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Spherical silicon dioxide hollow material and preparation method thereof

A spherical silica and hollow technology, which is applied in the manufacture of silica, silicon oxide, and nanostructures, can solve the problems of long reaction time and achieve the effects of simple operation, easy-to-obtain non-toxic raw materials, and mild conditions

Inactive Publication Date: 2010-08-04
NANKAI UNIV
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Problems solved by technology

The template used in this method must be prepared in advance, the silicon source must be pre-hydrolyzed, and the reaction time is long

Method used

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  • Spherical silicon dioxide hollow material and preparation method thereof
  • Spherical silicon dioxide hollow material and preparation method thereof

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Embodiment 1

[0020] Cholic acid crystals were purified by ethanol recrystallization.

[0021] At 25°C, add 0.2g of commercially available ammonia water (25%) into 32ml of water to make an aqueous ammonia solution, add 0.5g of cholic acid crystals to it, and after 2 hours, the cholic acid is completely dissolved to form a clear solution, pH 9; 0.29g3 - Aminopropyltriethoxysilane was mixed with 0.27 g of ethyl orthosilicate, added to the above-prepared solution, stirred and reacted for 0.5 hour to form a milky white emulsion-like homogeneous system. The above reactant system was left to mature at 80° C. for 15 hours. The obtained product was filtered, the filter cake was washed three times with water and 95% ethanol respectively, and dried in a drying oven at 60° C. for 6 hours to obtain a white powdery solid.

[0022] figure 1 The TEM photos of the spherical silica hollow material prepared in Example 1 are given. TEM detection shows that the obtained product has a spherical hollow struct...

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Abstract

The invention relates to a spherical silicon dioxide hollow material and a preparation method thereof. The spherical silicon dioxide hollow material is prepared from cholic acid and silicon source serving as raw materials in a molar ratio of 1: 2-6. The preparation method comprises the following steps: dissolving the cholic acid into aqueous solution of ammonia to form alkali aqueous solution of cholic acid ammonium salt, reacting the alkali aqueous solution with the silicon source with stirring, standing and ageing the solution, filtering a reaction product, and flushing and drying the product. The silicon source is a mixture of 3-aminopropyltriethoxysilane and ethyl orthosilicate in a ratio of 1: 1-5. The grain diameter of the spherical silicon dioxide hollow material is 100 to 1,000 nanometers, and the wall thickness is 50 nanometers. A micro-molecular biological surfactant is used as a template, an organic solvent is not used in the reaction, a template agent does not need to be further removed, the raw materials are easily obtained and are nontoxic, the operation is simple and convenient, and the conditions are mild. The silicon dioxide hollow material prepared by the method is particularly applicable in biomedicine related fields of medicament delivery, active guest molecule protection and the like.

Description

technical field [0001] The invention belongs to the field of inorganic nanomaterials, and in particular relates to a spherical silica hollow material and a preparation method thereof, specifically a spherical silica micro-nano hollow material based on a biosurfactant cholate as a template and a preparation method thereof. Background technique [0002] Micro / nano hollow spheres with regular structure have attracted more and more attention due to their potential wide application in many fields such as catalysis, chromatography, protection of biologically active reagents, fillers (pigments, coatings), pollutant treatment, and release systems for large biomolecules. growing interest. Silica hollow materials have many excellent properties, such as low density, low toxicity, good mechanical and thermal stability, high biocompatibility, etc., and can be widely used in fillers, coatings, catalyst carriers, drug delivery and biochemical reagent protection, etc. field, which has arou...

Claims

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Application Information

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IPC IPC(8): C01B33/18B82B3/00
Inventor 任怡柳开郎余竹芳陆燕王旭东李晨曦
Owner NANKAI UNIV
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