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Phase behaviour of the dioctadecyldimethylammonium bromide-water system
Authors:P. C. Schulz  J. L. Rodríguez  F. A. Soltero-Martínez  J. E. Puig  Z. E. Proverbio
Affiliation:1. Departamento de Química e Ingeniería Química, Universidad Nacional del Sur, Bahía Blanca, Argentina
2. Departamento de Ingenierá Química, Centro Universitario de Cíencias e Ingenierías, Universidad de Guadalajara, Guadalajara, Jelisco, México
Abstract:The phase behaviour of the twin-tailed surfactant dioctadecyldimethylammonium bromide with water was studied by DSC, FT-IR, X-ray and polarizing microscope. The phase diagram of DODAB-water system is very similar to that of DODAC-water. The dihydrate is in equilibrium with isotropic solution below 55°C. Above this temperature there is a lamellar liquid crystalline region, in equilibrium with isotropic liquid and solid crystals of DODAB·2H2O, up to 69°C. From 69 to 86°C, the lamellar mesophase is in equilibrium with ‘waxy’ anhydrous DODAB. From 86 to 116°C and very high DODAB content, there is a very narrow region of existence of inverse hexagonal mesophase, in equilibrium via a narrow biphase region with lamellar mesophase. AtT > 116°C an isotropic liquid appears. There seems to exist two different lamellar mesophases, one of them between 10 and 40 wt.% DODAB and the other between 60 and about 97 wt.% DODAB, with a biphase zone between them.
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