Free vertical growth of myelin figures

Citation
I. Sakurai et al., Free vertical growth of myelin figures, MOLEC CRYST, 363, 2001, pp. 157
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Volume
363
Year of publication
2001
Database
ISI
SICI code
Abstract
Myelin figures which grow from a floating egg-yolk lecithin lump on a surfa ce of water/glycerin mixture have been found to grow only vertically toward s the bottom of a glass cell and never to grow horizontally along the mediu m surface nor radially. The structure of the growing myelin figures is basi cally simple rod-like or a bundle of a few simple rods. Helixing, twisting or coiling myelin figures were never observed under the present experimenta l condition. Taking the results obtained from the reported growth behaviour of myelin fi gures into consideration, it is proposed that one of the driving forces of helixing, coiling and twisting growth of myelin figures is thought to be du e to a chemical potential difference caused by a concentration gradient alo ng the radial direction perpendicular to the long axis of a myelin figure. The hydrocarbon chains in the fully hydrated stacked bilayer of myelin figu res are proposed to be in a more ordered state than reported so far. The ar rangement of hydrocarbon chains, both in myelin figures and in an egg-yolk lecithin/water complex, and the density of them also will be discussed.