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Shape-controlled mesoporous silica nano-material and preparation method thereof

A nanomaterial and mesoporous silicon technology, applied in the field of mesoporous silicon nanomaterials and their preparation, can solve the problems of small specific surface area and pore volume, porous silicon without regular morphology, disordered pore structure, etc., and achieve high pore volume. , the effect of controllable morphology and ordered pore structure

Inactive Publication Date: 2013-07-17
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In summary, although there are many methods for synthesizing porous silicon, the common disadvantage is that most of the obtained porous silicon has irregular morphology, disordered pore structure, and relatively small specific surface area and pore volume. Features limit its applications in optics and drug delivery

Method used

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  • Shape-controlled mesoporous silica nano-material and preparation method thereof
  • Shape-controlled mesoporous silica nano-material and preparation method thereof
  • Shape-controlled mesoporous silica nano-material and preparation method thereof

Examples

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Embodiment 1

[0043] A method for preparing a shape-controllable mesoporous silicon nanomaterial, specifically comprising the following steps:

[0044] First, using mesoporous silica micronanoparticles as the precursor, using magnesium powder as the reducing agent, calculated according to the molar ratio, that is, the ratio of mesoporous silica micronanoparticles:magnesium powder is 1:0.1, that is, 6.0g Mesoporous silica micro-nano particles and 2.4g of magnesium powder are mixed evenly in a stainless steel reactor;

[0045] The shape of the mesoporous silica micro-nano particles used is rod-like;

[0046] The mesoporous silica micro-nanoparticles used above are prepared by the following methods:

[0047] Weigh 1.8 grams of P123 (the P123 is a triblock copolymer Pluronic P123 (Sigma-Aldrich Company)), add 80mL of 2M HCl and 3 grams of potassium chloride respectively, stir at 38°C for 1.5h, and wait until the P123 is completely dissolved. Add 2.0 grams of tetraethyl orthosilicate (TEOS), s...

Embodiment 2

[0060] A method for preparing a shape-controllable mesoporous silicon nanomaterial, specifically comprising the following steps:

[0061] First, using mesoporous silica micronanoparticles as the precursor, using magnesium powder as the reducing agent, calculated according to the molar ratio, that is, the ratio of mesoporous silica micronanoparticles:magnesium powder is 1:5, that is, 0.6g Mesoporous silica micro-nano particles and 1.2g of magnesium powder are mixed evenly;

[0062] The shape of the mesoporous silica micro-nano particles used is ellipsoidal;

[0063] The ellipsoidal mesoporous silica micro-nanoparticles used above are prepared by the following methods:

[0064] Weigh 1.8g of P123, add 80mL of 2M HCl, 5.6g of potassium chloride and 2.6g of ethanol respectively, stir at 38°C for 1.5h, wait until P123 is completely dissolved, add 2.12g of TEOS, stir vigorously for 10min, keep the temperature at 38°C, and let it stand for 24h Put the obtained reactant into a 100mL...

Embodiment 3

[0073] A method for preparing a shape-controllable mesoporous silicon nanomaterial, specifically comprising the following steps:

[0074] First, using mesoporous silica micronanoparticles as the precursor, using magnesium powder as the reducing agent, according to the molar ratio calculation, that is, the ratio of mesoporous silica micronanoparticles:magnesium powder is 1:2.5 and 1.0g of mesoporous Porous silica micro-nano particles and 1.0g of magnesium powder are mixed evenly;

[0075] The shape of the mesoporous silica micro-nano particles used is rod-like;

[0076] The mesoporous silica micro-nanoparticles used above are prepared by the following methods:

[0077] Weigh 1.5 g of P123, add 100 mL of 2M HCl and 4.5 g of potassium chloride respectively, stir at 38 °C for 1.5 h, wait until P123 is completely dissolved, add 2.0 g of TEOS, stir vigorously for 10 min, keep the temperature at 38 °C, and let it stand for 24 h Put the obtained reactant into a 100mL polytetrafluoro...

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Abstract

The invention discloses a shape-controlled mesoporous silica nano-material and a preparation method thereof. The preparation method comprises the steps of: firstly, taking mesoporous silica micro-nano particles as precursors, using magnesium powder as a reducing agent, controlling the heating rate at 0.1-5 DEG C / min, heating to 500-800 DEG C to carry out magnesium thermal reduction reaction for 2-12 hours, as to obtain the shape-kept mesoporous silica / magnesium oxide compound; then removing reaction product magnesium oxide and residual silica by hydrochloric acid and hydrofluoric acid solution respectively, so as to obtain corresponding shape-controlled mesoporous silica nano-material; preparing corresponding shape-controlled mesoporous silica nano-material when the mesoporous silica micro-nano particles with different shapes are adopted as the precursors; finally obtaining the mesoporous silica nano-material which has an ordered duct structure, wherein the specific surface area is 150-360m<2> / g; the aperture is 7.0-10.6nm; and the pore volume is 0.3-0.8cm<3> / g. Furthermore, the method is simple in preparation step, low in cost, and suitable for large-scale production.

Description

technical field [0001] The invention relates to a shape-controllable mesoporous silicon nanometer material and a preparation method thereof, belonging to the field of inorganic nanometer materials. Background technique [0002] Mesoporous silicon has high specific surface area, photoluminescent properties, and diversity of morphology and structure, and has been widely used in the fields of optical devices, sensors, and biomedicine. Since porous silicon was first reported to emit strong fluorescence in the near-infrared and visible light regions in 1990, it has aroused intense interest among researchers because of its unique photoluminescence properties. Because porous silicon has a large specific surface area, it can absorb a large number of molecules in the external environment. And when porous silicon adsorbs sensitive molecules, its optical properties such as photoluminescence and effective refractive index will change accordingly, and this qualitative response can be us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/023B82Y30/00B82Y40/00
Inventor 沈绍典吴玉昭曲青毛东森卢冠忠
Owner SHANGHAI INST OF TECH
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