Issue 17, 2005
From the journal:

Physical Chemistry Chemical Physics

Synthesis and solution properties of gemini surfactants containing oleyl chains†

Xingfu Li,a   Shawn D. Wettig,b   Chuanzhong Wang,c   Marianna Foldvarib  and  Ronald E. Verrall*c  

* Corresponding authors

a Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, Canada

b College of Pharmacy and Nutrition, University of Saskatchewan, 110 Science Place, Saskatoon, Canada

c Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, Canada
E-mail: verrallr@sask.usask.ca

Abstract

Gemini surfactants 18:1-s-18:1, where s = 2, 3, and 6 methylene groups and 18:1 refers to oleyl carbon chains, have been synthesized, characterized and a number of micelle solution properties measured by using electrical conductance, fluorescence probe emission, light scattering (DLS), surface tension and isothermal titration calorimetry (ITC) methods at 25 °C. The cmc values of 18:1-2-18:1, 18:1-3-18:1, and 18:1-6-18:1 were found to be 26.9, 23.4, and 18.0 μM, respectively, using the electrical conductance method. Surface tension results suggest that in 0.01 N NaCl solutions, the s = 2 and 3 members of the series form multilayer rather than monolayer structures, while the s = 6 homologue adopts a close-packed arrangement. This is consistent with DLS and EM measurements which show vesicle formation for the s = 2 and 3 compounds, and micelle formation for the s = 6 compound. The enthalpies of micellization (ΔH°M) are more exothermic for the 18:1-s-18:1 series of surfactants, than for the 12-s-12 series. The differences are rationalized in terms of steric and configurational contributions to ΔH°M arising from difficulties associated with packing of the bulky cis-9-octadecene tails.

Graphical abstract: Synthesis and solution properties of gemini surfactants containing oleyl chains

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Article information

DOI
https://doi.org/10.1039/B507910A
Article type
Paper
Submitted
06 Jun 2005
Accepted
19 Jul 2005
First published
26 Jul 2005

Phys. Chem. Chem. Phys., 2005,7, 3172-3178

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Synthesis and solution properties of gemini surfactants containing oleyl chains

X. Li, S. D. Wettig, C. Wang, M. Foldvari and R. E. Verrall, Phys. Chem. Chem. Phys., 2005, 7, 3172 DOI: 10.1039/B507910A

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