A method for preparing hollow/mesoporous nanostructured materials by modulating the Kirkendall effect with a magnetic field

A technology of nanostructure and magnetic field modulation, applied in the field of nanometers, can solve problems such as increasing commercial preparation costs, and achieve the effects of reducing reaction preparation costs, shortening conversion time, and huge benefit value

Active Publication Date: 2020-04-03
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

This undoubtedly increases the cost of commercial preparation

Method used

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  • A method for preparing hollow/mesoporous nanostructured materials by modulating the Kirkendall effect with a magnetic field
  • A method for preparing hollow/mesoporous nanostructured materials by modulating the Kirkendall effect with a magnetic field
  • A method for preparing hollow/mesoporous nanostructured materials by modulating the Kirkendall effect with a magnetic field

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Embodiment

[0024] First, silicon nanoparticles are partially oxidized in a tube furnace at 800°C under an air atmosphere to form a thin oxide layer on the surface of silicon nanoparticles, and the partially oxidized silicon nanoparticles are obtained as precursors for hydrothermal reactions. Then, the partially oxidized silicon nanoparticles are uniformly dispersed in deionized water by ultrasonic treatment, added into a stainless steel autoclave with a polytetrafluoroethylene substrate, sealed after packaging, and then the stainless steel autoclave is put into a heater Finally, the heater equipped with a stainless steel autoclave was placed in a steady-state magnetic field at 1T for a hydrothermal reaction at 180°C for 5 hours, and the same precursor solution was prepared and reacted for 5 hours and 24 hours respectively without a magnetic field. TEM test was carried out, and the results were as follows image 3 shown.

[0025] image 3 is a transmission electron microscope (TEM) pict...

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Abstract

The invention discloses a method for preparing a hollow / mesoporous nano structure material by adjusting the Kirkendall effect through a magnetic field. In the process that a hollow / mesoporous nano structure material is prepared through the Kirkendall effect, a hydrothermal reaction step is implemented under an external magnetic field condition. Due to an external magnetic field, the time that a solid nano structure material is transformed into the hollow / mesoporous nano structure material is greatly shortened at a relatively low temperature by virtue of the Kirkendall effect, so that great benefit values are made since the reaction preparation cost is reduced, and current development themes of energy conservation and environment protection are met.

Description

technical field [0001] The invention relates to the field of nanotechnology, in particular to a method for preparing a hollow / mesoporous nanostructure material by modulating the Kirkendall effect with a magnetic field. Background technique [0002] The Kirkendall effect is a classic method for the synthesis of hollow / mesoporous nanostructures, and is widely used in the synthesis of various nanohollow / mesoporous spheres. Various hollow nanostructures synthesized by this method are widely used in nanocatalysts, nanoreactors, drug delivery, electrode materials, optical materials and other neighborhoods. The current preparation of this method generally requires high temperature and long-term reaction. This undoubtedly increases the cost of commercial preparation. As a thermodynamic parameter similar to temperature and pressure, the magnetic field has an important influence on a large number of physical and chemical processes. Moreover, the effect of the magnetic field on the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/02B82Y40/00
CPCB82Y40/00C01B33/02C01P2004/04C01P2004/62C01P2004/64
Inventor 盛志高卞跃成丁伟胡林
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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