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Binding of Ca 2+ Ions to Alkylbenzene Sulfonates: Micelle Formation, Second Critical Concentration and Precipitation
Ist Teil von
Materials, 2023-01, Vol.16 (2)
Ort / Verlag
Switzerland
Erscheinungsjahr
2023
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
Anionic surfactants, such as sodium linear alkylbenzene sulfonates (NaLAS), are utilized in various fields, including industry, household, and agriculture. The efficiency of their use in aqueous environments is significantly affected by the presence of cations, Ca
and Mg
in particular, as they can decrease the concentration of the surfactant due to precipitation. To understand cation-sulfonate interactions better, we study both NaLAS colloidal solutions in the presence of CaCl
and precipitates forming at higher salt concentrations. Upon addition of CaCl
, we find the surface tension and critical micelle concentration of NaLAS to decrease significantly, in line with earlier findings for alkylbenzylsulfonates in the presence of divalent cations. Strikingly, an increase in the surface tension is discernible above 0.6 g L
NaLAS, accompanied by the decrease of apparent micelle sizes, which in turn gives rise to transparent systems. Thus, there appears to be a second critical concentration indicating another micellar equilibrium. Furthermore, the maximum salt tolerance of the surfactant is 0.1 g L
Ca
, above which rapid precipitation occurs yielding sparingly soluble CaLAS
∙2H
O.
Sprache
Englisch
Identifikatoren
ISSN: 1996-1944
eISSN: 1996-1944
Titel-ID: cdi_pubmed_primary_36676235
Format
–
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