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∞ τ0U in a characteristic time τ0. 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 τ0 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.
Keywords : Membranes bilayers
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Journal articles
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Submitted on : Wednesday, June 5, 2019 - 11:37:03 AM
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S. Kremer, Clément Campillo, B. Pepin-Donat, A. Viallat, F. Brochard-Wyart. Nanotubes from gelly vesicles. EPL - Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2008, 82 (4), pp.48002. ⟨10.1209/0295-5075/82/48002⟩. ⟨hal-02148071⟩

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