CN1186253C - Prepn of mesoporous spherical nano Sio2 particle - Google Patents
Prepn of mesoporous spherical nano Sio2 particle Download PDFInfo
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- CN1186253C CN1186253C CNB031421776A CN03142177A CN1186253C CN 1186253 C CN1186253 C CN 1186253C CN B031421776 A CNB031421776 A CN B031421776A CN 03142177 A CN03142177 A CN 03142177A CN 1186253 C CN1186253 C CN 1186253C
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Abstract
The present invention relates to a preparation method of mesoporous spherical nanometer silicon dioxide particles, which comprises the steps as follows: firstly, deionized water, hexadecyl trimethyl ammonium bromide, tetraethyl silicate, the water solution of sodium hydroxide or ammonia water and alcohol solvents (containing methanol, alcohol, propyl alcohol and butanol) are mixed to a scale to prepare a reaction solution; then, the uniformly stirred reaction solution is put in a polytetrafluoroethylene reactor with a stainless steel protective casing, and put in a blast oven for temperature reaction; finally the obtained solution is filtrated, washed and roasted at high temperature to prepare mesoporous spherical nanometer silicon dioxide particles with uniform sizes. The present invention has the advantages of simple operation, low cost, short production period, little and uniform particle sizes of the mesoporous silicon dioxide particles, regular shape and high ordered pore canal.
Description
Technical field:
The present invention relates to a kind of preparation method of mesoporous silica spheres shape nano particle, be specifically related to adopt Hydrothermal Preparation mesoporous silica spheres shape nano particle.Belong to chemistry and inorganic materials class technical field.
Background technology:
According to the definition of International Union of Pure and Applied Chemistry (IUPAC), mesoporous material is meant the porous material of aperture between 2～50 nanometers.It is the same with poromerics to have regular pore structure, big specific surface area and pore volume, but the aperture but can between 1.5 to 10nm, regulate, when catalyzed reaction that relates to the large size molecule or fractionation by adsorption, highlight its uniqueness.Prepare mesoporous material with template, not only preparation condition is simple relatively, and seems more flexible at aspects such as the chemical constitution of material and profile controls.These materials are having important effect aspect the industrial application such as catalysis, fractionation by adsorption, and demonstrate tempting scientific research value and potential using value at aspects such as optics, electronics and biologies.Can be applied to photocatalyst, advanced low-k materials, solid laser material, sensitive material.
In order to satisfy the needs of using, mesoporous material also must have suitable profile, for example particle, film, fiber, monolithic and special shape.The preparation condition of mesoporous material is looser, therefore can use the profile of appropriate means control material.By can obtain the mesoporous material of shapes such as film, fiber to the control of alr mode and speed.As document (Robert I.Nooney, Dhanasekaran Thirunavukkarasu, et al.Synthesis of Nanoscale Mesoporous Silica Spheres with Controlled Particle Size.Chem.Mater.2002,14,4721-4728) described, in recent years, the profile control method of mesoporous material had had very big development, yet the pattern of product is general and irregular, well-balanced.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, a kind of preparation method of mesoporous silica spheres shape nano particle is provided, simple to operate, cost is low, and the nano particle diameter that makes is little, neat appearance, the even and high-sequential in duct.
For realizing such purpose, in the technical scheme of the present invention, adopt the Hydrothermal Preparation mesoporous silica nano-particle.At first the aqueous solution and the alcohols cosolvent with solvent, tensio-active agent, silicon source, catalyzer mixes by a certain percentage, is prepared into reaction solution.Then the reaction soln that stirs is inserted in the tetrafluoroethylene reactor of stainless steel protection shell; and place convection oven, after the temperature reaction, with the solution filtration washing of gained; through high-temperature roasting, can obtain spheric mesoporous silica nano-particle of uniform size again.
Preparation method of the present invention comprises following concrete steps:
1. the preparation of reaction solution: the aqueous solution and the alcohols cosolvent of deionized water (solvent), cetyl trimethylammonium bromide (tensio-active agent), positive tetraethyl orthosilicate (silicon source), catalyzer are mixed, molar ratio between each composition is 2486～1736: 0.123: 1: 0.63: 0～233, stir several minutes under the room temperature.
2. building-up process: above-mentioned mixing solutions is poured in the reactor of tetrafluoroethylene, reactor is put into the stainless steel protection shell, place convection oven then, be warming up to 100～120 ℃, isothermal reaction 12～24 hours.
3. aftertreatment: after reaction is finished, solution in the reactor is filtered and use deionized water wash, place 50 ℃ baking oven drying to obtain powder the gained filter cake, powder is placed retort furnace, be warming up to 550 ℃ and constant temperature 6 hours, and promptly got the spheric mesoporous silica nano-particle.
The mesoporous silica nano-particle that the present invention makes is approximate spherical in shape, and size distribution is 50～80nm, and the aperture is approximately 3 nanometers, the duct long-range order.
The aqueous solution of catalyzer of the present invention is the aqueous solution of sodium hydroxide or ammoniacal liquor, and the alcohols cosolvent is methyl alcohol, ethanol, n-propyl alcohol or propyl carbinol.
The inventive method is simple to operate, cost is low, and the production cycle is shorter.Owing to adopted alcohol to make cosolvent, in the synthetic process, relaxed the reactive force between the surfactant micelle, make the arrangement high-sequential in duct; Adopted alkaline solution to make catalyzer on the other hand, the micella of generation is shorter, causes the particle grain size that generates less, evenly.The hydrothermal method temperature of reaction that the present invention adopts is not high, and reaction raw materials is cheap, and the mesoporous silica particles particle diameter of generation is no more than 100 nanometers, neat appearance, and big or small homogeneous, and duct high-sequential, the aperture is 3 nanometers
Description of drawings:
Fig. 1 is the transmission electron microscope photo of the embodiment of the invention 1 resulting mesoporous silica nano-particle.
Fig. 2 is the transmission electron microscope photo enlarged view in the duct of the embodiment of the invention 1 resulting mesoporous silica nano-particle.
Fig. 3 is the x-ray diffraction pattern of the embodiment of the invention 1 resulting mesoporous silica nano-particle.
Embodiment:
The following examples are to further specify of the present invention, rather than limit the scope of the invention.
Embodiment 1:
1. in the Erlenmeyer flask of a 50ml, 0.35 milliliter of 2 mol aqueous sodium hydroxide solution, 8 milliliters of ethanol and 0.05 gram cetyl trimethylammonium bromide, 0.25 milliliter of positive tetraethyl orthosilicate are mixed with 40 ml deionized water.Stirred 30 minutes under the room temperature.
2. building-up process: above-mentioned mixing solutions is poured in the reactor of about 50 milliliters tetrafluoroethylene, reactor is put into the stainless steel protection shell, screw lid.In convection oven, be warming up to 100 ℃, constant temperature 24 hours.
3. aftertreatment: after reaction is finished, solution in the reactor is filtered and washing, place 50 ℃ baking oven drying to obtain powder the gained filter cake, powder is placed retort furnace, be warming up to 550 ℃ and constant temperature 6 hours, the gained powder is the spheric mesoporous silica nano-particle.
The transmission electron microscope photo of resultant mesoporous silica nano-particle such as Fig. 1, the particle diameter of prepared as seen from Figure 1 mesoporous silica particles all are no more than 100 nanometers than homogeneous, are the 50-80 nanometer.The transmission electron microscope photo of the prosperity of nano particle as shown in Figure 2, as can be seen from the figure, the aperture long-range order, the aperture is approximately 3 nanometers.The X-ray diffraction spectrogram as shown in Figure 3, four diffraction peaks are corresponding to (100), (110), (200) and (210) four faces of p6mm structure as seen from Figure 3, reflected that mesoporous particles has the hole arrangement of long-range order, can calculate the size of portalling by the d value simultaneously is 3 nanometers.
Embodiment 2:
1. in the Erlenmeyer flask of a 50ml, aqueous sodium hydroxide solution, 0.05 gram cetyl trimethylammonium bromide, 0.25 milliliter of positive tetraethyl orthosilicate of 0.35 milliliter of 2 mol mixed with 50 ml deionized water.Stirred 30 minutes under the room temperature.
2. building-up process: above-mentioned mixing solutions is poured in the reactor of tetrafluoroethylene, reactor is put into the stainless steel protection shell, screw lid.In convection oven, be warming up to 120 ℃, constant temperature 12 hours.
3. aftertreatment: after reaction is finished, solution in the reactor is filtered and washing, place 50 ℃ baking oven drying to obtain powder the gained filter cake, powder is placed retort furnace, be warming up to 550 ℃ and constant temperature 6 hours, the gained powder is the spheric mesoporous silica nano-particle.
Embodiment 3:
1. in the Erlenmeyer flask of a 50ml, 0.14 gram sodium hydroxide powder, 8 milliliters of propyl carbinols, 0.05 gram cetyl trimethylammonium bromide and 0.25 milliliter of positive tetraethyl orthosilicate are mixed with 40 ml deionized water.Stirred 30 minutes under the room temperature.
2. building-up process: above-mentioned mixing solutions is poured in the reactor of tetrafluoroethylene, reactor is put into the stainless steel protection shell, screw lid.In convection oven, be warming up to 120 ℃, constant temperature 24 hours.
3. aftertreatment: after reaction is finished, solution in the reactor is filtered and washing, place 50 ℃ baking oven drying to obtain powder the gained filter cake, powder is placed retort furnace, be warming up to 550 ℃ and constant temperature 6 hours, the gained powder is the spheric mesoporous silica nano-particle.
Claims (1)
1, a kind of preparation method of mesoporous silica spheres shape nano particle is characterized in that comprising the steps:
1) aqueous solution, ethanol or the propyl carbinol of deionized water, cetyl trimethylammonium bromide, positive tetraethyl orthosilicate, sodium hydroxide mixed make reaction solution, the molar ratio between each composition is 1736～2486: 0.123: 1: 0.63: 0～233;
2) above-mentioned reaction solution is poured in the tetrafluoroethylene reactor of stainless steel protection shell, placed convection oven then, be warming up to 100～120 ℃, isothermal reaction 12～24 hours;
3) after reaction is finished, solution filtration, washing, drying in the reactor are obtained powder, powder is placed retort furnace, be warming up to 550 ℃ and constant temperature 6 hours, promptly get the spheric mesoporous silica nano-particle.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101837981A (en) * | 2010-04-30 | 2010-09-22 | 南开大学 | Multilevel porous structure mesoporous silica material and preparation method thereof |
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| CN100447081C (en) * | 2005-09-15 | 2008-12-31 | 成都理工大学 | Method of preparing spherical nanometer SiO2 using powder quartz by chemical precipitation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101837981A (en) * | 2010-04-30 | 2010-09-22 | 南开大学 | Multilevel porous structure mesoporous silica material and preparation method thereof |
| CN101837981B (en) * | 2010-04-30 | 2012-05-23 | 南开大学 | Multilevel porous structure mesoporous silica material and preparation method thereof |
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