Limiting diffusion coefficients of ethoxylated surfactants of general formula CH3(CH2)p-1(OCH2CH2)qOH (CpEq) and sulfonate surfactants of formula CH3(CH2)p-1 SO3- 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.
Effect of chain length in ethoxylated and sulfonate surfactants upon the limiting diffusion coefficients in water at 25.0 °C / O., Ortona; D'Errico, Gerardino; D., Ciccarelli; V., Vitagliano. - In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS. - ISSN 1463-9076. - STAMPA. - 2:(2000), pp. 1961-1965. [10.1039/b000864h]
Effect of chain length in ethoxylated and sulfonate surfactants upon the limiting diffusion coefficients in water at 25.0 °C
D'ERRICO, GERARDINO;
2000
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-1 SO3- 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
