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SANS study of alkyl polyoxyethylene sulfate micelles. Sodium dodecyl(oxyethylene)4sulfate in D2O at 25°C

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Abstract

n-C 12 H 25 (OC 2 H 4 ) 4 SO 4 Na micelles have been investigated by small angle neutron scattering technique. Results have been obtained for a series of solutions of variable concentration of surfactant and for an approximately 0.07M solution to which different amounts of NaCl were added. Micellar parameters, aggregation number, and apparent charge have been compared to those previously obtained for C 12 H 25 (OC 2 H 4 ) 4 SO 4 Na. On changing the surfactant concentration, the growth gradient of micelles of the latter is similar to the growth gradient of micelles of C 12 H 25 (OC 2 H 4 ) 4 SO 4 Na when no excess salt is present. In the presence of added electrolyte, C 12 H 25 (OC 2 H 4 ) 2 SO 4 has a higher growth gradient than C 12 H 25 (OC 2 H 4 ) 4 SO 4 . This result has been interpreted in terms of effect of the oxyethylene group. The monodisperse core+shell spherical model of micellar structure previously proposed for this class of surfactant seems to hold in a wide range of concentrations of surfactant and/or added electrolyte.

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Authors and Affiliations

  1. Istituto Chimica Fisica, 26 V. Archirafi, 90123, Palermo, Italy

    R. Triolo & E. Caponetti

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  1. R. Triolo
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  2. E. Caponetti
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Triolo, R., Caponetti, E. SANS study of alkyl polyoxyethylene sulfate micelles. Sodium dodecyl(oxyethylene)4sulfate in D2O at 25°C. J Solution Chem 15, 377–386 (1986). https://doi.org/10.1007/BF00646260

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  • DOI: https://doi.org/10.1007/BF00646260

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