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Using Plasma Etching to Access the Polymer Density Distribution and Diffusivity of Gel Particles.
Ivan J Suarez1, Benjamin Sierra-Martin1, Antonio Fernandez-Barbero1,2
1NanoLab, Department of Chemistry and Physics, University of Almeria, 04120 Almeria, Spain.
Polymers
|August 10, 2021
Summary
Investigating polymer gel particles revealed that internal polymer density significantly impacts solvent diffusion. Plasma etching uncovered density heterogeneity, showing higher concentrations toward the particle core, affecting solvent movement.
Area of Science:
- Polymer Science
- Materials Science
- Physical Chemistry
Background:
- Gel particles are crucial in various applications, but their internal structure and its effect on transport properties are not fully understood.
- Understanding polymer density distribution is key to controlling solvent diffusion within these networks.
Purpose of the Study:
- To investigate the polymer density distribution within gel particles.
- To determine the effect of this density distribution on solvent diffusivity.
- To correlate internal particle structure with diffusion characteristics.
Main Methods:
- Utilized plasma etching to remove external polymer layers and expose inner particle regions.
- Quantified polymer density changes and heterogeneity after etching.
- Developed an exponential decay model for polymer density.
- Measured solvent diffusion coefficients before and after plasma treatment.
Main Results:
- Plasma etching revealed internal polymer density heterogeneity, increasing towards the particle center.
- An exponential decay model successfully described the polymer density profile with a measured spatial relaxation length.
- A direct correlation was observed between the internal polymer density and the solvent diffusion coefficient.
Conclusions:
- The internal polymer density distribution significantly influences solvent diffusivity in gel particles.
- Plasma etching is an effective method for probing internal particle structure and density gradients.
- The findings provide insights for designing gel materials with controlled transport properties.
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