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Sol-Gel Process를 이용한 SiO<sub>2</sub>/TiO<sub>2</sub> 복합 미립자의 합성
구상만,이동현,류창석,이용은,Koo, S.M.,Lee, D.H.,Ryu, C.S.,Lee, Y.E. 한국공업화학회 1997 공업화학 Vol.8 No.2
응집이 없는 단분산의 $SiO_2/TiO_2$ 복합 미립자를 얻기 위하여 $TiO_2$seed가 분산되어 있는 에탄올 수용액과 TEOS (Tetraethyl Orthosilicate)를 에탄올에 녹인 용액을 혼합하여 $TiO_2$ 주위에서 TEOS가 가수분해 및 축합 반응이 일어나도록 유도하여 복합 미분말을 제조하였다. 촉매로 암모니아를 사용하였고, 반응온도는 실온이었다. 반응변수는 TEOS의 농도, 암모니아의 농도, $TiO_2$ seed의 크기 및 양이었다. 응집이 없는 복합 미립자를 얻기 위한 최적조건은 [TEOS]=0.3M, [$NH_4OH$]=0.7M, $TiO_2$ seed의 크기가 200~300 nm이었고, 이때 $0.8{\sim}0.9{\mu}m$의 입자크기를 갖는 복합입자를 얻을 수 있었다. Monodisperse, spherical $SiO_2/TiO_2$ composite fine powders were prepared by modified Sol-Gel process which $TiO_2$ fine Powders was used as a seed particles for condensation of TEOS (Tetraethyl Orthosilicate). The reaction was carried out under $N_2$ atmosphere at ambient temperature using $NH_3$ as a catalyst. Ethanol was used as a solvent. Drying process was carried out with vacuum trap which cooled by liquid $N_2$. The reaction variables were the concentration of TEOS, the concentration of ammonia, the size of $TiO_2$ seed and molar ratio of $SiO_2/TiO_2$. The optimum condition for the preparation of $SiO_2/TiO_2$ composite fine powders without agglomeration was [TEOS]=0.3M, [$NH_3$]=0.7M, size of $SiO_2/TiO_2$ seed = 200~300nm.
Sol - Gel process 를 이용한 SiO2 / TiO2 복합 미립자의 합성
구상만,이동현,류창석,이용은 ( S . M . Koo,D . H . Lee,C . S . Ryu,Y . E . Lee ) 한국공업화학회 1997 공업화학 Vol.8 No.2
응집이 없는 단분산의 SiO₂/TiO₂ 복합 미립자를 얻기 위하여 TiO₂ seed가 분산되어 있는 에탄올 수용액과 TEOS(Tetraethyl Orthosilicate)를 에탄올에 녹인 용액을 혼합하여 TiO₂ 주위에서 TEOS가 가수분해 및 축합 반응이 일어나도록 유도하여 복합 미분말을 제조하였다. 촉매로 암모니아를 사용하였고, 반응온도는 실온이었다 반응변수는 TEOS의 농도, 암모니아의 농도, TiO₂ seed의 크기 및 양이었다. 응집이 없는 복합 미립자를 얻기 위한 최적조건은 [TEOS]=0.3M, [NH₄OH]=0.7M, TiO₂seed의 크기가 200∼300 nm이었고, 이때 0.8∼0.9㎛의 입자크기를 갖는 복합입자를 얻을 수 있었다. Monodisperse, spherical SiO₂/TiO₂ composite fine powders were prepared by modified Sol-Gel process which TiO₂ fine powders was used as a seed particles for condensation of TEOS (Tetraethyl Orthosilicate). The reaction was carried out under N₂ atmophere at ambient temperature using NH₃ as a catalyst. Ethanol was used as a solvent. Drying process was carried out with vacuum trap which cooled by liquid N₂. The reaction variables were the concentration of TEOS, the concentration of ammonia, the size of TiO₂ seed and molar ratio of SiO₂/TiO₂. The optimum condition for the preparation of SiO₂/TiO₂ composite fine powders without agglomeration was [TEOS]=0.3M, [NH₃]=0.7M, size of TiO₂ seed = 200∼300nm.
Stable antimony-doped tin oxide nano-sols and their films produced by a sol-coating method
구상만,Seong Je Jeon,Jai Joon Lee,Jun Tae Kim 한양대학교 세라믹연구소 2006 Journal of Ceramic Processing Research Vol.7 No.4
The preparation of ethanol-based antimony-doped tin oxide (ATO) nano-sols and their films are described. Aggregates of antimony-doped tin oxide (ATO) nanoparticles were synthesized by a hydrothermal method in an autoclave. After peptization with tetramethylammonium hydroxide and solvent-exchange to ethanol, highly stable ethanol-based ATO nano-sols with solid contents up to 20 wt% were prepared. Transparent ATO films were formed on polyethylene terephthalate (PET) films using the ATO nano-sol by a spin coating method. The effects of antimony content and solid content on packing density and the resistivity of the ATO films were studied. The preparation of ethanol-based antimony-doped tin oxide (ATO) nano-sols and their films are described. Aggregates of antimony-doped tin oxide (ATO) nanoparticles were synthesized by a hydrothermal method in an autoclave. After peptization with tetramethylammonium hydroxide and solvent-exchange to ethanol, highly stable ethanol-based ATO nano-sols with solid contents up to 20 wt% were prepared. Transparent ATO films were formed on polyethylene terephthalate (PET) films using the ATO nano-sol by a spin coating method. The effects of antimony content and solid content on packing density and the resistivity of the ATO films were studied.
Effect of Alcohol Chain Length on Particle Growth in a Mixed Solvent System
구상만,하회진,이영식,Joon Sang Park 한양대학교 세라믹연구소 2006 Journal of Ceramic Processing Research Vol.7 No.1
The preparation of microsized uniform silica particles by the hydrolysis and condensation of concentrated tetraethylorthosilicate (TEOS) solutions has been studied in various solvent systems (methanol and ethanol with various long-chain alcohols). Ammonium hydroxide was used not only to initiate hydrolysis and condensation of TEOS, but also to provide the particles with a negative, stabilizing surface charge. Long-chain alcohol was introduced to control the hydrolysis/condensation rate and to reduce the polarity of the system (modified seed growth), as well as to stabilize large particles. To prepare large particles with good uniformity, the solvent composition is important because it determines the stability of both small oligomers and grown particles. The concentration of small seed particles suspended in a solvent and the amount of monomer are also found to be important process parameters in controlling the size and morphology of microspheres. No salt was added to change the surface potential of silica particles. Monodispersed spherical silica particles over 2 μm could be obtained. Moreover, a turbidity experiment showed that the silica growth and nucleation proceeded mainly through the reaction of small oligomers rather than monomeric species.
구상만,천병수,추광율,Koo Sang Man,Chun Byung Soo,Choo Kwang Yul Korean Chemical Society 1989 Bulletin of the Korean Chemical Society Vol.10 No.1
The infrared multiphoton decomposition of trichloroethylene-H(TCE-H) and trichloroehtylene-D(TCE-D) was studied by using the high power $CO_2$ laser. The pressure dependence of TCE-H decomposition showed that the HCl elimination channel to form ClC ≡ CCl was the major step at high pressures, while the HC ≡ CCl formation step became important at low pressures. $Cl_2C$ = CHCl ${\rightarrow}$ (high pressure) ClC ${\equiv}$ CCl + HCl ${\rightarrow}$ (low pressure) HC ${\equiv}$ CCl + 2Cl${\cdot}$($Cl_2$) The IRMPD of TCE-H and TCE-D mixtures with 10P(20) laser line showed that optimum conditions of large isotope selectivity were the low system pressures and high laser powers. The experimentally observed dependence of the branching ratios on the pressure and laser fluence, and the isotope selectivity coefficients were quantitatively explained by using the modified energy grained master equations (EGME) model.
Silver complex inks for ink-jet printing: the synthesis and conversion to a metallic particulate ink
구상만,Jai Joon Lee,Jin Chul Park,Min Hwan Kim,Tae Sun Chang,Sun Teak Kim,Young Chul You,Sang Jin Lee 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.3
A solution ink of a silver complex was prepared by dissolving silver neodecanoate in xylene up to a concentration of 25% silver (Ag-SI). Spun-coated Ag-SI films were thermally decomposed to metallic silver films with resistivity values of less than 4.5× 10−5 Ω·cm, after sintering above 160oC. In addition, a silver nanoparticle ink (Ag-PI) could be prepared by removing a large amount of neodecanoic acid from the Ag-SI by reduction with phenylhydrazine. The sintering temperature for Ag-PI with a resistivity below 1×10−4 Ω ·cm was reduced from 160oC to 130oC by using Ag-PI instead of Ag-SI. However, Ag-PI was rather unstable, as a precipitation occurred in one week at room temperature. Finally, Ag-SI was tested for production of a metallic film on a polyamide as a metal complex ink in a drop-on-demand ink jet printer. The results indicated that it would be very suitable as a conducting ink.
Oxo-thiomolybdate 화합물의 합성 및 탈황 촉매 반응의 활성에 관한 연구
구상만 한양대학교 에너지 ·환경기술연구소 1995 에너지·環境技術論文集 Vol.2 No.-
Oxidation of ?? by iodine yields the neutral adduct, Mo₂O₂S₄(DMF)₃, which is converted to heterobimetallic molybdenum sulfide complex by salt formation reaction. The cation exchange reaction of (Et₄N)[??] with NiCl₂ also produces a different type of heterobimetallic complex. The neutral adduct and two heterobimetallic complexes are used as precursors for thiophene HDS reaction. Major products in thiophene HDS are C₄ species for all precursors. Precursors obtained from heterobimetallic complexes show better catalytic activity than one that obtained from Mo₂O₂S₄(DMF)₃. Finally,γ-Al₂O₃ supported catalysts are more active for thiophene. HDS than carbon supported ones.