Title:	Reentrant phase transitions of DNA-surfactant complexes
Authors:	Krishnaswamy, Rema Raghunathan, V.A. Sood, A.K.
Issue Date:	2004
Publisher:	The American Physical Society
Citation:	Physical Review E, 2004, Vol.69, 031905-031905
Abstract:	Complexes of double-stranded DNA with the cationic surfactant cetyltrimethylammonium bromide have been studied using small angle x-ray diffraction at varying concentrations of DNA and the cosurfactant hexanol. At low DNA concentrations, an intercalated hexagonal (H<sub>I</sub><sup>c</sup>)-->lamellar (L<sub>alpha</sub><sup>c</sup>)-->inverted hexagonal (H<sub>II</sub><sup>c</sup>) transformation is found on increasing hexanol content. The H<sub>II</sub><sup>c</sup> structure is converted into L<sub>alpha</sub><sup>c</sup> on adding more DNA. Further increase in hexanol content leads to a phase separation in the surfactant solution, and a reentrant L<sub>alpha</sub><sup>c</sup>-->H<sub>II</sub><sup>c</sup>-->L<sub>alpha</sub><sup>c</sup> transition is observed as DNA concentration is increased. Such structural transformations of DNA-surfactant complexes, driven by DNA concentration, have not been reported until now.
URI:	http://hdl.handle.net/2289/1271
ISSN:	ISSN 1550-2376 (online) 1539-3755 (print)
Alternative Location:	http://link.aps.org/abstract/PRE/v69/e031905
Copyright:	(2004) by the American Physical Society
Appears in Collections:	Research Papers (SCM)

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