A self-diffusion study of poly(ethylene-oxide) alkyl alcohols |
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Authors: | L Ambrosone L Costantino G D’Errico V Vitagliano |
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Institution: | (1) DISTAAM Facoltà di Agraria, Università del Molise, via Tiberio 21/A, 86100 Campobasso, Italy;(2) Dipartimento di Chimica, Università Federico II, via Mezzocannone 4, 80134 Napoli, Italy |
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Abstract: | The self-diffusion coefficients of HDO and some surfactants in aqueous mixtures at different concentrations, below the critical
micelle concentration, have been determined by means of the NMR, spin-echo pulsed field gradient method. The surfactant solutes
chosen were ethylene glycol-pentyl alcohol (diethylene glycolpentylalcohol, ethylene glycol-hexyalcohol, diethylene glycol-hexyl
alcohol, triethylene glycol-hexyl alcohol, tetraethylene glycol-hexyl alcohol, pentaethylene glycol-hexyl alcohol). The interactions
in solution are studied by analyzing the solute self-diffusion coefficients extrapolated to infinite dilution. These values
are compared with those of 1-alkanols. The slope of the self diffusion coefficientsvs. the solute concentration are correlated with the microscopic friction coefficients. A model for interpreting the experimental
data is suggested. |
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Keywords: | Nonionic surfactants aqueous mixture self-diffusion |
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