• Title, Summary, Keyword: Electrokinetic potential

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Fundamental Studies on the Characteristics of the Surface Electrokinetic Behavior of Particulate Matter as an Extensive Property (입자성 물질의 크기성질로서의 표면 전기적 특성 규명에 대한 기초연구)

  • O, Se-Jin;Kim, Dong-Su
    • Journal of Korean Society of Environmental Engineers
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    • v.32 no.6
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    • pp.581-586
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    • 2010
  • Generally, electrokinetic potential has been considered as an intensive property. In other words, electrokinetic potential is not affected by the amount of particulate matter. Montmorillonite, one of essential inorganic matter, was chosen to measure electrokinetic potential. The result of electrokinetic potential measuring experiment showed that the value observed to decrease as the amount of montmorillonite clay increased. This is due to the fact that total ions that adsorbed per unit mass were decreased as the amount of montmorillonite was increased. As a result, electrokinetic potential is considered as an extensive property. By using these results, total interaction energy of suspension was also checked, and revealed that total interaction energy was decreased as the amount of montmorillonite increased.

The Influence of Temperature on the Surface Electrokinetic Features of Particulate Matters in Aqueous Environment (수중입자의 표면 전기적 특성에 미치는 온도의 영향)

  • O, Sejin;Kim, Dong-Su
    • Journal of Korean Society on Water Environment
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    • v.26 no.3
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    • pp.525-531
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    • 2010
  • To figure out the importance of temperature on electrochemical properties in water environment, calcium carbonate, one of important substances in water chemistry, was chosen to make suspensions. The result of electrokinetic potential of calcium carbonate suspensions revealed that it tended to increase as temperature increased. In addition, electrokinetic potential was negatively increased as suspensions became more basic. Its isoelectric point was ca. 7 regardless of temperature. The adsorption of hydrogen ions on calcium carbonate particles followed endothermic reaction. This result was verified by continuously measuring pH as adding HCl solution in calcium carbonate suspension. It explained that suspensions' potential was determined by DLVO theory which calculated total interaction energy between particles. Suspensions' total interaction energy was proportional to the value of electrokinetic potential. Furthermore, total interaction energy between particles increased as suspensions' temperature was increased.

Interfacial Electrokinetic Potential and Dyeing Properties of Wool and Acrylic Fiber in Acid/cationic Mixed Dye Solution (I) Interfacial Electrokinetic Potential of Wool and Acrylic Fiber in Acid, Cationic Dye Solution (산성/캐티온 혼합염료 용액에서의 양모 및 아크릴 섬유의 계면동전위와 염색성 (I) -산성, 캐티온 염액에서 양모 및 아크릴 섬유의 계면동전위)

  • 김삼수;김노수
    • Textile Science and Engineering
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    • v.28 no.8
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    • pp.61-69
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    • 1991
  • In dyebath of acid and cationic dye solution, the effects of pH, dye concentration and dyeing temperature on dyeing properties were investigated by the measurement of the interfacial electrokinetic potential of wool and acrylic fiber. The interfacial electrokinetic potentials were measured by streaming potential method which was generally used in the electrochemical study of interface of fiber and dye solution. The results were transformed into potential by Helmholtz-Smoluchowski formular, into surface charge density by Suzawa formular and into surface dye adsorption of fibers. The f potential of wool in dyebath of acid dye was decreased by the formation of ionic bonding between positively charged wool and acid dye. The f potential of acrylic fiber in dyebath of cationic dye was increased by the formation of ionic bonding between negatively charged acrylic fiber and cationic dye.

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Characteristics of the Turbidity Change of Clay Particulate Matter according to Its Surface Electrokinetic Behavior (점토성 광물입자의 표면 전기적 거동에 따른 탁도 변화 특성)

  • O, Sejin;Kim, Dong-Su
    • Journal of Korean Society on Water Environment
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    • v.26 no.2
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    • pp.326-331
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    • 2010
  • Montmorillonite is one of representative inorganic clay particles. As the characteristics of clay particulate matter in aqueous environment determine the efficiencies of wastewater treatment and some industrial operations, it is essential to understand its aquatic behavior in relation with turbidity. The change of electrokinetic potential of montmorillonite suspension shows that it tends to negatively increase as the pH of suspension increases. In addition, it is observed that its potential is around 0mV when the solution pH is ca. 5. The turbidity of suspension is shown to be very low when pH is lower than its isoelectric point. However, the turbidity gradually enhances according to beyond isoelectric point. These results reveal that the correlation between electrokinetic potential and turbidity for clay mineral suspension is peculiar which should be fundamentally considered for systematic treatment of wastewater.

Electrokinetic streaming potential detection in a triangular-shaped microchannel (역삼각형 모양을 갖는 마이크로 채널에서의 전기역학적 흐름전위 검출)

  • Jo, Seong-Sik;Park, Je-Kyun
    • Journal of Sensor Science and Technology
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    • v.16 no.2
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    • pp.115-119
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    • 2007
  • We report electrokinetic streaming potential detection in a microchannel. Streaming potential, one of the representative electrokinetic phenomena, becomes noticeable either when the channel size reduces or when the concentration of electrolyte reduces. We suggest a triangular-shaped microchannel to enhance streaming potential. The triangular-shaped microchannel shows better performance than the straight one in terms of streaming potential. Couple of possible methods to enhance streaming potential is also discussed. Moreover, this type of channel and phenomenon can be applied to biological sensor application and energy transduction.

Modeling of Electrical and Chemical Characteristics During the Electro]kinetic Remediation of Contaminated Soil by Heavy Metal (중금속 오염토의 Electrokinetic 정화시 토체의 전기화학적 특성의 모델링)

  • 한상재;김수삼;조용실
    • Journal of the Korean Geotechnical Society
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    • v.18 no.1
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    • pp.49-57
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    • 2002
  • During the electrokinetic remediation, direct current applied to a soil-water-electrolyte system derives the variations of fluid transport phenomena in soil-water system and soil-water interface characteristics. Therefore, these variations affect the electrokinetic reaction. In this study, lab-scale electrokinetic remediation tests were performed to characterize the electrical and chemical parameters variation in soil. During the test, voltage gradient, electrical current, zeta potential and pH variations were measured. On the basis of experimental results, computer modeling techniques predicting the variations of these parameters are suggested.

Interfacial Electrokinetic Potential and Dyeing Properties of Wool and Acrylic Fiber in Acid/Cationic Mixed Dye Solution (III) -Interfacial Electrokinetic Potential of Wool and Acrylic Fiber in Mixed Dye Solution- (산성/캐티온 혼합염료 용액에서의 양모 및 아크릴 섬유의 계면동전위와 염색성(III) -혼합염료 염액에서 양모 및 아크릴 섬유의 계면동전위-)

  • 김삼수;김성동;김노수;고석원
    • Textile Science and Engineering
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    • v.29 no.9
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    • pp.50-59
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    • 1992
  • The interfacial electrokinetic potentials were measured by streaming potential method which was generally used in the electrochemical study of interface of fiber and dye solution. The results were transformed into ζ potential by Helmholtz-Smoluchowski formular, into surface charge density by Suzawa formular and into surface dye adsorption of fibers. The ζ potential of wool or acrylic fiber in dye mixture solution showed similar trend as was found in single dye solution, but the total dye up-take of wool fiber increased at higher pH value. It is postulated that the increase in dyeing sites by the dissociation of carboxyl groups of wool fiber at higher pH is responsible for the increased dye up-take.

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The Effect of Inorganic Electrolyte on the Electrokinetic Features of Calcium Carbonate Particles in Aqueous Environment (수중 탄산칼슘 입자의 전기적 거동에 미치는 무기염류의 영향)

  • O, Se-Jin;Choi, Eun-Jin;Kim, Dong-Su
    • Journal of Korean Society on Water Environment
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    • v.26 no.1
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    • pp.89-95
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    • 2010
  • The electrokinetic potential of $CaCO_3$, which takes an important part in aquatic system, has been measured and the variation of total energy between $CaCO_3$ particles with the distance of particles was estimated based on DLVO theory. The electrokinetic potential of particles was observed to increase to positive direction as the charge valence of cations which was added to suspension was increased. Also, the total interaction energy between particles was estimated to be more negative as the charge valence of cation was higher and its concentrations was raised. When a mixture of cations with different charge valences was added, the influence of cation with a higher charge valence was more significant on the total interaction energy between particles. When anion was added to the suspension of $CaCO_3$, the total energy estimated by DLVO theory was examined to move to positive direction and the electrokinetic potential of particles became more negative. Likewise cations, the effect of anions on the electrokinetic potential of particles and total interaction energy between them was observed to be proportional to their charge valence and the influence of the mixture of anions with different charge valence became more remarkable as the mixing ratio of the anion with a higher charge valence was increased.

Electrokinetic flow and electroviscous effect in a charged slit-like microfluidic channel with nonlinear Poisson-Boltzmann field

  • Chun, Myung-Suk;Kwak, Hyun-Wook
    • Korea-Australia Rheology Journal
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    • v.15 no.2
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    • pp.83-90
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    • 2003
  • In cases of the microfluidic channel, the electrokinetic influence on the transport behavior can be found. The externally applied body force originated from the electrostatic interaction between the nonlinear Poisson-Boltzmann field and the flow-induced electrical field is applied in the equation of motion. The electrostatic potential profile is computed a priori by applying the finite difference scheme, and an analytical solution to the Navier-Stokes equation of motion for slit-like microchannel is obtained via the Green's function. An explicit analytical expression for the induced electrokinetic potential is derived as functions of relevant physicochemical parameters. The effects of the electric double layer, the zeta potential of the solid surface, and the charge condition of the channel wall on the velocity profile as well as the electroviscous behavior are examined. With increases in either electric double layer or zeta potential, the average fluid velocity in the channel of same charge is entirely reduced, whereas the electroviscous effect becomes stronger. We observed an opposite behavior in the channel of opposite charge, where the attractive electrostatic interactions are presented.

WASHING-ELECTROKINETIC DECONTAMINATION FOR CONCRETE CONTAMINATED WITH COBALT AND CESIUM

  • Kim, Gye-Nam;Yang, Byeong-Il;Choi, Wang-Kyu;Lee, Kune-Woo;Hyeon, Jay-Hyeok
    • Nuclear Engineering and Technology
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    • v.41 no.8
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    • pp.1079-1086
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    • 2009
  • A great volume of radioactive concrete is generated during the operation and the decommissioning of nuclear facilities. The washing-electrokinetic technology in this study, which combined an electrokinetic method and a washing method, was developed to decontaminate the concrete generated in nuclear facilities. The results of only an electrokinetic decontamination for the concrete showed that cobalt was removed to below 1% from the concrete due to its high pH. Therefore, the washing-electrokinetic technology was applied to lower the pH of the concrete. Namely, when the concrete was washed with 3 M of hydrochloric acid for 4 hours (0.17 day), the $CaCO_3$ in the concrete was decomposed into $CO_2$ and the pH of the concrete was reduced to 3.7, and the cobalt and cesium in the concrete were removed by up to 85.0% and 76.3% respectively. Next, when the washed concrete was decontaminated by the electrokinetic method with 0.01M of acetic acid in the 1L electrokinetic equipment for 14.83 days, the cobalt and the cesium in the concrete were both removed by up to 99.7% and 99.6% respectively. The removal efficiencies of the cobalt and cesium by 0.01M of acetic acid were increased more than those by 0.05M of acetic acid due to the increase of the concrete zeta potential. The total effluent volume generated from the washing-electrokinetic decontamination was 11.55L (7.2ml/g).