Universität zu Köln

Moradi, N., Zakrevskyy, Yuriy, Javadi, A., Aksenenko, E. V., Fainerman, V. B., Lomadze, Nino, Santer, Svetlana ORCID: 0000-0002-5041-3650 and Miller, R. (2016). Surface tension and dilation rheology of DNA solutions in mixtures with azobenzene-containing cationic surfactant. Colloid Surf. A-Physicochem. Eng. Asp., 505. S. 186 - 193. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1873-4359

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Abstract

The surface tension and dilational surface visco-elasticity of the individual solutions of the biopolymer DNA and the azobenzene-containing cationic surfactant AzoTAB, as well as their mixtures were measured using the drop profile analysis tensiometry. The negatively charged DNA molecules form complexes with the cationic surfactant AzoTAB. Mixed DNA + AzoTAB solutions exhibit high surface activity and surface layer elasticity. Extremes in the dependence of these characteristics on the AzoTAB concentration exist within the concentration range of 3 x 10(-6)-5 x 10(-5) M. The surface tension of the mixture shows a minimum with a subsequent maximum. In the same concentration range the elasticity shows first a maximum and then a subsequent minimum. A recently developed thermodynamic model was modified to account for the dependence of the adsorption equilibrium constant of the adsorbed complex on the cationic surfactant concentration. This modified theory shows good agreement with the experimental data both for the surface tension and the elasticity values over the entire range of studied AzoTAB concentrations. (C) 2016 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Moradi, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zakrevskyy, Yuriy UNSPECIFIED UNSPECIFIED UNSPECIFIED Javadi, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Aksenenko, E. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fainerman, V. B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lomadze, Nino UNSPECIFIED UNSPECIFIED UNSPECIFIED Santer, Svetlana UNSPECIFIED orcid.org/0000-0002-5041-3650 UNSPECIFIED Miller, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-262226
DOI:	10.1016/j.colsurfa.2016.04.021
Journal or Publication Title:	Colloid Surf. A-Physicochem. Eng. Asp.
Volume:	505
Page Range:	S. 186 - 193
Date:	2016
Publisher:	ELSEVIER SCIENCE BV
Place of Publication:	AMSTERDAM
ISSN:	1873-4359
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ADSORPTION BEHAVIOR; CONDENSATION; INTERFACES; WATER/AIR; LAYERS; DROP Multiple languages Chemistry, Physical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26222