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Journal Articles EPL - Europhysics Letters Year : 2008

Nanotubes from gelly vesicles

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 >Uc) a tether is extruded and reaches a stationary length L ≃0U in a characteristic time 0. 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 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.
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Dates and versions

hal-00351648 , version 1 (09-01-2009)

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Annie Viallat, Clément Campillo, Brigitte Pepin-Donat, Françoise Brochard-Wyart, Sebastien Kremer. Nanotubes from gelly vesicles. EPL - Europhysics Letters, 2008, 82 (4), pp.48002. ⟨10.1209/0295-5075/82/48002⟩. ⟨hal-00351648⟩
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