A ferrite material and method for preparing same

A ferrite material and ferrite technology, applied in the field of materials, can solve the problems of not disclosing the composition range of magnetic composite materials

Inactive Publication Date: 2008-04-16
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • A ferrite material and method for preparing same
  • A ferrite material and method for preparing same
  • A ferrite material and method for preparing same

Examples

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Embodiment 1

[0023] Example 1. ZnGd with a Curie temperature of 43-45°C 0.02 Fe 1.98 o 4 Preparation of ferrite

[0024]Measure 50mL of zinc chloride aqueous solution with a concentration of 0.1mol / L, 99mL of an aqueous solution of ferric chloride with a concentration of 0.1mol / L, and 1mL of an aqueous solution of gadolinium chloride with a concentration of 0.1mol / L to make a uniform mixed solution, and quickly add it to In 50 mL of sodium hydroxide solution with a concentration of 5 mol / L, under stirring at a speed of 180 rpm, the reaction temperature was kept at 90°C. After 1 hour of reaction, the gel-like precipitated product was placed in ice water to be quenched, and then The precipitated product was repeatedly washed with deionized water until neutral (pH=7), filtered through filter paper, and freeze-dried at -48°C for 5 hours to make gadolinium-containing ferrite powder. The zinc oxide content in its chemical composition was 20wt %, the content of iron oxide is 78wt%, and the con...

Embodiment 2

[0025] Embodiment 2. Curie temperature is ZnGd of 5~7 ℃ 0.01 Fe 1.99 o 4 Preparation of ferrite

[0026] Measure 50mL of zinc sulfate aqueous solution with concentration of 0.1mol / L, 99.5mL of ferric sulfate aqueous solution of 0.1mol / L, and 0.5mL of gadolinium nitrate aqueous solution of 0.1mol / L to make a uniform mixed solution, and quickly add it to a concentration of 5mol / L of 50mL potassium hydroxide solution, under the stirring speed of 180 rpm, keep the reaction temperature at 90°C, after 1h of reaction, place the gel-like precipitated product in ice water to quench, centrifuge to obtain the precipitated product, Then the precipitated product was repeatedly washed with deionized water to neutrality (pH=7), filtered, and freeze-dried at -48°C for 5 hours to make zinc-gadolinium ferrite powder with a Curie temperature of 5-7°C. The chemical composition The zinc oxide content in the medium is 20wt%, the iron oxide content is 79wt%, and the gadolinium oxide content is 1...

Embodiment 3

[0027] Example 3. ZnGd with a Curie temperature of 120°C 0.1 Fe 1.9 o 4 Preparation of ferrite

[0028] Measure 50mL of zinc nitrate aqueous solution with a concentration of 0.1mol / L, 90mL of an aqueous solution of ferric nitrate with a concentration of 0.1mol / L, and 10mL of an aqueous solution of gadolinium nitrate with a concentration of 0.1mol / L to make a uniform mixed solution, and quickly add to the concentration of In 50mL potassium hydroxide solution of 5mol / L, keep the reaction temperature at 90°C under stirring at a rotation speed of 180 rpm. After 1 hour of reaction, place the gel-like precipitated product in ice water to quench and centrifuge to obtain the precipitate product, and then the precipitated product was repeatedly washed with deionized water to neutrality, filtered, and freeze-dried at -48°C for 5 hours to make zinc-gadolinium ferrite micropowder with a Curie temperature of 120°C for tumor magnetic hyperthermia, particle size 10-30nm (for powder morpho...

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Abstract

The invention relates to a method for manufacturing special ferrite material capable of automatically control the temperature by the combination of coprecipitation and freeze-dry for preparing. The ferrite material of the invention differs form the average ferrites in that the constitute comprises lanthanon gadolinium besides zinc, iron, oxygen, the content of zinc oxide in chemical composition is between 17 and 23wt percent, the content of ferric oxide is between 68 and 88wt percent, and the content of gadolinium oxide is between 0 and 9wt percent. The size of the particle made of the material produced by the method is between 10 and 30nm, the Curie temperature (Tc) can be adjusted between minus 10 DEG C and 120 DEG C, the specific absorption rate (SAR) of the material is between 3.1 and 10.8W/g under the action of an alternating magnetic field generator with 8kW rating power when the working frequency is set at 60kHz and the strength of the magnetic field is set between 6.5 and 7 kA/m. The powder body of the ferrite takes on a ferromagnetic phase at the room temperature, becomes a heating element under the action of external alternating magnetic field, can raise self-temperature to the corresponding Curie temperature; when the temperature of the powder body exceeds the temperature, the material is conversed from the ferromagnetic phase to a paramagnetic phase and can not heat any more. The temperature of the powder body decreases due to natural cooling, when the temperature is lower than the Curie temperature, the powder body gets back to the ferromagnetic phase, becomes the heating element and raises the self-temperature. With the circulation, the temperature of the powder body can be controlled within the Curie temperature.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a special ferrite material capable of automatic temperature control that can be used for tumor treatment and a preparation method thereof. Background technique [0002] Ferrite is a new type of non-metallic material, a typical soft magnetic material, since the 1930s, it has been widely used in communications, broadcasting, radio, computing technology, automatic control, radar navigation, satellite Communications, high-speed transportation and other fields. In recent years, with the rapid development of biology and medicine, the application of ferrite materials in biomedicine, especially in tumor treatment, has attracted more and more attention. At present, as a safe, efficient and economical medical carrier, nano-ferrite magnetic materials have shown broad development space in cancer research. In-depth research has achieved remarkable results in animal experiments. In addition, the use ...

Claims

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Application Information

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IPC IPC(8): C04B35/26H01F1/34
Inventor 姚爱华王德平黄文旵周萘
Owner TONGJI UNIV
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