• Title, Summary, Keyword: magnetic beads

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기능성기를 지닌 고분자 자성체를 이용한 수용액 중 납이온 추출

  • 서형석;최규찬;나인욱;황경엽
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • pp.175-176
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    • 2004
  • To develope of efficient method for decontaminating of lead ions from industrial wastewater, treatment of aqueous lead solution with magnetic beads was investigated. Immobilization of carboxyl groups on tile surface of magnetic beads was carried out to introduce chelate effect between lead ions and beads. Experiments were performed with lead solutions and magnetic beads at pH 6. Lead ions were extracted during 1 hour, After extraction, magnetic beads were separated from water by outer magnetic force and the solution was analysed by atomic absorption spectroscopy (AAS). Over 90 % of lead ions could be removed from aqueous solution after beads application. This result indicate that magnetic beads can be used as a efficient method for removing lead ions from industrial wastewater.

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Magnetic beads separation using a multi-layered microfluidic channel (다층구조의 미세유체채널을 이용한 자성입자 분리)

  • Lee, Hye-Lyn;Song, Suk-Heung;Jung, Hyo-Il
    • Proceedings of the KSME Conference
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    • pp.1685-1686
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    • 2008
  • This paper presents the design and experiment results of a multi-layered microsystem for magnetic bead applications. The magneto-microfluidic device is designed for capable of separating magnetic beads. In the presence of the magnetic field, magnetic beads are attracted and moved to high gradient magnetic fields. A multi-layered microfluidic channel consists of top and bottom layers in order to separate magnetic beads in the vertical direction. Our channel is easily integrated magnetic cell sorter, especially on-chip microelectromagnet or permanent magnet device. Fast separation of magnetic beads in top and bottom channels can be used in high throughput screening to monitor the efficiency of blood and drug compounds.

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Availability of Carboxylated Magnetic Beads for Extracting Heavy Metals from Aqueous Solution

  • So, Hyung-Suk;Yoo, Yeong-Seok;Schaeffer Andreas
    • Journal of Magnetics
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    • v.11 no.2
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    • pp.98-102
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    • 2006
  • It was examined in this study that magnetic beads, which are assumed to be environmentally functional, could be effective in processing heavy metals that are water pollutants. For the purpose, magnetic beads containing carboxyl groups, which has strong binding force with heavy metals, are mixed with each Cd, Pb, Ni, Cu and Cr(III) solution, then stirred in pH 6. As a results of the process, it was proven that heavy metals bind quickly with magnetic beads through the reaction. In order to analyze heavy metal concentration, magnetic beads bind with heavy metal were collected by external magnetic force and dissolved in acid. The graphite furnace AAS was used to get heavy metal concentration melted in the acid solution. The results showed that heavy metal extractions by magnetic beads were influenced by the type and the concentration of a heavy metal, and over 90% of a heavy metal can be extracted in ppm level save for Cr(III). It was also examined in the study whether heavy metal extraction is influenced when other ions exist in each heavy metal solution. According to experiment, adding other heavy metals to a solution did have little influence on extracting an intended heavy metal. But in case salt or heavy metal chelate was added, Ni extraction changed sensitively although extracting other heavy metals were influenced only when the concentration of an added substance is high. In conclusion, it was shown that magnetic beads could be used to treat wastewater with relatively high heavy metal concentration.

Analysis of Mobile Lead in Soil Using Carboxylated Magnetic Particle

  • So, Hyung-Suk;Shin, Hyun-Chul;Yoo, Yeong-Seok;Schaeffer Andreas
    • Journal of Magnetics
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    • v.10 no.3
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    • pp.89-92
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    • 2005
  • The analytic possibility of mobile lead contained in soil has been studied using carboxylated magnetic beads. Extraction of heavy metal was performed to contaminated soil that has been collected and supplied for tests. As experiment materials, soil sample, distilled water and magnetic beads were only used. It means that the lead was extracted under neutral condition. In this condition, only the mobile fraction of lead could be extracted by magnetic beads. The mobile lead in the soil was quickly combined with magnetic beads in the mixture process. Then, the magnetic beads were dissolved into acids after collection by external magnetic force, and the lead combined with the beads was eluted and analyzed by Graphite Furnace Atomic Absorption Spectroscopy (GFAAS). In the results of extraction experiments for 3 sandy soils, the efficiency using beads was similar to or higher than that of EDTA (Ethylendiamintetraacetic acid), which is normally used for analyzing mobile heavy metal concentration in soil. With this, it was shown that this method is a more accurate and simple method to analyze mobile lead when analyzing mobile heavy metal concentration in sandy soil, rather than conventional method using EDTA.

Separation Between Soil Particles and Magnetic Beads by Magnetic Force (자력을 이용한 토양입자와 마이크로자성체의 분리 연구)

  • So, Hyung-Suk;Shin, Hyun-Chul;Yoo, Yeong-Seok
    • Journal of the Korean Magnetics Society
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    • v.15 no.2
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    • pp.76-80
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    • 2005
  • It was evaluated whether magnetic beads able to add the functionality of environment purification can be employed in processing soil pollutants. In this study, the micro scale magnetic beads containing carboxyl groups were mixed with water and the soil $(<0.025{\cal}mm) filtered through a sieve, and then it was agitated before isolating the magnetic substances by the use of outer magnetic force. The factors considered at this step were the ratio of soil to magnetic beads, ratio of soil to water, size of the tube where the reaction occur, and intensity of the magnetic force. From the separation experiment between soil and magnetic beads, it was concluded that the magnetic beads and water quantity have an impact on the degree of separation, yet the size of the tube and magnetic force does not have a considerable effect upon that in this small-scaled experiment. Through this experiment, the reaction conditions were optimized to achieve $90\~100\%$ of separation. Therefore, it was concluded that when the functionalized magnetic beads is introduced to environmental processing, it is able to be adopted to the soil processing as well as the water processing.

Detection Property of Red Blood Cell-Magnetic Beads Using Micro Coil-Channel and GMR-SV Device

  • Park, Ji-Soo;Kim, Nu-Ri;Jung, Hyun-Jun;Khajidmaa, Purevdorj;Bolormaa, Munkhbat;Lee, Sang-Suk
    • Proceedings of the Korean Magnestics Society Conference
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    • pp.161-163
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    • 2015
  • The micro device, coil, and channel for the biosensor integrated with the GMR-SV device based on the antiferromagnetic IrMn layer was fabricated by the light lithography process. When RBCs coupled with several magnetic beads with a diameter of $1{\mu}m$ passed on the micro channel, the movement of RBC + ${\mu}Beads$ is controlled by the electrical AC input signal. The RBC + ${\mu}Beads$ having a micro-magnetic field captured above the GMR-SV device is changed as the output signals for detection status. From these results, the GMR-SV device having the width magnitude of a few micron size can be applied as the biosensor for the analysis of a new magnetic property as the membrane's deformation of RBC coupled to magnetic beads.

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Application Status and Prospect of Magnetic Separation Technology for Wastewater Treatment (폐수처리 분야에서 자기 분리기술의 응용 현황 및 전망)

  • Chu, Shaoxiong;Lim, Bongsu;Choi, Chansoo
    • Journal of Korean Society on Water Environment
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    • v.36 no.2
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    • pp.153-163
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    • 2020
  • Magnetic separation technology is an efficient and environmentally friendly technology. Compared with the traditional wastewater treatment technology, the magnetic separation technology has its unique advantages and characteristics, and has been widely applied in the field of wastewater treatment. In particular, the emergence of superconducting magnetic separation technology makes possible for high application potential and value. In this paper, which through consulting with the literatures of Korea, Chinese, United States and other countries, the magnetic separation technology applied to wastewater treatment was mainly divided into direct application of magnetic field, flocculation, adsorption, catalysis and separation coupling technology. Advantages and limitations of the magnetic separation technology in sewage treatment and its future development were also studied. Currently, magnetic separation technology needs to be studied for additional improvement in processing mechanism, design optimization of magnetic carrier and magnetic separator, and overcoming engineering application lag. The selection, optimization and manufacturing of cheap magnetic beads, highly adsorbed and easily desorbed magnetic beads, specific magnetic beads, nanocomposite magnetic beads and the research of magnetic beads recovery technology will be hot application of the magnetic separation technology based on the magnetic carriers in wastewater treatment. In order to further reduce the investment and operation costs and to promote the application of engineering, it is necessary to strengthen the research and development of high field strength using inexpensive and energy-saving magnet materials, specifically through design and development of new high efficiency magnetic separators/filters, magnetic separators and superconducting magnetic separators.

Analysis of Mobile Cadmium from Soils with Functionalized Magnetic Beads (기능성 자성입자를 이용할 토양의 유동성 카드뮴 분석)

  • So Hyungsuk;Nah In-Wook;Hwang Kyung-Yub;Shin Hyun Chul;Kim Beom-Suk;Yoo Yeong-Seok
    • Journal of Soil and Groundwater Environment
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    • v.10 no.1
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    • pp.13-17
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    • 2005
  • Potential for measuring mobile cadmium concentration in sandy soil using polymer magnetic beads with carboxyl groups was investigated. Experiments for extracting cadmium were performed with contaminated soils, de-ionized water and magnetic beads. In this neutral experimental condition, reacting cadmium with magnetic beads indicate total amount of cadmium that can be moved in soil. The results showed that the mobile fraction of cadmium in soil could be combined with magnetic beads in short time. After binding between cadmium and magnetic beads, the beads were separated from soil suspension by outer magnetic force. The bound cadmium was dissolved from magnetic beads by acid solutions, which were then analyzed by atomic absorption spectroscopy (AAS). This method can determine mobile heavy metals in sandy soil effectively than existing method which use pollutant chemicals to environments such as EDTA.

Fabrication and Performance Evaluation of a Micro Separation Chip of Magnetic Beads Using Magnetophoretic Flow (자기영동을 이용한 자성입자 분리 마이크로 칩 제작 및 성능평가)

  • Go, Jeung-Sang
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.31 no.4
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    • pp.392-397
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    • 2007
  • We developed a microfluidic platform able to control the trap and release of magnetic beads used for separation of a specific biomolecules. The magnetic beads can be trapped and released conditionally by controlling the difference between the Stokes force induced by the fluid flow and magnetic force resulting from a permanent magnet. The permanent magnet of CoNiP alloy is electroplated. It is characterized to have the 1369 Oe of coercivity, 1762 Gauss of remanence, and 0.603MGOe of (BH)max. Through the experimental and numerical investigation, the magnetic beads are trapped under the flow velocity of 17 ${\mu}m/s$ and are released perfectly above the velocity of 174 ${\mu}m/s$.

Micro Pre-concentration and Separation of Metal Ions Using Microchip Column Packed with Magnetic Particles Immobilized by Aminobenzyl Ethylenediaminetetraacetic Acid

  • Kim, Y.H.;Kim, G.Y.;Lim, H.B.
    • Bulletin of the Korean Chemical Society
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    • v.31 no.4
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    • pp.905-909
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    • 2010
  • Magnetic beads (Dynabeads$^{(R)}$) embedded in ~1 micron size polystyrene beads bearing surface carboxylic acid groups were modified with aminobenzyl ethylenediaminetetraacetic acid (ABEDTA) to concentrate or separate metal ions using pH gradients on micro and nano scales. The immobilization of ABEDTA was achieved by amide formation. The presence of the metal chelating functional group in the fully deprotonated form was confirmed by FT-IR. The chelation efficiency of beads was tested by determining metal ions in supernatant using GFAAS when pH gradients from 3 to 7. Mixtures of Cu and Mg and of Cd and Mn (at 10 ng/mL of metal) were separated as the difference in formation constant with the functional group of ABEDTA. The separation was repeated twice with relative standard deviation of <18%. A polydimethylsiloxane (PDMS) microchip column packed with EDTA-coated magnetic beads was optimized to concentrate metal ion for practical applications by eluting a Cu solution of micro scale at pH 3.