Hydrodynamic and Electrokinetic Properties of Decane Droplets in Aqueous Sodium Dodecyl Sulfate Solutions
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- 作者：Sarah A. Nespolo ; Michael A. Bevan ; Derek Y. C. Chan ; Franz Grieser ; and Geoffrey W. Stevens
- 刊名：Langmuir
- 出版年：2001
- 出版时间：November 13, 2001
- 年：2001
- 卷：17
- 期：23
- 页码：7210 - 7218
- 全文大小：142K
- 年卷期：v.17,no.23(November 13, 2001)
- ISSN：1520-5827
文摘
Electrophoretic mobilities of sodium dodecyl sulfate (SDS)-stabilized decane droplets are converted to
-potentials with the aid of light scattering and SDS surface excess measurements. Static light scatteringmeasurements of droplet size and shape in conjunction with dynamic light scattering measurements ofdroplet diffusion are used to determine the droplet hydrodynamic mobility coefficient. For the SDSconcentrations used here between 0.01 and 1 mM SDS, the droplet's mobility coefficient is consistent withthe droplet being a nondeformable, solid, spherical particle with no interfacial momentum transfer. Thedecane droplets display decreasing monodisperse radii with increasing bulk SDS concentration. The percentionization of the SDS, or degree of counterion binding, is considered by comparing the charge correspondingto the measured -potentials with the charge due to the SDS surface excess inferred from interfacialtension data. After the droplet hydrodynamic mobility coefficient and percent ionization of the interfacialSDS are considered, -potentials for the SDS concentrations studied are found to be between -100 and-125 mV.
-potentials with the aid of light scattering and SDS surface excess measurements. Static light scatteringmeasurements of droplet size and shape in conjunction with dynamic light scattering measurements ofdroplet diffusion are used to determine the droplet hydrodynamic mobility coefficient. For the SDSconcentrations used here between 0.01 and 1 mM SDS, the droplet's mobility coefficient is consistent withthe droplet being a nondeformable, solid, spherical particle with no interfacial momentum transfer. Thedecane droplets display decreasing monodisperse radii with increasing bulk SDS concentration. The percentionization of the SDS, or degree of counterion binding, is considered by comparing the charge correspondingto the measured -potentials with the charge due to the SDS surface excess inferred from interfacialtension data. After the droplet hydrodynamic mobility coefficient and percent ionization of the interfacialSDS are considered, -potentials for the SDS concentrations studied are found to be between -100 and-125 mV.