Method for preparing nanometer hollow bar-shaped silicon dioxide materials

Abstract

The invention relates to a method for preparing nanometer hollow bar-shaped silicon dioxide materials by using nanometer crystal cellulose as templates. According to the method, the cellulose and the tetraethoxysilane are adopted as raw materials. Firstly, the cellulose raw materials are hydrolyzed by sulfuric acid with the weight concentration being 64 percent to obtain nanometer crystal cellulose with negative charges on the surface, then, cetyl trimethyl ammonium bromide is used so that the charges on the surface of the cellulose nanometer crystals are changed into positive charges, then, sol obtained through tetraethoxysilane hydrolysis is absorbed onto the surface of the cellulose nanometer crystals under the alkaline condition, and finally, silicon dioxide gel is formed through condensation polymerization, so the nanometer crystal cellulose compounds covered by the silicon dioxide is obtained through the preparation. After the compounds are subjected to freezing drying, powder is obtained, the powder is roasted in a Muffle furnace to remove the cellulose nucleus, and the nanometer hollow bar-shaped silicon dioxide materials are obtained. The cellulose nanometer crystals adopted by the method are used as the templates, raw materials are rich, the preparation is simple, in addition, the dimension and the shape of the templates can be regulated and controlled through the hydrolysis time and the intensity, the hollow bar-shaped silicon dioxide materials with the inner diameter being dozens of nanometers can be prepared, in addition, the whole experiment process is safe, and the obtained products are uniform.

Description

Technical field [0001] The invention relates to a method for preparing a nano hollow rod-shaped silica material, which belongs to the field of material science processing. Background technique [0002] In recent years, people have been committed to the manufacture of nanomaterials with special functions. Among them, nanomaterials with hollow / core-shell structures have become a new research focus. [0003] Hollow / core-shell nanomaterials are a group of materials with special morphologies, with particle sizes ranging from nanometers to micrometers. Because it has not only an outer surface, but also an inner surface, its specific surface area is much larger than that of ordinary nanomaterials. At the same time, it also has the opportunity to modify its inner and outer surfaces so that the inner and outer surfaces have different properties. Compared with solid materials of the same size, hollow materials have the obvious advantages of low density and material saving. More importantl...

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Problems solved by technology

However, most of these templates are spherical nanoparticles and microparticles, and there are few reports on other shapes of hollow nanomaterials.

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