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임우택 ( Woo Taik Lim ),장병대 ( Byung Dae Jang ),박만 ( Man Park ),정성욱 ( Sung Wook Jung ),장창환 ( Chang Hwan Chang ),허남호 ( Nam Ho Heo ) 한국공업화학회 2002 공업화학 Vol.13 No.7
겔 조성과 합성조건의 조정으로 순수한 제올라이트 Rho 결정들이(gel 조성, 3.11Na : o.31Cs : 1.0AJ : 5.69Si : 55.5H_2O) 유기성 구조유도체 없이 실온에서 5일 동안의 숙성에 의해서 합성되어졌다. 합성된 제올라이트 Rho 결정들의 평균 크기는 약 2㎛로 추정되어졌으며 Si/Al 비는 3.54이었고 물함량은 15.9%이었다(Na_4.96Cs_5.60Si_37.44Al_10.56O_96ㆍ39H_2O). 제올라이트 Rho의 골격은 Si(0AJ), Si(1Al) 및 Si(2Al)로 구성되어져 있는 것으로 나타났으며 약 1000 ℃까지 안정하였다. with the aging time of 5 days at room temperature, in the absence of organic structure-directing agents, nearly pure Rho zeolite was synthesized from a gen composition of 3.11Na : 0.31Cs : 1.0AJ : 5.69Si : 55.5H_2O. This study was conducted to improve the purity of Rho crystals through modification of the gel composition and the process condition. The average size of synthesized Rho crystals was estimated to be ca, 2 ㎛. The formula of zeolite Rho unit cell was found to be Na_4.96Cs_5.60Si_37.44Al_10.56O_96ㆍ39H_2O with Si/Al ratio = 3.54 and 15.9% of water content. The framework of Rho zeolite was composed of Si(0Al), Si(1Al) 및 Si(2Al), and it was thermally stable up to about 1000 ℃.
서성만,서정민,고성운,임우택,Seo, Sung-Man,Suh, Jeong-Min,Ko, Seong-Oon,Lim, Woo-Taik Korean Chemical Society 2011 대한화학회지 Vol.55 No.4
최대 0.20 mm 크기를 가진 아날심 단결정은 $3.00SiO_2$ : $1.50NaAlO_2$ : 8.02NaOH : $454H_2O$ : 5.00TEA의 겔 조성으로부터 합성되어졌다. $Na^+$ 이온으로 완전히 이온교환 된 아날심은 0.1 M 농도의 NaCl 수용액으로부터 준비하였다(이온교환용액의 pH는 NaOH 용액을 첨가하여 6에서 11로 맞추었다). $|Na_{0.94}(H_2O)|[Si_{2.06}Al_{0.94}O_6]-ANA(a=13.703(3){\AA})$의 분자식을 가지는 수화된 아날심 단결정의 구조는 294 K에서 Ibca의 orthorhombic 공간군으로 단결정 X-선 회절기법에 의해 결정되었다. 결정 구조의 최종 에러값은 $R_1/wR_2$= 0.054/0.143에 수렴되었다. 약 15개의 $Na^+$ 이온이 팔면체 배위로 3군데의 비동등한 위치에서 발견되었다. 합성된 아날심의 화학적 조성은 $Na_{0.94}(H_2O)Si_{2.06}Al_{0.94}O_6$ 확인되었으며, Si/Al 비는 단결정 구조 정밀화를 통하여 찾은 양이온의 점유수인 14.79개에 의해 2.19로 결정되었다. Large colorless single crystals of analcime with diameters up to 0.20 mm have been synthesized from gels with the composition of $3.00SiO_2$ : $1.50NaAlO_2$ : 8.02NaOH : $454H_2O$ : 5.00TEA. The fully $Na^+$-exchanged analcime have been prepared with aqueous 0.1 M NaCl (pH adjusted from 6 to 11 by dropwise addition of NaOH). The single-crystal structure of hydrated $|Na_{0.94}(H_2O)|[Si_{2.06}Al_{0.94}O_6]$-ANA per unit cell, a=13.703(3) ${\AA}$, has been determined by single-crystal X-ray diffraction technique in the orthorhombic space group Ibca at 294 K. The structure was refined using all intenties to the final error indices (using only the 1,446 reflections for which $F_o$ > $4{\sigma}(F_o))R_1/wR_2$ = 0.054/0.143. About 15 $Na^+$ ions are located at three nonequivalent positions and octahedrally coordinated. The chemical composition is $Na_{0.94}(H_2O)Si_{2.06}Al_{0.94}O_6$. The Si/Al ratio of synthetic analcime is 2.19 determined by the occupations of cations, 14.79, in the single-crystal determination work.
정용식(Yong Sik Jeong),임우택(Woo Taik Lim),김종현(Jong Hyun Kim),오형석(Hyung Suk Oh),김영훈(Young Hun Kim) 大韓環境工學會 2008 대한환경공학회지 Vol.30 No.12
영가금속을 이용한 아조계 염료의 탈색연구를 수행하였다. 아조계 염료는 대부분 생물학적 독성을 갖고 있으며 생물학적 분해가 어려운 경우가 많다. 색을 제거하기 위한 가장 간단한 방법은 아조결합을 파괴하는 것이며 영가금속을 이용한 환원적 제거가 가능하다. 3종의 염료를(Cibacron Briliant Yellow 3G-P (CBY3G-P), Benzopurpurin 4b (B-4B), Chicago sky blue 6b (CSB6B)) 대상으로 연구하였으며 각 염료의 반응속도는 pH에 매우 의존적이며 낮은 pH에서 반응속도가 증가되었다. 영가철에서 용해된 철이온에 의한 응집 및 침전반응도 색도제거에 기여할 수 있으며 본 연구에서는 그 기여율을 알기 위해 철이온에 의한 제거실험을 수행하였으며 그 기여율은 대상 염료에 따라 편차가 크다는 것을 알 수 있었다. 본 연구에서는 영가철에 의한 환원반응에 의해 아조계 염료가 성공적으로 탈색될 수 있음을 증명하였다. Reductive discolorization studies were conducted. Azo-dyes usually have biological toxicity and it is known that the dyes are hardly removed by biological treatments. One of the simplest way to remove the color is to break the azo-bond and it is possible to break the bond with zero-valent metals. Three types of azo-dyes (Cibacron Briliant Yellow 3G-P (CBY3G-P), Benzopurpurin 4b (B-4B), Chicago sky blue 6b (CSB6B)) were tested. All tested azo-dyes were highly pH dependent and lower pH was preferred. The reaction mechanism was reductive cleavage and amines were expected as products. The dissolved iron ions from zero-valent iron can also remove the color through coagulation and precipitation and a set of experiments were conducted to evaluate the contribution by the dissolved iron. The results indicated that the contribution were also dependent on the type of dyes. This study showed that the reductive cleavage using zero-valent iron could be an alternative for the azo-dye waste water.
롤투롤 스퍼터를 이용하여 PET 기판 위에 제조된 ITO 박막의 색도(b*) 및 투과도 연구
서성만,강보갑,김후식,임우택,최식영,Seo, Sung-Man,Kang, Bo-Gab,Kim, Hu-Sik,Lim, Woo-Taik,Choi, Sik-Young 한국재료학회 2009 한국재료학회지 Vol.19 No.7
Indium Tin Oxide (ITO) thin films on Polyethylene Terephtalate (PET) substrate were prepared by Roll-to-Roll sputter system with targets of 5 wt% and 10 wt% $SnO_2$ at room temperature. The influence of the chromaticity (b*) and transmittance properties of the ITO Films were investigated. The ITO thin films were deposited as a function of the DC power, rolling speed, and Ar/$O_2$ gas flow ratio, and then characterized by spectrophotometer. Their crystallinity and surface resistance were also analyzed by X-ray diffractometer and 4-point probe. As a result, the chromaticity (b*) and transmittance of the ITO films were broadly dependent on the thickness, which was controlled by the rolling speed. When the ITO films were prepared with the DC power of 300 W and the Ar/$O_2$ gas flow ratio of 30/1 sccm using 10 wt% $SnO_2$ target as a function of the rolling speeds 0.01 through 0.10 m/min, its chromaticity (b*) and transmittance were about -4.01 to 11.28 and 75.76 to 86.60%, respectively. In addition, when the ITO films were deposited with the DC power of 400W and the Ar/$O_2$ gas flow ratio of 30/2 sccm used in 5 wt% $SnO_2$ target, its chromaticity (b*) and transmittance were about -2.98 to 14.22 and 74.29 to 88.52%, respectively.
충격기류식 여과집진장치의 운전조건 변화에 따른 적정 탈진주기 및 탈진압력 설정
이덕기 ( Deok-gi Lee ),임우택 ( Woo-taik Lim ),조재환 ( Jae-hwan Cho ),최금찬 ( Kum-chan Choi ),신현무 ( Hyun-moo Shin ),장성호 ( Seong-ho Jang ),서정민 ( Jeong-min Suh ) 한국환경과학회 2018 한국환경과학회지 Vol.27 No.6
In this study, using coke dust from ironwork, the pulse pressure on a pulse air jet bag filter was investigated considering the influence of the pressure loss due to filtration velocity and pressure intervals. The research on the optimal pulse pressure prediction of a pulse air jet type bag filter using coke dust showed the following results. Pressure loss volatility produced by the pulse pressure under low dust concentration(0.5, 1 g/m<sup>3</sup>) and low face velocity(1.25 m/min) was less than 10 mmH<sub>2</sub>O. This suggests that the pulse pressure has a low impact on the pressure loss. In contrast, pressure loss volatility under high dust concentration(3g/m<sup>3</sup>) and high face velocity(1.75 m/min) was 25 mmH<sub>2</sub>O. Therefore, pulse pressure with high dust concentration and high face velocity has a strong influence on the pressure loss volatility, compared to the condition of low dust concentration and low face velocity. The optimal pulse pressure of inlet dust concentration(0.5 g/m<sup>3</sup>) was 6 kg/cm<sup>2</sup> under the same face velocity(1.75 m/min). As concentration increased from 1 to 2 g/m<sup>3</sup>, the pulse pressure gradually reached 5 kg/cm<sup>2</sup> thus indicating that the pulse pressure(5 kg/cm<sup>2</sup>) is pertinent at a high concentration(3 g/m<sup>3</sup>) The pulse intervals: 20, 25 and 30 sec, which are relatively longer than 10 and 15 sec, corresponded to high pressure loss volatility produced by the pulse pressure. Furthermore, low pressure loss volatility was noted at 5 kg/cm<sup>2</sup> of the overall pulse pressure.
롤투롤시스템을 이용하여 PET 필름위에 제조된 SiO<sub>2</sub>-ITO 박막의 색도(b*), 면저항과 투과도 연구
박미영,김정수,강보갑,김혜영,김후식,임우택,최식영,Park, Mi-Young,Kang, Bo-Gab,Kim, Jung-Soo,Kim, Hye-Young,Kim, Hu-Sik,Lim, Woo-Taik,Choi, Sik-Young 한국재료학회 2011 한국재료학회지 Vol.21 No.5
This paper has relatively high technical standard and experimental skill. The fabrication of TCO film with high transparency, low resistance and low chromaticity require exact control of several competing factors. This paper has resolved these problems reasonably well, thus recommended for publication. Indium tin oxide(ITO) thin films were by D.C. magnetron roll-to-roll sputter system utilizing ITO and $SiO_2$ targets of ITO and $SiO_2$. In this experiment, the effect of D.C. power, winding speed, and oxygen flow rate on electrical and optical properties of ITO thin films were investigated from the view point of sheet resistance, transmittance, and chromaticity($b^*$). The deposition of $SiO_2$ was performed with RF power of 400W, Ar gas of 50 sccm and the deposition of ITO, DC power of 600W, Ar gas of 50 sccm, $O^2$ gas of 0.2 sccm, and winding speed of 0.56m/min. High quality ITO thin films without $SiO_2$ layer had chromaticity of 2.87, sheet resistivity of 400 ohm/square, and transmittance of 88% and $SiO_2$-doped ITO Thin film with chromaticity of 2.01, sheet resistivity of 709 ohm/square, and transmittance of more than 90% were obtained. As a result, $SiO_2$ was coated on PET before deposition of ITO, their chromaticity($b^*$) and transmittance were better than previous results of ITO films. These results show that coating of $SiO_2$ induced arising chromaticity($b^*$) and transmittance. If the thickness of $SiO_2$ is controlled, sheet resistance value of ITO film will be expected to be better for touch screen. A four point probe and spectrophotometer are used to investigate the properties of ITO thin films.