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Polymer-like Structure of Lecithin Reverse Micelles in the Lecithin+water+cyclohexane System by Mika Kanamaru; Yoshiyuki Einaga is a Materials Science article available to read on EtoBox.

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The lecithin reverse micelles with and without containing water in cyclohexane at 25.0 8C were characterized by static (SLS) and dynamic light scattering (DLS) experiments. The molar mass M 0 and hydrodynamic radius R 0 H of the micelle determined at in®nite dilution have increased with increasing water content W 0 , demonstrating that the micelles grow in mass and in size with water uptake into them. The values of R 0 H as a function of M 0 have been successfully analyzed with the use of the wormlike spherocylinder model. The results have revealed that the micelles with containing water assume a shape of rather ̄exible cylinders with the stiffness parameter l 21 11:0 nm and the crosssectional diameter d 5:2 nm: It is also found that the intermolecular distance between hydrophobic tails of two adjacent lecithin molecules on the micellar surface is about 1.2 nm without regard to water content W 0 . The micellar growth with increasing lecithin concentration has also been found to occur accompanying the structural evolution by combining information from SLS and DLS results.

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Author

Mika Kanamaru; Yoshiyuki Einaga

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0032-3861)

Published

2002

Language

EN

Field

Materials Science (Physical Sciences)