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Ni-Zn ferrite/SiO2 composite nano-fiber and preparation method thereof

A composite nanofiber, nanofiber technology, applied in fiber processing, spinning solution preparation, fiber chemical characteristics, etc., can solve the problems of thin, light, wide, strong, low ferrite saturation magnetization, and wave absorption frequency narrow and other problems, to achieve the effect of easy control of the reaction process, controllable electromagnetic performance, and low duty cycle

Inactive Publication Date: 2012-08-15
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when ferrite powder is used as an electromagnetic wave absorber, there are disadvantages such as large surface density, low frequency of use, and narrow absorption frequency band; in addition, due to the small saturation magnetization of ferrite, its Snoek limit It is also small, and it is impossible to obtain absorbers with high magnetic permeability and high magnetic loss at high frequencies
Therefore, as far as pure ferrite powder is concerned, it can no longer meet the requirements of "thin, light, wide and strong" proposed in the fields of modern stealth, electromagnetic shielding and anti-electromagnetic interference technology.

Method used

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  • Ni-Zn ferrite/SiO2 composite nano-fiber and preparation method thereof
  • Ni-Zn ferrite/SiO2 composite nano-fiber and preparation method thereof
  • Ni-Zn ferrite/SiO2 composite nano-fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 [(Ni 0.5 Zn 0.5 Fe 2 o 4 ) 97.5 (SiO 2 ) 2.5 Composite nanofibers, synthesis temperature 900°C]

[0028] Step 1: Dissolve 0.9407g polyvinylpyrrolidone (PVP) in 9.0593g absolute ethanol (CH 3 CH 2 OH, analytically pure) and 4.0000g of deionized water in a mixed solvent, and magnetic stirring at room temperature for about 1h to completely dissolve the PVP. Then weigh 1.2928g iron nitrate (Fe(NO 3 ) 3 9H 2 O, analytically pure), 0.1990g nickel acetate (Ni(CH 3 COO) 2 4H 2 O, analytically pure), 0.1756g zinc acetate (Zn(CH 3 COO) 2 2H 2 (2, analytically pure) and 0.0338g tetraethyl orthosilicate (TEOS, analytically pure) were added in the above-mentioned PVP solution, then continued magnetic stirring for about 20h to obtain a homogeneous precursor solution, wherein the concentration of PVP was 6wt%. The concentration of the metal salt was 10.6 wt%.

[0029] Step 2: Control the relative humidity and temperature in the room below 65% and within the...

Embodiment 2

[0031] Embodiment 2 [(Ni 0.5 Zn 0.5 Fe 2 o 4 ) 95 (SiO 2 ) 5 Composite nanofibers, synthesis temperature 900°C]

[0032] Step 1: Dissolve 1.8000g of PVP in a mixed solvent composed of 8.7313g of absolute ethanol and 4.0000g of deionized water, and stir magnetically at room temperature for about 1 hour to completely dissolve the PVP. Then weigh 0.3489g ferric nitrate, 0.0537g nickel acetate, 00474g zinc acetate and 0.0187g tetraethyl orthosilicate according to the chemical composition of the target fiber and add them to the above PVP solution, and then continue magnetic stirring for about 20h to obtain a homogeneous precursor Body solution, wherein the concentration of PVP is 12wt%, and the concentration of metal salt is 3wt%.

[0033] Step 2 is basically the same as Step 2 of Example 1, except that the spinning electric field intensity is adjusted to 1.5kV / cm.

[0034] Step 3: Place the dried precursor fiber in a programmable electric furnace, raise the temperature to ...

Embodiment 3

[0035] Embodiment 3 [(Ni 0.5 Zn 0.5 Fe 2 o 4 ) 90 (SiO 2 ) 10 Composite nanofibers, the synthesis temperature is 900°C]

[0036] Step 1: Dissolve 0.9488g of PVP in a mixed solvent composed of 9.0512g of absolute ethanol and 4.0000g of deionized water, and magnetically stir at room temperature for about 1 hour to completely dissolve the PVP. Then weigh 1.2928g ferric nitrate, 0.1990g nickel acetate, 0.1756g zinc acetate and 0.1466g tetraethyl orthosilicate according to the chemical composition of the target fiber and add them to the above PVP solution, then continue magnetic stirring for about 20h to obtain a uniform composition. Precursor solution, wherein the concentration of PVP is 6wt%, and the concentration of metal salt is 10.5wt%.

[0037] Step 2 is the same as Step 2 of Example 1.

[0038] Step 3: Place the dried precursor fiber in a programmable electric furnace, raise the temperature to 900°C at a rate of 3°C / min and keep it warm for 2 hours. After cooling to ...

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Abstract

The invention discloses a Ni-Zn ferrite / SiO2 composite nano-fiber and a preparation method thereof, belonging to the field of inorganic non-metal composite functional materials and the preparation thereof. In the preparation method, PVP (Polyvinylpyrrolidone) is taken as a complexing agent to react with nickel acetate, zinc acetate, ferric nitrate and tetraethoxysilane so as to prepare a precursor solution. Precursor fibers are prepared by an electrostatic spinning technique firstly; and then, the obtained precursor fibers are dried and roasted at a proper temperature to prepare NiO.5Zn0.5Fe2O4 / SiO2 composite nano-fiber, wherein the SiO2 exists in an amorphous form. The invention has the advantages of wide raw material source, easily controlled reaction process, simple technique, convenient operation and the like by adopting the technique solution of the invention to prepare the required target products; in addition, the invention can conveniently control the microstructure and appearance of the products by regulating process factors and chemical components so as to realize the controllability on the electromagnetism thereof. The preparation method is also applied to the preparation of other magnetic composite nano-fiber materials.

Description

technical field [0001] The invention relates to the field of inorganic non-metallic composite functional materials, in particular to a spinel ferrite / silicon dioxide composite nanofiber and a preparation method thereof. Background technique [0002] With the rapid development of information technology, electromagnetic waves in the microwave frequency band have been more and more widely used in the industrial field. This brings a lot of electromagnetic pollution and electromagnetic interference, which not only leads to a large number of system failures, but also seriously endangers human health. In order to overcome the harm caused by electromagnetic pollution and electromagnetic interference, microwave-absorbing materials have been extensively studied and applied. At the same time, in the military field, wave-absorbing materials can effectively reduce the radar wave emission cross section of weapons and equipment, realize radar stealth, and improve the survivability and pen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/10D01D1/02D01D5/00D01D10/02H01F1/12
Inventor 向军沈湘黔宋福展刘明权
Owner JIANGSU UNIV
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