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Title: Tuning the structure of surfactant complexes with DNA and other polyelectrolytes
Authors: Krishnaswamy, Rema
Mitra, P.
Raghunathan, V.A.
Sood, A.K.
Issue Date: 1-May-2003
Publisher: EDP Sciences
Citation: Europhysics Letters, 2003, Vol.62, p357-362
Abstract: We have carried out small-angle X-ray diffraction studies on complexes formed by the anionic polyelectrolytes, namely, sodium salts of double and single stranded (ds and ss) DNA, poly(glutamic acid) (PGA), poly(acrylic acid) (PAA), and poly(styrene sulfonate) (PSS) with a cationic surfactant system consisting of cetyltrimethylammonium bromide (CTAB) and sodium 3-hydroxy-2-naphthoate (SHN). All complexes have a two-dimensional (2D) hexagonal structure at low SHN concentrations. DNA-CTAB-SHN complexes exhibit a hexagonal to lamellar transition near the SHN concentration at which CTAB-SHN micelles show a cylinder to bilayer transformation. On the other hand, PGA and PAA complexes form a 2D centered rectangular phase at higher SHN concentrations, and PSS complexes show a primitive rectangular structure. These results provide a striking example of polyion specificity in polyelectrolyte-surfactant interactions.
Description: Restricted Access.
ISSN: 0295-5075
1286-4854 (Online)
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Copyright: 2003 EDP Sciences
Appears in Collections:Research Papers (SCM)

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