• 자원리싸이클링
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• 제20권2호
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• pp.60-66
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• 2011

염화루테늄 용액에서 루테늄의 분리 및 회수를 위한 기초 연구로 TBP 및 Cyanex923을 이용하여 루테늄의 용매추출 거동을 조사하였다. 루테늄의 추출율에 영향을 미칠 수 있는 수용액상의 염산농도 및 염소이온 농도, 유기상의 추출제 농도, 온도 등에 대해서 고찰하였고, 유기상으로 추출원 루테늄의 탈거거동에 대해서도 조사하였다. 또한 백금, 비스무스, 납, 구리, 철, 주석 등과의 혼합용액에서 염산농도에 따라 각 성분들의 추출거동을 조사하였다. 실험결과 루테늄의 추출을 위해서는 Cyanex923이 효과적이었다. 그러나 TBP를 사용할 경우 루테늄의 추출율은 낮으나 백금, 비스무스, 주석 등의 불순물을 제거하는 데는 효과적이었다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.1806-1809
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• 2008

Study that form micro pattern by direct ink jet printing method is getting attention recently. Direct ink jet printing spout fine droplet including nano metal particle by force or air pressure. There is reason which ink jet printing method is profitable especially in a various micro-patterning technology. It can embody patterns directly without complex process such as mask manufacture or screen-printing for existent lithography. In this study, research of a technology that ejects fine droplet form of Pico liter and forms metal micro pattern was carried with inkjet head of piezoelectricity drive system. Droplet established pattern while ejecting consecutively and move on the surface at the fixed speed. Patterns formed in ink are mixed with organic solvent and polymer that act as binder. So added thermal hardening process after evaporate organic solvent at isothermal after printing. I executed high frequency special quality estimation of CPW transmission line to confirm electrical property of manufactured circuit board. We tried a large area printing to confirm application possibility of an ink jet technology.

• 한국산업보건학회지
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• 제1권1호
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• pp.8-15
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• 1991

In order to visualize the distribution of workplace of which mixed solvent level in air exceeded the TLV of 1.0 (ACGIH), 17 thinners used in 44 painting workplaces were analysed with gas chromatography, and their levels in air were compaired with. 1. For detection rate of solvents in thinner was highest in case of toluene (76.4%), and decreased in orders of xylene (70.6%), methylisobutyl ketone (35.3%), acetone (35.3%), methyl ethyl ketone (23.5%), isopropylacohol (17.6%), n-hexane (17.6%), styrene (11.8%), and ethylacetate (11.8%). Average number of solvents detected was 3.0. 2. Detection rates of organic solvent by component category was highest in cases of aromatic hydrocarbons (52.9%), and decreased in orders of ketones (31.4%), alcohols (5.9%), n-hexane (5.9%) and esters (3.9%). The rate by regulatory category, the second category component was detected in 93.9% of total. 3. There was significant correlation (r=0.929, p<0.01)between detection rates of solvents in thinner and in air. 4. Among the total of 44 painting workplace, the rate of them of which level of mixed solvents in air was exceeded was highest in case of aromatic hydrocarbons (29.5%), and decreased in orders of ketones (6.8%), alcohol (2.3%), n-hexane (2.3%), and was highest in guitar painting (71.4%) workplace in case of aromatic hydrocarbons by component category.

• 동의생리병리학회지
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• 제16권5호
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• pp.899-904
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• 2002

For determination of the genotoxicity of VOCs(Volatile Organic Compounds) in water, in vitro Comet assay was performed using 3T3 cells. The selected 5 VOCs; Trichloroethylene(TCE), Tetrachloroethylene(PCE), Carbontetrachloride (CteC), Dichloromethane(DCM) and Chlorofrom(Chl) and mixed solvent(Mix), are the test items for drinking water quality. Author analyzed the genotoxicity of these solvents through their tail length (TL) values. Mix, PCE, Chl, TCE in order had cytotoxicity at the highest concentration, and CCl₄ and DCM had no cytotoxic effect. TCE, CCl₄, Chl, PCE, Mix, DCM had genotoxicity, Chl, PCE, Mix had both cytotoxicity and genotoxicity simultaneously, Cytotoxic effect of mixed organic solvents, compared with that of single component, at each concentration, was influenced by the synergistic effect of the interaction of each organic component.

• 공업화학
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• 제18권3호
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• pp.234-238
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• 2007

기능성 도핑제인 혼합 도판트[sodium di(2-ethylhexyl)sulfosuccinate(DEHSNa) Naphthalenesulfonic acid (NSA), DEHSNa Toluensulfonic acid (TSA), DEHSNa Dodecylbenzensulfonic acid (DBSA)], 혼합 산화제[$(NH_4)_2S_2O_8{\cdot}FeCl_3$, $(NH_4)_2S_2O_8{\cdot}Fe_2(SO_4)_3$]을 사용하여 높은 전기전도도를 갖는 유기용매에 가용성인 폴리피롤을 합성하였다. 산화제로 $(NH_4)_2S_2O_8$ (10wt%/vol.)을 사용한 Ppy-DEHS 분말은 혼합 도판트(DEHSNa NSA, 3 wt%/vol.)와 혼합 산화제[$(NH_4)_2S_2O_8{\cdot}Fe_2(SO_4)_3$, 4 wt%/vol.]을 사용한 경우보다 극성 용매(DMF)에서 높은 용해도를 나타내었다. 그러나, DMF 용매에서 제조된 혼합 도판트[DEHSNa NSA, 16 S/cm]와 혼합 산화제[$(NH_4)_2S_2O_8{\cdot}FeCl_3$, 13 S/cm]을 사용한 Ppy-DEHS 필름의 전기전도도는 $(NH_4)_2S_2O_8$ (2 S/cm)을 사용한 경우보다 더 높게 나타났다. 다양한 조건에서 제조된 Ppy-DEHS 필름의 전하전달은 모두 3차원 VRH mode{$\{{\sigma}_{dc}(T)={\sigma}_oexp[-(T_o/T)^{1/4}]\}$에 부합하였다.

• 자원환경지질
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• 제32권3호
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• pp.307-315
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• 1999

Four organic polymers were mixed with mothmorillonite. Two cationic polymers a hi로 molecular weight polyacrylamide (494C) and a low molecular weight polymer (587C).Two anionic polymers include a high molecular weight polymer (aerotil). Each clay supension series were allowed to stand for 24 hours and were centrifuged, and the clay plugs were washed and dried. The dried samples investigated by XRD, IR and CEC measurement. The suspended clay containing anionic polymers was not flocculated at any concentratuons of polymer. But the suspendions containing two cationic polymers were rapidly flocculated at almost all concentrations. the d(001) spacings of Na-montmorillonite after being with cationic polymer 587C show about 15$\AA$ suggesting the polymers may have entered the interlayer spaces. The polymer 494C-treated sample produced double peaks of about 12 and 15$\AA$ in XRD. It indicates that the high molecular weight polymer. And cationic polymer 494C may be adsorbed mainy on the outside surface of clay, and some polymers may peretrate into olny interlayers in the margin of montmorillonite particles because of its high molecular weught. CEC of polumer 587-treated sample was reduecd mmarkedly suggesting polymer blocks CEC sites. The d(001) spacings of Ca-montmorillonite after being treated with cationic polymers show about 15$\AA$ suggesting that the interlayer spaces have not been expanded. In the experiment using a dilute Ca-bearing solution, the suspended caly containinf anionic polymers was flocculated. The results indicate that the flocculation behavior of montmorillonite-polymer supension depends on not only polymer properties such as concentration, electric charge and molecular weight but also compositions of solvent.

• 대한화학회지
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• 제18권1호
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• pp.31-39
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• 1974

$Mn^{++}, Co^{++} 및 Zn^{++}$용액을 실온에서 양이온 교환수지와 2염기 유기산이 들어 있는 용액에 섞어 넣었다. 방사성 금속이온을 추적자로 사용함으로써 금속이온이 수지층과 용액사이에 어떻게 분배되는가를 조사하였다. 이 분배 비율이 유기산이온 농도에 따라 어떻게 달라지는가를 보아, $Mn^{++}, Co^{++} 및 Zn^{++}$이 수용액, 에탄올-물 및 아세톤-물에서 썩신산, 말론산, 프타르산 및 타르타르산과 사이에 1:1착물을 형성한다고 결론하였다. 또한 본 연구의 결과 이들 착물의 안정도가 다음순으로 증가함을 알았다.$Mn^{++}

• 한국인쇄학회지
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• 제15권1호
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• pp.57-69
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• 1997

The field of printing to use pressurized ink using screen gossamer that is called screen printing. Existing cleaning solvents for the screen printing are the organic solvents containing aromatic compounds and stench. Also, Cleaning method of screen printing are for the most part mixed cleaning method of dipping and polish. In this study, we measured the cleaning efficiency by gravimetric analysis and the property change of gossamer by image analyzer using existing cleaning solvent. Also, we investigated a new cleaning process showing excellent cleaning efficiency using the ultrasonic and vibration cleaning method instead of the exsiting mixed cleaning method.

• Archives of Pharmacal Research
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• 제16권3호
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• pp.180-185
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• 1993

The acid dissociation constants of certain Schiff bases derived from isatin with p-substituted benzoyl hydrazines and somee amino acids of glycine, $\beta$-and $\alpha$-alanine, valine, $\beta$-phenyl-$\alpha$-alanine and anthranilic acid have been detemined potentiometrically at different temperatures in different aquo-organic solvent mixtures (ethnol, dioxane, dimethyl formamide, methanol, acetone and tetrahydrofurance). The pKa values were demonstrated on the light of the different electornic and steric effects of the substituents and the sovlent characteristics. In all the mixed media used, ionization of the compounds decreased by increasing the mole fraction of the organic cosolvent. Theemodynamic parameters $(\Delta{H}^\circ,\;\Delta{G}^\circ,\;\Delta{S}^\circ)$ were evaluated. The structural effects of the investigated compounds on these parameters were reported and discussed.

• 한국결정성장학회지
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• 제13권3호
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• pp.139-144
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• 2003

유기용매로서 에탄올을 함유한 염화니켈 수용액으로부터 니켈 미분말을 제조하고 이들의 산화특성을 검토하였다. 에탄올을 함유한 염화니켈 수용액에서 히드라진의 환원반응은 반응온도에 크게 의존하였다. 히드라진에 의한 환원반응시간은 반응온도가 증가함에 따라 감소하였다. 반응온도를 제어함으로써 입경이 0.1 $\mu\textrm{m}$-1.0 $\mu\textrm{m}$ 범위를 갖는 구형 분말을 얻을 수 있었다. 또한, 반응온도가 증가함에 따라 입경은 다소 증가하였고 조대한 입자들의 존재로 인하여 넓은 입도 분포를 나타내었다. $60^{\circ}C$에서 합성된 니켈 분말의 평균 입경과 비표면적은 각각 0.3 $\mu\textrm{m}$와 31.8 $m^2$/g이었다. $300^{\circ}C$에서 니켈 분말의 중량감소는 $Ni(OH)_2$의 분해반응에 기인한 것이다. $200^{\circ}C$ 공기중에서 가열처리한 경우 내산화성은 합성 분말보다 현저하였다