Method for enwrapping ferric oxide by silicon dioxide

A silicon dioxide and iron oxide technology, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve problems such as polydispersity and deformation, and achieve good monodispersity, simple process, and low equipment requirements Effect

Inactive Publication Date: 2008-05-28
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, all reported methods generally have limitations such as agglomeration, distorted spherical shape, polydispersity, additional surface treatment to prevent new nuclei generation, etc.

Method used

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  • Method for enwrapping ferric oxide by silicon dioxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Evenly disperse the iron oxide particles in a mixed solution of ethanol and ammonia water (the mass percentage of ammonia in the ammonia water is 25-28%), the ammonia water accounts for 20% of the mass percentage of the alcohol-ammonia mixture, The mass percent of polyvinylpyrrolidone is 0.47:100; then the iron oxide suspension obtained is added to the n-amyl alcohol solution of polyvinylpyrrolidone under stirring conditions, and the mass percent of polyvinylpyrrolidone in the n-amyl alcohol of polyvinylpyrrolidone is 1.25%. The mass ratio of the iron suspension and the n-amyl alcohol solution of polyvinylpyrrolidone is 20:100; after stirring for 30 minutes, add the ethanol solution of ethyl orthosilicate to the reaction solution obtained above, and the ethyl orthosilicate and the The mass percent of the ethanol solution of tetraethyl orthosilicate is 20%, and the mass ratio of tetraethyl orthosilicate and iron oxide particle is controlled as 1.2: 1; Continue stirring fo...

Embodiment 2

[0028] Evenly disperse the iron oxide particles in a mixed solution of ethanol and ammonia water (the mass percentage of ammonia in the ammonia water is 25-28%), the ammonia water accounts for 20% of the mass percentage of the alcohol-ammonia mixture, The mass percent of polyvinylpyrrolidone is 0.03:100; then the iron oxide suspension obtained is added to the n-amyl alcohol solution of polyvinylpyrrolidone under stirring conditions, and the mass percent of polyvinylpyrrolidone in n-amyl alcohol of polyvinylpyrrolidone is 1.25%. The mass ratio of the iron suspension and the n-amyl alcohol solution of polyvinylpyrrolidone is 20:100; after stirring for 30 minutes, add the ethanol solution of ethyl orthosilicate to the reaction solution obtained above, and the ethyl orthosilicate and the The mass percentage of the ethanol solution of tetraethyl orthosilicate is 20%, and the mass ratio of tetraethyl orthosilicate and iron oxide particle is controlled as 186.7: 1; Continue stirring f...

Embodiment 3

[0030] Evenly disperse the iron oxide particles in a mixed solution of methanol and ammonia water (the mass percentage of ammonia in the ammonia water is 25-28%), the ammonia water accounts for 10% of the mass percentage of the alcohol-ammonia mixture, The mass percent of polyvinylpyrrolidone is 0.025: 100; then the obtained iron oxide suspension is added to the n-pentanol solution of polyvinylpyrrolidone under stirring conditions, and the mass percent of polyvinylpyrrolidone in the n-pentanol of polyvinylpyrrolidone is 0.3%. The mass ratio of the iron suspension to the n-amyl alcohol solution of polyvinylpyrrolidone is 5:100; after stirring for 15 minutes, add the methanol solution of ethyl orthosilicate to the reaction solution obtained above, and the ethyl orthosilicate and the The mass percent of the methanol solution of tetraethyl orthosilicate is 10%, and the mass ratio of tetraethyl orthosilicate and iron oxide particle is controlled as 0.5: 1; Continue stirring for 6 ho...

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Abstract

The invention discloses a process for coating ferric oxide with silicon dioxide, which comprises the procedures that ferric oxide particles are homogeneously dispersed into mixed solution of ethanol and ammonia, then the mixture is added into n-pentanol solution of polyvinylpyrrolidone in the condition of stirring, the mixture is continuously stirred for 6-24hours, after the reaction liquid is centrifugated, the fluid portion is removed, thereby ferric oxide particles coated by silicon dioxide are achieved. The invention employs restriction of polyvinylpyrrolidone to water and perfect adsorption effect of polyvinylpyrrolidone to ferric oxide, successfully locates hydrolysis reaction of ethyl orthosilicate on the surface of the ferric oxide, thereby the ferric oxide is coated homogeneously. Thickness of layer of the silicon dioxide can be constantly increased by simply increasing mass ratio of ethyl orthosilicate and ferric oxide particles. The invention has the advantages of low costs and simple operation, which needs no complex equipment and is capable of rapid volume-production, and the like.

Description

technical field [0001] The invention relates to a method for covering iron oxide with silicon dioxide. Background technique [0002] Because of its non-toxicity, low cost and relative stability, iron oxide has been widely used in magnetic recording media, catalysts, gas sensors, pigments, optical devices, rechargeable batteries and electromagnetic devices, and has become one of the current hot research topics. For the stability of iron oxide and the application of expanding iron oxide, there are many methods such as microemulsion [S.Santra, R.Tapec, N, Theodoropoulou, J, Dobson, A, Hebard, W, Tan, Langmuir, 2001, 17 , 2900], molecular template method [P.Wu, J.Zhu, Z.Xu, Adv.Funct.Mater.2004, 14, 345], improved Stber method [Y.Lu, Y.Yin, B.T..Mayers , Y.Xia, Nano.Lett.2002, 2, 183], [L.Hao, C.Zhu, W.-Q.Jiang, C.-N.Chen, Y.Hu, Z.-Y.Chen, J.Mater.Chem.2004, 14, 2929], [C.Yang, G.Wang, Z.Lu, J.Sun, J.Zhuang, W.Yang, J.Mater.Chem.2005, 15, 4252] , [Y.-S.Han, G.-Y.Jeong, S.-Y....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C3/06C09C1/24
Inventor 章建辉刘淮涌王振林闵乃本
Owner NANJING UNIV
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