Abstract:
PURPOSE: A porosity nano silicon carbide and a manufacturing method thereof are provided to simplify processing conditions and prevent cracks. CONSTITUTION: A porosity nano silicon carbide manufacturing method includes next steps. A polymer precursor and silicone compound are mixed with solvent. The compound which is obtained in the stage is electro-spined in a sphere or fiber form. A heat-treatment process is executed for the electrospinning result. The polymer precursor is selected among petroleum pitch, coal type pitch, polyimide, polybenzimidazole, poly acrylonitrile, polyaramide, polyaniline, mesophase pitch, furfuryl alcohol, phenol, cellulose, sucrose, polyvinylchloride and their mixture.
Abstract:
PURPOSE: A method for manufacturing visible ray active anatase-brookite type titanium dioxide photocatalyst is provided to secure the anatase-brookite hybrid crystalline structure of the photocatalyst and to lower the band-gap energy of titanium dioxide. CONSTITUTION: A method for manufacturing visible ray active anatase-brookite type titanium dioxide photocatalyst includes the following: a titanium dioxide solution is prepared by mixing a titanium dioxide precursor with distilled water and a co-solvent; an acid catalyst is added to the titanium dioxide solution; and the mixture is dried and thermally treated and fluorine-based treated. The content of the distilled water is 1 to 100 parts by weight based on 100 parts by weight of the titanium dioxide precursor.
Abstract:
PURPOSE: A method for manufacturing an electromagnetic wave shielding agent and an absorbent is provided to obtain porous nano silicon carbide with excellent oxidation resistance at high temperature and properties. CONSTITUTION: A method for manufacturing an electromagnetic wave shielding agent and an absorbent comprises the steps of: mixing polymer precursors and silicon compounds, or polymer precursors, silicon compounds and conductive carbon material, with a solvent; electrospinning the mixture; heat-treating the electrospinned product to prepare porous nano silicon carbide with excellent oxidation resistance at high temperature; and preparing an electromagnetic wave shielding agent and an absorbent using the porous nano silicon carbide.
Abstract:
고온에서 내산화성을 갖는 다공성 나노 탄화규소 및 그 제조방법이 개시된다. 본 발명에 따른 내산화성을 갖는 다공성 나노 탄화규소의 제조방법은, (1) 폴리머 전구체와 실리콘다이옥사이드를 용매와 혼합하는 단계; (2) 상기 '단계 (1)'의 과정을 통하여 얻어진 혼합물을 구형상 또는 섬유형상으로 전기방사하는 단계; 및 (3) 상기 '단계 (2)'의 과정을 통하여 얻어진 전기방사 결과물에 열처리를 하는 단계를 포함하여 이루어진다. 다공성, 탄화규소, 전기방사, 내산화성
Abstract:
PURPOSE: A method for manufacturing an electromagnetic wave shielding agent and an absorbent is provided to obtain porous nano silicon carbide with excellent oxidation resistance at high temperature and properties. CONSTITUTION: A method for manufacturing an electromagnetic wave shielding agent and an absorbent comprises the steps of: mixing polymer precursors and silicon compounds, or polymer precursors, silicon compounds and conductive carbon material, with a solvent; electrospinning the mixture; heat-treating the electrospinned product to prepare porous nano silicon carbide with excellent oxidation resistance at high temperature; and preparing an electromagnetic wave shielding agent and an absorbent using the porous nano silicon carbide.
Abstract:
PURPOSE: A producing method of an anatase titanium oxide optical catalyst, and the anatase titanium oxide optical catalyst are provided to activate an anatase titanium oxide by weak visible rays with the excellent light resolution ability. CONSTITUTION: A producing method of an anatase titanium oxide optical catalyst responsive to visible rays comprises the following steps: mixing an anatase titanium oxide with a monosaccharide material; adding a dehydrating agent into the mixture; dehydrating the mixture by heating; filtering the obtained product with water for removing foreign materials; drying the obtained product; and processing the product with fluorine.