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Simultaneous estimation of zeta potential and slip coefficient in hydrophobic microchannels
1Department of Chemical and Biomolecular Engineering, Sogang University, Shinsoo-Dong, Mapo-Gu, Seoul, South Korea. hmpark@sogang.ac.kr
Analytica Chimica Acta
|June 5, 2007
Summary
Accurate electroosmotic flow analysis requires accounting for wall slip in hydrophobic microchannels. This study introduces a novel method to simultaneously estimate zeta potential and slip coefficient, improving flow rate predictions.
Area of Science:
- Fluid dynamics
- Microfluidics
- Surface science
Background:
- Electroosmotic flow (EOF) in hydrophobic microchannels exhibits velocity slip at the wall.
- Wall slip significantly impacts volumetric flow rate and conventional zeta potential estimation.
- Accurate zeta potential determination necessitates accounting for slip effects.
Purpose of the Study:
- To develop a method for simultaneous estimation of zeta potential and slip coefficient in EOF.
- To address the inaccuracies in conventional zeta potential estimation due to wall slip.
- To validate the proposed method using velocity measurements.
Main Methods:
- Developing an inverse problem solution using velocity measurements.
- Employing a conjugate gradient method for performance function minimization.
- Simultaneously estimating zeta potential and slip coefficient.
Main Results:
- The developed method accurately estimates both zeta potential and slip coefficient.
- The method demonstrates robustness even with noisy velocity data.
- Improved accuracy in predicting EOF characteristics in hydrophobic microchannels.
Conclusions:
- A reliable method for simultaneous zeta potential and slip coefficient estimation is presented.
- This approach corrects for velocity slip, enhancing EOF analysis accuracy.
- The findings are crucial for microfluidic device design and applications.
