کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
216096 | 1426263 | 2012 | 5 صفحه PDF | دانلود رایگان |
Mutual diffusion coefficients of alkane-1,n-bis(trimethylammonium bromide), CnMe6Br2 (n = 8, 10, 12), surfactants have been measured using the Taylor dispersion technique, at T = 298.15 K, at concentrations from (0.000 to 0.0380) mol · dm−3. The dependence of mutual diffusion coefficients on the concentration has been discussed in the framework of Onsager–Fuoss and Pikal models. On the basis of this discussion, it is suggested that these surfactants behave as associated electrolytes. From limiting mutual diffusion coefficient values, extrapolated from experimental values for c → 0, limiting ionic conductance, tracer diffusion coefficients, and hydration radii of alkane-1,n-bistrymethyl ammonium ions have been estimated. For the case of dodecane-1,12-bis(trimethylammonium bromide), no aggregation has been noticed up to 0.04 mol · dm−3.
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► Mutual diffusion coefficients of bolaform surfactants have been measured.
► Diffusion coefficients are dependent on the alkyl chain length of surfactants.
► Bolaform surfactants act as associated electrolytes.
► Ion–ion association increases by decreasing the surfactant alkyl chain length.
Journal: The Journal of Chemical Thermodynamics - Volume 50, July 2012, Pages 89–93