• Title/Summary/Keyword: Residual ionic liquid

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Method for Drying of Crude Extract Obtained by Biomass Extraction Using an Ionic Liquid (이온성 액체를 이용한 바이오매스 추출에 의해 얻어진 추출물의 건조 방법)

  • Kim, Seul Ki;Kim, Jin-Hyun
    • Korean Chemical Engineering Research
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    • v.54 no.3
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    • pp.374-379
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    • 2016
  • When using an ionic liquid as co-solvent, the extraction efficiency of anticancer agent paclitaxel from biomass was dramatically improved. However, the residual ionic liquid had a significant negative effect on convenient and feasibility of following concentration and drying steps. In this study, a novel method was developed for the effective drying of the crude extract obtained from biomass extraction with ionic liquid. The residual ionic liquid was easily and conveniently removed by drying alone after pre-treatment and additional washing of a sample with water. The optimal crude extract/water ratio and mixing time for pre-treatment and crude extract/water ratio for additional washing were 1:70 (w/v), 4 min, and 1:100 (w/v), respectively. In the microwave-assisted drying process, the drying time was 9-fold shorter than in the vacuum oven drying process.

Isolation of Mutant Yeast Strains having Resistance to 1-ethyl-3-methylimidazolium Acetate through a Directed Evolutionary Approach (유도적 돌연변이 유발 방법을 통한 1-ethyl-3-methylimidazolium acetate에 대해 내성을 갖는 돌연변이 효모 선별)

  • Lee, Yoo-Jin;Kwon, Deok-Ho;Park, Jae-Bum;Ha, Suk-Jin
    • Microbiology and Biotechnology Letters
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    • v.45 no.1
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    • pp.51-56
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    • 2017
  • Cellulosic biomass is a renewable source for biofuel production from non-edible biomass. An optimized pretreatment process is required for the efficient utilization of cellulosic biomass. Among various pretreatment processes, the use of ionic liquids has been reported recently. However, the residual ionic liquid after pretreatment acts as an inhibitor of microbial fermentation. Recently, we isolated mutant Saccharomyces cerevisiae strains resistant to the ionic liquid 1-ethyl-3-methylimidazolium acetate ([EMIM][Ac]) by using a directed evolutionary approach. When 3% [EMIM][Ac] was added to a medium containing 80 g/l of glucose, mutants D452-B2 and D452-S3 produced 35.6 g/l and 36.3 g/l of ethanol, respectively, for 18 h while the parental strain (S. cerevisiae D452-2) produced 1.3 g/l of ethanol. Thus, these mutant S. cerevisiae strains might prove advantageous when ionic liquids are used for biofuel production from cellulosic biomass.

One-Step Nanoscale Patterning of Silver Ionic Ink via Elastic Mold Deformation (탄성 몰드 변형을 이용한 은 이온 잉크의 원-스텝 나노스케일 패터닝)

  • Yong Suk Oh
    • Journal of Sensor Science and Technology
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    • v.32 no.4
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    • pp.252-256
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    • 2023
  • A one-step method for nanoscale patterning of silver ionic ink on a substrate is developed using a microscale, elastic mold deformation. This method yields unique micro/nanoscale metallic structures that differ from those produced using the original molds. The linewidth of these metallic structures is significantly reduced (approximately 10 times) through the sidewall deformation of the original mold cavity on a thin liquid film, as verified by finite element analysis. The process facilitates the fabrication of various, isolated and complex micro/nanoscale metallic structures with negligible residual layers at low cost and high throughput. These structures can be utilized for various applications, including optoelectronics, wearable sensors, and metaverse-related devices. Our approach offers a promising tool for manipulation and fabrication of micro/nanoscale structures of various functional materials.

Study on Electrical Characteristics of Chloromethylated Polyimide

  • Yu, I.H.;Zhong, Z-X;Lee, M.H.;Lee, S.H.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2005.07a
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    • pp.472-475
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    • 2005
  • The electrical performances of liquid crystal (LC) cells with chloromethylated polyimide (CMPI) alignment layers were investigated. The CMPI layer was previously reported as a multifunctional layer that does role of LC alignment and planarization layer as well as photo-alignment material with high photosensitivity and excellent thermal stability. The capacitance-voltage (C-V) characteristics of LC cells with CMPI alignment layers were measured. Mechanical rubbing of the CMPI layer did not generate much difference in residual DC when compared to commercial PI. However, the LC cell with photo-oxidation CMPI layer shows a high residual DC value and a corresponding low voltage holding ratio (VHR) due to the photo-induced ionic charges on the alignment layer.

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Selective Recovery of Platinum Group Metals by Solvent Extraction and Electrolysis in Non-aqueous Solution Based on Ionic Liquids (이온성액체 기반 비수계 용액에서 용매추출과 전해에 의한 백금족 금속의 분리회수)

  • Park, Gwang-won;Park, Jesik;Lee, Churl Kyoung
    • Resources Recycling
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    • v.28 no.2
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    • pp.46-53
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    • 2019
  • In this study, the extraction and reduction behavior of platinum group metals in a non-aqueous solvent based on ionic liquids was investigated in order to confirm a new extraction technology of platinum group metals. Platinum was selectively extracted using an ionic liquid $[C_4mim]PF_6$ from a mixed solution of $PdCl_2$, $PtCl_4$ and $RhCl_3$ dissolved with concentration ratio of 10:1:0.5 M. After stripping of the metals by 1 M $HNO_3$ solution, the platinum was preferentially reduced by aqueous electrolysis on gold electrode at -0.8 V (vs. Pt-QRE). The residual palladium and rhodium were transferred to ionic liquid of $[C_4mim]Cl$. The metallic palladium and rhodium could be sequentially reduced on gold and STS304 as working electrodes by non-aqueous electrolysis, respectively.

A Study on the Electrometric Measurement of the pH of Acid Rain (산성비의 pH 측정에 대한 연구)

  • Lee, Hwa-Shim;Kim, Myung-Soo
    • Journal of the Korean Chemical Society
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    • v.44 no.1
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    • pp.10-16
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    • 2000
  • In general, acid rain is unbuffered solution with low ionic strength and high resistance. Therefore during the pH measurement of acid rain, error can be occurred due to the liquid junction potential difference between the sample and the standard solution. Actually the average conductivity of rain in Taeduk Science Town during 1998 is 12.8 ${\mu}S/cm$, while that of pH standmd solutions is about 5,980 ${\mu}S/cm$. There is a large difference in ionic strength. To compensate the bias due to residual liquid junction potentials, a quality control standard(QCS) of dilute sulfuric acid, which has the conductivity and pH values simikw to rain, was prepared. The pH of QCS solution was determined using the hydrogen electrode system without liquid junction, and compensation has been made for the bias terms by performing the pH measurements with glass electrode. On the basis of this compensation method, the pH vaiues of rain in Taeduk Science Town during 1998 were measured.

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