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Preparation method of nanometer silica hollow microspheres

A nano-silicon dioxide, silicon dioxide technology, applied in the direction of silicon dioxide, silicon oxide, nanostructure manufacturing, etc., can solve the problem of difficult to effectively construct hollow microspheres, low yield of hollow microspheres, and chemical reactions of precursors Effectively control and other problems to achieve the effects of easy availability of emulsifiers, improved structural adjustability, and simple emulsifiers

Inactive Publication Date: 2009-10-07
NANJING UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, based on the characteristics of the chemical reaction and reaction process of the silica precursor, the intermediate product has a strong diffusion ability in the water phase, making it difficult to be bound on the water-oil interface, making it difficult to effectively construct hollow microstructures. ball
Especially in the oil / water (O / W) system, the diffusion range is wide, it is easy to produce a large number of non-hollow solid particles, and the yield of hollow microspheres is low
In the water / oil (W / O) system, although the product can be well bound inside the water droplet, it is still difficult to effectively control the chemical reaction of the precursor at the oil-water interface to facilitate the formation of a hollow structure. Therefore, it is necessary to Only by adopting targeted special means and methods to solve key problems can silica hollow microspheres be effectively prepared

Method used

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  • Preparation method of nanometer silica hollow microspheres

Examples

Experimental program
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Effect test

Embodiment 1

[0022] 1 part of nonylphenol ethoxylate ( n=4) into the Erlenmeyer flask containing 80 parts of cyclohexane, and under ultrasonic and mechanical stirring, 1 part of ammonia water (the concentration of ammonia water is 25%) was added dropwise to the Erlenmeyer flask to obtain a translucent emulsion. Then stop the ultrasound, under magnetic stirring, add 3 parts of ethyl orthosilicate, react at room temperature for 20 minutes, there is precipitation, continue to stir for 4 hours, filter, wash with ethanol, centrifuge, and dry at 60 ° C to obtain nanometer two Silica hollow microspheres. Observed under a transmission electron microscope, it is a hollow microsphere with an average particle diameter of about 500nm and a shell thickness of about 40nm.

Embodiment 2

[0024] 1 part of octylphenol ethoxylate ( n=6) into the Erlenmeyer flask containing 150 parts of cyclohexane, and under ultrasonic and mechanical stirring, 1 part of ammonia water (the concentration of ammonia water is 25%) was added dropwise to the Erlenmeyer flask to obtain a translucent emulsion. Then stop the ultrasound, add 10 parts of ethyl orthosilicate under magnetic stirring, react at room temperature for 20 minutes, there is precipitation, continue to stir for 4 hours, filter, wash with ethanol, centrifuge, and dry at 60°C to obtain nanometer two Silica hollow microspheres. Observed under a transmission electron microscope, it is a hollow microsphere with an average particle diameter of about 400nm and a shell thickness of about 80nm.

Embodiment 3

[0026] 1 part of nonylphenol ethoxylate ( n=4) add 100 parts of cyclohexane to the Erlenmeyer flask, and under ultrasonic and mechanical stirring, add 1 part of ammonia water (the concentration of ammonia water is 12.5%) dropwise to the Erlenmeyer flask to obtain translucent reverse phase lotion. Then stop the ultrasound, under magnetic stirring, add 3 parts of ethyl orthosilicate, react at room temperature for 30 minutes, there is precipitation, continue stirring for 8 hours, filter, wash with ethanol, centrifuge, and dry at 60 ° C to obtain nanometer two Silica hollow microspheres. Observed under a transmission electron microscope, it is a hollow microsphere with an average particle diameter of about 500nm and a shell thickness of about 30nm.

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Abstract

The invention relates to a preparation method of nanometer silica hollow microspheres. The method is characterized in that alkylphenol polyoxyethylene ether is taken as emulsifier, a water / oil liquor system is formed firstly, then a silica precursor which can be dissolved in oil phase is added, hydrolysis-condensation reaction is conducted on the precursor at the water-oil interface under aqua ammonia catalysis, and the nanometer silica hollow microspheres with uniform shell thickness and sufficient intensity are prepared after reaction for certain time and treatment.

Description

(1) Technical field [0001] The invention belongs to the technical field of nano functional materials, and in particular relates to a preparation method of nano silicon dioxide hollow microspheres. (2) Technical background [0002] Nano-hollow microsphere materials have received great attention because of their special structure, morphology and surface and interface properties. Compared with organic hollow microspheres, inorganic hollow microspheres have high thermal, optical, electrical, mechanical properties and acid and alkali stability. They are widely used as microcapsule materials in the controlled transport and release systems of drugs, dyes, cosmetics, sensitive reagents such as enzymes and proteins, and can also be used as lightweight fillers, highly selective catalysts or catalyst carriers. It is also of great value in cell and disease diagnosis. [0003] Silica hollow microspheres are one of the most important and widely concerned types. There are many preparatio...

Claims

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Application Information

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IPC IPC(8): C01B33/18B82B3/00
Inventor 王昭群胡万成李云兴王倩
Owner NANJING UNIV
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