Characterization of liquid crystals by optical microscopy in polyethoxylated surfactant-alkane-water systems

Química Nova

Chávez, Gerson¹  Luzardo, Milangel¹  Parra, Irán¹  Márquez, Nelson¹  Universidad del Zulia, Maracaibo, Venezuela¹  Bravo, Bélgica¹ 

关键词: optical microscopy;    liquid crystal;    alcohol polyethoxylated.;   

DOI  :  10.1590/S0100-40422013000900011

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

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.

【 授权许可】

Unknown