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Silicon dioxide coated ferric oxide composite materials and preparation method thereof

A technology of ferric oxide and silicon dioxide, which is applied in the direction of iron oxide/iron hydroxide, silicon dioxide, iron oxide, etc., can solve the problems of acid resistance, undisclosed, easy agglomeration, etc., and achieve the effect of low cost

Inactive Publication Date: 2020-05-29
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has its own shortcomings such as easy agglomeration and acid resistance, so its application is limited.
[0004] In the prior art, although SiO already exists 2 coated magnetic Fe 2 o 3 Composite materials (such as Chinese patent documents CN103406078A, CN101186762A), but they are all simple coatings, only one shape, and do not disclose how to control each parameter or condition to achieve a specific, controllable shape of SiO 2 Coated Fe 2 o 3 Composite materials

Method used

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  • Silicon dioxide coated ferric oxide composite materials and preparation method thereof
  • Silicon dioxide coated ferric oxide composite materials and preparation method thereof
  • Silicon dioxide coated ferric oxide composite materials and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The preparation method of the composite material (filamentous composite structure) coated with ferric oxide by silicon dioxide:

[0040] (1) Add 90mL 6M NaOH solution dropwise at a constant speed to 100mL 2M FeCl with good stirring 3 solution, a total of 10min drop, then add 10mL 0.06M Na 2 SO 4 The solution was stirred evenly and left to stand in an oven at 100°C for 12 days, and finally the product was repeatedly centrifuged and washed 3 times with deionized water and dried;

[0041] (2) Prepare 330 mL of amyl alcohol / polyvinylpyrrolidone solution of 10:1;

[0042] (3) Mix 30mL ethanol, 11mL deionized water, 225mg ellipsoidal α-Fe 2 o 3 Colloidal particles, 2mL 0.18M sodium citrate aqueous solution, 6mL ammonia water, and 3mL tetraethylorthosilicate were gradually added to the amyl alcohol / polyvinylpyrrolidone solution;

[0043] (4) Transfer the reactant to a 30°C water bath and let it stand for 6 hours, then wash with water 3-5 times, and dry it.

Embodiment 2-6

[0045] In Examples 2-6, except that the conditions in Table 1 are different, other operations and parameters are the same as in Example 1.

[0046] The specific reaction conditions of the different embodiments of table 1

[0047]

[0048] figure 1 The ellipsoidal Fe prepared for embodiment 1 step (1) 2 o 3 SEM pictures of particles. Depend on figure 1 It can be seen that the major diameter of the ellipsoid range is 0.9-1.0 μm, and the minor diameter is 0.7-0.8 μm.

[0049] figure 2 Cube type Fe prepared for embodiment 4 step (1) 2 o 3 SEM pictures of particles. Depend on figure 2 It can be seen that the side length of the cube ranges from 0.8 μm to 1.1 μm.

[0050] image 3 It is an SEM picture of the filamentous composite structure of the composite material in Example 1, with a length of 7.5-9.5 μm and a diameter of 0.2-0.4 μm.

[0051] Figure 4 It is an SEM picture of the matchstick-shaped composite structure of the composite material in Example 2, with a ...

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Abstract

The invention discloses silicon dioxide coated ferric oxide composite materials and a preparation method thereof. The preparation method comprises the following steps: adding Fe2O3 colloidal particles, ethanol, water, a sodium citrate solution, ammonia water and tetraethyl orthosilicate into a solution containing polyvinylpyrrolidone pentanol, standing in an environment of 30-60 DEG C, washing anddrying. According to the preparation method, a series of composite materials with various morphologies can be simply, effectively and stably prepared by changing the reagent addition amount and reaction conditions, so that an idea is provided for morphology design research of hybrid particles, and possibility is provided for exploring new nano particles and nano structures; the inherent defects of Fe2O3 magnetic particles are modified, and a silicon dioxide rod structure which is low in cost and wide in application is introduced, so that the composite structure has certain potential application value in the fields of photon / plasma devices, nano-electronics, high-efficiency conversion / energy storage, micro diagnosis systems, drug / gene transfer, hierarchical structure catalysts and the like.

Description

technical field [0001] The invention specifically relates to a silicon dioxide-coated ferric oxide composite material and a preparation method thereof. Background technique [0002] SiO 2 Due to its stable chemical properties, the material has a wide range of applications in the fields of electronics, optics, and fireproof materials. In recent years, a new class of micron-sized silica rods has received much attention. Compared with nanorods, these colloidal rods can provide completely different properties and applications in different size domains. For example, when silica rods are in the half-micron size range, they have very good anti-reflection properties and have been tried to be used in the manufacture of anti-reflection coatings. Utilizing the chemical inertness of silica rods, it can be applied to catalyst carriers and drug carriers through simple surface modification. In addition, it also has great application potential in the field of optics and composite materi...

Claims

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Application Information

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IPC IPC(8): C01G49/06C01B33/12
CPCC01G49/06C01B33/12C01P2004/84C01P2004/03C01P2004/32C01P2004/30Y02P20/10
Inventor 蔡春华李镇王立权林嘉平续文恒黄琦婧
Owner EAST CHINA UNIV OF SCI & TECH
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