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Superparamagnetic nano-ferroferric oxide and preparation thereof

A ferric tetroxide and superparamagnetic technology, applied in the field of magnetic nanomaterials, can solve the problems of enhanced magnetic effect, easy agglomeration, complicated operation process, etc., and achieve the effect of small particle size

Inactive Publication Date: 2011-11-09
张永昶
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Problems solved by technology

[0003] Although nano-ferric oxide is widely used, it has two fatal defects: 1. It has a large specific surface area, which makes it easy to agglomerate; once small aggregates are formed, ferric oxide loses its super Paramagnetic, the magnetic interaction between adjacent aggregates is enhanced, leading to further agglomeration
However, because the above-mentioned methods all have the shortcomings of complex operation process, so finding a simple method to prepare ultra-fine ferroferric oxide has always been the direction of people's research.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment

[0025] Weigh 5.4g FeCl 3 ·6H 2 O and 1.98 g FeCl 2 4H 2 O, join in the there-necked flask;

[0026] Nitrogen was passed into the three-necked flask to remove the air, and after ventilating for 45 minutes, 15ml of 28% concentrated ammonia water was added, and vigorously stirred;

[0027] After about 1 hour, after the reaction precipitation is complete, slowly raise the temperature to 90°C;

[0028] Add 3ml of oleic acid to the heated solution, and stir for 3 hours;

[0029] Add distilled water to the reaction solution and let it settle, pour off the upper layer solution, add n-hexane to ultrasonically disperse, add distilled water to settle, repeat several times, until the aqueous solution reaches PH=7, pour off the upper layer aqueous solution, add n-hexane to disperse and store.

[0030] The average particle size of the nano ferric oxide that the present embodiment obtains is 15nm, and the magnetization saturation intensity is 55emu / g.

[0031] The above-mentioned metho...

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Abstract

The invention provides a nano-ferroferric oxide sol-gel method production process which adopts ferrous chloride, ferric chloride, ammonia water and oleic acid as main raw materials to synthesis of nano-ferroferric oxide, and adopts the oleic acid to carrying out modification. The method provided by the present invention has advantages of simple experiment equipment, convenient operation and large output. The nano-ferroferric oxide provided by the present invention has characteristics of uniform particle size, good dispersity, stable magnetism, a mean diameter of 15 nm, a saturation magnetization of 55 emu / g. In addition, due to presenting the superparamagnetic, the nano-ferroferric oxide materials can be applicable for a plurality of fields such as chemical engineering, machinery, electronic industry, printing, medicine and the like; meanwhile, due to remarkable magnetic susceptibility and gas and humidity sensing properties, the nano-ferroferric oxide provides great application prospects for a plurality of the fields such as high-density magnetic recording materials, air and humidity sensor parts, magnetic separation of immune cells, magnetic resonance imaging, drug controlled release and the like.

Description

[technical field] [0001] The invention relates to the technical field of magnetic nanometer materials, in particular to a sol method production process of nanometer iron tetroxide. [Background technique] [0002] When the particle size of nano ferroferric oxide is less than 15nm, it has superparamagnetism, that is, it has no magnetism when there is no external magnetic field; when there is an external magnetic field, it is easily magnetized; after the external magnetic field is cancelled, it will be in the pole again. Demagnetization in a short time, no hysteresis, and zero coercive force. The emergence of superparamagnetism has made ferroferric oxide nanomaterials used in chemical industry, machinery, electronics, printing, medicine and other industries, and has been widely used in high-density magnetic recording materials, gas and humidity sensors due to its remarkable magnetic sensitivity and gas humidity sensitivity. It has great application prospects in fields such as ...

Claims

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Application Information

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IPC IPC(8): C01G49/08B82B3/00
Inventor 张永昶
Owner 张永昶
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