Comparative Analysis of Electrical Conductivity and Tensiometry Methods for Measuring Critical Micelle Concentration (CMC) of Surfactants CAHS and SDS: Impact of Water Type on CMC Measurements
Résumé
Surfactant foams play a crucial role in different operations in porous media, like soil remediation. Surfactants have the ability to reduce the surface tension between two immiscible phases, such as oil and water, and act as major foaming agents [1]. This work is part of the ANR project BBFOAM aiming to characterize the foam flow in a porous medium, in the presence of pollutants. For surfactant analysis, determining the critical micelle concentration (CMC) is of paramount importance. The CMC is the concentration at which surfactant molecules begin to self-assemble and form micelles, which significantly affect their surface tension and electrical properties [2]. In this study, we assess two commonly used methods for measuring the CMC of surfactants: conductimetry (electrical conductivity measurement), and tensiometry (surface tension measurements) [3]. Two different types of water: tap, and deionized water, used in laboratory and field applications were employed to investigate the influence of water type on CMC measurements. Two types of surfactants were used: Sodium Dodecyl Sulfate (SDS), an anionic surfactant, and Cocamidopropyl hydroxysultaine (CAHS), a zwitterionic surfactant.
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