Method for preparing magneto-chromism ferroferric oxide sol

A ferroferric oxide and magnetotropic technology, applied in chemical instruments and methods, color-changing fluorescent materials, magnetic liquids, etc., to achieve the effects of good monodispersity, simple preparation method, and strong magnetic properties

Inactive Publication Date: 2011-04-13
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In terms of modification and stability of magnetic particles, Yin YD et al. reported that SiO 2 and PAA-coated magnetochromic magnetic sol, no one has reported on the surface modification of the prepared magnetic particles to obtain a magnetochromic magnetic sol

Method used

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  • Method for preparing magneto-chromism ferroferric oxide sol
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  • Method for preparing magneto-chromism ferroferric oxide sol

Examples

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Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Preparation of Magnetochromic Iron Tetroxide Sol

[0034] 1) Fe 3 O 4 Synthesis of Magnetic Particles

[0035] Mix ethylene glycol (EG) and diethylene glycol (DEG) according to the weight ratio of 13 / 7 to form 40ml of the required mixed solution; divide the mixed solution into two parts, and dissolve 3.80mmol hexahydrate trichlorohydrin in one part Ferric chloride and 1 g polyethylene glycol-20000 (A), dissolved 0.20 mmol ferrous chloride tetrahydrate (B) in one part. Add 3.6g of sodium acetate to liquid A under the action of ultrasound, stir well, then quickly add liquid B and stir quickly, transfer it to a hydrothermal kettle within 10 seconds, and seal it. The hydrothermal still that sample is housed is placed in blast oven, reacts at 220 degrees centigrade for 6 hours.

[0036] After the reaction, the hydrothermal kettle was cooled to room temperature. Pour the product in the liner into a small beaker, and collect the product by magnetic pr...

Embodiment 2

[0045] Example 2 Preparation of Magnetochromic Iron Tetroxide Sol

[0046] 1) Fe 3 O 4 Synthesis of Magnetic Particles

[0047] Mix ethylene glycol (EG) and diethylene glycol (DEG) according to the weight ratio of 27 / 13 to form 40 ml of the required mixed solution; divide the mixed solution into two parts, and dissolve 3.80 mmol hexahydrate trichlorohydrin in one part Ferric chloride and 1 g polyethylene glycol-20000 (A), dissolved 0.20 mmol ferrous chloride tetrahydrate (B) in one part. Add 3.6g of sodium acetate to liquid A under the action of ultrasound, stir well, then quickly add liquid B and stir quickly, transfer to a hydrothermal kettle, and seal. The hydrothermal still that sample is housed is placed in blast oven, reacts at 220 degrees centigrade for 6.5 hours.

[0048] After the reaction, the hydrothermal kettle was cooled to room temperature. Pour the product in the liner into a small beaker, and collect the product by magnetic precipitation using a...

Embodiment 3

[0053] 1) Synthesis of magnetic particles

[0054] Mix ethylene glycol (EG) and diethylene glycol (DEG) according to the weight ratio of 3 / 2 to make the required mixed solution 40ml; divide the mixed solution into two parts, and dissolve 3.80mmol hexahydrate trichlorohydrin in one part Ferric chloride, 1g polyethylene glycol-20000 and 3.6g sodium acetate (A), dissolved 0.20mmol ferrous chloride tetrahydrate (B) in one part. After mixing the two solutions evenly, transfer them to the Teflon lining of the hydrothermal kettle within 10 seconds, and seal them. The hydrothermal still that sample is housed is placed in blast oven, reacts at 220 degrees centigrade for 7.5 hours.

[0055] After the reaction, the hydrothermal kettle was cooled to room temperature. Pour the product in the liner into a small beaker, and collect the product by magnetic precipitation using a magnet. Then wash three times with ethanol, and then wash three times with distilled water before use.

[0056...

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Abstract

The invention discloses a method for preparing magneto-chromism ferroferric oxide sol. The magneto-chromism ferroferric oxide sol is prepared by a synthesis and modification two-step method, namely by the following steps of: synthesizing monodispersity Fe3O4 magnetic particles by adopting a solvothermal method; modifying the product of Fe3O4 magnetic particles by using a surfactant of polyacrylicacid; and dispersing in carrier liquid of water. The magneto-chromism ferroferric oxide sol prepared by the method has uniform particle size distribution of the magnetic particles, good monodispersity, no agglomeration, the average particle size of 100nm and high magnetic property of the particles, has the maximum specific saturation magnetization of the particles of 88emu/g, and is stable and superparamagnetic. The magneto-chromism ferroferric oxide sol prepared by the method can be widely applied in the fields such as machinery, electronics, optics, magnetic, chemistry, biology and the like.

Description

technical field [0001] The invention relates to the preparation, surface modification and dispersion technology of nanometer powder, in particular to the preparation and modification method of a magnetic field-responsive magnetochromic ferric oxide sol. Background technique [0002] The so-called magnetochromic sol is a uniform and stable sol formed by highly dispersing monodisperse magnetic particles treated with surfactants in the base liquid, so it has both magnetism and fluidity at the same time, and it has special physical properties , optical properties, chemical properties and flow properties, can respond to magnetism and display different colors, mainly composed of nano-magnetic particles, surface modifiers and carrier liquid, and its process technology can be described by the following points: [0003] 1) Selection and preparation of nano-magnetic particles: Commonly used magnetic materials are divided into three categories: ferrite system, metal system and iron nit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K9/00H01F1/44
Inventor 庄琳沈辉梁锦华
Owner SUN YAT SEN UNIV
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