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이윤복,문영태,신동우,김광호,Lee, Yoon-Bok,Moon, Young-Tae,Shin, Dong-Woo,Kim, Kwang-Ho 한국재료학회 2002 한국재료학회지 Vol.12 No.10
Nickel powders were prepared from nickel chloride solution by wet reduction process, and the size control of the particles was investigated with reactant concentration, dispersant agent, and the addition of ethanol as an organic solvent in NiCl$_2$ aqueous solution. The size of the particle decreased with the increase of nickel chloride concentration. Their average particle size were 1.9$\mu\textrm{m}$, 1.6$\mu\textrm{m}$ and $1.5\mu\textrm{m}$ with 0.5M, 0.8M and 1.0M of nickel chloride concentration respectively. The spherical particle was easily controlled by the addition of ethanol as an organic solvent. Especially, in 30 vol% of ethanol, the average particle size and specific surface area were about 0.2$\mu\textrm{m}$ and 8.98m$^2$/g, respectively.
수용액으로부터 표면 수식된 CdSe 나노 입자의 제조 및 특성
김신호,이윤복,김용진,김양도,김인배,Kim, Shin-Ho,Lee, Yoon-Bok,Kim, Yong-Jin,Kim, Yang-Do,Kim, In-Bae 한국재료학회 2006 한국재료학회지 Vol.16 No.11
CTAB(cetyltrimethylammonium bromide)-capped CdSe nanoparticles were prepared by using a 4 : 1(v/v) distilled water-isopropyl alcohol mixture. The cadmium chloride and sodium selenosulfate were used as the cadmium and selenium source. By the analysis of XRD and XPS, the resultant particle was confirmed to be cubic CdSe phase. TEM image showed CdSe nanoparticles with empty core. The CTAB-capped sample showed an maximum absorption at 418nm, blue-shifting compared with bulk CdSe, which indicated stronger quantum confinement effect compared with uncapped sample. From FT-IR analysis, it was found that the presence of the new peaks in the $850{\sim}1250cm^{-1}$ range indicated the existence of chemical bonding between CTAB and surface of CdSe nanoparticles. Also TG analysis indicated that there were two weight-loss steps for the CTAB-capped CdSe nanoparticles. It was suggested that CTAB played a significant role in protecting CdSe nanoparticles.
성명석,이윤복,김용진,김영석,김양도,Sung, Myoung-Seok,Lee, Yoon-Bok,Kim, Yong-Jin,Kim, Young-Seok,Kim, Yang-do 한국재료학회 2006 한국재료학회지 Vol.16 No.3
Cadmium selenide (CdSe) nanoparticles with the diameter of about 3.4nm have been synthesized from the mixed aqueous solution of distilled water and diethanolamine at room temperature. The cadmium chloride ($CdCl_2$), sodium selenosulfate ($Na_2SeSO_3$) were used as the cadmium and selenium source, respectively. The properties of CdSe nanoparticles were characterized by using transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and UV-Vis measurements. CdSe nanoparticles were analyzed to be cubic phase with the absorption excition peaks between 540 and 600 nm. CdSe nanoparticles also showed red-shifted excition peaks with increasing the sonication time. This paper mainly presents the sonication effects on the formation of CdSe nanoparticles prepared from the mixed aqueous solution of distilled water and diethanolamine.
박홍채,이윤복,이철규,오기동 ( Hong Chae Park,Yoon Bok Lee,Cheol Gyu Lee,Ki Dong Oh ) 한국공업화학회 1994 공업화학 Vol.5 No.6
Ar 또는 Ar/H₂, 가스유통(100∼500㎖/min)하에서 ZrSiO₄/C계 및 ZrSiO₄/Al/C계로부터 ZrC/SiC 복합분체의 합성을 1600℃ 온도범위 내에서 시도하고, 이의 생성기구, 생성속도 및 분체특성을 검토하였다. ZrSiO₄/C계에서는 1400℃ 이상에서 ZrO₂(s)와 SiO(g)가 각각 탄소와 경쟁반응하여 ZrC 및 SiC를 생성하였다. ZrC생성을 위한 겉보기활성화에너지는 약 18.5㎉/㏖(1400-1600℃)이었다. 한편 ZrSiO₄/Al/C계에서는 1200℃ 이상에서 ZrO(g)가 Al(l, g) 및 탄소와 반응하여 ZrC를 생성하였으며, 1300℃ 이상에서는 SiO(g)가 Al(l,g) 및 탄소와 환원-탄화반응하여 SiC를 생성하였다. 1600℃, 5시간 반응으로 얻은 생성물은 평균입경 21.8㎛을 갖는 분말로서 ZrC의 격자정수는 4.679Å, 결정자크기는 640Å이었으며 SiC의 격자정수는 4.135Å, 결정자크기는 540Å 정도이었다. The preparation of ZrC/SiC mixed powders from ZrSiO₄/C and ZrSiO₄/Al/C systems was attempted in the temperature range below 1600℃ under Ar or Ar/H₂ gas flow(100-500㎖/min). The formation mechanism and kinetics of ZrC/SiC were suggested and the resultant powders were characterized. In ZrSiO₄/C system, ZrC and SiC were formed by competitive reaction of ZrO₂(s) and SiO(g) with carbon at temperature higher than 1400℃. The apparent activation energy for the formation of ZrC was approximately 18.5㎉/㏖(1400-1600℃). In ZrSiO₄/Al/C system, ZrC was formed by reaction of ZrO(g) with Al(l, g) and carbon at temperature higher than 1200℃, and SiC was formed by reduction-carbonization of SiO(g) with Al(l, g) and carbon at temperature higher than 1300℃. The products obtained at 1600℃ for 5h consisted of ZrC with lattice constant of 4.679Å and crystallite size of 640Å, and SiC with lattice constant of 4.135Å and crystallite size of 500Å. And also, the mean particle size was about 21.8㎛.
최은영,이윤복,신동우,김광호,Choi, Eun-Young,Lee, Yoon-Bok,Shin, Dong-Woo,Kim, Kang-Ho 한국재료학회 2002 한국재료학회지 Vol.12 No.11
Silica powders were prepared from $SiCl_4$-$H_2$O system by chemical vapor deposition process, and investigated on size control of the products with reaction conditions. The products were amorphous and nearly spherical particles with 130nm~50nm in size. The size distribution became narrow with the increase of [$H_2$O]/[SiCl$_4$] concentration ratio. The particle size decreased with the increase of reaction temperature, [$H_2$O]/[SiCl$_4$] concentration ratio and total flow rate. The specific surface area measured by BET method was about three times larger than that of electron microscope method.
비수용성 매질로부터 Ni(OH)<sub>2</sub> 반응슬러리의 환원반응에 의한 니켈 분말의 제조
최은영,이윤복,윤석영,김광호,김진천,임영목,김형국,김양도,Choi Eun Young,Lee Yoon Bok,Yoon Suk Young,Kim Kwang Ho,Kim Jin Chun,Rhyim Young Mok,Kim Hyong Kuk,Kim Yang Do 한국재료학회 2005 한국재료학회지 Vol.15 No.5
Nickel Powders were synthesized by the reduction of $Ni(OH)_2$ reactant slurries from nonaqueous media, and the morphological characteristics of nickel powders with the addition of NaOH, the composition of mixed solvents, reaction temperature and reaction time were investigated. The NaOH addition changed the structure of agglomeration in the submicron range. As the volume ratio of TEA to DEA increased, the powders slightly suppressed the agglomeration between particles and their size increased. The reaction temperature on size and shape of nickel powders was significant. As reaction time was shortened from 40 min to 0.3 min at $220^{\circ}C$, size distribution of nickel powders was transferred to a narrow size distribution owing to the presence of smaller particles with below $1.0\;{\mu}m$.
DEA 용액에서 암모니아를 함유한 염화니켈 수용액으로부터 니켈 분말의 입경 제어
최은영,이윤복,윤석영,김광호,김진천,임영목,김형국,김양도,Choi Eun Young,Lee Yoon Bok,Yoon Suk Young,Kim Kwang Ho,Kim Jin Chun,Rhyim Young Mok,Kim Hyong Kuk,Kim Yang Do 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.3
Nickel powders were synthesized by the hydrazine reduction of nickel chloride solution containing ammonia in DEA solutions. The size distribution of nickel powders were investigated as a function of ammonia concentration, hydrazine concentration and the mixed composition ratio of diethanolammine (DEA) and triethanolammine (TEA). Nickel powders with the size in submicron range were obtained at $185^{\circ}C$ for 45 minutes by hydrazine reduction of nickel chloride solution in DEA solutions. The hydrazine concentrations showed significant effects on the particle size and shape distribution of nickel powders under $NH_3/Ni^{2+}$ molar ratio of 2.0 condition. As the mixed volume ratio of TEA and DEA increased, nickel powders with relatively larger particle size and low agglomeration were obtained. Nickel powders with particle size in the ranged from 0.4 to $0.9\;{\mu}m$ were obtained at the 50 $vol.%$ of TEA.
In-Situ-Template-Interface Reaction (ISTIR)법에 의한 CdSe 중공 입자의 형성
최문희,이윤복,김형국,임영목,김진천,김영석,김양도,Choi Moon-Hee,Lee Yoon-Bok,Kim Hyong-Kuk,Rhyim Young-Mok,Kim Jin-Chun,Kim Young-Seok,Kim Yang-Do 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.4
CdSe hollow sphere with average size of about 30-50 nm was synthesized from the mixed solution of cadmium chloride $(CdCl_2)$, sodium selenosulfate $(Na_2SeSO_3)$ and ethylenediamine(EDA, $H_2NCH_2CH_2NH_2$) at room temperature. The molar ratio of EDA to $Cd^{2+}$ showed the most significant effect on the morphology of CdSe hollow sphere. This paper will present and discuss the possible formation mechanism of CdSe hollow sphere based on the observation of morphological changes.