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Synthesis method of a core-shell structure fe3o4@sio2 nano-magnetic composite material

A nano-magnetic, core-shell structure technology, applied in the direction of inorganic material magnetism, inductor/transformer/magnet manufacturing, electrical components, etc., can solve the problems of rising cost, many TEOS raw materials, low TEOS utilization rate, etc. Effect

Inactive Publication Date: 2019-05-28
BAOJI UNIV OF ARTS & SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another example is the paper JCS.2017, 139, 4954-4961, CHEM ENG J.327(2017) 648–655, "Controllable Preparation of Magnetic Micro-nano Functional Materials and Research on the Removal of Pollutants in Water" (Shao Yanming, Lanzhou University, 2016), patents CN106277066, CN104475012, CN201710079429, CN201410784808.3 and CN201410147748.4 all disclose the specific preparation of Fe 3 o 4 @SiO 2 Composite method, summarizing the above methods found that: On the one hand, the above synthetic Fe 3 o 4 @SiO 2 The reaction is all carried out in an alkaline environment, and the follow-up waste liquid needs to be treated, which causes cost increase and is easy to cause environmental pollution; on the other hand, in the above-mentioned method, orthoethyl silicate (TEOS) 3 o 4 The weight ratio range of 1: (0.17 ~ 0.54), so the formation of nano-SiO 2 The shell consumes more TEOS raw materials, and there is a defect that the utilization rate of TEOS is low
[0004] So far, it has not been seen that a small amount of TEOS is used to obtain a core-shell Fe 3 o 4 @SiO 2 Synthetic method report of magnetic composite material

Method used

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  • Synthesis method of a core-shell structure fe3o4@sio2 nano-magnetic composite material
  • Synthesis method of a core-shell structure fe3o4@sio2 nano-magnetic composite material
  • Synthesis method of a core-shell structure fe3o4@sio2 nano-magnetic composite material

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Experimental program
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Effect test

Embodiment 1

[0034] Fe 3 o 4 @SiO 2 Preparation of nanomagnetic composite materials:

[0035] Step 1: Fe 3 o 4 The nanopowder is added to the polytetrafluoroethylene reactor, in which the Fe 3 o 4 The average particle size of the nanopowder is 35nm, adding ethanol-water solution with a mass concentration of ethanol of 80%, Fe 3 o 4 The weight ratio of nanopowder to ethanol-water solution is 1:1000, ultrasonically dispersed for 15min to obtain Fe 3 o 4 ethanol solution;

[0036] Step 2: To Fe 3 o 4 Add tetraethyl orthosilicate, TEOS and Fe to the ethanol solution 3 o 4 The weight ratio is 1: 1.8, ultrasonically dispersed for 15 minutes, packaged in a polytetrafluoroethylene reactor, placed in a homogeneous reactor, controlled at a speed of 10 r / min, reacted at 100°C for 10 hours, cooled, magnetically separated, and washed with water , dried to obtain nano-Fe 3 o 4 @SiO 2 magnetic composites.

[0037] Microscopic observation of the product revealed that SiO 2 The shell thick...

Embodiment 2

[0039] Fe 3 o 4 @SiO 2 Preparation of nanomagnetic composite materials:

[0040] Step 1: Fe 3 o 4 The nano powder is added to the polytetrafluoroethylene reactor, such as figure 1 , 2 , 5 shows the Fe used in this embodiment 3 o 4 Nano powder, its average particle diameter is 65nm, add ethanol mass concentration and be 20% ethanol-water solution, Fe 3 o 4 The weight ratio of nanopowder to ethanol-water solution is 1:200, ultrasonically dispersed for 30min to obtain Fe 3 o 4 ethanol solution;

[0041] Step 2: To Fe 3 o 4 Add tetraethyl orthosilicate, TEOS and Fe to the ethanol solution 3 o 4 The weight ratio is 1: 3.6, ultrasonically dispersed for 30 minutes, encapsulated in a polytetrafluoroethylene reactor, placed in a homogeneous reactor, controlled at a speed of 40 r / min, reacted at 140°C for 5 hours, cooled, magnetically separated, and washed with water , dried to obtain nano-Fe 3 o 4 @SiO 2 magnetic composites.

[0042] Such as image 3 , 4 、As shown...

Embodiment 3

[0045] Fe 3 o 4 @SiO 2 Preparation of nanomagnetic composite materials:

[0046] Step 1: Fe 3 o 4 The nanopowder is added to the polytetrafluoroethylene reactor, in which the Fe 3 o 4 The average particle size of the nanopowder is 60nm, adding ethanol-water solution with a mass concentration of ethanol of 50%, Fe 3 o 4 The weight ratio of nanopowder to ethanol-water solution is 1:500, ultrasonically dispersed for 20min to obtain Fe 3 o 4 ethanol solution;

[0047] Step 2: To Fe 3 o 4 Add tetraethyl orthosilicate, TEOS and Fe to the ethanol solution 3 o 4 The weight ratio is 1: 2.4, ultrasonically dispersed for 20 minutes, packaged in a polytetrafluoroethylene reactor, placed in a homogeneous reactor, controlled at a speed of 25 r / min, reacted at 120°C for 8 hours, cooled, magnetically separated, and washed with water , dried to obtain nano-Fe 3 o 4 @SiO 2 magnetic composites.

[0048] Microscopic observation of the product revealed that SiO 2 The shell thick...

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Abstract

The invention discloses a core-shell structured Fe3O4@SiO2 magnetic nano composite material synthesizing method. The method includes: preparing alcoholic solution of Fe3O4 nano powder, performing reaction for 5-15h at 100-150 DEG C in a homogeneous-phase reactor in a neutral environment according to a Fe3O4-tetraethoxysilane mass ratio of (1.5-4):1 to obtain a Fe3O4@SiO2 magnetic nano composite material. The method is carried out in the neutral environment without addition of other substances, and a reaction process is green and free of pollution; the prepared Fe3O4@SiO2 magnetic nano composite material is in a core-shell structure, and a SiO2 layer is 4-20nm in thickness and is in concentrated distribution; the Fe3O4@SiO2 magnetic nano composite material has advantages of single particles, high dispersity and great magnetic response; tetraethoxysilane consumption of the method is lower than that of a traditional method, and high utilization rate is realized.

Description

technical field [0001] The invention belongs to the field of magnetic composite material preparation, in particular to a Fe 3 o 4 @SiO 2 Nano-magnetic composite material synthesis method. Background technique [0002] With the rapid development of nanomaterials, nano-Fe 3 o 4 @SiO 2 As an important class of functional materials, magnetic composite microspheres are widely used in many fields such as catalysis, adsorption, targeted drug carrier, cell separation, nuclear magnetic resonance, immunoassay, and nucleic acid hybridization. [0003] Currently, Fe 3 o 4 @SiO 2 The preparation of magnetic composite materials has been extensively reported. For example, patent CN201110361859.1 discloses a kind of Fe 3 o 4 @SiO 2 Composite material preparation method, the method uses ethyl orthosilicate: Fe 3 o 4 The weight ratio of Fe is 1: (0.064~0.64), and Fe is prepared under the reaction conditions of concentrated hydrochloric acid and ammonia water. 3 o 4 @SiO 2 . ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/36H01F41/02
CPCH01F1/36H01F41/0253
Inventor 冯国栋苗康康罗小林潘哲裴霏
Owner BAOJI UNIV OF ARTS & SCI