Abstract: The present invention relates to a method of preparing a material having a superhydrophobic region and a hydrophobic region, and more particularly to a method of preparing a material having a superhydrophobic region and a hydrophobic region by preparing a superhydrophobic surface body and hydrolyzing one surface of the prepared superhydrophobic surface body using a strong base. The preparation method according to the invention is simpler than conventional preparation methods and is capable of preparing a material having opposite surface characteristics at low costs.

Abstract: Disclosed herein are a printed circuit board and a method for manufacturing the same. The printed circuit board including an adhesive promoter interposed between an insulating layer and a circuit layer on a substrate in order to improve adhesion therebetween; and a first metal layer formed between the adhesive promoter and the circuit layer has high adhesion between an insulating layer such as a resin and a circuit while having low roughness by including a polymer adhesive promoter, easily forms a fine circuit and has low signal transmission loss due to low roughness, and has high reliability due to the high adhesion.

Abstract: The present invention relates to a method for concentrating law titer fermentation broth, and more particularly to a method for concentrating a fermentation broth using forward osmosis. The method comprises: introducing the fermentation broth and an osmolyte into a feed chamber and a draw chamber, respectively, which are included in a concentration system and are divided from each other by a forward osmosis membrane, and subjecting the introduced fermentation broth to forward osmosis, thereby concentrating the fermentation broth in the feed chamber. The method can maximize the concentration of the low titer fermentation broth while minimizing energy consumption and operating cost, and thus can contribute to the industrialization of new technology.

Abstract: One aspect of the invention relates to a linker-free, one-step method of grafting polymer films onto organic substrates, and the films obtained by such a method. In certain embodiments, the grafted polymer films are conductive. In certain embodiments, said grafting method utilizes the ability for Friedel-Crafts catalyst to form radical cations from organic substrates. In one embodiment, the method provides poly-3,4-ethylenedioxythiophene (PEDOT) thin films grafted to organic substrates. In other embodiments, the method is applicable to the polymerization of other monomers to yield conducting polymers, such as polyanilines, polypyrroles, polyfurans, polythiophenes and their derivatives. Remarkably, the polymer films grafted by the inventive methods show enormous increases in adhesion strength. Further, in certain embodiments, polymer patterns were easily obtained using the inventive methods and soft lithography techniques.

Abstract: Disclosed is a novel group of compounds having a general structure of anthracene body substituted with at least one thiophenyl group, which can be further substituted with various substituent groups. These new compounds are generally compatible with organic electroluminescence. Also disclosed are organic electroluminescent devices and method of making the same. The organic electroluminescent devices include at least one of the compounds in various layers thereof. Organic electroluminescent devices employing the new compounds in their light-emitting layers show outstanding stability.

Abstract: Disclosed is a novel group of compounds having a general structure of anthracene body substituted with at least one thiophenyl group, which can be further substituted with various substituent groups. These new compounds are generally compatible with organic electroluminescence. Also disclosed are organic electroluminescent devices and method of making the same. The organic electroluminescent devices include at least one of the compounds in various layers thereof. Organic electroluminescent devices employing the new compounds in their light-emitting layers show outstanding stability.

Abstract: Disclosed is a novel group of compounds having a general structure of anthracene body substituted with at least one thiophenyl group, which can be further substituted with various substituent groups. These new compounds are generally compatible with organic electroluminescence. Also disclosed are organic electroluminescent devices and method of making the same. The organic electroluminescent devices include at least one of the compounds in various layers thereof. Organic electroluminescent devices employing the new compounds in their light-emitting layers show outstanding stability.

Abstract: An organic electro-luminescence (EL) device includes a first electrode formed on a substrate and a second electrode formed to overlap with the first electrode. An organic EL layer is located between the first and second electrodes. A dielectric layer is formed between the second electrode and the EL layer. The dielectric layer contains antioxidative material, formed by a mixture of approximately 50˜75% of an organic material and approximately 25˜50% of an metallic powder. The organic electro-luminescence device demonstrates an increased picture quality and increased luminous efficiency.

Abstract: Disclosed are double-spiro organic compounds and an organic electroluminescence (EL) device using the same. The double-spiro organic compounds are configured to have at least three planar and substantially linear moieties, such that one planar moiety is located between two neighboring planar moieties and that the intervening planar moiety shares an atom with each of the two neighboring planar moieties. The double-spiro compounds generally have high melting point above about 300 degree C. and low crystallinity, which provide thermal stability to the organic EL devices. These organic compounds have good sublimability. They also have light-emitting, hole-injecting, hole-transporting, electron injection, electron-transporting properties and characteristics, which are favorable in the organic EL devices.

Abstract: Disclosed are double-spiro organic compounds and an organic electroluminescence (EL) device using the same. The double-spiro organic compounds are configured to have at least three planar and substantially linear moieties, such that one planar moiety is located between two neighboring planar moieties and that the intervening planar moiety shares an atom with each of the two neighboring planar moieties. The double-spiro compounds generally have high melting point above about 300 degree C. and low crystallinity, which provide thermal stability to the organic EL devices. These organic compounds have good sublimability. They also have light-emitting, hole-injecting, hole-transporting, electron injection, electron-transporting properties and characteristics, which are favorable in the organic EL devices.

Abstract: Novel materials for electron injection/transportation and emitting layers can greatly improve the stability of an organic electroluminescent display. Electroluminescent displays incorporating these materials produce blue light at low voltage levels. These novel organic materials include compounds in which 1 to 2 imidazole functional groups are introduced in the 2 or 2,6-site of 9,10 substituted anthracene. An organic electroluminescent display with an organic compound layer of these materials has high efficiency, thermal stability, operationally stability and maintains driving voltage before and after operation.

Abstract: The present invention relates to a high crystalline polypropylene microporous membrane and a preparation method of the same, and it provides a preparation method of a polypropylene microporous membrane comprising the steps of preparing a precursor film using high crystalline polypropylene having a crystallinity of 50% or more and a very high isotacticity, annealing, stretching at a low temperature, stretching at a high temperature, and heat setting, and a polypropylene microporous membrane having superior permeability and mechanical properties prepared by the preparation method.

Abstract: Disclosed are double-spiro organic compounds for use in the organic electroluminescence. The double-spiro organic compounds have a configuration or structure including at least three planar moieties, which are substantially linearly configured such that one planar moiety is interveningly located between two neighboring planar moieties and that the intervening planar moiety shares an atom with each of the two neighboring planar moieties. The intervening planar moiety is substantially perpendicular to the two neighboring planar moieties. The two atoms shared with the neighboring planar moieties are preferably most apart from each other in the intervening planar moieties. The double-spiro compounds generally have high melting point above about 300° C. and low crystallinity, which provide thermal stability to the organic EL devices. Also, the double-spiro organic compounds have good sublimability, which provide applicability to the physical vapor deposition.

Abstract: Disclosed is a novel group of compounds having a general structure of anthracene body substituted with at least one thiophenyl group, which can be further substituted with various substituent groups. These new compounds are generally compatible with organic electroluminescence. Also disclosed are organic electroluminescent devices and method of making the same. The organic electroluminescent devices include at least one of the compounds in various layers thereof. Organic electroluminescent devices employing the new compounds in their light-emitting layers show outstanding stability.

Abstract: Disclosed are double-spiro organic compounds for use in the organic electroluminescence. The double-spiro organic compounds have a configuration or structure including at least three planar moieties, which are substantially linearly configured such that one planar moiety is interveningly located between two neighboring planar moieties and that the intervening planar moiety shares an atom with each of the two neighboring planar moieties. The intervening planar moiety is substantially perpendicular to the two neighboring planar moieties. The two atoms shared with the neighboring planar moieties are preferably most apart from each other in the intervening planar moieties. The double-spiro compounds generally have high melting point above about 300° C. and low crystallinity, which provide thermal stability to the organic EL devices. Also, the double-spiro organic compounds have good sublimability, which provide applicability to the physical vapor deposition.

Abstract: Novel materials for electron injection/transportation and emitting layers can greatly improve the stability of an organic electroluminescent display. Electroluminescent displays incorporating these materials produce blue light at low voltage levels. These novel organic materials include compounds in which 1 to 2 imidazole functional groups are introduced in the 2 or 2,6-site of 9,10 substituted anthracene. An organic electroluminescent display with an organic compound layer of these materials has high efficiency, thermal stability, operationally stability and maintains driving voltage before and after operation.

Abstract: The present invention relates to a high crystalline polypropylene microporous membrane and a preparation method of the same, and it provides a preparation method of a polypropylene microporous membrane comprising the steps of preparing a precursor film using high crystalline polypropylene having a crystallinity of 50% or more and a very high isotacticity, annealing, stretching at a low temperature, stretching at a high temperature, and heat setting, and a polypropylene microporous membrane having superior permeability and mechanical properties prepared by the preparation method.