal oxide nano particles can be kept unchanged; the particle diameters of the nano particles and the coating thickness of a carbon layer can be adjusted according to needs. The core-shell structure type composite particles prepared by adopting the method disclosed by the invention have a superpara magnetism adsorption property, and under the action of an external magnetic field, the fast separation can be realized, so that the core-shell structure type composite particles can be expected to be applied in the fields of magnetic separation and catalyzing.

Description

technical field [0001] The invention belongs to the field of preparation of functional composite materials, and relates to a method for preparing porous, core-shell structure transition metal carbon magnetic nanoparticles. Specifically, metal hydroxide or metal oxide is used as the core, and the surface is modified by a surfactant. The preparation method of carbon-coated magnetic particles is obtained by coating the phenolic resin as a carbon source and calcining it. Background technique [0002] As transition metal materials, nano-iron, cobalt, and nickel powders not only have a series of unique physical and chemical properties such as the small size effect of nanoparticles, quantum tunneling effect, magic number structure, quantum size effect, and surface effect, but also have unique Surface properties, hydrogenation catalysis, electrochemical properties, microwave absorption and ferromagnetism, etc., have great potential in the application of surface coating materials, ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30
Inventor 葛凤燕孙鸿哲蔡再生
Owner DONGHUA UNIV
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