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Observation of a vanishing miscibility loop in the phase diagram of solutions of a mixed non-ionic-ionic amphiphile

✍ Scribed by Lucia De Salvo Souza; Mario Corti; Laura Cantú; Vittorio Degiorgio

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
453 KB
Volume
131
Category
Article
ISSN
0009-2614

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✦ Synopsis

Aqueous solutions of dodecyl hexaoxyethylene ether (the non-ionic amphiphile CIZE6) with added sodium dodecyl sulfate (SDS) show a closed solubility loop which shrinks progressively as the SDS/C12E6 molar ratio r increases and disappears when r is larger than 0.013. The results are explained by noting that the interaction potential between two mixed micelles contains, besides an attractive part typical of non-ionic micelles, an electrostatic repulsive contribution.

' This assumption may be questionable. See the discussions in refs. [l-5].

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