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Adsorption of Equimolar Mixtures of Cationic and Anionic Surfactants at the Water/Hexane Interface

Mucic, Nenad ; Skrbic, Jelena ; Bucko, Sandra ; Petrovic, Lidija ; Katona, Jaroslav ; Fainerman, Valentin B. ; Aksenenko, Eugene V. ; Schneck, Emanuel ; Miller, Reinhard (2022):
Adsorption of Equimolar Mixtures of Cationic and Anionic Surfactants at the Water/Hexane Interface. (Publisher's Version)
In: Colloids and Interfaces, 5 (1), MDPI, e-ISSN 2504-5377,
DOI: 10.26083/tuprints-00017459,
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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: Adsorption of Equimolar Mixtures of Cationic and Anionic Surfactants at the Water/Hexane Interface
Language: English
Abstract:

In mixed solutions of anionic and cationic surfactants, called catanionics, ion pairs are formed which behave like non-ionic surfactants with a much higher surface activity than the single components. In equimolar mixtures of NaCnSO4 and CmTAB, all surface-active ions are paired. For mixtures with n + m = const, the interfacial properties are rather similar. Catanionics containing one long-chain surfactant and one surfactant with medium chain length exhibit a strong increase in surface activity as compared with the single compounds. In contrast, catanionics of one mediumand one short chain surfactant have a surface activity similar to that of the medium-chain surfactant alone. Both the Frumkin model and the reorientation model describe the experimental equilibrium data equally well, while the adsorption kinetics of the mixed medium- and short-chain surfactants can be well described only with the reorientation model.

Journal or Publication Title: Colloids and Interfaces
Journal volume: 5
Issue Number: 1
Publisher: MDPI
Collation: 16 Seiten
Uncontrolled Keywords: surfactant adsorption, catanionic surfactants, water/hexane interface, interfacial tension, drop profile analysis tensiometry, effect of alkyl chain length, thermodynamic model
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
500 Naturwissenschaften und Mathematik > 540 Chemie
600 Technik, Medizin, angewandte Wissenschaften > 600 Technik
Divisions: 05 Department of Physics > Institute for Condensed Matter Physics
Date Deposited: 04 Feb 2022 14:40
Last Modified: 02 May 2022 12:07
DOI: 10.26083/tuprints-00017459
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-174592
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/17459
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