Induced crystallization of polyelectrolyte-surfactant complexes at the gas-water interface |
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Authors: | Vaknin D Dahlke S Travesset A Nizri G Magdassi S |
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Institution: | Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA. |
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Abstract: | Synchrotron x-ray and surface-tension studies of a strong polyelectrolyte (PE) in the semidilute regime (approximately 0.1 M monomer charges) with varying surfactant concentrations show that minute surfactant concentrations induce the formation of a PE-surfactant complex at the gas-solution interface. X-ray reflectivity and grazing angle x-ray diffraction show the complex PE-surfactant resides at the interface and the alkyl chains of the surfactant form a two-dimensional liquidlike monolayer. With the addition of salt (NaCl), columnar crystals with distorted-hexagonal symmetry are formed. |
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