Electromechanical Limits of Polymersomes

Details Electromechanical Limits of Polymersomes Electromechanical Limits of Polymersomes

2001-07-02

arxiv.org/abs/cond-mat/0107039v1

Physics

Condensed Matter

Soft Condensed Matter

13 pages, 4 figures, 2 tables and 1 chair. Submitted to PRL (May 24, 2001)

Scientific paper

10.1103/PhysRevLett.87.208301

Self-assembled membranes of amphiphilic diblock copolymers enable comparisons of cohesiveness with lipid membranes over the range of hydrophobic thicknesses d=3-15 nm. At zero mechanical tension the breakdown potential V_c for polymersomes with d=15 nm is 9 V compared to 1 V for liposomes with d=3 nm. Nonetheless, electromechanical stresses at breakdown universally exhibit a square dependence on V_c, and membrane capacitance shows the expected strong d-dependence, conforming to simple thermodynamic models. The viscous nature of the diblock membranes is apparent in the protracted post-poration dynamics.

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