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Preparation method for manganese dioxide@silica nano composite particles with core-shell structures

A technology of nanocomposite particles and silicon dioxide, which is applied in the direction of manganese oxide/manganese hydroxide, silicon dioxide, silicon oxide, etc., can solve the problems of high equipment requirements, product agglomeration, and insufficient environmental protection, and achieve simple formula and easy operation convenient effect

Active Publication Date: 2018-09-11
UNIV OF SCI & TECH OF CHINA
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Benefits of technology

This patented technology describes making small metal oxide (MMO)-based materials that have unique properties such as high surface area for catalytic activity or ability to absorb light effectively without losing their effectiveness when used alone due to reduced aggregability caused by strong bonds between atoms at certain points within them. These new composites are useful because they provide better performance than existing ones while also being easier to manufacture compared to previous methods.

Problems solved by technology

This patented technical problem addressed in this patent relates to improving the dispersibility and durability of nanoparticulate compounds such as manganous oxides while reducing their negative effects upon other components like pigments that come close together when they form layers around each other due to strong coherence forces between them. Existing techniques involve adding various substances called surfactizers onto surfaces of these particles without affecting its function. These addition processes may result in decreased product quality and increased risk of contamination issues.

Method used

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  • Preparation method for manganese dioxide@silica nano composite particles with core-shell structures
  • Preparation method for manganese dioxide@silica nano composite particles with core-shell structures
  • Preparation method for manganese dioxide@silica nano composite particles with core-shell structures

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preparation example Construction

[0028] The invention provides a core-shell structure of MnO 2 @SiO 2 The preparation method of nano composite particles includes:

[0029] A) Mix potassium permanganate and silica precursor to obtain a mixed solution;

[0030] B) The mixed solution is irradiated with a cobalt 60 source to initiate the reaction under stirring conditions to obtain an irradiated mixed solution;

[0031] C) Centrifuge and separate the irradiated mixture to obtain core-shell structured MnO 2 @SiO 2 Nano composite particles.

[0032] All raw materials of the present invention are analytically pure.

[0033] In the present invention, potassium permanganate is first dissolved in water, mixed with a silica precursor, and stirred to obtain a mixed solution.

[0034] Wherein, the mass concentration of the potassium permanganate in the mixed solution is preferably 0.1M or less; the mass percentage of the silica precursor and water is preferably 3% or less.

[0035] The stirring is preferably magnetic stirring. The p...

Embodiment 1

[0054] 100mL single neck round bottom flask with 79mg KMnO 4 , Then add 50mL deionized water, magnetically stir to make KMnO 4 Dissolved, the pH of the solution was 7.1. Continue to add 0.1 mL of tetraethyl orthosilicate (TEOS) under magnetic stirring. Pour 10minN into the flask 2 Then, plug the bottle mouth with a vacuum stopper, and then seal the bottle mouth with parafilm. The sealed flask was transferred to the cobalt 60 radioactive source chamber and irradiated for 24 hours under magnetic stirring. The absorbed dose rate was 60 Gy / min and the absorbed dose was 86 kGy. After the irradiation, the round-bottomed flask was taken out, stood still, and the dispersion was transferred into a centrifuge tube, put into a centrifuge (HC-2518), and centrifuged at 8000 rpm to separate the solid product. The obtained product was washed alternately with water and ethanol, and centrifuged. Finally, the collected product was placed in an electric heating blast drying oven (GZX-9070MBE) a...

Embodiment 2

[0056] 100mL single neck round bottom flask with 79mg KMnO 4 , Then add 50mL deionized water, magnetically stir to make KMnO 4 Dissolved, the pH of the solution was 7.1. Continue to add 0.1 mL of tetraethyl orthosilicate (TEOS) under magnetic stirring. Pour 10minO into the flask 2 Then, plug the bottle mouth with a vacuum stopper, and then seal the bottle mouth with parafilm. The sealed flask was transferred to the cobalt 60 radioactive source chamber and irradiated for 24 hours under magnetic stirring. The absorbed dose rate was 60 Gy / min and the absorbed dose was 86 kGy. After the irradiation, the round-bottomed flask was taken out, stood still, and the dispersion was transferred into a centrifuge tube, put into a centrifuge (HC-2518), and centrifuged at 8000 rpm to separate the solid product. The obtained product was washed alternately with water and ethanol, and centrifuged. Finally, the collected product was placed in an electric heating blast drying oven (GZX-9070MBE) a...

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Abstract

The invention provides a preparation method for MnO2@SiO2 nano composite particles with core-shell structures. The method comprises the steps of A) mixing potassium permanganate and a silica precursorto obtain a mixed solution; B) irradiating the mixed solution with a cobalt 60 source under a stirring condition to initiate reactions to obtain a mixed solution after irradiation; C) centrifuging the irradiated mixed solution, and separating to obtain the MnO2@SiO2 nano composite particles with the core-shell structures. The method directly irradiates the potassium permanganate solution containing the silica precursor by 60Co gamma-ray, and obtains the MnO2@SiO2 composite nano particles with particle diameters of 100 nanometre or less which take MnO2 as cores and SiO2 as shells by a one-stepmethod. The method has the advantages of simple formula, convenient operation, economic performance, energy saving, green and environmental protection.

Description

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Claims

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Application Information

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Owner UNIV OF SCI & TECH OF CHINA
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