Nano silica microsphere with surface topological structure and preparation method of nano silica microsphere

A technology of nano-silica and topological structure, applied in chemical instruments and methods, nanotechnology, inorganic chemistry, etc., can solve problems such as difficult batch preparation and complex synthesis process, and achieve the effect of reducing pollutant emissions and production costs

Active Publication Date: 2019-09-06
EAST CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the synthesis of nano-silica nano-microspheres with surface topological structure uses a variety of surfactants (CN 103663478), and the synthesis process is complicated and difficult to prepare in batches.

Method used

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  • Nano silica microsphere with surface topological structure and preparation method of nano silica microsphere
  • Nano silica microsphere with surface topological structure and preparation method of nano silica microsphere
  • Nano silica microsphere with surface topological structure and preparation method of nano silica microsphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Example 1: Inject 50ml of water and 1ml TEOS into a 250mL Erlenmeyer flask at a room temperature of 20°C under stirring, and stir (300rmp at a rotational speed) for 2 hours; add 40ml of ethanol to the Erlenmeyer flask, and stir at a room temperature of 20°C (rotational speed 300rmp) 2 hours, the concentration of TEOS is 0.05M; Add mass fraction 28% ammonia solution in conical flask, make the concentration of ammonia reach 0.44mol / L, react 2h under the condition of stirring (rotational speed 200rmp), add to it A certain volume of 3.3% ammonia solution was added (ratio of the volume of added ammonia water to the volume of the original sol, 17:5), and reacted for 12 hours to obtain silica sol. Silica sol was centrifuged at room temperature at 20°C (rotating speed 15000rmp, time 30min), and washed with ethanol 3 times to obtain silica microspheres with an average particle diameter of 103nm and a uniform surface topological structure (see figure 1 ).

Embodiment 2

[0060] Example 2: Inject 30ml of water and 3ml TEOS into a 250mL Erlenmeyer flask at a room temperature of 20°C under stirring, and stir (300rmp at a rotational speed) for 2 hours; add 40ml of ethanol to the Erlenmeyer flask, and stir at a room temperature of 20°C (rotational speed 300rmp) 2 hours, the concentration of TEOS is 0.19M; Add mass fraction 28% ammoniacal solution to conical flask, make the concentration of ammonia reach 1.48mol / L, react 2h under the condition of stirring (rotational speed 250rmp), add to it A certain volume of 2.8% ammonia solution was added (ratio of the volume of added ammonia water to the volume of the original sol, 50:11), and reacted for 11 hours to obtain silica sol. Under the condition of room temperature 20°C, the silica sol is centrifuged (rotating speed 5000rmp, time 10min), and the silica sol is washed 3 times with ethanol to obtain silica microspheres with an average particle diameter of 250nm and uniform size (see figure 2 ).

Embodiment 3

[0061] Example 3: Inject 25ml of water and 5ml TEOS into a 250mL Erlenmeyer flask at a room temperature of 20°C under stirring, and stir (rotating at 300rmp) for 2 hours; add 35ml of ethanol to the Erlenmeyer flask, and stir at a room temperature of 20°C (rotating speed 300rmp) 2 hours, the concentration of TEOS is 0.36M; Add mass fraction 28% ammonia solution in conical flask, make the concentration of ammonia reach 1.48mol / L, after stirring (rotating speed 300rmp) condition 2h, add to A certain volume of 2.8% ammonia solution was added therein (the ratio of the volume of added ammonia water to the volume of the original sol was 50:11) and reacted for 10 hours to obtain a silica sol. Silica sol was centrifuged at room temperature at 20°C (rotating speed 4000rmp, time 20min), washed with ethanol 3 times, and silica microspheres with an average particle diameter of 225nm and uniform size could be obtained (see image 3 ).

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Abstract

The invention discloses a preparation method of a nano silica microsphere with a surface topological structure. The method comprises the following steps that under a stirring condition, firstly, a silicon source and deionized water are mixed in a certain proportion; then, a small molecule surface active substance (R-X) is added to obtain a clear and transparent mixed solution; then, a basic catalyst is added, and a reaction is performed to generate a silica sol (a); then, an aqueous solution of ammonia is added, and a reaction is performed to generate a silica sol (b); finally, the silica sol(b) is subjected to solid-liquid separation and washed to obtain the nano silica microsphere with the surface topological structure. The nano silica microsphere with the surface topological structureand the preparation method thereof have the advantages that the preparation method is simple, the conditions are mild, the particle size is controllable, the reaction batch size is large, the method is an environmental-friendly synthesis method, and the application prospect is broad.

Description

technical field [0001] The invention relates to a preparation method of nano silicon dioxide microspheres with surface topological structure, in particular to a green, bulk nano silicon dioxide microsphere with surface topological structure and a preparation method thereof, belonging to the technical field of chemistry and inorganic materials. Background technique [0002] classic Monodisperse silica microspheres were prepared by using alcohol as a solvent, water as a reactant, and ammonia as a catalyst. Generally, alcohol, water and catalyst are mixed first to obtain an alcohol-water-ammonia solution, and then, under stirring conditions, the silicon source / alcohol solution is added dropwise to the alcohol-water-ammonia solution, and the silicon source is hydrolyzed to obtain (Si(OH ) 4 ), Si(OH) 4 Polycondensation-growth to obtain solid silica microspheres with smooth surfaces. It is widely used in coatings, ceramics, cosmetics, colloidal crystals, catalysis, etc. How...

Claims

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Application Information

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IPC IPC(8): C01B33/141B82Y40/00
CPCC01B33/141B82Y40/00C01P2006/12C01P2004/62C01P2004/32C01P2004/04
Inventor 马士禹陈喆相雪晨任东方许嘉琼陈宁李自成
Owner EAST CHINA NORMAL UNIVERSITY
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