Nanotubes from gelly vesicles

S. Kremer; C. Campillo; B. Pepin-Donat; A. Viallat; F. Brochard-Wyart

doi:10.1209/0295-5075/82/48002

All issues

Volume 82 / No 4 (May 2008)

EPL, 82 4 (2008) 48002

Abstract

Issue		EPL Volume 82, Number 4, May 2008


Article Number		48002
Number of page(s)		5
Section		Interdisciplinary Physics and Related Areas of Science and Technology
DOI		https://doi.org/10.1209/0295-5075/82/48002
Published online		06 May 2008

EPL, 82 (2008) 48002

Nanotubes from gelly vesicles

S. Kremer¹, C. Campillo², B. Pepin-Donat², A. Viallat³ and F. Brochard-Wyart¹

¹ 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

Corresponding authors: sebastien.kremer@curie.fr brigitte.pepin-donat@cea.fr brochard@curie.fr

Received: 26 December 2007
Accepted: 25 March 2008

Abstract

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 > U_c) a tether is extruded and reaches a stationary length L $_{\infty}$ $\simeq \tau_{0}U$ in a characteristic time $\tau_{0}$ . The vesicle behaves like an entropic spring with a tether length L $_{\infty}$ proportional to the Stokes friction force. Compared to viscous “sol" vesicles, gelly vesicle are much stiffer: L $_{\infty}$ and $\tau _{0}$ 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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