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Composite nano silica/ferroferric oxide grain material and its prepn process

A nano-silicon dioxide, ferric oxide technology, applied in chemical instruments and methods, fibrous fillers, inorganic pigment processing and other directions, can solve problems that have not yet been seen, and achieve light weight, high product purity, and low cost. Effect

Inactive Publication Date: 2004-06-23
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But, also do not see so far the report about preparing nanometer silicon dioxide / ferric oxide composite particle on silicon dioxide surface coating nano-ferric oxide

Method used

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  • Composite nano silica/ferroferric oxide grain material and its prepn process

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Experimental program
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Effect test

Embodiment 1

[0017] (1). Disperse the nano silicon dioxide particles in the aqueous solution so that the weight percent concentration of the suspension is 0.5%;

[0018] (2). Ferrous chloride and ferric chloride are prepared into aqueous solution of appropriate concentration respectively, mix by the volume ratio of ferrous chloride: ferric chloride 1: 1.5, and drop in the suspension of step (1) , to obtain a mixed solution containing ferrous chloride and ferric chloride, the initial molar concentration of ferrous chloride and ferric chloride reaches 5×10 -5 mol / L and 7.5×10 -5 mol / L;

[0019] (3). A certain concentration of sodium hydroxide aqueous solution is added dropwise to the mixed solution containing ferrous chloride and ferric chloride in step (2), so that the pH of the solution is maintained at 8, while stirring at a uniform speed at 85 ° C, After reacting for 1 hour, aging for 0.5 hour; the product was washed, separated, and dried at 80° C. to obtain spherical / shell-shaped nano...

Embodiment 2

[0021] (1). Disperse the nano silicon dioxide particles in the aqueous solution so that the concentration by weight of the suspension is 1%;

[0022] (2). Prepare ferrous chloride and ferric chloride into aqueous solutions of appropriate concentration, mix ferrous chloride: ferric chloride at a volume ratio of 1:2, and add dropwise to the suspension in step (1) , to obtain a mixed solution containing ferrous chloride and ferric chloride, the initial molar concentration of ferrous chloride and ferric chloride reaches 1.0×10 -3 mol / L and 2.0×10 -3 mol / L;

[0023] (3). A certain concentration of ammonia solution is added dropwise to the mixed solution containing ferrous chloride and ferric chloride in step (2), so that the pH of the solution is kept at 9, and at the same time, it is stirred at a uniform speed under the condition of 85 ° C, and the reaction 1 After 1 hour, aging for 0.5 hour; the resultant was washed, separated, and dried at 80° C. to obtain spherical / shell-shap...

Embodiment 3

[0025] (1). Disperse the nano silicon dioxide particles in the aqueous solution so that the concentration by weight of the suspension is 2%;

[0026] (2). Ferrous chloride and ferric chloride are prepared into aqueous solution of appropriate concentration respectively, mix by the volume ratio of ferrous chloride: ferric chloride 1: 1.7, and drop in the suspension of step (1) , to obtain a mixed solution containing ferrous chloride and ferric chloride, the initial molar concentration of ferrous chloride and ferric chloride reaches 1.0×10 -3 mol / L and 1.7×10 -3 mol / L;

[0027] (3). A certain concentration of sodium hydroxide aqueous solution is added dropwise to the mixed solution containing ferrous chloride and ferric chloride in step (2), so that the pH of the solution is maintained at 9, while stirring at a uniform speed at 85 ° C, After reacting for 1 hour, aging for 0.5 hour; the product was washed, separated, and dried at 80° C. to obtain spherical / shell-shaped nanometer...

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Abstract

The present invention is composite nano silica / ferroferric oxide grain material and its preparation process. By means of chemical deposition process, nano ferroferric oxide crystal produced in the reaction is compounded and assembled onto the surface of spherical nano silica particle to form the composite grain material in spherical shell shape. The present invention features that through coating silica with nano ferroferric oxide, the features of both the silica and the nano ferroferric oxide are combined together to make the composite material possess light weight, magnetism and low radiance. The composite material may be used in making transparent pigment, stealth material, etc.

Description

technical field [0001] The invention belongs to the field of inorganic functional composite materials and preparation methods, and in particular relates to a nano silicon dioxide / ferric oxide composite particle material and a preparation method thereof. Background technique [0002] Composite materials with light weight and low emissivity are hot spots and difficulties in the research of stealth materials. Nano-encapsulated composite materials can be used as new stealth materials with excellent performance because of their diverse structures, adjustable components and properties, and easy processing and compounding. Nano-silica has low density, large specific surface area, and small thermal conductivity. It is a good light-weight, heat-insulating, and sound-insulating material. The low-emissivity gradient pigment is designed by coating the metal composite structure of infrared transparent pigment on the surface of silica, which provides a novel and b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C3/06
Inventor 唐芳琼任俊
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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