Korea Institute of Geoscience and Mineral Resources

Other

Hee-Dong Jang

Han-Kwon Chang

Ji-Hyuk Choi

Sun-Kyung Kim

Ho-Sung Yoon

Dae-Sup Kil

Seong-Kil Kim

An embodiment of the present invention provides a method for preparing a silicon-carbon-graphene composite, comprising the steps of: (step 1) adding a carbon precursor solution to silicon and performing wet grinding so as to prepare a suspension: (step 2) forming a silicon-carbon composite by spray drying the suspension; and (step 3) spray drying and heat treating a solution comprising the silicon-carbon composite and graphene oxide.

Method for preparing silicon-carbon-graphene composite, composite prepared according thereto, and secondary battery to which same is applied

A method for preparing graphene balls, the method including, Such graphene can be applied to various fields due to excellent physical and chemical characteristics.

Method for manufacturing graphene balls

Provided is a glucose sensor including a titanium dioxide-graphene composite having a porous structure. More particularly, the glucose sensor includes a working electrode having the titanium dioxide-graphene composite having the porous structure and an enzyme to provide features that allow a current flow to be excellent, a current to be sensitively changed depending on a change in electric potential, sensitivity to be high, and a low voltage characteristic to be excellent.

Glucose sensor having titanium dioxide-graphene composite

There is provided a method of preparing silica (SiO) nanoparticles from siliceous mudstone which is silica mineral sources, using a chemical reaction. The method of preparing silica nanoparticles from siliceous mudstone comprises: solving a silica constituent into a sodium silicate aqueous solution by a sodium hydroxide leaching reaction of the siliceous mudstone (S); performing ion exchange to remove a sodium constituent from the sodium silicate aqueous solution and to prepare a silicate aqueous solution (S); and performing flame spray pyrolysis to prepare silica nanoparticles with an average particle dimension being in a range of 9 to 57 nm from the silicate aqueous solution. The present invention provides the method of preparing nanoparticles from siliceous mudstone by preparing the silicate aqueous solution from the siliceous mudstone by the chemical reaction and ion exchange process, and spraying the silicate aqueous solution being aerosolized and injecting generated liquid droplets of the solution into a flame reactor.

Method of preparing silica nanoparticles from siliceous mudstone

A method for producing nano-sized titanium dioxide (TiO ) ultrafine powder from titanium tetrachloride (TiCl ) in the vapor phase by the gas phase oxidation reaction using flames, in which the method comprises: simultaneously introducing titanium tetrachloride (TiCl ), vapor, argon, oxygen, hydrogen and air into a five-piped flame reactor to form a flame having a temperature of greater than 1,000&deg; C.; and producing nano-sized titanium dioxide ultrafine powder having an average particle size of less than 50 nm.

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Daejeon, South Korea

Hee-Dong Jang