Caracterización de cristales líquidos por microscopía óptica en sistemas surfactante polietoxilado-alcano-agua

The phase behavior of an alcohol polyethoxylated surfactant with decane and dodecane oil phase varying the water proportion from 5 to 90% to determine compositions in which the formation of liquid crystals and microemulsions ocurred was investigated. Pseudoternary phase diagrams were built to repres...

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Bibliographic Details
Published in:Química Nova 2013, Vol.36 (9), p.1343-1347
Main Authors: Chávez, Gerson, Parra, Irán, Luzardo, Milangel, Bravo, Bélgica, Márquez, Nelson
Format: Article
Language:English
Subjects:
alcohol polyethoxylated
liquid crystal
optical microscopy
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Summary:The phase behavior of an alcohol polyethoxylated surfactant with decane and dodecane oil phase varying the water proportion from 5 to 90% to determine compositions in which the formation of liquid crystals and microemulsions ocurred was investigated. Pseudoternary phase diagrams were built to represent the regions of liquid crystals, biphases and microemulsions. Polarized light optical microscopy was used for the analysis and characterization of the separate phases. The micrographs obtained showed characteristics of hexagonal and lamellar phases of liquid crystal, isotropic phases, microemulsions and vesicles. This study is important to propose hypothesis regarding the factors determining the formation and stability of phases composed by surfactant/oil/water systems.
ISSN:0100-4042
1678-7064
DOI:10.1590/S0100-40422013000900011