Interfacial stoichiometry of polyelectrolyte/surfactant films spread from aggregates: effects of aggregate charge and ionic strength
The non-equilibrium nature of polyelectrolyte/surfactant mixture has received due attention over the last few years. Very recently we have exploited the dissociation and Marangoni spreading at the air/water interface of aggregates formed in the bulk to generate highly efficient membranes with a much higher surface excess than can be achieved from equilibrium adsorption. The NaPSS/DTAB films measured to date are present in a kinetically-trapped state and, thanks to resolution of the dynamic interfacial composition using a novel application of FIGARO, we have shown that they are durable with a faithful surface stoichiometry of 1:1 binding. Following our initial conceptual study last September, we propose now to go on to deliver a thorough characterization of the system with respect to the charge of the aggregates spread and the ionic strength of the subphase. Prior ellipsometry and surface pressure isotherm measurements clearly motivate the need for us to gain a deeper understanding of these parameters. The results should not only generate a comprehensive full paper but also lead to final-year work on encapsulation and deposition-based applications for the PhD student involved.
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TUMMINO Andrea; Richard A. Campbell; FEHER Bence; LUCHINI Alessandra and VARGA Imre. (2016). Interfacial stoichiometry of polyelectrolyte/surfactant films spread from aggregates: effects of aggregate charge and ionic strength. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-461
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