Abstract: The present invention features a plastic with a nano-embossing pattern formed on the surface of polypropylene (PP) by preferably irradiating an argon ion beam, and a method for preparing the same. In preferred embodiments, the present invention also provides a method for preparing a plastic with a nano-embossing pattern formed on the surface thereof.

Abstract: The present invention provides a plastic with improved gloss properties and a surface treatment method for plastic, which forms a nanopattern and a hardened layer on the surface of a polymer material by irradiating an argon ion beam onto the surface to change the refractive index, thus changing the gloss of the polymer variously using only the polymer/plastic material.

Abstract: The present invention features in preferred aspects a method of fabricating nano composite powder consisting of carbon nanotubes and metal matrix powder is disclosed. The method includes a low-speed milling process of milling and mixing the carbon nanotubes and the metal matrix powder, and a high-speed milling process of milling the carbon nanotubes and the metal matrix powder which are homogenously mixed in the low-speed milling process to homogenously disperse the carbon nanotubes in the metal matrix powder. In certain preferred aspects, the method can prevent damage of the carbon nanotube and can homogenously disperse the carbon nanotubes in the metal matrix.

Abstract: The present invention provides a novel piperazinium trifluoroacetate compound prepared by reacting piperazine with trifluoroacetic acid and a carbon dioxide absorbent prepared by dissolving the compound in an ionic liquid or organic solvent. According to the present invention, the carbon dioxide absorbent has excellent carbon dioxide absorption capacity and low solvent loss, and the energy consumption required for the carbon dioxide absorption and desorption is significantly reduced.

Abstract: The present invention relates to ceramic-NiO composite powders which can be used to form ceramic-NiO composite body anodes. These anodes possess an interpenetrating network structure and can be used in solid oxide fuel cell (SOFC) by The present invention also describes methods of preparing these powder, anodes and fuel cells.

Abstract: A composite gasket for fuel cell stack comprises two rows of beads and a support which can improve mountability and sealing property and reduce the assembly pressure by using materials having low hardness with reduced volume. This invention also relates to a structure for the assembly of the composite gasket.

Abstract: A rotary pump is provided in which a drive motor is provided such that an output shaft of the drive motor is placed at an offset position, so that a rotational speed of the pump can be changed to a high or low speed. Furthermore, rigid balls or needle roller bearings are used in each rotor unit such that each eccentric rotary body is in rolling contact with a circumferential inner surface of each cylindrical housing, thus reducing friction between them, thereby ensuring smooth rotation of the rotor units. In addition, a space, which is defined between each cylindrical housing and each eccentric rotary body, prevents a cross-plate from being damaged due to torsional stress and tensile force, thereby ensuring superior durability of the pump.

Abstract: The present invention relates to ceramic-NiO composite powders which can be used to form ceramic-NiO composite body anodes. These anodes possess an interpenetrating network structure and can be used in solid oxide fuel cell (SOFC) by The present invention also descibes methods of preparing these powder, anodes and fuel cells.

Abstract: A manufacturing method of Membrane-Electrode-Gasket Assemblies (MEGAs) used for polymer electrolyte fuel cells (PEFCs) is described wherein a polymer electrolyte membrane is formed directly on a electrode. A typical PEFC is constructed by assembling membrane-electrode assembly (MEA), gaskets, and separators. According to the invented method, PEFC is fabricated by assembling separators and MEGA, into which MEA and a gasket are integrated. Compared to the conventional MEA-gasket assemblies, MEGAs are easy to handle and can be mass-produced via a manufacturing process in a series. Moreover, employing MEGAs improves PEFC performance since the membrane thickness of MEGAs is lower than that of the conventional MEA-gasket assemblies.

Abstract: A method for operating a polymer electrolyte membrane fuel cell at temperatures below the freezing point of water and an apparatus thereof are provided to prevent damage and performance degradation of the membrane-electrode assemblies. Non-humidified gas flows for several seconds before temperature of the polymer electrolyte membrane fuel cell falls below the freezing temperature of water when operation of the polymer electrolyte membrane fuel cell stops. Simultaneously, anode of the polymer electrolyte membrane fuel cell is filled with a solution having a low freezing point to prevent the temperature of a polymer electrolyte membrane fuel cell falling below the freezing point of water due to the lower ambient temperature in the winter. When the polymer electrolyte membrane fuel cell is restarted, the cell performance is not degraded reflecting that the present invention stably preserves the fuel cell.

Abstract: The present invention relates to a humidifier for humidifying reactant gases for a polymer electrolyte fuel cell system, and more particularly, to the humidifier for humidifying reactant gas which adjusts an amount of water for humidification while reducing electric power consumption and size, thereby maintaining an optimal temperature and humidity of the reactant gas supplied to a polymer electrolyte fuel cell. The humidifier for humidifying reactant gases comprises a humidification vessel connected to a reactant gas inlet pipe for supplying reactant gases thereto, a water inlet pipe for supplying water thereto, and a reactant gas supplying pipe for supplying the humidified reactant gas to the fuel cell are connected, respectively, and a sprayer which is installed in the humidification vessel and finely sprays the reactant gases and water which are supplied to the humidification vessel.

Abstract: A fuel cell monitoring system whereby the voltages of each unit cell in a fuel cell are compared with a reference voltage without converting the voltages of the unit cell from analogue to digital, and whether or not each unit cell is working normally is set as O or 1, thereby greatly reducing the amount of information to be processed and simplifying a monitoring circuit.

Abstract: A method for operating a polymer electrolyte membrane fuel cell at temperatures below the freezing point of water and an apparatus thereof are provided to prevent damage and performance degradation of the membrane-electrode assemblies. Non-humidified gas flows for several seconds before temperature of the polymer electrolyte membrane fuel cell falls below the freezing temperature of water when operation of the polymer electrolyte membrane fuel cell stops. Simultaneously, anode of the polymer electrolyte membrane fuel cell is filled with a solution having a low freezing point to prevent the temperature of a polymer electrolyte membrane fuel cell falling below the freezing point of water due to the lower ambient temperature in the winter. When the polymer electrolyte membrane fuel cell is restarted, the cell performance is not degraded reflecting that the present invention stably preserves the fuel cell.

Abstract: The present invention relates to a humidifier for humidifying reactant gases for a polymer electrolyte fuel cell system, and more particularly, to the humidifier for humidifying reactant gas which is capable of adjusting the amount of water for humidification while reducing the electric power consumption and its size, thereby maintaining an optimal temperature and humidity of the reactant gas supplied to a polymer electrolyte fuel cell. The humidifier for humidifying reactant gases comprises a humidification vessel which a reactant gas inlet pipe for supplying reactant gases thereto, a water inlet pipe for supplying water thereto, and a reactant gas supplying pipe for supplying the humidified reactant gas to the fuel cell are connected, respectively, and a spray which is installed in the humidification vessel and finely sprays the reactant gases and water which are supplied to the humidification vessel.