Electrophoresis of a Sphere along the Axis of a Cylindrical Pore: Effects of Double-Layer Polarization and Electroosmotic Flow | Zendy

JyhPing Hsu | Zendy; Zheng-Syun Chen | Zendy

Open Access

Electrophoresis of a Sphere along the Axis of a Cylindrical Pore: Effects of Double-Layer Polarization and Electroosmotic Flow

Author(s) -

JyhPing Hsu,

Zheng-Syun Chen

Publication year - 2007

Publication title -

langmuir

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.042

H-Index - 333

eISSN - 1520-5827

pISSN - 0743-7463

DOI - 10.1021/la070079m

Subject(s) - electrophoresis , chemistry , polarization (electrochemistry) , double layer (biology) , boundary layer , concentration polarization , layer (electronics) , molecular physics , mechanics , chromatography , physics , membrane , biochemistry , organic chemistry

The electrophoresis of a rigid sphere along the axis of a cylindrical pore is investigated theoretically. Previous analysis is extended to the case where the effects of double-layer polarization and electroosmotic flow can be significant. The influences of the surface potential, the thickness of the double layer, and the relative size of a pore on the electrophoretic behavior of a sphere are discussed. Some interesting results are observed. For example, if both a sphere and a pore are positively charged, then the mobility of the sphere has a local minimum as the thickness of its double layer varies. Depending upon the level of the surface potential of a sphere and the degree of significance of the boundary effect, the mobility of the sphere may change its sign twice as the thickness of its double layer varies. This result can play a significant role in electrophoresis measurements.

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