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http://hdl.handle.net/2289/1271
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) |
Files in This Item:
File | Description | Size | Format | |
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2004 PRE 69 p031905.pdf | 4 pages | 94.63 kB | Adobe PDF | View/Open |
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