New Insights into Interactions between Dendrimers and Surfactants. 4. Fast-Exchange/Slow-Exchange Transitions in the Structure of Dendrimer−Surfactant Aggregates
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- 作者：Min Fang ; Yiyun Cheng ; Jiahai Zhang ; Qinglin Wu ; Jingjing Hu ; Libo Zhao ; Tongwen Xu
- 刊名：Journal of Physical Chemistry B
- 出版年：2010
- 出版时间：May 13, 2010
- 年：2010
- 卷：114
- 期：18
- 页码：6048-6055
- 全文大小：259K
- 年卷期：v.114,no.18(May 13, 2010)
- ISSN：1520-5207
文摘
The interactions between poly(amidoamine) (PAMAM) dendrimer and surfactant (sodium dodecyl sulfate, SDS) in aqueous solutions were investigated by a combination of 1H 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 1H 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.