Abstract:
The present invention relates to a polymer electrolyte membrane-electrode assembly with an enhanced hydrophobicity by maximizing the surface area by forming a nanopattern with a high aspect ratio on the catalytic carrier on the surface of a catalyst layer in order to supply ultra hydrophobicity to the surface of the catalyst layer, and by coating a hydrophobic thin film on the surface, and a manufacturing method thereof. The present invention provides a manufacturing method of a polymer electrolyte membrane-electrode assembly, which comprises a step of forming a nanopattern with a high aspect ratio by plasma-etching the catalyst carrier on the surface of a catalyst layer forming MEA; and a step of forming a hydrophobic thin film on the nanopattern formed on the catalyst carrier. [Reference numerals] (AA) Ultra hydrophobicity surface treatment (plasma etching + hydrophobic thin film coating); (BB) Catalyst layer; (CC,GG) Catalyst carrier; (DD) Catalyst; (EE,HH) Polymer electrolyte membrane; (FF) Hydrophobic thin film
Abstract:
본 발명은 본 발명은 선택적 친유 혹은 소수성을 갖는 고분자 방직 천(woven fabric) 표면의 제조방법과 이러한 표면을 이용하여 제조된 유-유 분리 및 유-수 분리 필터에 관한 것이다. 본 발명에 따르는 선택적 소유 혹은 소수 표면의 제조방법은, 마이크로 기공이 형성된 고분자 방직 천 표면에 건식 식각을 통하여 나노미터 크기를 갖는 기공을 형성하는 단계; 및 나노미터 크기의 기공 상에 선택적 소유 혹은 소수성 박막을 형성하는 단계를 포함한다. 기공의 크기나 박막의 재료 혹은 두께에 따라서, 소수/소유 특성을 조절할 수 있으며, 이러한 복합 기공을 가진 고분자 표면은 액체 혼합물, 특히 오일-오일 혼합물과 물-오일 혼합물의 선택적 분리가 가능한 자동차용 오일 필터, 공장 폐오일 처리, 해양 기름유출 사고 처리, 원유정제의 전처리 등의 다양한 분야에 사용될 수 있다.
Abstract:
A method for manufacturing a hydrophilic aluminum surface according to an embodiment of the present invention comprises an activating step of manufacturing doping-aluminum having a surface activated by doping the surface of the aluminum using reactive gas; and a structure forming step of forming a nanopattern including a needle, plate, or dot-shaped nanoprotrusion structure on the surface of the aluminum by oxidizing the doping-aluminum. The method can artificially make the hydrophilic or superhydrophilic aluminum from hydrophobic aluminum, and can provide the aluminum surface body in which an aging effect hardly shows and hydrophilic aluminum surface characteristics are maintained for a long time.
Abstract:
PURPOSE: A superhydrophobic surface and steel thereof and the fabrication method thereof are provided to diminish wettability of surface and to minimize contact angle hysteresis by coating a material of low surface energy. CONSTITUTION: A superhydrophobic surface includes a hydrophobic film and a steel surface. The nano/micro pattern is formed in the steel surface. The hydrophobic thin film is formed on the steel surface. The contact angle of the superhydrophobic surface is over 150. The contact angle hysteresis is less than 5.