Viscoelastic properties of supramolecular gemini-like surfactant solutions in the absence of inorganic salts. Issue 76 (13th October 2017)

• Record Type: Journal Article
• Authors: Xie, Danhua; You, Donghong; Ying, Shaoming; Song, Binglei; Tian, Jinnian
• Is Part Of: RSC advances. Volume 7:Issue 76(2017)
• Page Start: 48120
• Page End: 48126
• Publication Date: 2017-10-13
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra08435h
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A bola-type cation and a newly synthesized anionic surfactant together generate a supramolecular gemini-like structure via electrostatic interactions, which facilitates the formation of wormlike micelles. Abstract : Exploration of novel wormlike micelle systems is important for both the theory and applications of surfactant self-assembly. A new anionic surfactant, sodium 2-phenoxyhexadecanoate (sodium Ph-C16), was synthesized in this work. This surfactant can self-assemble in solution to form wormlike micelles with the help of a bolaform salt, ethane-1, 2-bis(trimethyl ammonium bromide) (N-2-N bromide), by removing inorganic salts. The resultant aqueous system was investigated using rheological measurements, freeze-fractured-TEM and 2D NOESY 1 H NMR experiments. A supramolecular gemini-like structure constructed from electrostatic interactions was a prerequisite for the wormlike micelle formation. The zero shear viscosity ( η 0 ) of the system had a very strong dependence on the surfactant concentration with a scaling exponent of 16.8 in the semi-dilute region, which is attributed to the extremely strong electrostatic attraction between the surface-active anions and bolaform cations. These results are beneficial for understanding anionic wormlike micelles in the absence of inorganic salts.