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Streaming current and wall dissolution over 48 h in silica nanochannels
Mathias Bækbo Andersen1, Henrik Bruus, Jaydeep P Bardhan
1Department of Micro- and Nanotechnology, Technical University of Denmark, Kongens Lyngby, Denmark. mathias.andersen@nanotech.dtu.dk
Journal of Colloid and Interface Science
|May 7, 2011
Summary
We studied streaming currents in nanochannels using theory and experiments. Our findings enable estimation of silica wall dissolution rates under controlled conditions.
Area of Science:
- Physical Chemistry
- Nanotechnology
- Electrochemistry
Background:
- Streaming current is crucial for understanding fluid dynamics in nanochannels.
- Accurate modeling requires self-consistent treatment of ion transport and surface reactions.
- Previous models lacked two-dimensional analysis and experimental validation for pressure-driven flows.
Purpose of the Study:
- To theoretically and experimentally investigate streaming current in nanochannels.
- To extend a 1D model to 2D for improved accuracy.
- To develop a method for estimating silica wall dissolution rates.
Main Methods:
- Developed a 2D nonlinear Poisson-Boltzmann model for ion concentration profiles.
- Conducted experiments using nanochannels with varying heights and electrolyte compositions.
- Validated the model against experimental data for electro-osmotic and pressure-driven flows.
- Measured streaming currents over time to estimate dissolution rates.
Main Results:
- Achieved good agreement between theoretical predictions and experimental data.
- Validated the model using literature values for chemical reaction constants and capacitances.
- Quantified silica wall dissolution rates around 0.01 mg/m(2)/h (40 nm/yr).
Conclusions:
- The 2D model accurately predicts streaming currents in nanochannels.
- The developed method provides a reliable way to estimate silica dissolution.
- This research contributes to understanding nanochannel behavior and material degradation.
