Aggregation of tetrameric acids in aqueous media studied by small-angle neutron scattering

[Display omitted] ► Determination of the aggregated structure of two tetrameric acids (sodium form). ► Determination of structure in aqueous media by SANS. ► Different structures formed in solution as function of the structure of the acids. This article presents the characterization of two self-asso...

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Bibliographic Details
Published in:Journal of colloid and interface science 2013-03, Vol.394, p.277-283
Main Authors: Simon, Sébastien, Knudsen, Kenneth D., Nordgård, Erland, Reisen, Christian, Sjöblom, Johan
Format: Article
Language:English
Subjects:
acids
Agglomeration
Aliphatic compounds
aqueous solutions
ARN
Calcium naphthenate deposits
Chemistry
Colloidal state and disperse state
Crude oil
Deposition
deuterium oxide
Exact sciences and technology
General and physical chemistry
Mathematical models
Media
Micelles
Micelles. Thin films
Naphthenic acids
Neutron scattering
petroleum
SANS
sodium
sodium chloride
Styrene acrylonitrile resins
Tetrameric acids
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Summary:[Display omitted] ► Determination of the aggregated structure of two tetrameric acids (sodium form). ► Determination of structure in aqueous media by SANS. ► Different structures formed in solution as function of the structure of the acids. This article presents the characterization of two self-associated structures, a C80-tetraacid (also known as ARN), which is an aliphatic molecule present in crude oil and responsible for the formation of deposits, and BP-10, a molecule designed to model the properties of the C80-tetraacid. These molecules have four carboxylic functions at the end of four interconnected hydrocarbon chains and can be dissolved in aqueous solution and in basic media. In this paper we have used small-angle neutron scattering (SANS) as the main method to study the tetrameric acids in solution. SANS measurements show that the two molecules (in sodium form) exhibit very different types of aggregation properties in aqueous solution. More specifically, Na4BP-10 forms nanometer-sized micelles with an aggregation number close to 5 (at concentrations above the critical micellar concentration) in both 20mM NaCl and 0.9wt.% 1-butanol media. On the contrary fully ionised C80-TA forms very large structures in pure D2O and NaCl 20mM, so large that their exact dimensions could not be determined by SANS.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2012.12.012