Changing mechanical properties of lipid vesicle bilayers investigated by linear viscoelastic measurements

Smeulders, J.B.A.F.; Mellema, J.; Blom, C.

doi:10.1103/physreva.46.7708

Cited by 22 publications

(10 citation statements)

References 37 publications

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“…Apart from resistances against in-plane deformations such as shear and dilatation, complex fluid-fluid interfaces may also have a significant resistance against bending, and this resistance can also affect the dynamics of multiphase systems [2,[14][15][16][17][18][19][20]. Bending rigidity is most conveniently introduced through a curvature expansion of the surface tension, given by (correct up to second order in curvature) [21,22]…”

Section: Generalized Surface Momentum Balancesmentioning

confidence: 99%

Generalized surface momentum balances for the analysis of surface dilatational data

Sagis

2013

Eur. Phys. J. Spec. Top.

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Dilatational rheological properties of interfaces are often determined using drop tensiometers, in which the interface of the droplet is subjected to oscillatory area changes. A dynamic surface tension is determined either by image analysis of the droplet profile or by measuring the capillary pressure. Both analysis modes tend to use the Young-Laplace equation for determining the dynamic surface tension. For complex fluid-fluid interfaces there is experimental evidence that this equation does not describe the response of the interface to deformations adequately. Generalizations of this equation are available, and in this comment we will discuss these generalizations, and the conditions for which they reduce to the Young-Laplace equation.

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Section: Generalized Surface Momentum Balancesmentioning

confidence: 99%

Generalized surface momentum balances for the analysis of surface dilatational data

Sagis

2013

Eur. Phys. J. Spec. Top.

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“…This study sheds also another light on the interpretation of the viscoelastic behavior of aging vesicles. It was noticed [2] that during the aging process the measured second relaxation time increased and after a certain time it became constant. The conclusion was that fully aged vesicles have a constant minimum value of p. In the ex-I tended model this conclusion cannot be drawn.…”

Section: Discussionmentioning

confidence: 99%

“…The viscosity outside a vesicle is strongly in8uenced by the presence of other vesicles. Therefore g will be replaced by g~, which is an effective value that accounts for the viscosity felt by the vesicle (see [1,2]).…”

Section: When K And) G )And P the Approximate Relaxation Times Becomementioning

confidence: 99%

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Linear viscoelasticity in lipid bilayers of vesicles

1995

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In two preceding articles the complex shear viscosity of a dispersion of vesicles has been determined and from an observed macroscopic relaxation time that pertains to deformation of vesicles a value of the static shear modulus has been calculated with the use of the Oldroyd model. In the present paper this model has been extended by incorporating in the shear behavior of the lipid bilayer a linear viscoelastic behavior with one relaxation time in order to be able to relate the macroscopic relaxation time to a dynamic shear modulus instead of a static shear modulus. The latter is believed not to exist. With the extended Oldroyd model the experimental results can be interpreted. This leads to a value of the dynamic shear modulus.

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“…Let us assume we have an interface where surface tension, deviatoric stresses, and bending rigidity may all contribute to the response of the interface to an applied deformation. The latter contribution will in most cases be negligible, but there are some exceptions, such as vesicle membranes, or interfaces in phase separated biopolymer mixtures, where these contributions may be significant [1,[14][15][16][17][18][19][20]. In [6] we saw that for such a system the pressure difference over the interface is given by…”

Section: Strategies For Determining Dilatational Properties Of Complementioning

confidence: 99%

Dynamic surface tension of complex fluid-fluid interfaces: A useful concept, or not?

Sagis

2013

Eur. Phys. J. Spec. Top.

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Dilatational moduli are typically determined by subjecting interfaces to oscillatory area deformations, and are often defined in terms of the difference between the dynamic or transient surface tension of the interface (the surface tension in its deformed state), and the surface tension of the interface in its non-deformed state. Here we will discuss the usefulness of the dynamic surface tension concept in the characterization of dilatational properties of complex fluid-fluid interfaces. Complex fluid-fluid interfaces are interfaces stabilized by components which form mesophases (two-dimensionional gels, glasses, or (liquid) crystalline phases), as a result of in-plane interactions between the components. We will show that for such interfaces dilatational properties are not exclusively determined by the exchange of surface active components between interface and adjoining bulk phases, but also by in-plane viscoelastic stresses. The separation of these contributions remains a challenging problem which remains to be solved.

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Changing mechanical properties of lipid vesicle bilayers investigated by linear viscoelastic measurements

Cited by 22 publications

References 37 publications

Generalized surface momentum balances for the analysis of surface dilatational data

Generalized surface momentum balances for the analysis of surface dilatational data

Linear viscoelasticity in lipid bilayers of vesicles

Dynamic surface tension of complex fluid-fluid interfaces: A useful concept, or not?

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