Summary
Surface tension, electrical conductivity, light scattering and nuclear magnetic resonance measurements were carried out in aqueous solutions of a series of ω-phenylalkyltrimethylammonium bromides. The conclusion is summarized as follows.
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1)
The pentyl and higher homologs form micelles in aqueous solutions, provided the concentration is larger than a definite value (CMC). As expected, CMC decreases and association number of a micelle increases with an increase in the alkyl-chain length.
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2)
The butyl derivative does not form large aggregates that are qualified to be called “micelles”. No distinct CMC is observed.
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3)
In a micellar solution, surfactant molecules are rapidly exchanged between micelles and bulk water phase.
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4)
Critical micelle concentration is affected by the introduction of a phenyl group at the end of an alkyl chain in such a manner as if 2.7 methylene groups were introduced.
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Nakagawa, T., Inoue, H., Jizomoto, H. et al. Colloid-chemical properties of ω-phenylalkyltrimethylammonium bromides in aqueous solutions. Kolloid-Z.u.Z.Polymere 229, 159–166 (1969). https://doi.org/10.1007/BF01552711
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DOI: https://doi.org/10.1007/BF01552711