Abstract:
PURPOSE: A manufacturing method of titanium embedded layered double hydroxide photo-catalysts is provided to simplify manufacturing processes using nickel or copper, and titanium as metals. CONSTITUTION: A manufacturing method of titanium embedded layered double hydroxide photo-catalysts for oxidizing water under a visible ray region includes the following: a metal precursor and a titanium metal precursor are added into an urea aqueous solution to be dissolved, and a solution is obtained; the solution is reacted to obtain a resultant product; the resultant product is centrifuged by a centrifuge, and a washing process and a drying process are further implemented.
Abstract:
PURPOSE: Light-color magnetic particles and a preparation method thereof are provided to effectively achieve light color of magnetic particles using a small amount of coating material by employing white melamine-formaldehyde resin as the coating material. CONSTITUTION: A method for preparing light-color magnetic particles is as follows. Melamine-formaldehyde resin, surfactant, and magnetic particles are mixed and stirred to coat the magnetic particles. The coated magnetic particles as are separated using a magnet. The melamine-formaldehyde resin is prepared by mixing melamine and formaldehyde aqueous solution and heating the mixture. The surfactant is one selected from the group consisting of pluronic F68, pluronic F127, pluronic P105, and pluronic L44. The magnetic particles are a mixture of one or more selected from the group consisting of iron, iron oxides, nickel, nickel oxide, cobalt, Ni-Co, Fe-Co, and chrome oxide.
Abstract:
PURPOSE: A method for manufacturing a hybrid of magnetite nanoparticles and carbonnitride nanotube is provided to obtain the hybrid which is uniformly doped on the surface of the carbonnitride nanotube while maintaining superparamagnetism of the magnetite nanoparticles. CONSTITUTION: A method for manufacturing a hybrid of magnetite nanoparticles and carbonnitride nanotube comprises the following steps: manufacturing the carbonnitride nanotube through a plasma chemical vapor deposition process; obtaining the mixture by adding steel acetylacetonate to the mixture after dissolving the carbonnitride nanotube in triethyleneglycol; and manufacturing the hybrid of the magnetite nanoparticle and the carbonnitride nanotube in which the magnetite nanoparticle is doped by cooling the mixture.
Abstract:
PURPOSE: A method for preparing melamine-formaldehyde spheres is provided to obtain a microporous melamine-formaldehyde sphere by only carbonization process and to reduce manufacturing cost and time. CONSTITUTION: A method for preparing melamine-formaldehyde spheres with nano-sized pores comprises the steps of: preparing a melamine-formaldehyde resin by mixing melamine and formaldehyde solutions and heating the mixture; obtaining solid powder by mixing and stirring the melamine-formaldehyde resin and a surfactant, followed by centrifuging the mixture; and obtaining the melamine-formaldehyde spheres by washing the solid powder with ethanol solution and drying the solid powder.
Abstract:
본 발명은 카본나노튜브의 수소저장용량을 향상시키기 위하여 카본나노튜브의 표면에 나노크기의 니켈(Ni)을 도핑하는 방법에 관한 것이다. 보다 상세히 설명하자면 증착을 통하여 제조한 시편 카본나노튜브의 금속촉매를 제거하기 위하여 황산용액에서 초음파처리한 후 여과하는 전처리 단계와, 카본나노튜브 시편을 액상용액에 함침한 후 건조된 시편을 환원처리하여 나노크기의 니켈을 카본나노튜브 표면에 도핑하는 단계로 구성된다. 본 발명의 수소저장용 나노크기의 Ni이 표면에 도핑된 카본나노튜브는 상온에서 수소의 흡·방출 용량이 기존의 카본나노튜브에 비해 매우 향상되어 상온근처에서 약 2.8wt%의 수소저장이 가능하다. 이는 실제 연료전지용 수소저장 재료로서 상용화가 기대된다.
Abstract:
본 발명은 흑연 구조의 탄소막을 반도체 광촉매 표면에 균일하게 코팅한 물질 및 이의 제조방법에 관한 것이다. 본 발명은 글루코스를 수열합성법과 열분해법(pyrolysis) 방법을 이용하여 반도체 표면에 두께 1 나노미터 이하의 흑연구조의 탄소막을 균일하게 형성시키면서, 탄소막의 지지체가 되는 반도체 광촉매 본연의 구조와 결정성을 그대로 유지하는 것을 특징으로 한다. 본 발명에 의해 개발된 탄소막-반도체 복합체 광촉매의 경우 반도체 광촉매에 발생되는 광전자들을 외부 계의 양성자에게 잘 전달할 수 있게 되므로 전자 정공 재결합을 효과적으로 억제할 수 있으며, 물을 분해하여 수소를 발생시키는 광촉매로서 매우 높을 활성을 가지고 있다.