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Interfacial and Aggregation Behavior of Dicarboxylic Amino Acid-Based Surfactants in Combination with a Cationic Surfactant
Department of Chemistry and Chemical Technology, Vidyasagar University, Midnapore, West Bengal, India.
Department of Chemistry and Chemical Technology, Vidyasagar University, Midnapore, West Bengal, India.
Department of Chemistry and Chemical Technology, Vidyasagar University, Midnapore, West Bengal, India.
Chemistry and Chemical Engineering, Applied Surface Chemistry, Chalmers University of Technology, Gothenburg, Sweden.ORCID iD: 0000-0002-0785-2017
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2019 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 35, no 47, p. 15306-15314Article in journal (Refereed) Published
Abstract [en]

The interfacial and micellization behavior of three dicarboxylic amino acid-based anionic surfactants, abbreviated as AAS (N-dodecyl derivative of -aminomalonate, -aspartate, and -glutamate) in combination with hexadecyltrimethylammonium bromide (HTAB) were investigated by surface tension, conductance, UV–vis absorption/emission spectroscopy, dynamic light scattering (DLS), and viscosity studies. Critical micelle concentration (CMC) values of the surfactant mixtures are significantly lower than the predicted values, indicating associative interaction between the components. Surface excess, limiting molecular area, surface pressure at the CMC, and Gibbs free energy indicate spontaneity of the micellization processes compared to the pure components. CMC values were also determined from the sigmoidal variation in the plot of micellar polarity and pyrene UV–vis absorption/emission intensities with surfactant concentration. The aggregation number, determined by static fluorescence quenching method, increases with decreasing mole fraction of the AAS (αAAS), where the micelles are mainly dominated by the HTAB molecules. The size of the micelle increases with decreasing αAAS, leading to the formation of larger and complex aggregates, as also supported by the viscosity studies. Micelles comprising 20–40 mol % AAS are highly viscous, in consonance with their sizes. Some of the mixed surfactant systems show unusual viscosity (shear thickening and increased viscosity with increasing temperature). Such mixed surfactant systems are considered to have potential in gel-based drug delivery and nanoparticle synthesis.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 35, no 47, p. 15306-15314
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
URN: urn:nbn:se:ltu:diva-76804DOI: 10.1021/acs.langmuir.9b02895ISI: 000500039900036PubMedID: 31689362Scopus ID: 2-s2.0-85075700091OAI: oai:DiVA.org:ltu-76804DiVA, id: diva2:1371969
Funder
Swedish Research Council Formas, 157142
Note

Validerad;2019;Nivå 2;2019-12-03 (johcin)

Available from: 2019-11-21 Created: 2019-11-21 Last updated: 2019-12-20Bibliographically approved

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