Volume 82, Number 4, May 2008
|Number of page(s)||5|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||06 May 2008|
Nanotubes from gelly vesicles
Laboratoire PCC Institut Curie, CNRS UMR 168, University Paris 6 - 75231 Paris Cedex 05, France, EU
2 Laboratoire Electronique Molculaire Organique et Hybride, UMR 5819 SPrAM (CEA-CNRS-UJF), DRFMC, CEA-Grenoble - 38054 Grenoble Cedex 9, France, EU
3 Laboratoire Adhèsion et Inflammation, U 600 CNRS-INSERM - Luminy, France, EU
Accepted: 25 March 2008
Hydrodynamic extrusions of tethers from giant unilamellar vesicles (GUV) enclosing a poly-N-isopropylacrylamide (polyNIPAM) gel are studied. The collapse of the gel upon heating induces a deswelling of the GUV, showing that the membrane is linked to the polymer network. The gelly vesicle is attached to a micro-rod and submitted to a flow (velocity U). Above a threshold velocity (U > Uc) a tether is extruded and reaches a stationary length L in a characteristic time . The vesicle behaves like an entropic spring with a tether length L proportional to the Stokes friction force. Compared to viscous “sol" vesicles, gelly vesicle are much stiffer: L and being hundred times smaller. We conclude that the mobility of lipids is reduced, only a small portion of the vesicle area being free to flow into the tube.
PACS: 87.16.D- – Membranes, bilayers, and vesicles / 82.70.Gg – Gels and sols / 83.50.Ha – Flow in channels
© EPLA, 2008
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