Structure of mesh phases in cationic surfactant systems with strongly bound counterions: influence of the surfactant headgroup and the counterion

Ghosh, Sajal Kumar; Raghunathan, V.A.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/3766

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DC Field	Value	Language
dc.contributor.author	Ghosh, Sajal Kumar	-
dc.contributor.author	Raghunathan, V.A.	-
dc.date.accessioned	2009-05-22T11:35:52Z	-
dc.date.available	2009-05-22T11:35:52Z	-
dc.date.issued	2009-01-29	-
dc.identifier.citation	Langmuir, 2009, Vol. 25(5), p2622-2628	en
dc.identifier.issn	0743-7463	-
dc.identifier.issn	1520-5827 (Online)	-
dc.identifier.uri	http://hdl.handle.net/2289/3766	-
dc.description	Restricted Access.	en
dc.description.abstract	We have studied the phase behavior of concentrated aqueous solutions of cetylpyridinium bromide (CPB) and sodium 3-hydroxy-2-naphthoate (SHN) using X-ray diffraction and polarizing optical microscopy. The phase behavior of this system is found to be very similar to that of the cetyltrimethylammonium bromide (CTAB)−SHN−water system, reported by us recently (Ghosh, S. K., et al. Langmuir, 2007, 23, 3606), but with the important difference that the mesh-like aggregates in the present system have square symmetry, instead of the hexagonal symmetry seen in the earlier case. A random mesh phase without long-range correlations of the in-plane structure, as well as an ordered mesh phase, where the mesh-like aggregates lock into a three-dimensional lattice, are observed, as in the CTAB−SHN−water system. The mesh-like aggregates do not form when the hydroxynaphthoate counterion is replaced by either salicylate or tosylate, which are also known to bind strongly to the surfactant micelle. Instead, the phase behavior of these ternary mixtures is akin to that of the CPB−water binary system; the only liquid crystalline phase observed being the hexagonal phase made up of cylindrical micelles. These results show the extreme sensitivity of the structure and stability of mesh phases to subtle changes in the interheadgroup interactions.	en
dc.language.iso	en	en
dc.publisher	American Chemical Society	en
dc.relation.uri	http://dx.doi.org/10.1021/la803605t	en
dc.rights	2009 American Chemical Society	en
dc.title	Structure of mesh phases in cationic surfactant systems with strongly bound counterions: influence of the surfactant headgroup and the counterion	en
dc.type	Article	en
Appears in Collections:	Research Papers (SCM)

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