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Previous issue date: 2014-07-23 / Os processos de miceliza??o e adsor??o dos tensoativos dodecil sulfato de s?dio, cloreto de
dodecilam?nio e hexaetileno glicol mono-n-dodecil ?ter em interface l?quido-g?s foram
estudados a partir de medidas de tens?o superficial em meio aquoso e em NaCl 0,1 mol/L em
temperaturas de 25, 33 e 40 ?C. A partir destes dados, a concentra??o micelar cr?tica e
par?metros termodin?micos de miceliza??o e adsor??o foram determinados, a fim de elucidar
os comportamentos de miceliza??o e adsor??o para esses tensoativos nos meios propostos.
Para a determina??o dos par?metros termodin?micos de adsor??o, foram utilizadas as
equa??es das isotermas de Gibbs e de Langmuir. Os valores de ?m?x determinados pelas
diferentes equa??es foram correlacionados para a explica??o dos resultados. A temperatura e
salinidade foram analisadas quanto ?s suas influ?ncias no processo de miceliza??o e adsor??o,
e os resultados foram explicados baseados nas intera??es intermoleculares. Os valores de
?Gmic confirmaram que a forma??o micelar para os tensoativos estudados ocorre
espontaneamente / 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. ?m?x 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
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/19569 |
| Date | 23 July 2014 |
| Creators | Silva, Gustavo Thalmer de Medeiros |
| Contributors | 00738841463, http://lattes.cnpq.br/4789528535524269, Fonseca, Jos? Lu?s Cardozo, 90623207753, http://lattes.cnpq.br/8143800826985556, Oliveira, M?nica Rodrigues de, 02703929471, http://lattes.cnpq.br/2219717055055892, Wanderley Neto, Alcides de Oliveira |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM QU?MICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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