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Related Experiment Videos

Electromechanical limits of polymersomes.

H Aranda-Espinoza1, H Bermudez, F S Bates

  • 1Institute for Medicine and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

Physical Review Letters
|November 3, 2001
PubMed
Summary

Diblock copolymer membranes show higher breakdown voltage than lipid membranes, despite differences in thickness. Their electromechanical stress and capacitance align with thermodynamic models, revealing viscous dynamics.

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Area of Science:

  • Materials Science
  • Biophysics
  • Polymer Science

Background:

  • Amphiphilic diblock copolymers self-assemble into polymersomes, mimicking lipid bilayers.
  • Understanding membrane cohesiveness is crucial for applications in drug delivery and biomaterials.

Purpose of the Study:

  • To compare the electromechanical properties and breakdown behavior of diblock copolymer membranes with lipid membranes.
  • To investigate the influence of hydrophobic thickness on membrane capacitance and breakdown potential.
  • To analyze the mechanical response and dynamics of polymersomes post-electroporation.

Main Methods:

  • Fabrication of polymersomes and liposomes with varying hydrophobic thicknesses (d = 3-15 nm).
  • Electromechanical breakdown measurements to determine breakdown potential (V(c)).

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  • Capacitance measurements to assess membrane dielectric properties.
  • Analysis of post-poration dynamics to evaluate membrane viscosity.

    • Main Results:

    • Polymersomes (d = 15 nm) exhibited a breakdown potential of 9 V, significantly higher than liposomes (d = 3 nm) at 1 V.
    • Electromechanical stress at breakdown followed a universal V(c)(2) dependence for both membrane types.
    • Membrane capacitance strongly correlated with hydrophobic thickness (d), consistent with thermodynamic models.
    • Diblock copolymer membranes displayed viscous behavior during post-electroporation recovery.

    Conclusions:

    • Diblock copolymer membranes offer tunable mechanical properties and enhanced robustness compared to lipid membranes.
    • Simple thermodynamic models effectively describe the capacitance and breakdown behavior of these synthetic membranes.
    • The inherent viscosity of polymersomes influences their response to electrical stress and recovery dynamics.