Role of partitioning site in producing viscoelasticity in micellar solutions

The effect of the addition of four aromatic compounds (anthranilic acid, benzoic acid, sodium anthranilate, and sodium benzoate) to 10 mM cetyltrimethylammonium bromide solutions is investigated by 1H nuclear magnetic resonance spectroscopy. The site of solubilization of these molecules inside the m...

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Bibliographic Details
Published in:Journal of surfactants and detergents 2005-07, Vol.8 (3), p.247-252
Main Authors: Kumar, Sanjeev, Sharma, Damyanti, Kabir‐ud‐Din
Format: Article
Language:English
Subjects:
1H NMR study
Acids
Anthranilic acid
Aromatic compounds
Benzene
benzoic acid
cetyltrimethylammonium bromide
micelles
NMR
Nuclear magnetic resonance
Sodium
sodium anthranilate
sodium benzoate
Solution chemistry
Surfactants
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Summary:The effect of the addition of four aromatic compounds (anthranilic acid, benzoic acid, sodium anthranilate, and sodium benzoate) to 10 mM cetyltrimethylammonium bromide solutions is investigated by 1H nuclear magnetic resonance spectroscopy. The site of solubilization of these molecules inside the micelle is inferred. It is shown that sodium anthranilate, which partitions near the head group region together with the external part of the micellar palisade layer (in Rosen's terminology), is most effective in producing micellar growth (or viscoelasticity). In this context a deeper penetration of an additive inside the micelle disqualifies it to produce viscoelasticity in the system. Furthermore, interior or palisade region solubilization depends on the nature of groups attached to the main benzene ring.
ISSN:1097-3958
1558-9293
DOI:10.1007/s11743-005-0353-3