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Reentrant phase transitions of DNA-surfactant complexes

Krishnaswamy, Rema and Raghunathan, VA and Sood, AK (2004) Reentrant phase transitions of DNA-surfactant complexes. In: Physical Review E (Statistical, Nonlinear, and Soft Matter Physics), 69 (3). pp. 31905-1.


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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 (HIc)-lamellar (L ac )-inverted hexagonal (HIIc ) transformation is found on increasing hexanol content. The HII c structure is converted into L a c on adding more DNA. Further increase in hexanol content leads to a phase separation in the surfactant solution, and a reentrant L a c-HII c -L a c 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.

Item Type: Journal Article
Publication: Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)
Publisher: American Physical Society (APS)
Additional Information: Copyright for this article belongs to American Physical Society (APS).
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 10 Dec 2004
Last Modified: 19 Sep 2010 04:12
URI: http://eprints.iisc.ac.in/id/eprint/417

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