Collect. Czech. Chem. Commun. 1980, 45, 210-213

Determination of critical micelle concentration of 1-carbethoxypentadecyltrimethylammonium bromide

Ludmila Čermáková, Jitka Rosendorfová and Miroslav Malát

Department of Analytical Chemistry, Charles University, 128 40 Prague 2


The critical concentration of 1-carbethoxypentadecyltrimethylammonium bromide, cc = 7.7.10-4 mol l-1, was determined from surface tension measurements by using the method of the maximum bubble pressure. The cc value decreases markedly if a strong electrolyte (NaCl, NaNO3) is added even in very low quantities; further increase of the electrolyte concentration - 0.1 to 1.0 mol l-1 - does not bring about appreciable additional changes of cc.