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Surface and thermodynamic properties of octyl, dodecyl, and cetyl sulfoacetates

Thermodynamik und Oberflächeneigenschaften von Octyl-, Dodecyl- und Cetylsulfoacetaten

  • Anorganische Und Physikalische Chemie
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Summary

Three anionic surfactants (Na-octysulfoacetate (A 8), Na-dodecylsulfoacetate (A 12), and Na-cetylsulfoacetate (A 16) were prepared from alkyl bromoacetate. Several studies were carried out with aqueous surfactant solutions including surface tension, and electrical conductivity measurements. Surface properties, in particular, critical micelle concentration (CMC), effectiveness (∏ CMC ), efficiency (P c20), maximum surface excess (γmax), and minimum surface area (A min) were investigated at different concentrations at 20, 35 and 50°C, respectively. Free energies, enthalpies, entropies of micellization, and adsorption of the surfactants in the aqueous solution were studied.

Zusammenfassung

Drei anionische Tenside (Na-Octylsulfoacetat (A 8), Na-Dodecylsulfoacetat (A 12) und Na-Cetylsulfoacetat (A 16)) wurden aus Bromessigsäurealkylestern hergestellt. An wäßrigen Lösungen der Tenside wurden deren Oberflächenspannung und elektrische Leitfähigkeit gemessen. Oberflächeneigenschaften, insbesondere kritische Micellenkonzentration (MCC), Effektivität (∏ CMC ), Effizienz (P c20) maximaler Oberflächenüberschuß (γmax) und minimale Oberfläche (A min) wurden bei verschiedenen Konzentrationen und bei Temperaturen von 20, 35 und 50°C untersucht. Die freien Energien, Enthalpien, Entropien und die Adsorption der Tenside in wäßriger Lösung wurden bestimmt.

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Authors and Affiliations

  1. Egyptian Petroleum Research Institute, Nasr City, Cairo, Egypt

    E. A. M. Gad, M. M. A. El-Sukkary & E. M. S. Azzam

Authors
  1. E. A. M. Gad
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  2. M. M. A. El-Sukkary
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  3. E. M. S. Azzam
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Gad, E.A.M., El-Sukkary, M.M.A. & Azzam, E.M.S. Surface and thermodynamic properties of octyl, dodecyl, and cetyl sulfoacetates. Monatsh Chem 128, 1085–1092 (1997). https://doi.org/10.1007/BF00807558

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  • DOI: https://doi.org/10.1007/BF00807558

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