Spontaneous Expulsion of Giant Lipid Vesicles Induced by Laser Tweezers

Details Spontaneous Expulsion of Giant Lipid Vesicles Induced by Laser Tweezers Spontaneous Expulsion of Giant Lipid Vesicles Induced by Laser Tweezers

1996-10-08

arxiv.org/abs/cond-mat/9610070v1

Physics

Condensed Matter

Soft Condensed Matter

Plain TeX file; uses harvmac and epsf; .ps available at http://dept.physics.upenn.edu/~nelson/expulsion.ps

Scientific paper

Irradiation of a giant unilamellar lipid bilayer vesicle with a focused laser spot leads to a tense pressurized state which persists indefinitely after laser shutoff. If the vesicle contains another object it can then be gently and continuously expelled from the tense outer vesicle. Remarkably, the inner object can be almost as large as the parent vesicle; its volume is replaced during the exit process. We offer a qualitative theoretical model to explain these and related phenomena. The main hypothesis is that the laser trap pulls in lipid and ejects it in the form of submicron objects, whose osmotic activity then drives the expulsion.

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