Korea Institute of Science and Technology

Other

Bok Ryul Yoo

Joon Soo Han

Il N Jung

Bong Won Lee

Weon Cheol Lim

Seung H Yeon

Seung Yong Lee

So Hye Cho

Jong Ku Park

Dong Euy Jung

Yeon Seok Cho

Dong Won Lee

Seung-Hyun Kang

Il Ki Han

Hyungduk Ko

Daejin Kim

Mi-Yeon Suk

Joon-Suh Park

Eun J Cho

Mu Yeol Kim

Joo-Hyun Cho

Yong Su Jung

Jang Hyun Yoo

Janghyun Yoo

Mi Suk Kim

Joo-hyun Cho

Seung Ho Yoen

Yoo Kyoung Jeon

Sam Young Ahn

Doo Hyun Ko

Mi-Kyoung Hong

Weon-Cheol Lim

Dong Eui Jung

A method for producing tetraalkoxysilane includes reacting a compound represented by Chemical Formula 1 below with an alkali metal at a molar ratio ranging from 1.0:1.0 to 1.0:1.1 and in the absence of a solvent to produce a basic catalyst represented by Chemical Formula 2 below; and mixing the basic catalyst represented by Chemical Formula 2, silicon metal, and an alcohol represented by Chemical Formula 3 below to produce tetraalkoxysilane: Chemical Formula 1O(CHRCHO)&#x2014;H, Chemical Formula 2O(CHRCHO)-, and Chemical Formula 3OH, where M is alkali metal, Rrepresents a C1-C5 linear hydrocarbon group or a C3-C5 branched hydrocarbon group, Rrepresents H or a C1-C3 linear hydrocarbon group, Rrepresents a C1-C2 alkyl group, and n is an integer of 2-3. Thus, it is possible to increase the proportion of the catalyst in the process, and to minimize production of impurities caused by solvent decomposition.

Method for continuous production of tetraalkoxysilane

The present invention relates to a solar cell having a wavelength converting layer formed of a polysilazane and a manufacturing method thereof to allow for low temperature sintering, to protect a wavelength converter from oxidation, degradation, and whitening, and thereby improve efficiency of the solar cell. The present invention provides for the solar cell including the wavelength converting layer which is formed by applying a coating solution containing a solvent, a polysilazane, and a wavelength converter onto a cell and an outer surface or inside of the cell, and then curing, and a manufacturing method of.

Solar cell having wavelength converting layer and manufacturing method thereof

There is provided a phosphor powder which includes a wavelength converting material and a silica-based inorganic substance surrounding the wavelength converting material and represented by the following Formula 1, wherein a content of a hydrosilyl group (Si&#x2014;H) is greater than or equal to 10 ppm by weight, based on the total weight of the silica-based inorganic substance: 

Phosphor powder and method of manufacturing the same

The present invention relates to a method for preparing a hydrosilane using heteroatom-containing activated carbon, more particularly to a method for economically preparing a high-purity hydrosilane by redistribution of a chlorosilane using a heteroatom-containing activated carbon catalyst.

Method for preparing a hydrosilane using hetero atom containing activated carbon

Disclosed are a functional reinforcing filler including inorganic particles surface-modified with an alkenylsilanol obtained by hydrolyzing an alkenylalkoxysilane compound, and a method for preparing the same. Since the disclosed functional reinforcing filler has a functional group having a double bond, it has good reactivity for styrene-butadiene rubber and sulfur. Thus, when used as a functional reinforcing filler in the manufacture of rubber, it allows improvement of physical properties through adjustment of the addition amount of sulfur without additional use of the coupling agent. In addition, because of superior hydrolysis reactivity, the problem of alcohol can be solved and a rubber mixture with long scorch time can be prepared. In particular, when the functional reinforcing filler of the present invention is used in the manufacture of tires, improvement in modulus, tensile strength, rotational resistance and wet traction performance can be expected.

Functional reinforcing fillers modified with alkenylalkoxysilane and preparing method of the same

Disclosed herein are a surface modifier for metal oxide particles and a method of modifying the surface of metal oxide particles using the same. The surface modifier consists either of an alkylsilanepolyol containing a cyclic alkyl group capable of imparting steric hindrance or of a mixture of said alkylsilanepolyol with alkylalkoxysilane, and the method of modifying the surface of metal oxide particles comprises coating the surface modifier on the hydrophilic surface of the metal oxide particles through chemical bonding so as to impart hydrophobicity or amphiphilicity (hydrophilicity and hydrophobicity) and reactivity to the surface of the metal oxide particles. Through the use of alkylsilane triol having a specific chemical structure, surface-modified metal particles having uniform particle size distribution can be provided not only by inhibiting the condensation and agglomeration of the surface modifier itself during a high-temperature condensation reaction for inducing the chemical bonding between metal oxide and the modifier, but also by stabilizing silicon-hydroxyl (Si&#x2014;OH) bonds.

Surface modifiers and process for surface modifications of particles of metal oxide using the same

Provided are a saturated N-heterocyclic carbene-ligand metal complex derivative, a method for preparing the same, and a method for preparing a silane compound by hydrosilylation using the same as a catalyst. To describe in more detail, the metal complex derivative has a saturated N-heterocyclic carbene derivative and an olefin ligand at the same time. A silane compound is prepared by hydrosilylation in the presence of the metal complex derivative as a catalyst. The provided metal complex derivative of the present invention has superior stability during hydrosilylation reaction and is capable of effectively performing the hydrosilylation reaction at low temperature even with small quantity. Further, a product with superior regioselectivity may be obtained. In addition, after the hydrosilylation reaction is completed, the metal complex derivative may be recovered and recycled.

Saturated N-heterocyclic carbene-ligand metal complex derivatives, preparing method thereof, and preparing method of silane compound by hydrosilylation reaction using the same as catalyst

Provided is a method of preparing allylchlorosilane, and more particularly, a method of preparing allylchlorosilane with high yield by Si&#x2014;C coupling reaction of an allyl chloride derivativce with a hydrosilane derivative under specific reaction conditions without using a catalyst.

Method of preparing allylchlorosilane derivative

Provided are a functional reinforcing filler and a method of preparing the same, and more particularly, a functional reinforcing filler including inorganic particles having a surface modified by an organic silanepolyol obtained by hydrolyzing an organic alkoxysilane compound and a method of preparing the sane. The functional reinforcing filler has hydrophobicity and reactivity. If the functional reinforcing filler is used to prepare rubber, a coupling agent is not required, and the rubber does not emit volatile organic compounds (VOCs). In particular, a tire prepared using the functional reinforcing filler may have low rolling resistance and excellent wet traction.

Functional reinforcing filler and method of preparing the same

The present invention relates to (2-cyclopentenyl)chlorosilane derivatives and the preparation method thereof. In particular, it relates to a very economical process which reacts cyclopentadiene, which is formed by a cracking of industrially produced low-priced dicyclopentadiene, with a silane compound containing silicon-hydrogen bonds at elevated temperature in a hydrocarbon compound with a boiling point of a predetermined range, thus also enabling to prevent problematic production of dicyclopentadiene polymer by using the hydrocarbon compound. Further, in the presence of a group 10 metal compound catalyst, the process herein is capable of lowering the reaction temperature and increasing the yield in the reaction of sterically hindered alkyl-dichlorosilane. The (2-cyclopentenyl)chlorosilane may be useful in preparing an organic silicon compound containing an unsaturated group or a functional silicone polymer using the same, or in modifying the surface or manufacturing a thin layer.

(2-cyclopentenyl)chlorosilanes and their preparation methods

The present invention relates to a &#x3c9;-[2-(polyalkyleneoxy)ethylthio]alkylalkoxysilane derivative and a preparation method thereof, more particularly to a &#x3c9;-[2-(polyalkyleneoxy)ethylthio]alkylalkoxysilane derivative prepared by transforming a (&#x3c9;-mercaptoalkyl)alkylalkoxysilane compound into a &#x3c9;-(alkoxysilyl)alkylthiolate metal salt by treating it with a metallic base and performing dehalometallation at low reaction temperature using a poly(alkyleneoxy)alkyl ether halide or a poly(alkyleneoxy)bis(haloalkyl) ether to form a carbon-sulfur bond and a preparation method thereof. The novel compound of the present invention has not only a Si&#x2014;OR bond but also contains a sulfur atom in the molecule, so that it can be used as monomer for synthesizing hydrophilic functional silicon polymers, source material of silicon-based surfactants and surface modifier of organic/inorganic materials. In addition, the preparation method of the compound is an economical one as the reaction can be performed at room temperature, the production yield is high and the reaction byproduct (metal halide) can be easily removed by filtration.

&#x3c9;-[2-(polyalkyleneoxy)ethylthio]alkylalkoxysilane derivative and preparation method thereof

This invention relates to (organothiomethyl)chlorosilanes and methods for their preparation by the dehydrohalogenative Si&#x2014;C coupling reaction of oranothiomethyl halides with Si&#x2014;H containing chlorosilanes (hydrosilanes), wherein a mixture of oranothiomethyl halide and hydrosilane is heated in the presence of tertiary amine or organic salts (quaternary organoammonium and organophosphonium halides to give (organothiomethyl)chlorosilanes, which is existing a sulfur atom in alkyl chain, (formula: RSCHSiClR) in good yield. wherein Rrepresents a hydrogen atom, halogen, or C&#x2013;Calkyl; Ris selected from the group consisting of C&#x2013;Calkyl or an aryl group. Especially, this reaction using organic salt as a catalyst provide better economical matter and yield compared with conventional methods, because only catalytic amount of organic salt is required and the catalyst can be separated from the reaction mixture and recycled easily.

(Organothiomethyl)chlorosilanes and their preparation methods

A method for preparing alkyldichlorosilanes having a Si&#x2014;H bond by directly reacting metallic silicon with a mixture of alkyl chloride and (i) hydrogen chloride, or (ii) an alkyl chloride which can generate hydrogen chloride at a reaction temperature in the presence of copper catalyst.

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Seoul, South Korea

Bok Ryul Yoo