KR20030072836A - Fabrication of hollow spheres and tubes of iron(III) oxide - Google Patents

Abstract

PURPOSE: A hollow sphere and tube manufactured using iron(III) oxide is provided which is used as catalyst for treating carbon monoxide and nitrogen oxide and applied to fabrication of electronic circuit, and a manufacturing method of the hollow sphere and tube manufactured using iron(III) oxide is provided. CONSTITUTION: The manufacturing method of hollow sphere and tube manufactured using iron(III) oxide comprises the steps of dissolving iron(III) acetoacetate into a biphilicity solvent; applying the dissolved solution to water having pH of 9 to 12 in which spherical and fiber type templates are dispersed so that an iron oxide film is formed on the surface of the templates; aging the mixture at the temperature range of 0 to 200 deg.C for 10 minutes to 24 hours; drying the washed mixture after washing the surface of the aged mixture; and removing the templates by burning the templates at temperature of about 600 deg.C, or decomposing the templates using acid or base according to nature of the templates so that the hollow sphere is obtained in case of spherical template, and tube is obtained in case of fiber type template, wherein the ion(III) oxide is reduced to iron by being reacted with carbon monoxide, hydrogen and incompletely oxidized nitrogen in any step, wherein the spherical template includes toluene, benzene, polystyrene dissolved toluene and benzene, hexane, mineral oil and paraffin oil, and surfactant such as TWEEN and cetyl ammonium bromide is additionally added to the spherical template, and wherein the fiber type template includes hair of animal, silk thread, cotton yarn, PET yarn and polylactate yarn.

Description

Tools, tubes and manufacturing methods made of iron oxide {Fabrication of hollow spheres and tubes of iron (III) oxide}

In the present invention, various organic materials are used as templates, and the iron oxide precursors are coated with iron oxides, and the organic materials are heated and removed or chemically removed to prepare iron and iron tools and tubes ranging from nano size to micron size. will be.

The present invention is to produce micro-hole spheres and tubes of iron oxide, iron that can be applied to the production of catalysts and electronic circuits.

Iron (III) acetoacetate is dissolved in an affinity solvent and added to water between pH 9-12, where the template is spread, to form an iron oxide film on the surface of the template. After the mixture is aged between 0 and 200 degrees Celsius for 10 minutes-24 hours, the surface is washed and dried, and then burned and removed from the template at 600 degrees Celsius, or decomposed into acid or base depending on the properties of the template. In the case of a template, a tube is obtained in the case of a tool or a fiber-shaped template. Iron oxide can be reduced to iron at any stage by reaction with carbon monoxide, hydrogen and incomplete nitrogen oxides.

Example 1

Add a few drops of iron (III) acetoacetate THF solution prepared in a concentration of 10% by weight to 1 mL of toluene and pH 10 water and stir vigorously until the spherical particles do not disappear. If the spherical particles remain in the form without stirring, they are left at room temperature for about 6 hours and then the spherical particles are removed and washed in water. Slowly blowing off toluene yields a spherical iron oxide precursor.

Example 2

An emulsion is prepared by vigorously stirring 1 mL of toluene in which 5% polystyrene and 3% TWEEN are dissolved and water at pH 12. At this time, the size of the particles is 10-100nm using the ultrasonic generator, 1-5 micrometers using the homogenizer, and a sphere having a diameter of 10-50 micrometers can be obtained by stirring with a vortex or by hand. Spherical iron oxide / polystyrene tools are obtained by adding several parts of iron (III) acetoacetate THF solution in a 10% weight ratio to the emulsion and aging for 4 hours at room temperature to 70 degrees Celsius. After drying in air, they are placed in a quartz tube flowing with carbon monoxide and left at 80 degrees Celsius for 24 hours to reduce iron oxide to obtain an iron / polystyrene tool. The iron / polystyrene tool is heated slowly to 600 degrees Celsius and left at 600 degrees for 24 hours to burn and remove polystyrene to obtain iron tools.

Example 3

An emulsion is prepared by vigorously stirring 1 mL of toluene in which 5% polystyrene and 3% TWEEN are dissolved and water at pH 12. After adding several rooms of the iron (III) acetoacetate THF solution in a concentration of 10% by weight and aging for 4 hours at 70 degrees Celsius at room temperature, it is cooled to room temperature and washed with water to obtain a spherical iron oxide / polystyrene precursor. The obtained whole body is taken out, dried in air, and gradually heated to 600 degrees Celsius, and left at 600 degrees for 24 hours to obtain an iron oxide precursor. The obtained iron oxide precursor was left for 4 to 12 hours at 100 to 200 degrees Celsius with carbon monoxide flowing from a quartz tube to obtain a reduced iron tool.

Example 4

Place hair or human hair in pH 10 water, add a few drops of iron (III) acetyl acetate THF solution prepared at 10% concentration, and leave at room temperature for 24 hours. The obtained material is heated at 600 degrees Celsius to remove the hair, which results in a tube of iron oxide.

Example 5

0.1 g of silk thread is added to 5 mL of water at pH 10, and 0.5 mL of iron (III) acetyl acetate and 10% THF solution are added thereto, followed by 4 to 24 hours at room temperature. The product obtained is washed with water and dried in air and then placed in a quartz tube with carbon monoxide and heated to 100-200 degrees Celsius for 12-24 hours. The obtained product was gradually raised to 600 degrees and left at 600 degrees for 24 hours to burn off the silk thread to obtain an iron tube.

Example 6

0.1 g of polyester yarn is added to 5 mL of water at pH 11, and 0.5 mL of iron (III) acetyl acetate 10% acetone solution is added thereto and left at room temperature for 4 to 24 hours. The obtained product was washed with water, dried in air and gradually heated to 600 degrees Celsius in a tubular furnace and left at 600 degrees for 24 hours to burn off the polyester yarn to obtain an iron oxide tube. The resulting iron oxide tube was placed in a quartz tube and carbon monoxide was flowed and heated at 100 ° C. to 200 ° C. for 12-24 hours to obtain an iron tube.

The present invention can be used to produce hollow spheres and tubes made of iron oxide can be used as a catalyst for treating carbon monoxide and nitric oxide, reducing them can produce a fine electric tool and tube made of iron to various magnetic materials It can be applied.

Claims (7)

The iron (III) acetoacetate is added to a water mixture of pH 8-12 containing spherical and linear templates to coat the template with iron oxide. Substances obtained from paragraph 1 As for the spherical template, toluene, benzene, toluene dissolved in polystyrene and benzene, hexane, mineral oil, paraffin oil, etc. are used as it is or stabilized by adding a surfactant such as TWEEN and cetyl ammonium bromide. How to. The method of claim 1, wherein the linear template is animal hair, silk yarn, cotton yarn, PET yarn, polylactate yarn, or the like. A structure wherein iron obtained by the reduction reaction of the material obtained from claim 1 with carbon monoxide, hydrogen, and incomplete nitrogen oxide (NOx) is one of the components. A structure in which the iron oxide in the form of a sphere and a tube obtained by removing a template by heating a material obtained from paragraph 1 at 600 degrees Celsius or treating it with an acid or a base at 150 degrees Celsius or less. A steel structure in the form of spheres and tubes obtained by removing the template by heating the material obtained from paragraph 5 at 600 degrees Celsius or treating it with acid or base at 150 degrees Celsius or less.