Phase Transitions in DNA/Surfactant Adsorption Layers

The adsorption layers of complexes between DNA and oppositely charged surfactants dodecyltrimethylammonium bromide (DTAB) and cetyltrimethylammonium bromide (CTAB) at the solution/air interface were studied with surface tensiometry, dilational surface rheology, atomic force microscopy, Brewster angl...

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Bibliographic Details
Published in:Langmuir 2016-12, Vol.32 (50), p.13435-13445
Main Authors: Lyadinskaya, Vanda V, Lin, Shi-Yow, Michailov, Alexander V, Povolotskiy, Alexey V, Noskov, Boris A
Format: Article
Language:English
Subjects:
Adsorption
DNA - chemistry
Rheology
Surface Properties
Surface-Active Agents - chemistry
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Summary:The adsorption layers of complexes between DNA and oppositely charged surfactants dodecyltrimethylammonium bromide (DTAB) and cetyltrimethylammonium bromide (CTAB) at the solution/air interface were studied with surface tensiometry, dilational surface rheology, atomic force microscopy, Brewster angle microscopy, infrared absorption–reflection spectroscopy, and ellipsometry. Measurements of the kinetic dependencies of the surface properties gave a possibility to discover the time intervals corresponding to the coexistence of two-dimensional phases. One can assume that the observed phase transition is of the first order, unlike the formation of microaggregates in the adsorption layers of mixed solutions of synthetic polyelectrolytes and surfactants. The multitechniques approach together with the calculations of the adsorption kinetics allowed the elucidation of the structure of coexisting surface phases and the distinguishing of four main steps of adsorption layer formation at the surface of DNA/surfactant solutions.
ISSN:0743-7463
1520-5827
DOI:10.1021/acs.langmuir.6b03396