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NMR Characterization of the Aggregation State of the Azo Dye Sunset Yellow in the Isotropic Phase

journal contribution
posted on 2023-06-08, 00:07 authored by Matthew P Renshaw, Iain Day
The azo dye sunset yellow is known to form lyotropic liquid crystals as a function of both temperature and sample composition. Numerous studies have been performed to investigate the aggregation processes in these liquid crystals; however, less attention has been paid to the nature of the aggregates in the isotropic phase. In this study we employ diffusion nuclear magnetic resonance methods to investigate the hydrodynamic properties of sunset yellow aggregates at a range of concentrations in isotropic solution. The results of these experiments are interpreted in terms of a simple thermodynamic model for aggregation and suggest that the aggregates are comprised of tens to hundreds of monomer units at the concentrations investigated. The results also demonstrate that the average number of molecules per aggregate is a factor of approximately 5 larger than previously reported.

History

Publication status

  • Published

Journal

Journal of Physical Chemistry B

ISSN

1520-6106

Publisher

American Chemical Society

Issue

31

Volume

114

Page range

10032-10038

Department affiliated with

  • Chemistry Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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