Amphiphilic second-order phase transitions determined through NMR

In this work, nuclear magnetic resonance (NMR) spectroscopy is used to investigate surfactant phase behavior over a broad concentration region. This technique is an adaptation of a previously developed method applied to detect the critical micelle concentration (CMC) of surfactants. In this method,...

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Bibliographic Details
Published in:Journal of molecular liquids 2018-10, Vol.268, p.647-657
Main Authors: Reilly, Teresa, Mohamed, Mohamed I.H., Lehmann, Teresa E., Alvarado, Vladimir
Format: Article
Language:English
Subjects:
Dynamic light scattering
Nuclear magnetic resonance
Phase transitions
Surfactant
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Summary:In this work, nuclear magnetic resonance (NMR) spectroscopy is used to investigate surfactant phase behavior over a broad concentration region. This technique is an adaptation of a previously developed method applied to detect the critical micelle concentration (CMC) of surfactants. In this method, a surfactant concentration is correlated to the normalized intensity, or area, of the NMR signal for each surfactant. In this procedure a linear relationship develops on either side of the CMC, with a distinct change in slope where the primary phase change occurs. The research conducted herein investigates the NMR response at higher surfactant concentration, where the phase change consists of a change in micelle shape or other structural configurations. These secondary phase transitions can be expected from 10 to 90 wt.%, where the CMC measurements are conducted at concentrations
ISSN:0167-7322
1873-3166
DOI:10.1016/j.molliq.2018.07.066