Electrical Conductivity and Electrokinetic Phenomena of Soft Particle near The Air-Water Interface
Date Issued
2015
Date
2015
Author(s)
Mu, Szu Chi
Abstract
The electrokinetic behavior including electrophoresis of a soft particle normal to air-water interface and conductivity of concentrated suspensions of charged soft particles is investigated. Brinkman model is adopted to simulate the porous structure. A pseudo-spectral method based on Chebyshev polynomials is used to solve the resulted general electrokinetic equations. Instead of the classic hard sphere model, soft particle model may be a better choice in describing bio-particles and polyelectrolytes, which are usually permeable to ions and fluid in its soft layer. In the project “electrophoresis of a soft particle normal to air-water interface”, we found that there is an induced electric field opposite to the applied electric field near the interface, which is because of the deformation of the double layer. And when we compared two diffirent boundary effects of air-water interface and solid plane, we can found that the geometry of the deformation of the double layer is different from air-water interface to solid plane, and in consequence different electrical mobility. In the project “conductivity of concentrated suspensions of charged soft particles”, we found that the relative conductivity is not affect much to the permeability of the soft layer. And the relative conductivity will finally approach 1 when double layer is thin enough, but it is still less than 1 because of the non-conducting solid core.
Subjects
soft particle
electrophroesis
conductivity
air-water interface
boundary effect
Type
thesis
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