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Nanomaterials 2015, 5(2), 722-736; doi:10.3390/nano5020722

Titration of DNA/Carbon Nanotube Complexes with Double-Chained Oppositely Charged Surfactants

Department of Chemistry, La Sapienza University, P.le A. Moro 5, 00185 Rome, Italy
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: Stephen Ralph
Received: 22 January 2015 / Revised: 26 March 2015 / Accepted: 10 April 2015 / Published: 30 April 2015
(This article belongs to the Special Issue Frontiers in Nucleic Acid Nanotechnology)
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Abstract

1/1 dispersions of ss-DNA/CNT complexes in mass ratios were investigated in a mixture with didodecyldimethylammonium bromide, DDAB. Depending on the amounts of the surface-active agent and of the complexes, solutions, precipitates, or re-dissolution occur. DDAB titrates the phosphate groups on the outer surface of the complex and controls the phase sequence in these systems. The combination of different experimental methods determined the phases that occur therein. The results are based on optical absorbance, Dynamic Light Scattering, ionic conductivity, ζ-potential, optical microscopy and AFM. From the above findings a (pseudo)-binary phase diagram is attained. The system has strong similarities with polymer-surfactant mixtures. In fact, its properties conform to cases in which interactions between rigid rod-like polyelectrolytes and oppositely charged species take place. The peculiarities of double-chained DDAB in the process imply significant differences with respect to the behavior of single chain surfactants. In fact, DDAB associates into vesicular entities, when the homologous single chain species forms small micellar aggregates. View Full-Text
Keywords: single- and double strand DNA; ss-DNA and ds-DNA; multi-walled carbon nanotubes (MWCNTs); 1/1 ss-DNA/MWCNT complexes; double-chained cationic surfactants; phase diagram single- and double strand DNA; ss-DNA and ds-DNA; multi-walled carbon nanotubes (MWCNTs); 1/1 ss-DNA/MWCNT complexes; double-chained cationic surfactants; phase diagram
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tardani, F.; Mesa, C.L. Titration of DNA/Carbon Nanotube Complexes with Double-Chained Oppositely Charged Surfactants. Nanomaterials 2015, 5, 722-736.

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