Synthesis method of monodispersed nano-mesopore silicon dioxide material

A nano-mesoporous, silica technology, applied in chemical instruments and methods, molecular sieves and base exchange compounds, inorganic chemistry, etc., can solve the problems of aggregates affecting performance and application, restricting applications, easy agglomeration, etc., to achieve orderly Good performance, high specific surface area, high specific surface area effect

Inactive Publication Date: 2005-05-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nanoscale MCM-41 powder has a double nanostructure, that is, nanoscale particle size and nanoscale mesoporous structure. It is expected to be used in many important fields, but like other nanopowders, it is very easy to use due to its special surface structure. Agglomeration, the existence of aggregates seriously affects its performance and application
However, the domestic research on solving the problem of nano-mesoporous silica powder agglomeration is still blank, which greatly limits its application.

Method used

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  • Synthesis method of monodispersed nano-mesopore silicon dioxide material
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  • Synthesis method of monodispersed nano-mesopore silicon dioxide material

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Experimental program
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Effect test

Embodiment 1

[0024] Dissolve 6.0g of hexadecyltrimethylammonium bromide and 10.56g of F127 (PEO-PPO-PEO, average molecular weight 11000) in 600g of ammonia solution (36.96g of ammonia water), fully stir at 35°C, and wait until After the surfactant is completely dissolved, add 20g of tetraethyl orthosilicate, stir continuously at room temperature for 2 hours to obtain a transparent sol, transfer it to a constant temperature drying oven, dry the water at 100°C to obtain a white powder, and roast at a high temperature of 550°C for 6 hours. The final monodisperse nanometer mesoporous silica material is obtained.

[0025] figure 1 (b) is the particle transmission electron microscope photo of the sample. The transmission electron microscope photo shows monodisperse uniform spherical particles with a particle size of 70-80nm, and the XRD spectrum shows an ordered hexagonal mesoporous structure. image 3 (a) and image 3 (b) is the nitrogen adsorption-desorption curve and the pore distribution c...

Embodiment 2

[0027] Dissolve 5.2g of dodecyltrimethylammonium bromide and 10.56g of F127 (PEO-PPO-PEO, average molecular weight 11000) in 600g of ammonia solution (61.60g of ammonia water), fully stir at 30°C, and wait until After the surfactant is completely dissolved, add 20g of tetraethyl orthosilicate, stir continuously at 30°C for 4 hours to obtain a transparent sol, transfer it to a constant temperature drying oven, dry the water at 80°C to obtain a white powder, and roast at 550°C for 6 hours , to obtain the final monodisperse nanometer mesoporous silica material.

[0028] The transmission electron microscope photos show monodisperse uniform spherical particles with a particle size of about 100nm, the XRD spectrum shows an ordered hexagonal mesoporous structure, the nitrogen adsorption and desorption spectrum shows a mesoporous structure with uniform pore size distribution, and the specific surface area is 900m 2 / g or so, the pore size is 2-3nm.

Embodiment 3

[0030] Dissolve 6.0g cetyltrimethylammonium bromide and 5.28g F127 (PEO-PPO-PEO, average molecular weight 11000) in 1500g sodium hydroxide solution (2M sodium hydroxide 14.5ml), at 80°C Stir thoroughly, after the surfactant is completely dissolved, add 20g of tetraethyl orthosilicate, and stir continuously at 40°C for 1 hour to obtain a transparent sol, transfer it to a constant temperature drying oven, dry the water at 80°C to obtain a white powder, and store at 550°C Calcined at high temperature for 10 hours to obtain the final monodisperse nanometer mesoporous silica material.

[0031] figure 1 (a) is the transmission electron microscope photo of the particle, the transmission electron microscope photo shows monodisperse uniform spherical particles with a particle size of 50-60nm, the XRD spectrum shows an ordered hexagonal mesoporous structure, and the nitrogen adsorption and desorption spectrum shows the pore size Uniformly distributed mesoporous structure with a specifi...

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Abstract

An individually dispersed mesoporous nano-SiO2 is prepared through preparing reaction sol by using cationic surfactant as template agent and triblock non-ionic surfactant as template agent aid and disperser, and synthesizing the product. Its advantages are high dispersity, ordered mesoporous arteries, and large specific surface area and pore volume.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanometer materials, and in particular relates to a method for synthesizing a monodisperse nanometer mesoporous silicon dioxide material. technical background [0002] In 1992, Mobil Corporation of the United States launched the M41S series mesoporous molecular sieves for the first time. Such materials have broad application prospects in catalysis, adsorption and separation, sensors, optical materials, biochips, organic-inorganic nanocomposites, and chemical-mechanical polishing abrasives. Among them, MCM-41 has attracted the attention of scholars at home and abroad because of its uniform hexagonal arrangement of mesoporous channels, high specific surface area, good thermal stability and potential catalytic performance. At present, people have made great progress in the preparation of MCM-41, and have successively synthesized hexagonal mesoporous films, blocks, fibers, micron powders and nanopo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/00
Inventor 张劲松梁艳张军旗
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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