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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/5276

Title: Nonlinear Dynamics of Lipid Films under Electric Forces
Other Titles: Journal of Colloid and Interface Science
Authors: Porto, Celia Beatriz Anteneodo de
Bisch, Paulo Mascarello
Pinto, Nice Maria Americano da Costa Costa
Souza, Elias Ramos de
Keywords: lipid bilayer;film stability;transmembrane electric potential
Issue Date: 1997
Abstract: We study the dynamics and rupture of lipid films perturbed in the symmetric mode squeezing through an electrohydrodynamical approach. The lipid phase and the two surrounding aqueous phases are considered as incompressible Newtonian viscous fluids submitted to van der Waals, steric, and electric body forces. A nonlinear evolution equation for the film thickness, at the long-wavelength limit, is obtained for two symmetric cases: a film with equally charged surfaces with no potential drop and a neutral film submitted to an external electric field. At the long-wavelength limit, the electric term only influences the film evolution when the electric field inside the film is nonvanishing. We solve numerically, as an initial value problem with periodic boundary conditions, the nonlinear evolution equation. The rupture time is obtained and compared with analytical estimates. Sufficiently strong steric forces prevent the film from narrowing beyond a minimum thickness leading the film to a steady state different from the planar one consistently with the nonlinear analytical approach. The presence of a transmembrane electric potential destabilizes the perturbed film as predicted by the linear and nonlinear approaches; however, as expected, destabilization is not relevant at physiological values of the potential drop.
Description: p. 313-326
URI: http://www.repositorio.ufba.br/ri/handle/ri/5276
ISSN: 0021-9797
Appears in Collections:Artigos Publicados em Periódicos (FIS)

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