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Slow complexation dynamics between linear short polyphosphates and polyallylamines: analogies with "layer-by-layer"
Nejla Cini1, Tulay Tulun, Christian Blanck
1Faculty of Sciences and Letters, Department of Chemistry, Technical University of Istanbul, 34469 Maslak, Istanbul, Turkey.
Physical Chemistry Chemical Physics : PCCP
|January 27, 2012
Summary
This study investigates the kinetics of polyelectrolyte complex formation between sodium polyphosphate (PSP) and poly(allylamine hydrochloride) (PAH). We observed complex growth and zeta potential changes, offering insights into polyelectrolyte complex structure.
Area of Science:
- Polymer Science
- Materials Science
- Physical Chemistry
Background:
- Polyelectrolyte complexes are widely used in cosmetics and DNA transfection.
- Previous research primarily focused on the thermodynamics of complex formation, neglecting kinetic aspects.
- Understanding complexation kinetics is crucial for optimizing applications.
Purpose of the Study:
- To investigate the kinetics of polyelectrolyte complex formation between sodium polyphosphate (PSP) and poly(allylamine hydrochloride) (PAH).
- To analyze the influence of varying NaCl concentrations on complexation kinetics.
- To elucidate the structural characteristics of the formed complexes.
Main Methods:
- Utilized a combination of physicochemical techniques to study complexation.
- Monitored particle size changes and zeta potential during complex formation.
- Analyzed counterion release and compared results with layer-by-layer deposition.
Main Results:
- Complexes formed at a 1:1 molar ratio of phosphate and amino groups, initially measuring a few hundred nanometers and growing up to 1.5 microns.
- Complex growth was accompanied by sedimentation and counterion release.
- Zeta potential shifted from positive to -20 mV, consistent with deposited films.
Conclusions:
- The study provides insights into the slow aggregation kinetics of PSP-PAH complexes.
- Observed zeta potential changes suggest structural similarities between complexes and deposited films.
- Findings contribute to a better understanding of polyelectrolyte complex formation and structure.
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