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The concentration of bromide ion was measured by an ion electrode method and a titration for the stirred and sonicated aqueous solution of didodecyl-, ditetradecyl-, and dihexadecyl-dimethylammonium bromides. The observed bromide concentration, combined with the surface tension and the molar conductivity, was correlated to the forms of the aggregates in the solution. And the stability of the aggregates was also estimated.

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