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Headgroup and hydrocarbon tail effects on the surface tension of sugar-based surfactant solutions
KTH, Superseded Departments, Chemistry.
KTH, Superseded Departments, Chemistry.
KTH, Superseded Departments, Chemistry.
2004 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 20, no 25, p. 10935-10942Article in journal (Refereed) Published
Abstract [en]

Measurements of surface tension isotherms were conducted for water solutions of pure and mixed n-decyl-beta-D-glucopyranoside (C-10-Glu) and n-deCyl-beta-D-maltopyranoside (C-10-Mal) surfactants. By applying the Gibbs surface tension equation, the surface densities of Glu and Mal were derived for different compositions and concentrations. The surface fractions were compared with theoretically calculated values where the headgroups were modeled as hard disks. Satisfactory agreement was found for hard-disk sizes of 22.9 and 11.3 Angstrom(2) in the case of a 1:1 mixture. The results of the hard-disk calculations were employed to estimate the configurational free energy of the n-decyl-hydrocarbon chain. The results obtained agree well with previous calculations for the n-dodecyl chain. Comparison with n-dodecyl beta-D-maltopyranoside (C-12-Mal) indicated a further contribution, with the longer hydrocarbon chain giving rise to a higher surface tension in good agreement with data for hydrocarbon liquids. Furthermore, the interpenetration of the headgroup into the hydrocarbon film was studied by means of comparing surface-tension data for n-decyl- and n-dodecyl-ethylene-oxide-based surfactants and n-decyl- and n-dodecyl-beta-D-thiomaltopyranosides (C-10-S-Mal and C-12-S-Mal, respectively) and -maltopyranosides. It was found that lengthening the tetra(etylene oxide) chain by one segment affects the surface tension only marginally, indicating little interpenetration of the additional ethylene-oxide group into the hydrocarbon film. For the thiomaltosides, however, the corresponding effect was found to be remarkably high.

Place, publisher, year, edition, pages
2004. Vol. 20, no 25, p. 10935-10942
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Chemical Sciences
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URN: urn:nbn:se:kth:diva-39719DOI: 10.1021/la048815zISI: 000225500700021Scopus ID: 2-s2.0-10444255456OAI: oai:DiVA.org:kth-39719DiVA, id: diva2:444702
Note

QC 20110929

Available from: 2011-09-29 Created: 2011-09-12 Last updated: 2017-12-08Bibliographically approved

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