Frequency domain electric birefringence study of water-in-oil microemulsion droplets

Shimomura, Takeshi; Ito, Kohzo

doi:10.1016/s0927-7757(02)00190-5

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…Therefore, the changes would affect the distribution between water and microemulsion phase for analytes, so as to influence the m eff measurement. There have been some reports about effects of electric field on microemulsion systems [24][25][26][27][28]. We have found the phenomenon that the properties of microemulsions would be affected by a high electric field, which would affect the m eff measurement.…”

Section: Introductionmentioning

confidence: 85%

Improvement of microemulsion electrokinetic chromatography for measuring octanol–water partition coefficients

Xia

Jiang

et al. 2008

Electrophoresis

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Microemulsion electrokinetic chromatography (MEEKC) has been used to indirectly measure octanol-water partition coefficients (log P(ow)) of compounds. In order to obtain an accurate log P(ow) value, the electrophoretic mobilities of the microemulsion phase (mu(me)) and the analyte (mu(eff)) in MEEKC must be accurately required. However, in conventional MEEKC, the shortage of obtaining mu(me) with a tracing method was discovered, and the influences of concentration, injection volume of analyte, and high electric field on measuring mu(eff) were also found. In this paper, a novel method called improved MEEKC (I-MEEKC) was developed to avoid the problems mentioned above. In I-MEEKC, a nonlinearity fitting program was used to obtain mu(me) to avoid the error from tracing mu(me); the extrapolating method was used to eliminate the effects of concentrations and injection volumes of analytes on mu(eff) measurement, and an enough stable microemulsion was selected to eliminate the effect of high electric field on mu(eff )measurement. Then the novel method was applied to estimate log P(ow) of uncharged compounds and charged pharmaceuticals compared to the conventional MEEKC. The log P(ow) of all analytes obtained by I-MEEKC agreed with those obtained by classical shake flask or literature values, the errors between them were within 0.1 logarithm units, better than the ones by conventional MEEKC.

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Section: Introductionmentioning

confidence: 85%

Improvement of microemulsion electrokinetic chromatography for measuring octanol–water partition coefficients

Xia

Jiang

et al. 2008

Electrophoresis

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“…It was demonstrated that the electric deformation of droplets is proportional to −1 (Edwards et al, 1991;Shimomura and Ito, 2002).…”

Section: Mechanisms Of Droplet Deformation and Breakage Influenced Bymentioning

confidence: 99%

Effect of surfactants on the deformation and break-up of an aqueous drop in oils under high electric field strengths

Zhang

Ghadiri

et al. 2015

Journal of Petroleum Science and Engineering

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Abstract:Understanding the deformation and break-up of drops is of great significance in various applications such as emulsification and phase separation. Most practical systems contain surface-active agents that are present as impurities affecting the properties of the system, e.g. modifying the rigidity of the film that affects emulsion stability. In this paper, the effect of surfactants on the deformation and break-up of an aqueous drop in an immiscible dielectric oil under the action of an electric field is addressed. The experiments were carried out on a single drop in a microscopic cell under an applied external electric field. A nonionic surfactant, polyethylene glycol sorbitan monolaurate (Tween 20), and an ionic surfactant, sodium dodecyl sulfate (SDS), were used at different concentrations. The drop adopted in most cases a prolate shape. However, the presence of the surfactant affected both the extent of deformation and the modes of break-up. The drop deformation extent increased rapidly with the surfactant concentration, while smaller drops deformed less under the same external electric field strength.When the surfactant concentration was high, the position of break-up could be from both poles along the main axis of the drops in the direction of the electric field.

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“…Droplets are polarised by an external electric field, and the polarised droplets undergo coalescence through collision within a short period of time [10][11][12]. Dipole coalescence and oscillation coalescence effects are believed to exist in pulsed electric fields, and oscillation coalescence is the main factor influencing droplet coalescence [2,13]. To this end, the academic community has conducted 2 International Journal of Chemical Engineering several studies on the dynamics of pulsed electric fields promoting the coalescence of droplets.…”

Section: Introductionmentioning

confidence: 99%

Review of the Dynamics of Coalescence and Demulsification by High-Voltage Pulsed Electric Fields

Peng

Liu

Gong

et al. 2016

International Journal of Chemical Engineering

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The coalescence of droplets in oil can be implemented rapidly by high-voltage pulse electric field, which is an effective demulsification dehydration technological method. At present, it is widely believed that the main reason of pulse electric field promoting droplets coalescence is the dipole coalescence and oscillation coalescence in pulse electric field, and the optimal coalescence pulse electric field parameters exist. Around the above content, the dynamics of high-voltage pulse electric field promoting the coalescence of emulsified droplets is studied by researchers domestically and abroad. By review, the progress of high-voltage pulse electric field demulsification technology can get a better understanding, which has an effect of throwing a sprat to catch a whale on promoting the industrial application.

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Frequency domain electric birefringence study of water-in-oil microemulsion droplets

Cited by 7 publications

References 21 publications

Improvement of microemulsion electrokinetic chromatography for measuring octanol–water partition coefficients

Improvement of microemulsion electrokinetic chromatography for measuring octanol–water partition coefficients

Effect of surfactants on the deformation and break-up of an aqueous drop in oils under high electric field strengths

Review of the Dynamics of Coalescence and Demulsification by High-Voltage Pulsed Electric Fields

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