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Hexanoic acid - crown ether system을 이용한 europium과 yttrium의 용매추출효과의 향상
심대선(Dea-Seon Sim),한혜림(Hye-Rim Han),김세미(Se-Mi Kim),김정훈(Jeong-Hoon Kim),김영운(Young-Wun Kim),정노희(Noh-Hee Jeong),강호철(Ho-Cheol Kang) 한국유화학회 2015 한국응용과학기술학회지 Vol.32 No.1
용매추출법에서 희토류 금속을 효과적으로 분리하기 위해 추출제만 사용하는 것이 아니라 crown ether와 같은 첨가제를 이용하는 연구를 하였다. Host-guest 화합물인 macrocyclic ligand는 금속과 착화물을 형성하는데, 이 때 crown ether의 cavity 크기와 비슷한 크기의 금속 이온들과 안정한 착화물을 형성한다. 이전 연구에서 europium과 yttrium을 분리하기 위해 여러 사슬 길이의 지방산 추출제를 이용한 추출실험을 행하였었다. 이를 토대로 분리효율이 좋지 않았던 hexanoic acid에 크기가 다른 crown ether (18-crown-6 ether, 15-crown-5 ether, 12-crown-4 ether)를 첨가하여 분리효과가 증가하는 것을 연구하였다. hexanoic acid의 농도별로 분리효율을 본 후 가장 분리 효율이 좋은 농도에서 crown ether를 종류와 농도를 다르게 하여 첨가하였다. 그 결과 0.05 M hexanoic acid에서 분리능이1.72으로 가장 높게 나타났고, crown ether를 첨가하였을 시 분리능이 0.002 M 15-crown-5 ether에서가장 높게 나왔으며 기존의 분리능보다 2배 이상 더 높았다. 또한 crown ether를 첨가하였을 때 두 금속이 MLR3·3RH의 형태로 추출되는 것도 확인 할 수 있었다. The synergistic solvent extraction of rare earth elements such as europium and yttrium has been investigated by the extractant with crown ether as an additive. Macrocyclic ligand as host-guest compounds form more stable complexes with metal ions which have the similar size of the cavity of crown ether. In our previous study[14] founded that the extraction used fatty acid of the various alkyl chain length. Based on the results of the previous experiment, the synergistic separation effect of two metals investigated that the hexanoic acid had was the worst extraction effect which added a crown ether such as 18-crown-6 ether, 15-crown-5 ether, and 12-crown-4 ether. In this study, the concentrations of hexanoic acid have showed the separation effect, and then the concentrations and kind of crown ether are performed for synergistic extraction at the hexanoic acid concentration of the highest separation effect. As a results, the separation rate is the highest value of 1.72 at 0.05 M hexanoic acid, and 0.002M 15-crown-5 ether is the best value in other concentrations and kind of crown ether, it is about twice of using only hexanoic acid. Moreover, the extraction species of two metals has been founded MLR3·3RH form when added the crown ether.
정노희(Noh Hee Jeong),문영진(Young Jin Moon),이향우(Hyang Woo Lee),김홍수(Hong Soo Kim) 한국유화학회 2002 한국응용과학기술학회지 Vol.19 No.1
N/A Microemulsion is stable to aggregation, sedimentation, fusion and has 3nm∼20nm of particle size which is transparent and semitransparent. The isoflavone as a derivatives of Flavone is colorless crystalline compounds. It has similar basic structure to steroid materials which is hormone that acts to skin physiological phenomenon. On this study, we tried to search and demonstrate system content rate of dermal translocation system for cosmetics using O/W type microemulsion containing isoflavone. We manufactured O/W microemulsions by phase inversion emulsification method. It`s was found that POE(20) monostearate with HLB value 14 caused microemulsion to be formed, which had 4nm∼18nm of average diameter and 3nm∼33nm of particle size distribution. Apparent viscosities of the microemulsions have increased in proportion to add surfactant dose.
정노희 ( Jeong No Hui ),김홍수 ( Kim Hong Su ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.1
N/A Silver bromide particles from 50 to 200Å in diameter are prepared by mixing two microemulsions contaning the precursor salts AgNO_(3) and KBr. The microemulsions are composed of AOT(bis(2- ethylhexyl) sodium sulfosuccinate), n-heptane and water. The particle diameters are measured on photomicrographs obtained by transmission electron microscopy. the size of the particles is generally larger than that of the water cores. The influence of both the concentration of precursor salts in the water cores of the microemulsion and the size of these water cores on the size of the particles has been studied.
김홍수 ( Kim Hong Su ),정노희 ( Jeong No Hui ) 한국유화학회 2003 한국응용과학기술학회지 Vol.20 No.4
N/A Zinc complexes with bis[2-(o-hydroxyphenyl) naphto[1,2] oxazolato ligands(ZnPBO-4) and its derivatives (ZnPBO-5) were synthesized, and luminescent properties of these materials were investigated. Both the fluorescent emission band and electroluminescent emission band were discussed based on their ligand structure differences. The emission band found that it strongly depends on the molecular structure of introduced ligand. It was tuned from 446 nm to 491 nm by changing the ligand structures. Spreading of the π-conjugation in 2-(o-hydroxyphenyl) group gives rise to a blue shift. The EL properties also showed good consistency with their difference of ligand structure. Bright-blue EL emission with a maximum luminance of 3,100 ㏅/㎡ at 12V, current density, 575 ㎃/㎡ was obtained from the organic light-emitting diodes (OLEDs) using ZnPBO-4 as emitting layer. It was also found that the newly synthesized materials were suitable to be used as emitting materials in organic EL device.