Caracterização físico-química de sistemas micelares
The process of adsorption and micellization of the surfactants sodium dodecyl sulfate, dodecylammonium chloride and hexaethylene glycol mono-n-dodecyl ether in water-air interface has been studied using measurements of surface tension in aqueous media and NaCl 0.1 mol/L in temperatures of 25, 33...
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| Format: | Dissertação |
| Sprog: | por |
| Udgivet: |
Universidade Federal do Rio Grande do Norte
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| Online adgang: | https://repositorio.ufrn.br/jspui/handle/123456789/19569 |
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| Summary: | The process of adsorption and micellization of the surfactants sodium dodecyl sulfate,
dodecylammonium chloride and hexaethylene glycol mono-n-dodecyl ether in water-air
interface has been studied using measurements of surface tension in aqueous media and NaCl
0.1 mol/L in temperatures of 25, 33 and 40 °C. From these data, critical micelle
concentrations and thermodynamic parameters of micellization and adsorption were
determined in order to elucidate the behaviors of micellization and adsorption for these
surfactants in the proposed medium. For the determination of the thermodynamic parameters
of adsorption we utilized the equations of isotherms of Langmuir and Gibbs. Γmáx values
determined by the different equations were correlated to the explanation of results.
Temperature and salinity were analyzed in terms of their influence on the micellization and
adsorption process, and the results were explained based on intermolecular interactions. The
values of Gmic have confirmed that the micelle formation for the surfactants studied occurs
spontaneously |
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