ISSN:
1435-1536
Keywords:
Glycolipid
;
didodecyldimethylammonium bromide
;
phase diagram
;
concentration gradient
;
mixed micelles
;
critical demixion
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The ternary phase diagram of the water/2-O LauroylSaccharose (LS)/didodecyl dimethyl ammonium bromide (DDAB) is determined versus temperature using an extension of the gradient method. Three phase equilibria regions are localized. The existence of these phase equilibria is due to a combination of electrostatic effects and steric effects. The high surface charge density of the double chain surfactant (DDAB) and the large polar volume of the single chain added surfactant (LS) induce coexisting repulsive mechanisms of steric and electrostatic origin which are directly measured using vapor pressure experiments. Critical demixtion of two lamellar phases formerly observed by temperature variation, can also be induced by adding LS.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01188977
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