Ferromagnetic Co3C@C core-shell nanostructure and continuous preparation method thereof

A nanostructure, ferromagnetic technology, applied in the preparation of microspheres, microcapsule preparations, etc., can solve the problems of many by-products, long time-consuming, complicated operation process, etc., and achieve the effect of strong ferromagnetism

Active Publication Date: 2012-07-04
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, some of these methods have extremely expensive equipment, complicated operation process, long time-consuming, and many by-products, etc.
Currently, the simple and effective Co 3 The preparation of C-coated carbon onion or graphitic carbon remains a great challenge

Method used

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  • Ferromagnetic Co3C@C core-shell nanostructure and continuous preparation method thereof
  • Ferromagnetic Co3C@C core-shell nanostructure and continuous preparation method thereof
  • Ferromagnetic Co3C@C core-shell nanostructure and continuous preparation method thereof

Examples

Experimental program
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Embodiment 1

[0023] Example 1: Ferromagnetic Co 3 A continuous preparation method for CC core-shell nanostructures, comprising the following steps:

[0024] Polish the surface of the Co simple target material with fine sandpaper first, put it into ethanol and acetone solutions for ultrasonic cleaning for 10 minutes each, and then fix it on the support of the rotary table, slowly inject acetone liquid and keep the liquid phase laser ablation cavity. Acetone liquid is 20ml, Nd:YAG pulse laser is used, the wavelength is 1064nm, the energy is 100mJ, ablation of Co single substance target for 5-8h, to obtain Co 3 CC core-shell nanostructures.

Embodiment 2

[0025] Example 2: Co 3 Schematic diagram of the continuous preparation principle of CC core-shell nanostructures, such as figure 1 As shown, the surface of the metal Co target is first polished with fine sandpaper, put into ethanol and acetone solutions for ultrasonic cleaning for 10 minutes each, and then fixed on the support of the rotary table, start the small pump and slowly inject the acetone liquid and maintain the liquid phase The acetone liquid in the laser ablation cavity is 20ml, using a Nd:YAG solid-state laser with a pulse of 10ns, a wavelength of 1064nm, and an energy of 100mJ, through a focusing lens to vertically incident on the surface of the Co target, so that the diameter of the focused spot is 1mm, and the The rotary table rotates continuously to perform continuous liquid-phase laser ablation. When the acetone solution flows into the large container, the product with strong ferromagnetism is adsorbed on the wall of the container by the magnet. The acetone so...

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Abstract

The invention discloses a ferromagnetic Co3C@C core-shell nanostructure and a continuous preparation method thereof. The preparation method comprises the steps of sanding the surface of Co elementary substance target with fine abrasive paper until the surface is clean, sequentially ultrasonically cleaning in ethanol solution and acetone solution (each for 8-12min), fixing on a frame of a rotating table, slowly injecting acetone solution and keeping the volume of the acetone solution in a liquid phase laser ablation cavity at 17-25ml, and obtaining Co3C@C core-shell nanostructure by adopting Nd:YAG pulse laser with wavelength of 1064nm and energy of 95-105mJ, and ablating the Co elementary substance target to obtain Co3C@C core-shell nanostructure. The Co3C@C core-shell nanostructure can be continuously prepared for 5-8h. The Co3C@C core-shell nanostructure prepared by the method of the invention has the characteristics of stronger ferromagnetism and fluorescence luminescence dependent on excitation wavelength, and has potential application prospects in magnetic recording and biological medicine.

Description

technical field [0001] The invention relates to a liquid phase laser ablation technology, in particular to a ferromagnetic Co 3 CC core-shell nanostructures and their continuous fabrication method. Background technique [0002] co 3 C is a metastable structure based on the direct bonding of Co elements and C elements, which makes it have very important properties in magnetism, physics, and thermodynamics. Among the iron group carbides, due to its strong catalytic properties, ferromagnetism at room temperature and application in thin films, Co 3 C has great research potential and application value. Magnetic nanoparticles coated with carbon onion or graphitic carbon have attracted widespread attention because they have high temperature oxidation resistance, acid corrosion resistance, not easy to agglomerate, and easy surface functionalization, which can be widely used in various fields, such as Magnetic data storage, high-contrast magnetic resonance imaging, applications i...

Claims

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Application Information

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IPC IPC(8): B01J13/02
Inventor 梁长浩张和民刘俊田振飞
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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