Mixed Surfactant-Polyelectrolyte Multilayers Containing Sodium Dodecylsulfate
Date of Award
2003
Document Type
Thesis
Degree Name
Bachelors
Department
Natural Sciences
First Advisor
Johal, Malkait
Keywords
Surfactant, Polyelectrolyte, Thin Films
Area of Concentration
Chemistry
Abstract
Understanding the complex relationships in polyelectrolyte-surfactant systems at the molecular level is important to a number of biological and industrial technologies. This study was undertaken to better understand the fundamental properties of polyelectrolyte-surfactant interactions in polyelectrolyte multilayers. Mixed surfactant-polyelectrolyte multilayer films were fabricated by spinassembly and electrostatic self-assembly. The charge alternating layers were comprised of PEI (poly(ethylenimine)) and PAZO (poly[ 1-[4-(3-carboxy-4-hydroxyphenylazo) benzenesulfonamido]-l,2-ethanediyl, sodium salt]). For the spin-assembled system, SDS was mixed with PAZO in solution. The polyanionic layers were then deposited from this mixed solution. For the electrostatically self-assembled system, bulk phase aggregates of PEI-SDS were prepared and then adsorbed directly onto polyanionic layers from aqueous solution. The amount of subsequent polyanion (PAZO) adsorption decreased as bulk solutions contained progressively greater amounts of SDS for both systems. Deposited layers from 10 mM SDS resulted in almost zero PAZO adsorption. This was attributed to charge neutralization in the polyelectrolyte layer, due to strong PEI-SDS electrostatic interactions. The spin-assembly results were compared with previous competitive adsorption studies of a mixed SDS/PAZO system coadsorbed on the pure PEI surface, and a pre 'lmfinary model for the adsorption of PEI-SDS complexes onto an anionic surface is proposed based on the UV-visible spectroscopic, ellipsometric, and contact angle data.
Recommended Citation
St. John, Ashlee, "Mixed Surfactant-Polyelectrolyte Multilayers Containing Sodium Dodecylsulfate" (2003). Theses & ETDs. 3314.
https://digitalcommons.ncf.edu/theses_etds/3314
Rights
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