Abstract: Disclosed is: a single crystalline silicon carbide nanofiber having improved thermal and mechanical stability as well as a large specific surface area which is applicable to a system for purifying exhaust gas, silicon carbide fiber filter, diesel particulate filter having a high temperature stability and may be used in the form of nanostructures such as nanorods and nanoparticles.

Abstract: There is provided a metal oxide having a continuous nano-fiber network structure as a negative active material for a secondary battery. A method for fabricating such negative active material for a secondary battery comprises spinning a mixed solution of a metal oxide precursor and a polymer onto a collector to form composite fibers mixed with the metal oxide precursor and the polymer, thermally compressing or thermally pressurizing the composite fibers, and thermally treating the thermally compressed or thermally pressurized composite fibers to remove the polymer from the composite fiber.

Abstract: A mask assembly includes a frame including an opening part; and unit masks that are disposed on the opening part and having both ends of each of the unit masks supported by the frame in the state where tensile force is applied in one direction, each of the unit masks including: pattern opening parts disposed in the one direction; and a first groove disposed adjacent to the pattern opening parts and between the pattern opening parts and an edge of the unit mask, and formed to be depressed from a surface of the unit mask.

Abstract: A mask frame assembly for thin film deposition includes a frame including an opening portion, and a plurality of unit mask strips that are fixed to the frame after a tensile force is applied to both of end portions of the unit mask strips in a lengthwise direction of the unit mask strips. Each of the plurality of unit mask strips includes a plurality of unit masking pattern portions each including a plurality of opening patterns. Before the tensile force is applied to both of the end portions of the unit mask strips in the lengthwise direction and the unit mask strips are fixed to the frame, a width of each of the unit masking pattern portions in a widthwise direction perpendicular to the lengthwise direction increases as a function of a closeness of a portion of the unit masking pattern portion where the width is measured to a central portion of each of the unit masking pattern portions.

Abstract: An oxygen sensor using the principle of surface plasmon resonance, capable of measuring an oxygen concentration in a measurement chamber by detecting a change in resonance angle or refractive index using field enhancement effects, is provided. An oxygen transmission rate measurement system including the oxygen sensor is also provided. In this invention, only a change in voltage is measured at a fixed angle, thus achieving rapid measurement, and also, a single wavelength light source is used, thus reducing the size of the oxygen sensor and oxygen transmission rate measurement system.

Abstract: A deposition mask for manufacturing an organic light emitting display (OLED) using the same are provided. The deposition mask is intended for preventing an organic film from being damaged due to touching of a blocked-off portion of the mask to an emission layer (EML), or chemical transition from being generated at the organic film. For that purpose, the deposition mask stuck to a substrate of the OLED to deposit an organic EML includes an opening and an indentation. The opening is opened so as to deposit the organic EML. The indentation is indented a predetermined depth from a plane facing the substrate.

Abstract: The present invention relates to a porous conducting metal oxide electrode prepared by depositing a porous conducting metal oxide film comprising a conducting metal oxide film layer having a network structure of nanofibers, comprising nanograins or nanoparticles, on at least one surface of a current collector, and a conducting metal oxide coating layer on the network layer of the porous conducting metal oxide through the constant current method or the cyclic voltammetric method, and a high-speed charge/discharge and ultrahigh-capacity supercapacitor using the porous conducting a metal oxide electrode.

Abstract: A method for fabricating an ultra-sensitive metal oxide gas sensor is disclosed, which comprises the steps of spinning a mixture solution including a metal oxide precursor and a polymer onto a sensor electrode to form a metal oxide precursor-polymer composite fiber; thermally compressing or thermally pressurizing the composite fiber; and thermally treating the thermally compressed or thermally pressurized composite fiber to remove the polymer from the composite fiber. Since the gas sensor includes a macro pore between nanofibers and a meso pore between nano-rods and/or nano-grains, gas diffusion and surface area can be maximized. Also, the ultra-sensitive sensor having high stability in view of mechanical, thermal, and electrical aspects can be obtained through rapid increase of adhesion between the metal oxide thin layer and the sensor electrode.

Abstract: A deposition mask and a method for manufacturing an organic light emitting display (OLED) using the same are provided. The deposition mask is intended for preventing an organic film from being damaged due to touching of a blocked-off portion of the mask to an emission layer (EML), or chemical transition from being generated at the organic film. For that purpose, the deposition mask stuck to a substrate of the OLED to deposit an organic EML includes an opening and an indentation. The opening is opened so as to deposit the organic EML. The indentation is indented a predetermined depth from a plane facing the substrate.

Abstract: There is provided a metal oxide having a continuous nano-fiber network structure as a negative active material for a secondary battery. A method for fabricating such negative active material for a secondary battery comprises spinning a mixed solution of a metal oxide precursor and a polymer onto a collector to form composite fibers mixed with the metal oxide precursor and the polymer, thermally compressing or thermally pressurizing the composite fibers, and thermally treating the thermally compressed or thermally pressurized composite fibers to remove the polymer from the composite fiber.

Abstract: There is provided a high efficient gas separation membrane of two or more layers, which comprises a separating layer of 3-dimensional nanostructure and a supporting layer, wherein the 3-dimensional nanostructure can maximize a surface area per unit permeation area.

Abstract: A method for fabricating an ultra-sensitive metal oxide gas sensor is disclosed, which comprises the steps of spinning a mixture solution including a metal oxide precursor and a polymer onto a sensor electrode to form a metal oxide precursor-polymer composite fiber; thermally compressing or thermally pressurizing the composite fiber; and thermally treating the thermally compressed or thermally pressurized composite fiber to remove the polymer from the composite fiber. Since the gas sensor includes a macro pore between nanofibers and a meso pore between nano-rods and/or nano-grains, gas diffusion and surface area can be maximized. Also, the ultra-sensitive sensor having high stability in view of mechanical, thermal, and electrical aspects can be obtained through rapid increase of adhesion between the metal oxide thin layer and the sensor electrode.

Abstract: The present invention provides a composite dielectric film including a polymer and a ceramic with pyrochlore structure and a method of fabricating the same. The composite dielectric film includes a polymer matrix and a ceramic of a pyrochlore structure filled in such polymer matrix.

Abstract: A deposition mask and a method for manufacturing an organic light emitting display (OLED) using the same are provided. The deposition mask is intended for preventing an organic film from being damaged due to touching of a blocked-off portion of the mask to an emission layer (EML), or chemical transition from being generated at the organic film. For that purpose, the deposition mask stuck to a substrate of the OLED to deposit an organic EML includes an opening and an indentation. The opening is opened so as to deposit the organic EML. The indentation is indented a predetermined depth from a plane facing the substrate.

Abstract: There is provided a high efficient gas separation membrane of two or more layers, which comprises a separating layer of 3-dimensional nanostructure and a supporting layer, wherein the 3-dimensional nanostructure can maximize a surface area per unit permeation area.

Abstract: A fluorene-based polymer of the following Formula (I) and electroluminescent devices using the same. wherein, R1, R2, R3 and R4 are same or different and represent hydrogen, aliphatic or alicyclic alkyl or alkoxy groups containing 1 to 22 carbon atoms, aryl or aryloxy group containing 6 to 18 carbon atoms, cyano, cyanoethyl, or an alkyl or aryl derivative of silicon, tin or germanium; X represents diacetylene, diethynyl aryl, divinylaryl group or a single bond; and n is an integer equal to or greater than 1.

Abstract: A fluorene-based polymer of the following Formula (I) and electroluminescent devices using the same.

Abstract: A diacetylene-based polymer of the following formula (I): wherein, Ar represents a light emitting group. The present invention also provides an electroluminescence device having a structure of anode/luminescent layer/cathode added with a transfer layer and/or a reflection layer, if necessary, in which the luminescent layer is made of the diacetylene-based polymer containing the light emitting group. The polymer of the present invention can be easily blended with a variety of macromolecules for general use.

Abstract: The present invention provides a process for preparing polyethylene naphthalate polymers comprising: esterifying a slurry comprising NDCA or a dicarboxylic acid containing NDCA or derivatives thereof, and ethylene glycol or a glycol containing ethylene glycol or derivatives thereof to produce esterification compounds comprising bis (beta-hydroxyethyl) naphthalate or low molecular weight polymers thereof, wherein one or more primary alcohol is added to the slurry; and polycondensing the above resultant esterification compounds to produce polyethylene naphthalate polymers. The process of the present invention allows for the preparation of a slurry more easily and to maximize the manufacturing efficiency.

Abstract: A process for preparing polyethylene naphthalate polymer by using a composite catalyst. The process comprises the steps of esterifying a dicarboxylic acid containing 2,6-NDCA, a dicarboxylic ester containing 2,6-NDC or derivatives thereof, with ethylene glycol or a glycol containing ethylene glycol to produce esterification polymers containing bis(beta-hydroxyethyl)naphthalate; continuously polycondensing the obtained esterification polymers to prepare a polymers of polyethylene naphthalate; and wherein the process includes using a composite polymerization catalyst, said composite polymerization catalyst comprising a titanium compound, a phosphorous compound and optionally an antimony compound. The process can considerably reduce both the esterification time and the polycondensation time and provides a good color and excellent physical characteristics.