Gravity-Induced Shape Transformations of Vesicles

Details Gravity-Induced Shape Transformations of Vesicles Gravity-Induced Shape Transformations of Vesicles

1995-09-28

arxiv.org/abs/cond-mat/9509174v1

Physics

Condensed Matter

11 pages, RevTeX, 3 Postscript figures uuencoded

Scientific paper

10.1209/0295-5075/32/5/009

We theoretically study the behavior of vesicles filled with a liquid of higher density than the surrounding medium, a technique frequently used in experiments. In the presence of gravity, these vesicles sink to the bottom of the container, and eventually adhere even on non - attractive substrates. The strong size-dependence of the gravitational energy makes large parts of the phase diagram accessible to experiments even for small density differences. For relatively large volume, non-axisymmetric bound shapes are explicitly calculated and shown to be stable. Osmotic deflation of such a vesicle leads back to axisymmetric shapes, and, finally, to a collapsed state of the vesicle.

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