Effects of Shape and Charged Conditions of a Particle on Its Diffusiophoretic Behavior
Date Issued
2010
Date
2010
Author(s)
Luu, Xuan-Cuong
Abstract
The influences of a boundary, shape and charged condition of a particle on its diffusiophoretic velocity are investigated theoretically by considering the diffusiophoresis of an ellipsoidal particle and nonuniformly charged spherical particle under various conditions of double layer thickness and charged conditions. We shows that the polarization of the double layer around the particle, which is the driving force while a particle immersed in an infinite solution, is strongly affected by the shape of the particle. In addition, if a particle is heterogeneously charged, the double layer on each part of the particle is polarized and affected on the its other parts, making the diffusiophoretic behavior complicated. Together with the polarization of double layer, the accumulation of the ions comes from the hindrance of the particle and the interaction between the ions and the particle when they diffuse from the high-concentration side to the low-concentration side coming from the presence of the boundary also play a important role. Moreover, he background electrophoresis generating from the difference in ionic diffusivities also contribute to the diffusiophoretic driving force. In these ends, the presence of a boundary, shape and charged condition of a particle have a profound influence on its diffusiophoretic behavior.
Subjects
Diffusiophoresis
boundary effect
ellipsoid along a cylindrical pore
double layer polarization
electrophoresis effect
nonuniformly charged sphere
Type
thesis
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