Electrostatic Repulsion of Positively Charged Vesicles and Negatively Charged Objects-Reference-Cited by-同舟云学术

Electrostatic Repulsion of Positively Charged Vesicles and Negatively Charged Objects

Published:1999-07-16 Issue:5426 Volume:285 Page:394-397
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Aranda-Espinoza Helim¹,Chen Yi²,Dan Nily¹,Lubensky T. C.²,Nelson Philip²,Ramos Laurence³,Weitz D. A.²

Affiliation:

1. Department of Chemical Engineering, University of Delaware, Newark, DE 19716, USA.

2. Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104 USA.

3. Groupe de Dynamique des Phases Condensées, Case 26, Université de Montpellier II, Place E. Bataillon, 34095 Montpellier Cedex 05, France.

Abstract

A positively charged, mixed bilayer vesicle in the presence of negatively charged surfaces (for example, colloidal particles) can spontaneously partition into an adhesion zone of definite area and another zone that repels additional negative objects. Although the membrane itself has nonnegative charge in the repulsive zone, negative counterions on the interior of the vesicle spontaneously aggregate there and present a net negative charge to the exterior. Beyond the fundamental result that oppositely charged objects can repel, this mechanism helps to explain recent experiments on surfactant vesicles.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference17 articles.

1. S. A. Safran Statistical Thermodynamics of Surfaces Interfaces and Membranes (Addison-Wesley Reading MA 1994).

2. Nardi J., Bruinsma R., Sackmann E., Phys. Rev. E 58, 6340 (1998).

3. L. Ramos T. C. Lubensky N. Dan P. Nelson D. A. Weitz unpublished results.

4. Changes in the materials used had little effect on the experimental results in (3). We used colloidal spheres of diameters 0.98 0.83 and 1.00 μm with sulfate groups sulfate and carboxylate groups and carboxylate and amine groups respectively. Electrophoretic velocity measurements confirmed that all types of particles were negatively charged in our experimental conditions. All three samples behaved similarly in the experiments. We also varied the bilayer characteristics through the addition of octanol. Although this co-surfactant is known to alter the curvature-elasticity properties of bilayers we could not see any qualitative effect on our results at alcohol-to-Triton-X weight ratios ranging from 0 to 0.7. In Fig. 1 the weight ratio DDAB (didodecyl dimethyl ammonium bromide):Triton:octanol was 1:0.37:0.13. The buffer solution contained NaCl at concentrations from 1 to 10 mM as discussed below.

5. R. B. Gennis Biomembranes (Springer-Verlag New York 1989).

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