Magnetic ball chain and preparation method thereof

A ball chain and magnetic technology, applied in the nanometer field, can solve the problems of long reaction cycle, complex multi-steps, high cost, etc., and achieve the effects of controllable size and composition, low preparation cost and good dispersion

Active Publication Date: 2017-12-22
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned template method cannot be widely used due to complex multi-steps, long reaction cycle, low yield and high cost.

Method used

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  • Magnetic ball chain and preparation method thereof
  • Magnetic ball chain and preparation method thereof
  • Magnetic ball chain and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 5mmol FeCl 3 ·6H 2 0, 40mL ethylene glycol, 0.5g polyethylene glycol (that is, the massfraction of surfactant is 0.0125 grams per milliliter) was added in the inner liner of polytetrafluoroethylene, magnetically stirred for 30 minutes; then 10mmol ethylenediamine ( The ratio of the amount of ethylenediamine to the metal salt is 2.0) into the lining and mix and stir for 2.0h; finally put the lining into a stainless steel kettle, and place 2 high-temperature powerful magnets on the bottom or top of the lining, React at 220°C for 12 hours, cool down and wash by centrifugation (first, wash with water and ethanol three times, centrifuge at a speed of 1500 rpm, and centrifuge for 5 minutes), finally separate and wash with water and ethanol by magnetic separation, until the solution is clear, and dry at 60°C 6h to obtain the required hollow magnetic ball chain. The phase of the resulting product, the structure observed under the scanning electron microscope and the morpholog...

Embodiment 2

[0038] Same as Example 1 step, but the reaction time is 6 hours, and the morphology of the obtained product observed under the scanning electron microscope is as follows: Figure 4 As shown, the particle diameter is 1.14-1.37 μm, the chain length is 7.50-11.30 μm, and the aspect ratio is 5.5-9.9.

Embodiment 3

[0040] Same as Example 1 step, but the reaction time is 8 hours, and the morphology of the obtained product observed under the scanning electron microscope is as follows: Figure 5 As shown, the particle diameter is 1.10-1.24 μm, the chain length is 3.65-5.39 μm, and the aspect ratio is 2.9-4.9.

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Abstract

The invention discloses a magnetic ball chain and a preparation method thereof. The component of the magnetic ball chain is spinel type ferrite and is of a one-dimensional hollow or porous chain structure, the diameter is 0.24-1.60 micrometers, the chain length is 1.25-11.3 micrometers, the length-diameter ratio is 1.23-10.2, and the specific surface area is 1.42-57.8 m<2>.g<-1>. The magnetic ball chain is prepared by adopting a magnetic field induction solvent hot method, particularly, metal salt, a surface active agent and ethylene glycol are stirred in a lining of polytetrafluoroethylene, ethidene diamine is added into the lining, the mixture is mixed and stirred for 1-2 h, the lining is placed into a stainless steel kettle, 1-2 high-temperature powerful magnets are placed on the bottom or top of the lining, a reaction is performed for 6-24 h at the temperature of 210-240 DEG C, water and ethyl alcohol are used for centrifugal and magnetic separation and washing after cooling, and finally drying is performed. The raw materials are cheap and easy to obtain, and the magnetic ball chain is low in cost, simple in technology, high in efficiency and easy to popularize. The magnetic ball chain has the advantages that the size and composition are adjustable and the like, and can be applied to magneto-rheological, magnetic separation, catalysis, electrode materials, microwave absorption and high-density magnetic recording materials.

Description

technical field [0001] The invention relates to the field of nanotechnology, in particular to a simple method for preparing hollow or porous magnetic ferrite ball chains. Background technique [0002] Spinel ferrite is an important class of soft magnetic functional materials, widely used in information storage systems, catalysis, spintronic devices, microwave absorption, various magnetic devices and communication equipment. Size, morphology, and composition are key factors that regulate the properties of nanomaterials. In recent years, one-dimensional (such as wires, rods, ribbons, and tubes) porous nanomaterials have attracted extensive attention due to their special shape anisotropy, high specific surface area, and porous structure. The main preparation method of hollow ferrite is the template method, that is, the hard template (SiO 2 , carbon spheres, PS) or soft templating agent (microemulsion, air bubbles) as a template, using surface precipitation or layer-by-layer s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00
CPCC01G49/0018C01G49/0072C01G49/0081C01P2002/72C01P2004/03C01P2004/04C01P2004/10C01P2004/61C01P2006/12C01P2006/42
Inventor 童国秀李亚娜赵彦婷金可英蒋科丹钱纳新林建军吴文华
Owner ZHEJIANG NORMAL UNIVERSITY
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