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Micelle growth of cationic gemini surfactants studied by NMR and by time-resoved fluorescence quenching

Ali Reza Tehrani-Bagha (Institutionen för kemi- och bioteknik, Teknisk ytkemi) ; Krister Holmberg (Institutionen för kemi- och bioteknik, Teknisk ytkemi) ; Magnus Nydén (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; SuMo Biomaterials) ; Lars Nordstierna (Institutionen för kemi- och bioteknik, Teknisk ytkemi)
Journal of Colloid and Interface Science (0021-9797). Vol. 405 (2013), p. 145-149.
[Artikel, refereegranskad vetenskaplig]

The micelle growth of a series of five cationic gemini surfactants has been investigated by time-resolved fluorescence quenching (TRFQ) and by two NMR techniques, line width analysis and diffusometry. The surfactant series was designed such that the effect of a number of variables could be assessed: length of the spacer unit, presence of ester bonds in the tails close to the head groups, and presence of a hydroxyl group in the spacer. For the gemini with long spacer, the micelles remained relatively small in size upon an increase of the concentration. The gemini surfactants with short spacer, on the other hand, showed a considerable micellar growth as the concentration was raised. It is of particular interest that the relatively simple line width analysis of one dimensional H-1 NMR spectra gave qualitatively the same results as the more sophisticated TRFQ and NMR diffusometry techniques.

Nyckelord: Gemini surfactants; Esterquats; NMR diffusometry; Time resolved fluorescence quenching; Micelle shape; Micelle size

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Denna post skapades 2013-08-16. Senast ändrad 2016-04-19.
CPL Pubid: 181661


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Institutionen för kemi- och bioteknik, Teknisk ytkemi (2005-2014)
SuMo Biomaterials


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