Sedimentation of a Soft Particle in a Spherical Cavity
Date Issued
2004
Date
2004
Author(s)
Huang, Tzu-Hao
DOI
zh-TW
Abstract
In this study, sedimentation of a soft particle in a spherical cavity is investigated. Due to its particular structure, soft-particle systems can be used to depict biological cells and polymers appropriately for widely application. These non-linear hydrodynamic, electrical potential and ion-conservation equations are coupled. After some assumptions, these equations are linearized and calculated by pseudo-spectral method simultaneously.
If the fixed charges in the ion-penetrable layer (Qfix) are positive, the sedimentation will be retarded； if there are negative charges in the ion-penetrable layer, the sedimentation velocity will be accelerated. As the electrical double layer is very thin, Qfix have no influences on the sedimentation potential; as a result, the sedimentation potentials are all near a constant. When the surface potential is large, the accelerations or decelerations of sedimentation velocity are more notable. The larger the volume fraction (H), the reduced range of sedimentation velocity by the polarization is getting smaller, and the sedimentation potential is larger.
Subjects
沉降電位
沉降速度
球形孔洞
軟球
soft particle
cavity
sedimentation velocity
sedimentation potential
Type
thesis
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