| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9675528 | Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2005 | 5 Pages |
Abstract
Concentrated dispersions of soy lecithin (60Â g/L) prepared by sonication-freezing-unfreezing method show a non-newtonian behaviour and a significant rheopexy. Shear stress versus shear rate plots shows a loop hysteresis area, which have been studied in soy lecithin dispersions prepared with aqueous solutions of various electrolytes (NaCl, CaCl2, MgCl2 and AlCl3) with concentrations in the range 10â5 to 10â2Â mol/L. Also we have studied the effect of different pH on soy lecithin dispersions. The results have revealed a very sensitive influence of nature, valence and concentration of the respective cations and the pH value on the loop hysteresis area values. It seems to indicate that the vesicle formation by segregation process followed by vesicle fusions is involved in the rheopectic effect.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Colloid and Surface Chemistry
Authors
M. Manconi, J. Aparicio, D. Seyler, A.O. Vila, J. Figueruelo, F. Molina,