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Surface tensiometry study of the interfacial phenomena in the mixed surfactant solutions of sodium di-2-ethylhexylsulfosuccinate (AOT) and hexadecyl benzylammonium chloride (HDBAC)

Maab K. Omer, Inaam H. Ali, and Sameer H. Kareem

College of Science for Women, University of Baghdad, Baghdad, Iraq



Received: 11 April 2022  Accepted: 4 August 2022


Surface behavior and interfacial mixing properties of the cationic surfactant hexadecyl benzylammonium chloride (HDBAC) and anionic one sodium di-2-ethylhexylsulfosuccinate (AOT) were studied at four temperatures (288–318 K) in an aqueous solution using tensiometry method. The critical micelle concentration (CMC) for individual and binary mixture was evaluated to gain the interfacial parameters such as surface excess concentration, minimum area per molecules of single and mixture system, and interfacial free energy. The results show expansion of minimum area per molecules of binary mixture (about 1000–2500 Å2) compared with that of single surfactants (about 100–250 Å2). Based on Rosen’s model, the synergism parameters were calculated and the data obtained show that negative values of molecular interaction parameter (\(\beta^{\sigma }\) ) indicate an attractive interaction between the surfactants, where the more negative value was − 7.63146 for the mixture of 90% AOT and 10% HDBAC. Also, the values of activity coefficients less than unity indicate a strong synergistic interaction between the two surfactants.

Keywords: Sodium di-2-ethylhexylsulfosuccinate (AOT); Hexadecyl benzylammonium chloride (HDBAC); Tensiometry; Interfacial properties

Full paper is available at

DOI: 10.1007/s11696-022-02413-8


Chemical Papers 76 (11) 7189–7193 (2022)

Monday, April 22, 2024

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