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Limitations in the use of surface tension and the Gibbs equation to determine surface excesses of cationic surfactants.

Abstract:

Neutron reflection (NR) and surface tension (ST) are used to show that there are serious limitations in applying the Gibbs equation accurately to ST data of cationic surfactants to obtain the limiting surface excess, Γ(CMC), at the critical micelle concentration (CMC). Nonionic impurities in C12TABr and C16TABr have been eliminated by extensive purification to give ST - ln(concentration) (σ - ln c) curves that are convex with respect to the ln c axis around the CMC, which is characteristic of...

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Publication status:
Published

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Publisher copy:
10.1021/la501287v

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Institution:
University of Oxford
Department:
Oxford, MPLS, Chemistry, Physical and Theoretical Chem
Role:
Author
Publisher:
American Chemical Society
Journal:
Langmuir : the ACS journal of surfaces and colloids
Volume:
30
Issue:
23
Pages:
6739-6747
Publication date:
2014-06-05
DOI:
EISSN:
1520-5827
ISSN:
0743-7463
URN:
uuid:41c9a062-b628-4eaa-9a9c-abab604af467
Source identifiers:
469512
Local pid:
pubs:469512
Language:
English

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