Monodisperse magnetic nanoring as well as preparation method and application of monodisperse magnetic nanoring

A magnetic nano ring, monodisperse technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of high energy consumption and large pollution, and achieve low energy consumption and low preparation cost , good dispersion effect

Active Publication Date: 2015-06-03
ZHEJIANG NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above method prepares magnetic Fe by the chemical liquid phase reduction method. 3 o 4 The ring will not work, must undergo high temperature gas phase reduction of Fe 2 o 3 Nano ring (such as literature [NANO ACS 2009,3 (9), 2798-2808] and patent CN101264938A), so energy consumption is high; and Fe 2 o 3 Nanorings need to introduce anions (phosphate, sulfate) during the etching process, so the pollution is large

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  • Monodisperse magnetic nanoring as well as preparation method and application of monodisperse magnetic nanoring
  • Monodisperse magnetic nanoring as well as preparation method and application of monodisperse magnetic nanoring
  • Monodisperse magnetic nanoring as well as preparation method and application of monodisperse magnetic nanoring

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Embodiment 1

[0034] FeOOH nanosheets (44.5 mg), PVP (0.05 g), water (30 ml), glucose (99 mg) (the ratio of FeOOH nanosheets to glucose is 1:1) were first added to the microwave reaction vessel and stirred 15 minutes; then transferred to a microwave reactor and reacted at 180° C. for 1 hour, cooled, washed with water and ethanol by centrifugation, and finally dried to obtain the desired monodisperse magnetic nanorings. The phase of the obtained product, the morphology, structure and selected area electron diffraction pattern observed under the scanning electron microscope and transmission electron microscope are as follows Figure 1-4 As shown, it can be seen that the product is elliptical Fe 3 o 4 The polycrystalline nano ring has a long axis of 231-285nm, with an average length of 259nm; the ratio of the long axis to the short axis is 1.94-2.53, with an average of 2.15; the ratio of the inner and outer diameters of the ring is 0.71-0.80, with an average of 0.77. The particles are agglom...

Embodiment 2

[0036] The steps are the same as in Example 1, but the reaction temperature is 120°C. The morphology of the obtained product observed under the scanning electron microscope is as follows: Figure 5 As shown, it can be seen that the product is elliptical Fe 3 o 4 The polycrystalline nano ring has a long axis length of 146-227nm, with an average length of 175nm; the ratio of the long axis to the short axis is 1.86-2.51, with an average of 2.17; the ratio of the inner and outer diameters of the ring is 0.62-0.74, with an average of 0.66. The static magnetic performance test results are as follows: Figure 25 As shown, the saturation magnetization is 8.7emu g -1 , The coercivity is 31.4Oe.

Embodiment 3

[0038] The steps are the same as in Example 1, but the reaction temperature is 220° C., and the reaction time is 5 minutes. The morphology of the obtained product observed under the scanning electron microscope is as follows: Figure 6 As shown, it can be seen that the product is elliptical Fe3 o 4 The polycrystalline nano ring has a long axis length of 190-289nm, with an average length of 235nm; the ratio of the long axis to the short axis is 1.71-2.65, with an average of 2.06; the ratio of the inner and outer diameters of the ring is 0.65-0.83, with an average of 0.75. The static magnetic performance test results are as follows: Figure 25 As shown, the saturation magnetization is 47.3emu·g -1 , The coercivity is 16.7Oe.

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Abstract

The invention relates to a monodisperse magnetic nanoring as well as a preparation method and an application of the monodisperse magnetic nanoring. The magnetic nanoring has a polycrystalline structure formed through agglomeration of nanocrystalline, the shape is an elliptical shape, the length of long axis is 76-354nm, the ratio of the long axis to short axis is 1.30-2.66, diameter ratio of the long axis of the nanoring is 0-0.88, the thickness of the nanoring is 20-40nm, and the component is spinel structure Fe3O4. The magnetic nanoring is good in monodispersity and uniformity, strong in magnetic responsiveness, adjustable in size and the like. The magnetic nanoring is applied in catalysts, electrode materials, magnetic recording materials, magnetic sensors, detection, bioseparation or medical imaging. The preparation method of the magnetic nanoring adopts microwave-assisted hydrothermal-reduction-etching method or hydrothermal-reduction-etching method. The preparation method is simple in process, mild in condition, environment-friendly and energy-saving. The preparation method is applied to preparing other doped magnetic oxides or magnetic composite nanorings.

Description

technical field [0001] The invention relates to the technical field of magnetic nanometer materials, in particular to a simple method for preparing monodisperse magnetic nanorings. Background technique [0002] Annular nanostructures have unique physical and chemical properties due to their high symmetry in geometry and self-sealing in structure, such as metal rings with tunable optical properties, superconducting rings, magnetic rings with stable vortex shapes, and Bamboo shaped magnetic rings etc. These properties make them attractive for potential applications in the fields of optics, electricity, magnetism, catalysis, storage, and microwave absorption. The performance of nanorings is mainly affected by the shape, size (thickness and diameter), composition and quality of the rings. To this end, different preparation methods were used to synthesize nanorings. [0003] At present, the synthesis methods for constructing ring nanostructures mainly include physical etching ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08B82Y30/00B82Y40/00
Inventor 童国秀刘云吴文华童超丽
Owner ZHEJIANG NORMAL UNIVERSITY
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