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Partition, Reaction, and Diffusion Coefficients of Bromine in Elastomeric Polydimethylsiloxane
Maria Eleni Moustaka1, Michael M Norton1, Baptiste Blanc1
1Department of Physics, Brandeis University, Waltham, Massachusetts 02453, United States.
The Journal of Physical Chemistry. B
|May 28, 2021
Summary
This study quantifies how bromine permeates and reacts within polydimethylsiloxane (PDMS), providing crucial data for designing PDMS-based microfluidic devices used in chemical oscillator studies.
Area of Science:
- Materials Science
- Chemical Engineering
- Polymer Chemistry
Background:
- Polydimethylsiloxane (PDMS) is widely used in microfluidic devices.
- Understanding chemical interactions within PDMS is vital for device performance.
Purpose of the Study:
- To quantify the permeation and reaction kinetics of aqueous bromine within PDMS.
- To develop a reaction-diffusion model for bromine transport in PDMS.
Main Methods:
- Experiments involving immersion of PDMS films in bromine water.
- Spectrophotometric measurement of aqueous bromine absorbance over time.
- Kinetic analysis as a function of PDMS film mass and thickness.
- Modeling to decouple reversible and irreversible bromine-PDMS interactions.
Main Results:
- Determined partition coefficient, diffusion constant, and reaction rate constants for bromine in PDMS.
- Quantified reversible binding (on/off rates) and irreversible reaction parameters.
- Identified reactive sites within the PDMS matrix.
Conclusions:
- A quantitative reaction-diffusion model for bromine in PDMS was developed.
- This model is essential for designing PDMS microfluidic devices for reaction-diffusion studies.
- Findings support the use of PDMS in complex chemical oscillator systems.
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