1 research outputs found
Balance of Coordination and Hydrophobic Interaction in the Formation of Bilayers in Metal-Coordinated Surfactant Mixtures
Metal–ligand coordination
and hydrophobic interaction are
two significant driving forces in the aggregation of mixtures of M<sup><i>n</i>+</sup> surfactants and alkyldimethylamine oxide
(C<sub><i>n</i></sub>DMAO) in aqueous solutions. The coordinated
systems exhibit rich aggregation behavior. This study investigated
the effect of M<sup><i>n</i>+</sup> ions (Zn<sup>2+</sup>, Ca<sup>2+</sup>, Ba<sup>2+</sup>, Al<sup>3+</sup>, Fe<sup>3+</sup>, La<sup>3+</sup>, Eu<sup>3+</sup>, and Tb<sup>3+</sup>) and hydrophobic
chains (hydrocarbon and fluorocarbon) on the formation of metal-coordinated
bilayers. We found that fluorocarbon chains and branched hydrocarbon
chains are preferable to the corresponding linear hydrocarbon chains
for the formation of an L<sub>α</sub> phase. Moreover, L<sub>α</sub> phases formed by fluorocarbon chains exhibited higher
viscoelasticity than ones formed by the hydrocarbons, and the bilayers
formed by branched chains were rather flexible, revealing obvious
undulation. The construction of bilayers was also strongly affected
by metal ions due to their variable coordination ability with C<sub><i>n</i></sub>DMAO. Our results contribute to the understanding
of the formation of metal-coordinated bilayers, which is driven by
the interplay of noncovalent forces