Abstract
Limiting diffusion coefficients of ethoxylated surfactants of general formula CH3(CH2)p−1(OCH2CH2)qOH (CpEq) and sulfonate surfactants of formula CH3(CH2)p−1SO3− Na+(CpSO3Na) were measured at 25°C by the Taylor dispersion technique. The series C6Eq, with 0⩽q⩽5, was studied to evaluate the effect of the length of ethoxylic chain, (–OCH2CH2–)q, on the mobility of the surfactant, the series CpE5 with 0⩽p⩽8 was studied to evaluate the effect of the length of the hydrophobic group, (–CH2–)p. The series CpSO3Na was also studied to compare the experimental results with the intradiffusion coefficients obtained by the NMR-PGSE technique and with the data computed by the Nernst–Hartley equation.
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