Seoul National University

Other

Snu Rdb Foundation

Kug Sun Hong

Hyun Joong Yu

Dong Ho Lee

Choon Ki Lee

Bong Soon Chang

Dong-Wan Kim

Jae Hyup Lee

Jun Hyuk Seo

Ki Tae Nam

Hwan Chul Kim

Ki Soo Park

In Sun Cho

Hae Lin Jang

Deug Joong Kim

Sang-Gu Kang

Kyoung Suk Jin

Jin Young Kim

Dong-Ho Lee

Dong Wook Kim

Su Jin Kim

Dong Soo Lee

Sang Wook Lee

Su-Jin Kim

Hyun Seung Ryu

Jingming Xu

Jung-kun Lee

Jun Hong Noh

Dong Wan Kim

Sang Lim Lee

Jimin Park

Chin Moo Cho

Hee Bum Hong

Do-Kyun Kwon

Tae-Youl Yang

Hui-Yun Jeong

Jeong Ryeol Kim

Sung Soo Chung

Shin Tae Bae

Duk Kyu Lee

Chae Hyun Kwak

Tae Hoon Noh

Hyun-Seok Jung

Jae-Yun Lee

Hee-Bum Hong

Soung-Jun Yoon

Jung-Kun Lee

Hyun-Seung Ryu

Jeong-Ryeol Kim

Hyun-Woo Jung

Chang Kyun Lim

This invention relates to whitlockite and a method for manufacturing the same. The method includes adding, to water, a calcium ion supplying material and a cation supplying material containing a cation (X) other than the calcium ion to prepare a cation aqueous solution, adding a phosphoric acid supplying material to the cation aqueous solution, and aging the cation aqueous solution including the phosphoric acid supplying material. As a result, whitlockite having high purity and high crystallinity can be mass produced using a simple process.

Whitlockite and method for manufacturing the same

Provided is a method of manufacturing porous ceramic bodies with gradient of porosity, in which a gradient that is continuous to a pore size and porosity is precisely controlled in a simple way. The method includes the steps of: obtaining molded bodies by pressurizing and molding a mixture of powder obtained by mixing ceramic powder and polymer powder at a weight ratio of 1:1 to 100:1; and obtaining sintered bodies with gradient of porosity by sintering the molded bodies while applying a gradient pressure to the molded bodies.

Method for manufacturing porous ceramic bodies with gradient of porosity

Disclosed herein is a light-responsive photocatalyst composition, which is a composite oxide semiconductor containing tungsten, and which can efficiently absorb visible light emitted from the sun and light emitted from interior lamps, such as fluorescent lamps, etc., and a method of preparing the light-responsive photocatalyst composition. The visible light-responsive photocatalyst composition can decompose volatile organic compounds or harmful organic matter causing sick house syndrome, even indoors, because it can be activated by visible light outdoors and can respond to light emitted from interior lamps, such as fluorescent lamps, etc.

Visible light-responsive photocatalyst composition containing tungsten-based oxides and method of producing the same

Disclosed herein is a biodegradable and bioactive glass-ceramic fabricated by mixing a slowly biodegradable glass-ceramic and a highly biodegradable glass-ceramic in a predetermined mixing ratio wherein the bioactivity is maintained to be constant, and the biodegradation rate is controlled by the mixing ratio. The biodegradable and bioactive glass-ceramic is fabricated from a composition consisting of calcium oxide (CaO), silica (SiO), boron oxide (BO), magnesium oxide (MgO), calcium fluoride (CaF) and phosphorus pentoxide (PO).

Biodegradable and bioactive glass-ceramics, and method for fabricating the same

Disclosed is a method for producing a transparent and homogenized polymeric sol of a calcium phosphate compound, containing apatite and having excellent wettability and bioactivity, according to a sol-gel synthesis, and a method for coating the polymeric sol on a metal implant, in which the polymeric sol is coated on the metal implant and then heat-treated to form a dense coated layer strongly bonded to the metal implant. The polymeric sol is obtained by process of preparing a calcium salt solution, containing calcium ethoxide dissolved in organic acid, and a phosphate solution, containing triethyl phosphite or triethyl phosphate dissolved in the organic acid, mixing the calcium salt solution with the phosphate solution to produce a mixed solution, and aging the mixed solution.

Method for producing polymeric sol of calcium phosphate compound and method for coating the same on a metal implant

Disclosed herein are a self-foamed porous ceramic composition and a method for making a porous ceramic using the self-foamed porous ceramic composition. The self-foamed porous ceramic is obtained by fabricating a glass consisting of 41&#x2dc;47 mole % of calcium oxide (CaO), 41&#x2dc;47 mole % of silica (SiO) and 6&#x2dc;18 mole % of borate (BO), pulverizing the glass into a finely-divided glass powder having an average particle size of 1&#x2dc;10 &#x3bc;m, molding the glass powder, and sintering the molded glass powder.

Self-foamed porous ceramic composition and method for making porous ceramic using the same

Disclosed herein is a phosphate-based dielectric ceramic composition which has a low dielectric constant and a low dielectric loss in the high-frequency bands such as microwave and millimeter wave. The composition is represented by the following formula: (1-x)(A'A&#x2033;)O-xPOwherein x and y are numbers satisfying the following conditions: 0 &#x3c;&#xd7;&#x3c;1 and 0&#x2266;y&#x2266;1, and A&#x2032; and A&#x2033; are each independently selected from the group consisting of Ca, Ba, Sr, Zn, Mb, Ni, Mn and Cu. The composition may further include a sintering assistant and an additive. Since the composition can be sintered at a temperature as low as 1,000&#xb0; C., it can be simultaneously calcined together with a metal electrode such as silver, copper or silver/palladium electrode.

Phosphate-based ceramic compositions with low dielectric constant and method for manufacturing dielectric substrate using the same

A bone graft substitute using magnesium substituted calcium phosphate compounds and a method of manufacturing the same is provided in which the bone graft substitute is used for recovering bones damaged due to a bone fracture. The method of manufacturing a bone graft substitute includes the steps of mixing powdered calcium pyrophosphate and a magnesium included compound to thereby obtain a composition, pressure-forming the compositions to obtain a plastic body; and sintering the plastic body.

Artificial bone graft substitute using calcium phosphate compounds and method of manufacturing the same

Disclosed is a deodorizer composition comprising magnesium and calcium phosphate compounds, capable of effectively removing various malodorous components from the atmosphere.

Ceramic deodorizer

Disclosed is a dielectric ceramic composition suitable for use in planar or multilayer type electronic parts containing inner conductors, for the fabrication of which simultaneously sintering base materials and conductors is required. This ceramic composition is composed of (1&minus;x)Ba Ti Nb O &minus;(x)Ba(or Sr)Nb O (0<x<1)

Dielectric ceramic composition and method for manufacturing the same

A dielectric ceramic composition comprising 3BaO.5TiO,.3Nb,O,(Ba,Ti,Nb,O,) as a main component and at least one selected from, as a minor component, (b-1) sintering auxiliary selected from the group consisting of a boron-containing glass compound, CuO, ZnO or mixtures thereof, or (b-2) additives selected from the group consisting of V,O,, SnO,, MgO, NiO, Sb,O,, Bi,O,, LiF, Ag,O or mixtures thereof, and mixtures of (b-1) and (b-2), and its preparation process are disclosed.

Dielectric ceramic compositions and method of preparation therefor

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Seoul, South Korea

Kug Sun Hong