Nanoparticles with a bicontinuous cubic internal structure formed by cationic and non-ionic surfactants and an anionic polyelectrolyte.

摘要: Nanoparticles with an internal structure have been prepared by dispersing under dilute conditions poly(acrylic acid) a polymerization degree n = 6000 (PAA6000) together cationic surfactant hexadecyltrimethylammonium hydroxide (C16TAOH) and the non-ionic penta(ethylene glycol) monododecyl ether (C12E5) in water. The nanoparticles are formed at different mixing ratios corresponding two-phase regions (liquid crystalline phase/dilute isotropic phase) of C16TAPA6000 complex salt/C12E5/water ternary phase diagram. particles consist polyacrylate PA6000– polyions, C16TA+ ions, C12E5. Their ordering was identified small-angle X-ray scattering (SAXS) to be either bicontinuous cubic Ia3d crystallographic space group or normal hexagonal depending upon amount phase, our knowledge never observed before polyelectrolyte–surfactant particle systems, inferred SAXS experiments. data also showed that this is thermoresponsive reversible manner. transforms from Im3m as temperature decreases 25 15 °C. According dynamic light electrophoretic mobility measurements, well-defined size (apparent hydrodynamic radii RH range 88–140 nm) carry positive net charge. stable up 1 month. faceted visualized cryogenic transmission electron microscopy reveals their coexistence thread-like C12E5 micelles.