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A kind of preparation method of hierarchical mesoporous silica nanoparticles

A mesoporous silica and nanoparticle technology, applied in the direction of silica, silicon oxide, nanotechnology, etc., can solve the problems of harsh synthesis conditions, high cost, and easy aggregation of particles, and achieve a wide range of pore size distribution and reduce Synthetic cost, the effect of reducing environmental pollution

Active Publication Date: 2015-08-19
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Co-surfactants using conventional cationic surfactants enable the preparation of highly monodisperse hierarchical mesoporous SiO 2 Nanoparticles, but the size is often larger than 150 nm, and the resulting particles are easy to aggregate and not easy to form a stable colloidal suspension
It can be seen from the above reports that the existing synthetic methods have disadvantages such as harsh synthetic conditions, high cost, low yield, and large pollution.

Method used

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  • A kind of preparation method of hierarchical mesoporous silica nanoparticles
  • A kind of preparation method of hierarchical mesoporous silica nanoparticles
  • A kind of preparation method of hierarchical mesoporous silica nanoparticles

Examples

Experimental program
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Effect test

Embodiment 1

[0020] First, 1.63 g of 1-hexadecyl-3-methylimidazolium trifluoromethanesulfonate (C 16 -ILs) was added to a solution containing 100 ml deionized water and 3.7 g triethanolamine (TEAH 3 ) in a beaker at a constant temperature of 80°C for 1 hour until the solution becomes clear, then quickly add 14.6 g of tetraethoxysilicate (TEOS) into the beaker, and continue to stir at a constant temperature of 80°C for 2 hours to obtain a milky white colloidal state suspension, the molar composition of the mixture is SiO 2 : C 16 -ILs : TEAH 3 : H 2 O = 1 : 0.06 : 1.0 : 80; the obtained mixture was centrifuged, washed, and dried to obtain the hierarchical mesoporous SiO 2 Nanoparticles, yield 70%, average particle size 45 nm ( figure 1 and figure 2 ). The specific surface area of ​​the particles is 834 m 2 / g, 1.87 ml / g, the pore size ranges from 2 to 20 nm.

Embodiment 2

[0022] First, 1.63 g of 1-dodecyl-3-methylimidazolium trifluoromethanesulfonate (C 12 -ILs) was added to a solution containing 100 ml deionized water and 3.7 g triethanolamine (TEAH 3 ) in a beaker at a constant temperature of 80°C for 1 hour until the solution becomes clear, then quickly add 14.6 g of tetraethoxysilicate (TEOS) into the beaker, and continue to stir at a constant temperature of 80°C for 2 hours to obtain a milky white colloidal state suspension, the molar composition of the mixture is SiO 2 : C 12 -ILs : TEAH 3 : H 2 O = 1 : 0.06 : 1.0 : 80; the obtained mixture was centrifuged, washed, and dried to obtain the hierarchical mesoporous SiO 2 Nanoparticles, yield 75%, average particle size 200 nm ( image 3 and Figure 4 ). The specific surface area of ​​the particles is 1034 m 2 / g, the pore volume is 1.27 ml / g, and the pore diameter ranges from 3.6 to 60 nm.

Embodiment 3

[0024] Except that tetramethoxysilicate (TMOS) was used instead of tetraethoxysilicate (TEOS) in Example 1, other preparation conditions were the same as in Example 1, and the hierarchical mesoporous SiO 2 The average particle size of nanoparticles is 30 nm. The specific surface area of ​​the particles is 804 m 2 / g, the pore volume is 1.97 ml / g, and the pore diameter ranges from 2.6 to 20 nm.

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Abstract

The invention discloses a preparation method for multilevel mesoporous silica nanoparticles. According to the method, a long-chain ionic liquid surfactant is adopted as a template agent, organic small molecular amine is taken as an alkali source, tetraalkyl silicate ester is used as a silicon source, and deionized water is taken as a water source. For the raw materials, the silicon source, the ionic liquid surfactant, the organic small molecular amine and water are in a mole ratio of 1:0.01-0.3:0.001-8.0:40-1000. According to the invention, the particle size can be effectively regulated in a range of 20-200nm. The synthesized mesoporous SiO2 nanospheres are uniform in size, have a specific surface area of 1000m<2> / g, a pore volume of 2.0ml / g, and a pore diameter of 2-30nm, and have an obvious divergent pore channel structure from the inside out, i.e. a so-called multilevel mesoporous structure. The synthesis method provided by the invention has the advantages of simplicity, easy scalization, short cycle, low cost and good repeatability, thus being an environmental friendly synthetic strategy.

Description

technical field [0001] The invention belongs to the field of inorganic chemical synthesis, and relates to a preparation method of mesoporous molecular sieves, in particular to a preparation method of multilevel mesoporous silicon dioxide nanoparticles. Background technique [0002] Hierarchical mesoporous silica nanoparticles, also known as dendritic pore structure mesoporous silica nanoparticles (Denderimer-like mesoporous silica nanoparticles) or mesoporous silica nanoparticles with divergent pore structure, is a New inorganic nanomaterials with high specific surface area, large pore volume, and controllable shape and size have attracted widespread attention in recent years in the fields of catalysis and material science, biomedicine, environmental protection, and biosensors. The current templates for the synthesis of mesoporous silica nanoparticles (MSNs) mainly use traditional cationic surfactant molecules, such as cetyltrimethylammonium bromide (CTABr, Angew. Chem. Int....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12B82Y30/00B82Y40/00
Inventor 张坤邢俊玲宋正芳薛青松虞叶骏杨太群马晓静
Owner EAST CHINA NORMAL UNIV
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