• 대한환경공학회지
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• 제32권6호
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• pp.581-586
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• 2010

일반적으로 전기 동역학적 전위는 세기성질로 알려져 있으며 이를 바탕으로 연구들이 진행되어 왔다. 본 연구에서는 대표적 무기성 물질인 몬모릴로나이트를 대상으로 하여 분산체를 제조해 전위를 측정하였다. 전기 동역학적 전위를 측정한 결과, 몬모릴로나이트의 질량이 증가할수록 전위값이 감소하는 경향을 나타내었다. 이는 몬모릴로나이트의 질량이 증가하면서 단위질량당 흡착하는 이온의 양이 적어지기 때문이라고 사료된다. 이러한 결과는 전위가 세기성질이 아닌 크기성질을 따른다고 생각할 수 있다. 또한 측정한 전기 동역학적 전위값을 통해 입자간 상호 에너지를 측정한 결과 몬모릴로나이트의 질량이 증가할수록 상호 입자간 에너지가 점차적으로 감소하는 경향이 관찰되었다.

• 한국물환경학회지
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• 제26권3호
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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.

• 한국물환경학회지
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• 제26권2호
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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.

• 센서학회지
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• 제16권2호
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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.

• 한국지반공학회논문집
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• 제18권1호
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• pp.49-57
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• 2002

오염지반 정화를 위한 Electrokinetic 처리 과정에서 지반에 전류를 적용하면 흙물 시스템 내에서 발생하는 유체의 이동 현상과 계면의 특성 변화가 발생하여 Electrokinetic 반응에 영향을 미친다. 본 논문에서는 지반 내에서 발생하는 전기적, 화학적 변수와 그 변화 특성을 규명하고자 실내실험을 수행하여, 시료의 전압, 전류, 제타포텐셜, pH등의 전기 화학적 현상을 연구하였으며 이러한 인자들의 특성변화를 모델링하는 기법을 제시하였다. 그 결과 정화 도중 전압, 전류 변화를 각 농도에서 시간에 따른 지수함수로 표현할 수 있었으며 제타포텐셜의 변화를 pH와 오염농도에 따라 모델링 할 수 있었다.

• 한국물환경학회지
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• 제26권1호
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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.

• Korea-Australia Rheology Journal
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• 제15권2호
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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.

• 한국염색가공학회지
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• 제15권4호
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• pp.1-7
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• 2003

We investigated the effect of color depth on polyester fabrics by plasma treatment. In this study, although it have many paper about effects of plasma treatment, we observed interfacial electrokinetic potential of polyester fabrics by plasma treatment and also we investigated relationship between deep coloring agent and plasma treatment to get the effect of color depth on polyester fabrics. The results obtained are as follows, 1. Plasma treatment did not enhanced the effect of color depth of polyester fabrics by plasma treatment independently. 2. In the case of using the deep coloring agent with plasma treatment on polyester fabrics, lightness was more decreased than using the deep coloring agent itself. 3. Plasma treatment could not affect surface shape and tensile strength of treated polyester fabrics.

• 대한환경공학회지
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• 제22권12호
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• pp.2227-2238
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• 2000

수중 부유입자의 효과적인 제거 방안을 모색하고자 $CaCO_3$로 구성된 부유물의 계면화학적 특성을 고찰하였다. pH에 따른 전기영동도 측정에서는 수중 $OH^-$의 작용으로 pH가 상승함에 따라 electrokinetic potential은 음의 방향으로 변환하는 것으로 나타났다. 계면활성제는 부유물의 안정성에 영향을 끼치는 바, 계면활성제의 농도 및 전하에 따라 영향을 미치는 양상이 다르게 나타났다. 무기응집제의 경우에 있어서도 그 전하가 및 농도에 따라 부유물의 계면화학적 거동이 달라졌으며 이는 DLVO 이론에 의거하여 작성된 potential energy의 변화추이와 관련하여 이론적으로 해석될 수 있었다. Non-specific adsorption은 전기이중층의 압축을 초래하여 electrokinetic potential의 절대값 감소를 야기시켰으며 specific adsorption은 부유입자의 IEP 및 PZC가 상호 반대방향으로 이동하는 결과를 나타내었다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2003년도 총회 및 춘계학술발표회
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• pp.306-309
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• 2003

Surfactant-enhanced electrokinetic (EK) remediation is an emerging technology that can effectively remove hydrocarbons from low-permeability soils. In this study, the electrokinetic remediation using Calfax 16L-35 was conducted for the removal of phenanthrene from kaolinite. An anionic surfactant Calfax 16L-35 was used at concentrations of 5, 15, and 30g/L to enhance the solubility of phenanthrene. When the surfactant solution was applied to EK system, low electrical potential gradient was maintained because of its ions. Even when the surfactant concentration was high, the removal efficiency of phenanthrene was low After the operation, most of surfactants were remained in soil and there were few in effluent. This phenomena was observed because the migration of Calfax 16L-35 from cathode to anode was predominant over electroosmotic flow which moved in opposite direction. Therefore, the anionic surfactant Calfax 16L-35 is considered to be improper in surfactant - enhanced electrokinetic remediation.