title: Synthesis and phase characterization of a double-tailed pyrrole-containing surfactant: a novel tecton for the production of functional nanostructured materials.
abstract: A double-tailed polymerizable (pyrrolylalkyl) ammonium amphiphile has been synthesized, and its interfacial properties and aqueous phase behavior have been studied by polarized optical microscopy and X-ray diffraction. The Krafft temperature is about 27 degrees C, and the critical micelle concentration at 40 degrees C is about 1 mM, as obtained from surface tension measurements, potentiometry, and isothermal titration calorimetry. The lyotropic behavior of the surfactant is found to be of a complex nature. At concentrations higher than the micellar (L1) region, two mesophases have been identified: a second isotropic (L2) phase, which is probably micellar but not fully miscible with water, and a lamellar (L(alpha)) phase, showing interesting alignment properties. Small-angle X-ray scattering analysis of the mesophases has been evaluated in terms of a model of spherical micelles, which describes a mutual arrangement by a structure factor derived from a hard-sphere potential (Percus-Yevick, "PY", approach). Interest in the comprehensive phase behavior of the polymerizable surfactant is based on the desire to integrate the system into a composite material to obtain potentially conducting self-assembled hybrid mesostructures.
authors.affiliation: Max Planck Institute of Colloids and Interfaces, Research Campus Golm, D-14424 Potsdam, Germany.
authors.forename: Danielle
authors.initials: D
authors.lastname: Franke
authors.forename: Chrystelle C
authors.initials: CC
authors.lastname: Egger
authors.forename: Bernd
authors.initials: B
authors.lastname: Smarsly
authors.forename: Charl F J
authors.initials: CF
authors.lastname: Faul
authors.forename: Gordon J T
authors.initials: GJ
authors.lastname: Tiddy