Abstract:
본 발명은 금속 나노 입자의 제조 방법에 관한 것으로서, (a) 알코올에 금속 전구체를 용해시킨 금속 전구체 용액을 준비하는 단계; (b) 상기 금속 전구체 용액을 초임계 조건의 반응기에 연속적으로 도입하여 금속 나노 입자를 생성시키는 단계; (c) 상기 단계 (b)에서 얻어지는 용액을 냉각시키는 단계; 및 (d) 상기 단계 (c)에서 얻어지는 용액으로부터 금속 나노 입자를 분리 및 회수하는 단계;를 포함하는 금속 나노 입자의 연속 제조 방법과, 이에 의하여 제조되는 금속 나노 입자에 관한 것이다. 금속 나노 입자, 알코올 용매, 초임계 조건, 연속공정
Abstract:
본 발명은 셀룰로오즈 포스파이트 화합물의 제조방법에 관한 것으로, 더욱 상세하게는 셀룰로오즈를 아민계 양이온과 포스파이트계 음이온으로 이루어진 이온성 액체를 사용한 포스포릴화 반응을 통해 제조하는 셀룰로오즈 포스파이트 화합물의 제조방법에 관한 것이다. 본 발명의 제조방법으로 제조된 셀룰로오즈 포스파이트 화합물은 물에 대한 용해도가 우수하여 농도 조절제, 의약품, 생체용 멤브레인 등의 소재로서 이용가치가 매우 크다.
Abstract:
PURPOSE: A zinc-air fuel cell is provided to minimize the distance where hydroxide ions generated in a positive electrode collector moves to a negative electrode collector and to improve the performance of the fuel cell by accelerating a speed losing electrons from zinc. CONSTITUTION: A zinc-air fuel cell comprises: an integrated separator-electrode assembly including a metal porous plate as a positive electrode collector, carbon paper on which a catalyst is coated, separation film, and metal porous plate as a negative electrode collector; and an inclined non-conductive supporter. The metal porous plates as the positive and negative electrode collectors are stainless steel, nickel, iron, copper, gold or platinum.
Abstract:
PURPOSE: A method for quickly preparing metal nanoparticles of high yield using supercritical fluid without toxic reductant and storng acid is provided. CONSTITUTION: A method for preparing metal nanoparticles comprises: a step of dissolving metal precursors in alcohol to obtain a metal precursor solution; a step of introducing the metal precursor solution to a reactor to generate metal nanoparticles under supercritical condition; a step of cooling the metal nanoparticles; and a step of isolating and collecting metal particles from the cooled solution. The reaction temperature is 200-600°C. The metal nanoparticle is selected from a group consisting of Cu, Ni, Ag, Au, Ru, Rh, Pd and Pt.
Abstract:
PURPOSE: CIGS(CuInxGa1-xSe2) particles and a method for preparing the same are provided to prepare CIGS particles at relatively low temperature by using an alcohol mixed solvent with high volatility. CONSTITUTION: A method for preparing CIGS particles comprises steps of: preparing a CIG precursor compound(101) or oxide from the precursors of Cu, In, and Ga(100), dissolving the CIG precursor compound or oxide and Se precursor in a mixed organic solvent, synthesizing CIGS particles by making the solution react at a temperature lower than to the boiling temperature of the organic solvent and higher than the boiling temperature of alcohol, separating the precipitate from the solution and washing and drying it, and obtaining nano-sized CIGS particles through the centrifugal separation, washing and drying of the remaining solution.
Abstract:
PURPOSE: A process for preparing hydrofluoroethers is provided to prepare hydrofluoroethers at a high yield while dramatically reducing a double bond product as a by-product by using alkali metal phosphate and halide-based amine salt. CONSTITUTION: A process for preparing hydrofluoroethers is prepared by reacting an alcohol compound and a fluorine-containing olefin compound. The reaction is performed in a condition that alkali metal phosphate and halide-based amine salt are present. The alcohol compound is selected from C1-8 alcohol, perfluorinated phenol containing 1-5 fluorine atoms, and C1-8 fluorinated alcohol containing 1-15 fluorine atoms. The fluorine-containing olefin is selected from C2-4 olefin compound containing 1-8 fluorine atoms.
Abstract:
A preparation method of 5-vinyl-2-norbornene is provided to improve a conversion ratio of cyclo pentadiene and to suppress by-products by using an aprotic polar compound. A preparation method of 5-vinyl-2-norbornene through Diels-alder reaction of cyclopentadiene and 1,3-butadiene uses a reaction catalyst and an aprotic polar compound as solvent. The aprotic polar compound is single or a mixture of at least two selected from dimethylformamide, monomethylformamide, monomethylacetamide, dimethylacetamide, dimethylsulfoxide and methylpyrrolidone.
Abstract:
양기능성수전해용전극촉매및 그제조방법, 그리고, 상기전극촉매를포함하는수전해전지가제공된다. 상기수전해용전극촉매는산소결핍도가크면서나노다공성구조를가지고, 산소발생성능및 수소발생성능이높아수전해시스템에활용될수 있다. 상기수전해용전극촉매는금속양이온및 할로겐음이온을포함하는용액을이용한전기화학적처리를통하여간단하게대면적으로제조할수 있다.