• Title, Summary, Keyword: ionic liquids

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Liquid Extraction of Succinic Acid by Aqueous Two-Phase Systems Composed of Piperidinium Ionic Liquids and Phosphate Salt (피페리딘계 이온성 액체와 포스페이트 염으로 구성된 수상이성분계를 이용한 숙신산의 추출)

  • Lee, Woo Yun;Hong, Yeon Ki
    • Korean Chemical Engineering Research
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    • v.54 no.1
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    • pp.52-56
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    • 2016
  • As an effective method for extraction of succinic acid, aqueous two-phase systems based on piperidinium ionic liquids were used in this study. Effects of the alkyl chain length of cation in piperinidium ionic liquids on phase diagram and extraction efficiencies were investigated. Experimental results show that aqueous two phase systems can be formed by adding appropriate amount of piperidinium ionic liquids to aqueous $K_2HPO_4$ solutions. It can be found that the ability of piperidinium ionic liquids for phase separation followed the order [OMPip][Br]>[HMPip][Br]>[BMPip][Br]>[EMPip][Br]. The biphase-forming ability of piperidinium ionic liquids was higher than that of imidazolium and pyrrolidinium ionic liquids in the presence of $K_2HPO_4$. 75~95% of the succinic acid could be extracted into the ionic liquid-rich phase in a single-step extraction. There was little difference in the extraction efficiency of succinic acid by piperidinium ionic liquids comparing to other ionic liquids such as imidazolium and pyrrolonidium ionic liquids. This aqueous two phase system by piperidinium ionic liquid is suggested to have effective application for the separation of succinic acid.

Synthesis of TiO2 Hollow Microspheres Using Ionic Liquids (이온성액체를 이용한 이산화티타늄 미세중공체 합성)

  • Hong, Kiwon;Yoo, Kyesang
    • Applied Chemistry for Engineering
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    • v.22 no.3
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    • pp.340-342
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    • 2011
  • $TiO_2$ hollow microsphere was simply synthesized using various ionic liquids. Shapes and sizes of hollow microspheres were significantly different with the composition of ionic liquids. This is mainly attributed to the interaction between the organic solvent and the ionic liquid at the interface leading to the formation of micropsphere. Among the ionic liquids, 1-butyl-3-methylimidazolium tetrafluoroborate was the most effective to synthesize the hollow microsphere.

Extraction Equilibrium of Acrylic Acid by Aqueous Two-Phase Systems Using Hydrophilic Ionic Liquids (친수성 이온성 액체를 이용한 수상이성분계에서의 아크릴산 추출 평형)

  • Lee, Yong Hwa;Lee, Woo Youn;Kim, Ki-Sub;Hong, Yeon Ki
    • Korean Chemical Engineering Research
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    • v.52 no.5
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    • pp.627-631
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    • 2014
  • As an effective method for extraction of acrylic acid, aqueous two-phase systems based on morpholinium ionic liquids were used in this study. Effects of the alkyl chain length of cation in morpholinium ionic liquids on phase diagram and extraction efficiencies were investigated. Experimental results show that aqueous two phase systems can be formed by adding appropriate amount of morpholinium ionic liquids to aqueous $K_2HPO_4$ solutions. It can be found that the ability of morpholinium ionic liquids for phase separation followed the order [HMMor][Br]>[OMMor][Br]>[BMMor][Br]>[EMMor][Br]. There was little difference between binodal curves of imidazolium ionic liquids and those of morpholinium ionic liquids. 50~90% of the extraction efficiency was observed for acrylic acid by aqueous two phase extraction of acrylic acid with morpholinium ionic liquids. It can be concluded that morpholinium ionic liquids/$K_2HPO_4$ were effective for aqueous two phases extraction of acrylic acid comparing to imidazolium ionic liquids/$K_2HPO_4$ systems because of their lower cost.

Effect of Room Temperature Ionic Liquids Adsorption on Electromechanical Behavior of Cellulose Electro-Active Paper

  • Mahadeva, Suresha K.;Yi, Chen;Kim, Jae-Hwan
    • Macromolecular research
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    • v.17 no.2
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    • pp.116-120
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    • 2009
  • The cellulose smart material called electro-active paper (EAPap) is made by regenerating cellulose. However, the actuator performance is degraded at low humidity levels. To solve this drawback, EAPap bending actuators were made by activating wet cellulose films in three different room-temperature ionic liquids: l-butyl-3-methylimidazolium hexaflurophosphate ($BMIPF_6$), 1-butyl-3-methylimidazolium chloride (BMICL) and 1-butyl-3-methylimidazolium tetrafluroborate ($BMIBF_4$). In the results, the actuator performance was dependent on the type of anions in the ionic liquids, in the order of $BF_4$>Cl>$PF_6$. The BMIBF 4-activated actuator showed the maximum displacement of 3.8 mm with low electrical power consumption at relatively low humidity. However, the BMICL-activated actuator showed a slight degradation of actuator performance. Further performance and durability improvement will be possible once various ionic liquids are blended with cellulose.

CO2 Absorption in Ionic Liquids (이온성액체를 활용한 이산화탄소 회수)

  • Jeong, Soon Kwan;Kim, Dae Hoon;Baek, Il Hyun;Lee, Si Hyun
    • Korean Chemical Engineering Research
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    • v.46 no.3
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    • pp.492-497
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    • 2008
  • The solubility of carbon dioxide in ionic liquids and amine solvents has been investigated in gas-liquid absorption equilibrium reactor. Absorption capacity and kinetics of $CO_2$ with $CO_2$ pressure and absorption time in 9 different ionic liquids and 2 kinds of amine solvents were evaluated. In order to understand the effect of ionic type, we changed the cation or anion of ionic liquids. $CO_2$ absorption capacity and absorption rate of amine solvents were higher than those of ionic liquids. $CO_2$ absorption capacity of [emim][$Tf_2N$], $0.14molCO_2/mol\;IL$ at 1 bar, was the highest among the ionic liquids. $CO_2$ absorption capacity of ionic liquid steeply decreased with increasing temperature. Anion of ionic liquid dominates interaction with $CO_2$ and cation plays secondary role.

Structural Analysis of Conductive Polypyrroles Synthesized in an Ionic Liquid

  • Song, Eun-Ah;Jung, Woo-Gwang;Ihm, Dae-Woo;Kim, Jin-Yeol
    • Bulletin of the Korean Chemical Society
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    • v.30 no.5
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    • pp.1009-1011
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    • 2009
  • Nano-structured conducting polypyrroles were synthesized in the ionic liquids (ILs) based on 1-alkyl-3-methylimidazolium family with tetrachloroferrate as an anion ($C_n\;mim\;[FeCl_4]\;with\;n\;=\;4,\;8,\;and\;12$). The polypyrrole nanostructures synthesized in ILs were formed as spherical shapes. For ionic liquids with alkyl side chain length $C_4,\;C_4\;mim\;[FeCl_4]$, the size of particles was ranged around 60-nm with a relatively narrow size distribution. As the length of alkyl chain increases, the particle sizes become larger and their distributions become wider. The self-assembled local structures in the solvent ionic liquids are likely to serve as templates of highly organized nano-structured polymers. The length of the alkyl chain in ionic liquids seems to affect these local structures.

DESIGN OF ION CONDUCTIVE POLYMERS BASED ON IONIC LIQUIDS

  • Ohno, Hiroyuki
    • Proceedings of the Polymer Society of Korea Conference
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    • pp.123-124
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    • 2006
  • Ionic liquids (ILs) are collecting keen interests as an advanced substituent of electrolyte solution as well as novel solvents. In the present talk, I will introduce some strategies to fix IL structure on polymer chains to prepare polar polymers with low glass transition temperature. Namely, cationic, anionic, and zwitterionic monomers have been prepared, and they have been homopolymerized or copolymerized to prepare polymer electrolytes with different properties. The polymers themselves showed very poor ionic conductivity, but it was improved by suitable spacer between charged site and main chain. Other unique characteristics of functional ILs and new polymerized ionic liquids will also be mentioned.

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Preparation and Characterization of Porous CeO2 Using Ionic Liquids (이온성액체를 이용한 다공성 산화세륨 합성)

  • Yoo, Kye Sang;Lee, Bu Ho
    • Applied Chemistry for Engineering
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    • v.20 no.3
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    • pp.313-316
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    • 2009
  • Synthesis of porous $CeO_2$ particles was investigated using various ionic liquids (ILs) as an effective template. The pore structure and crystalline phase of $CeO_2$ particles was affected significantly by the composition of ionic liquids. The strength of the hydrogen bonds on the anion part of ionic liquid was an essential factor to form the pore architecture of $CeO_2$ particles. Moreover, the length of alkyl group on the cation part of ionic liquid determined the pore size and surface area of $CeO_2$ particles. Among the ionic liquids, it was found that 1-Buthyl-3-methylimidazolium hexafluorophosphate ([Bmim][PF6]) was the most effective ionic liquid to synthesize the porous $CeO_2$ particle.

Effects of Structural Difference of Ionic Liquids on the Catalysis of Horseradish Peroxidase

  • Hong, Eun-Sik;Park, Jung-Hee;Yoo, Ik-Keun;Ryu, Keun-Garp
    • Journal of Microbiology and Biotechnology
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    • v.19 no.7
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    • pp.713-717
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    • 2009
  • The dependence of the catalytic properties of horseradish peroxidase on the structural changes of ionic liquids was investigated with two water-miscible ionic liquids, N-butyl-3methypyridinium tetraftuoroborate ([$BMP_y$][$BF_4$]) and 1-butyl-3-methylimidazolium methylsulfate ([BMIM][$MeSO_4$]), each of which shares an anion ($BF_4^-$) or a cation ($BMIM^+$) with 1-butyl-3-methylimidazolium tetraftuoroborate ([BMIM][$BF_4$]), respectively. The oxidation of guaiacol (2-methoxyphenol) with $H_2O_2$was used as a model reaction. In order to minimize the effect of solution viscosity on the kinetic constants of the enzymatic catalysis, the enzymatic reactions for the kinetic study were performed in water-ionic liquid mixtures containing 25% (v/v) ionic liquid at maximum. Similarly to the previously reported results for [BMIM][$BF_4$], as the concentration of [$BMP_y$][$BF_4$] increased, the $K_m$value increased with a decrease in the $k_{cat}$value: the $K_m$value increased markedly from 2.8 mM in 100% water to 12.6 mM in 25% (v/v) ionic liquid, indicating that ionic liquid significantly weakens the binding affinity of guaiacol to the enzyme. On the contrary, [BMIM][$MeSO_4$] decreased the Km value to 1.4 mM in 25% (v/v) ionic liquid. [BMIM][$MeSO_4$] also decreased $k_{cat}$more than 3-folds [from 13.8 $s^{-1}$in 100% water to 4.1 $s^{-1}$in 25% (v/v) ionic liquid]. These results indicate that the ionic liquids interact with the enzyme at the molecular level as well as at a macroscopic thermodynamic scale. Specifically, the anionic component of the ionic liquids influenced the catalysis of horseradish peroxidase in different ways.

Influence of Cation Part of Ionic Liquids on Silver Particle Structure (이온성액체의 양이온이 은 입자 구조 형성에 미치는 영향)

  • Yun, Mi Hee;Yoo, Kye Sang
    • Applied Chemistry for Engineering
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    • v.27 no.5
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    • pp.551-554
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    • 2016
  • Silver particles were synthesized by chemical reduction with ionic liquids. Structure of silver particles were significantly affected by the cation parts of the ionic liquids. With increasing the length of the cation part, the smaller silver particles were formed regardless of the anion type. This is mainly attributed to the different stability of the ionic liquid structure formed by physical bond between cation parts. Among seven ionic liquids, [Omim][$PF_6$] was the most effective for synthesizing silver particles.