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Preparation method of mesoporous silica suspension with stable colloidal state

A technology of mesoporous silica and suspension, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of agglomeration, coagulation, poor colloidal stability, etc., and achieves low synthesis cost and simple preparation method. Effect

Active Publication Date: 2015-07-08
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the synthesis method is simple to prepare, the colloidal stability of the obtained particles is extremely poor after ultrasonic dispersion, and severe agglomeration and coagulation are prone to occur after a few minutes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] Preparation of Mesoporous Silica Nanoparticles:

[0018] First, 2.74g of cetyltrimethylammonium p-toluenesulfonate (CTATos) was added to 144ml of deionized water, 0.38g of triethanolamine (TEAH 3 ) in a beaker, stirred at 80°C for 1 hour until the solution became clear, then quickly added 20.83g of tetraethoxysilicate (TEOS) into the beaker, and continued to stir at 80°C for 2 hours to obtain a white precipitate. The molar ratio of the components of the mixture is SiO 2 :CTATos:TEAH 3 :H 2 O = 1:0.06:0.026:0.02:80; the obtained mixture is directly suction filtered, washed and dried to obtain mesoporous SiO 2 Nanoparticles, yield 85%, average particle size 100 nm.

Embodiment 1

[0020] First, grind 1.0 g of the mesoporous silica powder prepared above using a mortar to obtain an ultrafine powder, add it to 100 ml of 90% ethanol solution, ultrasonically disperse it for 15 minutes, and use NaOH (0.1M) solution to adjust The pH value of the system was 8.0-9.0; then transferred to a 200 ml reaction kettle, stirred at 60°C for 12 hours, centrifuged, washed three times with absolute ethanol, and then dispersed in absolute ethanol by ultrasonication for 15 minutes to obtain a gel It is a stable mesoporous silica suspension with no obvious coagulation within 24 hours.

Embodiment 2

[0022] First, 1.0 g of the mesoporous silica powder prepared above was ground evenly with a mortar, added to 100 ml of 90% ethanol solution, ultrasonically dispersed for 15 minutes, and the pH value of the system was adjusted using ammonia (28%) solution at 8.0-9.0; then transferred to a 200 ml reaction kettle, stirred at 60°C for 12 hours, centrifuged, washed three times with absolute ethanol, and then dispersed in absolute ethanol by ultrasonication for 15 minutes to obtain a colloidally stable medium Porous silica suspension, no obvious coagulation occurred within 24 hours.

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Abstract

The invention discloses a preparation method of a colloidally stable mesoporous silica suspension. The method is to grind the hydrothermally synthesized mesoporous silica nanoparticles into an ultrafine powder and prepare a solid-to-liquid ratio of 0.001-1.0% silicon dioxide solution, then adjust the pH value between 8.0-10.0 with inorganic / organic base, then transfer the above solution to the reaction kettle, control the reaction temperature and stirring time, centrifuge, anhydrous ethanol After washing several times, a powder product was obtained, which was redispersed in absolute ethanol and subjected to ultrasonic treatment to obtain a colloidal stable mesoporous silica suspension. The invention effectively solves the technical problem of storage and redispersion of mesoporous silica nanoparticles; the synthesis method is simple, easy to scale up, short in cycle, low in cost and good in repeatability, and is an environmentally friendly synthesis method.

Description

technical field [0001] The invention relates to the technical field of inorganic chemical synthesis, in particular to a method for preparing a colloidally stable mesoporous silica suspension. Background technique [0002] Mesoporous silica nanomaterials are a new type of inorganic nanomaterials with high specific surface area, large pore volume, controllable shape and size, etc. Applied research has attracted widespread attention. The current main strategies for synthesizing mesoporous silica nanoparticles (MSNs) include: first, using a single cationic surfactant CTAB as a template (Angew. Chem. Int. Ed., 2002, 2151, 2317.), in In the early stage of the reaction, mesoporous silica nanoparticles with a size of less than 100 nm were prepared by using a large amount of water dilution method to quench the particle growth, but the prepared silica particles could not overcome the irregular shape and size distribution. Uniform and other defects; second, through the improved St?be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/145
Inventor 张坤杨太群宋正芳刑俊玲虞叶骏薛青松郑惠萍
Owner EAST CHINA NORMAL UNIV