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Changes in mobile phase ion distribution when combining pressurized flow and electric field.
Björn O Eriksson1, Magnus Dahl, Magnus B O Andersson
1Department of Chemistry, Karlstad University, Karlstad, Sweden.
Electrophoresis
|October 9, 2004
Summary
Ion distribution in capillaries under pressurized flow and electric fields was studied. Results show ion concentration increases near the capillary wall at the electric field
Area of Science:
- Electrokinetics
- Fluid Dynamics
- Analytical Chemistry
Background:
- Previous studies indicated increased ion concentration in capillaries with high electric fields and pressurized flow.
- Understanding ion distribution is crucial for applications involving capillary electrophoresis and microfluidics.
Purpose of the Study:
- To investigate the spatial distribution of ions within a capillary under combined pressurized flow and electric fields.
- To elucidate the influence of flow profile and electric mobility on ion concentration gradients.
Main Methods:
- Combined experimental current measurements with computational finite element analysis.
- Analyzed ion distribution along the capillary length and in the radial direction.
Main Results:
- Ion concentration, driven by electric mobility towards the flow, significantly increases at the electric field's initiation and near the capillary wall.
- The parabolic flow profile dictates the observed ion distribution patterns.
Conclusions:
- The findings provide a detailed understanding of ion transport mechanisms in such systems.
- An alternative explanation for voltage-induced capacity factor variations is proposed based on these results.