ISSN:
1435-1536
Keywords:
Double layer interaction
;
swelling
;
lamellar phase
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 electrostatic contribution to the force across the apolar region in a lamellar liquid crystal is considered. For an ionic surfactant consisting of one small hydrophilic ion and one larger hydrophobic ion, a microscopic charge separation occurs. If the hydrophobic ion has a finite solubility in the apolar region a double layer force will be generated across the apolar region. It is shown that under realistic conditions this force can overcome the attractive van der Waals force and it is suggested that the extensive swelling of a lamellar phase in hydrocarbon, recently reported by Larché et al. [11] might be explained in terms of this double layer repulsion. It is also concluded that this type of double layer forces can be of important for the stability of microemulsions and water in oil emulsions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01191009
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