Rheology of giant vesicles: a micropipette study.

  title={Rheology of giant vesicles: a micropipette study.},
  author={Nathalie Fa and Carlos Manuel Marques and Eduardo Mendes and A P Schr{\"o}der},
  journal={Physical review letters},
  volume={92 10},
We develop a micropipette rheometer to study the effect of oscillatory shear flow on the spontaneous fluctuations of phospholipid bilayers. Our results on giant vesicles show that oscillatory shear flow leads to a suppression of membrane fluctuations. They also imply that the Helfrich equation is modified in the presence of the flow. This equation, a fundamental constitutive relation between the amount of area stored in the fluctuations and the membrane tension, must be supplemented under… 
Hydrodynamics of confined membranes.
  • N. Gov, A. Zilman, S. Safran
  • Materials Science, Medicine
    Physical review. E, Statistical, nonlinear, and soft matter physics
  • 2004
The hydrodynamic interaction Lambdak and relaxation frequency omegak for the fluctuations of a membrane that is harmonically bounded to a permeable or impermeable wall is calculated and it is shown that due to the confining wall there is an increase in the effective viscosity of the fluid surrounding the membrane.
Membranes under shear stress: visualization of non-equilibrium domain patterns and domain fusion in a microfluidic device.
The results show the strong effect of the flow on the lipid membrane and it is believed that this phenomenon plays a crucial role in the processes of mechanotransduction in living cells.
Fluid vesicles in flow.
The dynamical behavior of giant fluid vesicles in various types of external hydrodynamic flow is reviewed, finding that in linear flows with both rotational and elongational components, the properties of the tank-treading and tumbling motions are well described by theoretical and numerical models.
Extension and measurements on a phospholipid vesicle by use of dual-beam optical tweezers
A vesicle whose membrane is composed of a phospholipid bilayer is called as a liposome. Since the fundamental structure of the membrane is the same as cell membranes, liposomes have been intensively
Electroformation of giant vesicles from an inverse phase precursor.


Deformation of giant lipid bilayer vesicles in a shear flow
We describe experimental studies of the deformation of giant lipid bilayer vesicles in shear flow. The experiments are carried out with a counterrotating Couette apparatus. The deformation depends on
Fluid membranes in hydrodynamic flow fields: Formalism and an application to fluctuating quasispherical vesicles in shear flow
Abstract:The dynamics of a single fluid bilayer membrane in an external hydrodynamic flow field is considered. The deterministic equation of motion for the configuration is derived taking into
Dynamical coarse-graining of highly fluctuating membranes under shear flow.
  • S. Marlow, P. Olmsted
  • Physics, Medicine
    Physical review. E, Statistical, nonlinear, and soft matter physics
  • 2002
The effect of strong shear flow on highly fluctuating lamellar systems stabilized by intermembrane collisions via the Helfrich interaction is studied. Advection enters the microscopic equation of
Effective-area elasticity and tension of micromanipulated membranes.
We evaluate the effective Hamiltonian governing, at the optically resolved scale, the elastic properties of micromanipulated membranes. We identify floppy, entropic-tense and stretched-tense regimes,
Elastic Properties of Lipid Bilayers: Theory and Possible Experiments
  • W. Helfrich
  • Chemistry, Materials Science
    Zeitschrift fur Naturforschung. Teil C: Biochemie, Biophysik, Biologie, Virologie
  • 1973
A theory of the elasticity of lipid bilayers is proposed and it is argued that in the case of vesicles (= closed bilayer films) the only elasticity controlling nonspherical shapes is that of curvature.
Active membrane fluctuations studied by micropipet aspiration.
It is shown that a natural choice of the parameters quantifying the strength of the active noise explains both the large amplitude of the observed effects and its remarkable insensitivity to the active-center density in the investigated range.
Swelling of Charged Lipids and Formation of Liposomes on Electrode Surfaces
Abstract External electric fields can induce liposorne formation on electrode surfaces if the swelling lipid is in liquid crystalline state. The lipid swelling and liposome formation depend on the
Statistical Thermodynamics Of Surfaces, Interfaces, And Membranes
* NOTE: Each Part begins with an Introduction, and ends with Problems and References. Mixtures and Interfaces * Complex Materials and Interfaces * Review of Classical Statistical Mechanics * Phase