Structuring of poly(DADMAC) chains in aqueous media: a comparison between bulk and free-standing film measurements
文献情報
Regine v. Klitzing, Branko Kolarić, Werner Jaeger, Astrid Brandt
Recently, thin film balance (TFB) measurements have shown that foam films (thickness 5–120 nm) containing polyelectrolytes thin stepwise. This was connected to the ordering of the polyelectrolyte chains in the film, since pure foam films thin in a continuous way. The present paper shows disjoining pressure isotherms of films containing the polycation poly(DADMAC) and small angle neutron scattering (SANS) spectra of the corresponding aqueous solutions at different polyelectrolyte concentrations. The steps Δh in the isotherms are of the same size as the correlation length ξ in the bulk solution. This leads to the conclusion that the interactions between the polyelectrolyte chains which are responsible for their structuring in the bulk determines also the stratification behavior of polyelectrolyte/surfactant films. These findings were confirmed by the influence of further parameters like the molecular weight, the ionic strength and the degree of charge. The results of the TFB measurements and the SANS experiments show the same dependence on these parameters.
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.










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