Solvent distribution in non-ionic surfactant monolayers
Literature Information
R. K. Thomas
The distribution of solvent in the adsorbed monolayers of the non-ionic surfactants monododecyl hexaethylene glycol, C12E6, and monododecyl octaethylene glycol, C12E8, at the air–water interface has been determined from specular neutron reflectivity measurements. The data is analysed by the method of partial structure factors, and the solvent distribution is described by a new approach that improves previous estimates based on a tanh profile. An improved description and quantification of hydration in surface adsorbed layers is required for the further development of the thermodynamic treatment of surfactant mixing at interfaces. It is a term currently neglected in theories based on the pseudo phase approximation. However, the comparison of some recent neutron reflectivity results and surface tension data for mixed surfactants suggests that its contribution may be important.
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Physical Chemistry Chemical Physics

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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