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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.
ISSN: ISSN 1550-2376 (online)
1539-3755 (print)
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Copyright: (2004) by the American Physical Society
Appears in Collections:Research Papers (SCM)

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