The induced crystallization of polyelectrolyte (PE)-surfactant complexes was studied at the gas-water interface. It was shown that minute surfactant concentrations induced the formation of a PE-surfactant complex at the gas-solution interface, during the synchrotron X-ray and surface-tension studies of a strong in the semidilute regime with varying surfactant concentrations. It was demonstrated that the complex PE-surfactant resides at the interface and the alkyl chains of the surfactant form a two-dimensional liquidlike monolayer, by X-ray reflectivity and grazing angle X-ray diffraction. The columnar crystals with distorted-hexagonal symmetry were formed with the addition of salt (NaCl).
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We wish to thank M. Muthukumar and D. S. Robinson for helpful discussions. The MUCAT sector at the APS is supported by the U.S. DOE Basic Energy Sciences, Office of Science, through Ames Laboratory under Contract No. W-7405-Eng-82. Measurements were supported by the U.S. DOE, Basic Energy Sciences, Office of Science, under Contract No. W-31-109-Eng-38.