title: New insights into interactions between dendrimers and surfactants. 4. Fast-exchange/slow-exchange transitions in the structure of dendrimer-surfactant aggregates.
abstract: The interactions between poly(amidoamine) (PAMAM) dendrimer and surfactant (sodium dodecyl sulfate, SDS) in aqueous solutions were investigated by a combination of (1)H NMR, diffusion measurements (PFG NMR), and NOE techniques. The diffusion studies suggested that different types of dendrimer-surfactant aggregates are formed by varying surfactant concentrations in the dendrimer solution. The (1)H NMR analysis proved that the presence of fast-exchange/slow-exchange transitions in the dendrimer-surfactant aggregates. The supramolecular structure of the aggregate was based on the hydrophobic interactions between the dendrimer scaffold and the surfactant aliphatic chain, as well as electrostatic/hydrogen-bond interactions between dendrimers and SDS monomers, bilayers, or globular micelles. In comparison with previous investigations, the present study provides a new insight into interactions between dendrimers and surfactants, which may be helpful for the design of dendrimer-based microreactors or nanovehicles.
authors.affiliation: CAS Key Laboratory of Soft Matter Chemistry, School of Chemistry and Material Science, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China.
authors.forename: Min
authors.initials: M
authors.lastname: Fang
authors.forename: Yiyun
authors.initials: Y
authors.lastname: Cheng
authors.forename: Jiahai
authors.initials: J
authors.lastname: Zhang
authors.forename: Qinglin
authors.initials: Q
authors.lastname: Wu
authors.forename: Jingjing
authors.initials: J
authors.lastname: Hu
authors.forename: Libo
authors.initials: L
authors.lastname: Zhao
authors.forename: Tongwen
authors.initials: T
authors.lastname: Xu