Preparation for magnetic fluid and chitosan magnetic micro-sphere

A chitosan microsphere and magnetic fluid technology, applied in magnetic liquid and other directions, can solve the problems of magnetic chitosan microspheres that are not easy to recover, easy to aggregate, not easy to aggregate, etc., so as to overcome the difficult recovery and easy aggregation, and improve the magnetic strength. , the effect of reducing the coercivity

Active Publication Date: 2009-06-17
兴化市正阳水泥有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The first object of the present invention is to overcome the shortcomings that the magnetic chitosan microspheres containing the magnetic fluid prepared by the prior art are not easy to

Method used

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  • Preparation for magnetic fluid and chitosan magnetic micro-sphere

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preparation example Construction

[0012] The invention provides a method for preparing a magnetic fluid, which comprises adding an excessive amount of alkaline aqueous solution to an aqueous solution containing ferrous ions and ferric ions; then carrying out a precipitation reaction under a protective gas atmosphere to separate the precipitation reaction product get Fe 3 o 4 ; will get Fe 3 o 4 and surfactants are added to the carrier liquid for heating, and then the heated product is separated to obtain a magnetic fluid, wherein, in the aqueous solution containing ferrous ions and ferric ions, the moles of ferrous ions and ferric ions The ratio is 1.4-1.8:1.

[0013] The inventor of the present invention has carried out meticulous research to existing ferrofluid preparation method, finds that when carrying out precipitation reaction, the molar ratio of ferrous ion and ferric ion directly affects the property of the ferrofluid obtained; And the present invention The inventor unexpectedly found that when th...

Embodiment 1

[0030] This embodiment is used to illustrate the preparation method of the magnetic fluid provided by the present invention.

[0031] (1) 0.36 moles of ferric chloride and 0.2 moles of ferric chloride are dissolved in 1000 milliliters of water to obtain an aqueous solution; then adding 320 milliliters of aqueous sodium hydroxide solution to the aqueous solution is 3.2 moles / liter of sodium hydroxide solution to obtain Mixed solution, in the mixed solution, Fe 3+ with OH - The molar ratio of the mixture was 1:5; the mixture was then transferred to a 2-liter four-neck flask equipped with a stirrer (Beijing Qili Dasen Instrument Technology Co., Ltd., RS-4A), a thermometer and a condenser tube, and the temperature was raised in a water bath under a nitrogen atmosphere. Carry out precipitation reaction, the temperature of reaction is 60 ℃, the time of reaction is 80 minutes, and stirring speed is 500 rev / min; Separate the obtained Fe with magnet (magnetic strength is 100emu / g) aft...

Embodiment 2

[0036] This embodiment is used to illustrate the preparation method of the magnetic fluid provided by the present invention.

[0037] (1) 0.32 moles of ferric chloride and 0.2 moles of ferric chloride are dissolved in 800 milliliters of water to obtain an aqueous solution; then adding 500 milliliters of concentration in the aqueous solution is an aqueous potassium hydroxide solution of 3.2 moles / liter to obtain Mixed solution, in the mixed solution, Fe 3+ with OH - The molar ratio of the mixture is 1:8; the mixed solution is then transferred to a 2-liter four-neck flask equipped with a stirrer (Beijing Qili Dasen Instrument Technology Co., Ltd., RS-4A), a thermometer and a condenser tube. Carry out precipitation reaction, the temperature of reaction is 80 ℃, the time of reaction is 50 minutes, and stirring speed is 500 revolutions / minute; Separate the obtained Fe with magnet (magnetic strength is 100emu / g) afterwards 3 o 4 , and washed 3 times with 100 ml deionized water re...

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Abstract

The invention provides a preparation method of magnetic fluid, comprising: adding excessive alkaline aqueous solution into the aqueous solution containing ferrous ions and ferric ions; processing precipitation reaction under protective gas, separating the products of precipitation reaction to obtain Fe3O4; adding the Fe3O4 and surface active agent into carrier liquid to be heated, separating to obtain the product of heating process, and obtaining magnetic fluid, wherein the mol ratio of the ferrous ions and the ferric ions in the aqueous solution containing ferrous ions and ferric ions is 1.4-1.8: 1. The invention further provides a preparation method of magnetic chitosan microsphere, adopting the magnetic fluid prepared by the aforementioned method. The magnetic chitosan microsphere containing the inventive magnetic fluid is more suitable to be the carrier of immobilized enzymes.

Description

technical field [0001] The invention relates to a preparation method of magnetic fluid and a preparation method of magnetic chitosan microspheres. Background technique [0002] Chitosan is a kind of alkaline polysaccharide which is non-toxic and has good biocompatibility. Chitosan has been widely used in the field of immobilized enzymes. Immobilized enzymes refer to the technology of immobilizing free enzymes on carriers by physical adsorption or chemical binding to improve the operational stability of enzymes and repeatedly recycle enzymes. The surface of the chitosan carrier itself has a positive charge, which has a certain adsorption effect on the enzyme protein. In addition, after the surface treatment of the chitosan carrier with dialdehyde, the surface of the chitosan carrier carries a large number of aldehyde activated groups. These aldehyde activating groups are covalently bonded to amino groups on the surface of the enzyme protein to obtain immobilized enzymes. He...

Claims

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Application Information

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IPC IPC(8): H01F1/44C08J3/12C08J3/24C08L5/08C08K3/22
Inventor 祝学远
Owner 兴化市正阳水泥有限公司
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