Diffusiophoresis of a Charged-regulated, Zwitterionic Polyelectrolyte: Influence of Multiple Ionic Species and Nonuniform Channel Cross Section
Date Issued
2015
Date
2015
Author(s)
Su, Chun-Yuan
Abstract
In this thesis, the diffusiophoretic behaviors of a charge-regulated polyelectrolyte (PE) is modeled theoretically. The charged conditions of a particle depend upon the solution properties such as pH and ionic concentration, and the solution contains multiple ionic species, so that the model considered is closer to reality than previous studies. Two typical problems are considered. In the first problem, we consider the diffusiophoresis of a charge-regulated PE in a solution containing multiple ionic species. The influences of the ionic concentration, the solution pH, and the density of the dissociable functional groups of the PE on its diffusiophoretic behavior are examined. We show that the presence of H+ and OH reduces the induced electric field arising from the diffusiophoresis of the PE, thereby affecting its mobility. In the second problem, we consider the diffusiophoresis of a charge-regulated PE in a charged channel having nonuniform cross section. The solution pH, channel width, and the PE position in the channel are examined for their influences on the diffsiophoretic behavior of the PE. We show that the PE mobility can be adjusted by these factors, thereby providing valuable and necessary information for designing devices, for example, for DNA sensing and protein analysis.
Subjects
Diffusiophoresis
Polyelectrolyte
pH-regulated
multiple ion
Nonuniform nanopore
Type
thesis
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