Excess Area in Fluctuating-Membrane Systems

Roux, D.; Nallet, Frédéric; Freyssingeas, Éric; Porte, G.; Bassereau, Patricia; Skouri, M.; Marignan, J.

doi:10.1209/0295-5075/17/7/001

Cited by 69 publications

(72 citation statements)

References 31 publications

(1 reference statement)

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“…Swelling experiments provide a simple method to estimate the bending rigidity of undulation dominated systems [26,40,41]. In the swelling experiments, the repeating distanceD is measured as a function of the membrane volume fraction.…”

Section: Swelling Experimentsmentioning

confidence: 99%

“…Finally, while there are no other measurements of the bending modulus k c of C 10 E 3 membranes to compare with, we note that a value of about 1.8 k B T is perfectly consistent with the values reported for similar surfactant membranes. Values of (0.5...3)k B T have been determined from swelling experiments [13,26,40], the observation of the dynamics of fluctuations by dynamic light scattering [13,41,49], an osmotic stress technique [50], the shape analysis of the quasi-Bragg peaks [51], the compressibility modulus measured by a surface force apparatus [52] as well as from the quadrupole splitting in NMR experiments [15,53]. In most of these studies the surfactant concentration was much higher (up to 50 wt%) than in the present experiments.…”

Section: Transition Between Helfrich and Electrostatically Stabilizedmentioning

confidence: 99%

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Weakly charged lamellar bilayer system: Interplay between thermal undulations and electrostatic repulsion

Berlepsch

Vries

2000

Eur. Phys. J. E

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We study the interplay between thermal undulations and electrostatic interactions for weakly charged surfactant bilayers by measuring the backscattering of light from very dilute lamellar phases of the non-ionic surfactant triethylene glycol monodecyl ether (C10E3) doped with small amounts of the anionic surfactant sodium dodecyl sulphate (SDS), both with and without added electrolyte. Upon charging, the lamellar phases show a transition from undulation to electrostatic stabilization. Non-lamellar structures develop if the molar mixing ratio R = [SDS]/[C10E3] exceeds ≈ 2.5 × 10 −3 . Deviations from ideal swelling, D ∝ 1/Φ, whereD is the lamellar repeating distance and Φ the membrane volume fraction, were detected for all lamellar phases. Salt-free lamellar phases with charge densities below σc = 1.47 × 10 −4 e/nm 2 , as well as more highly charged lamellar phases at high ionic strength show a universal logarithmic deviation from ideal swelling that was analyzed using theories for undulation stabilized lamellar phases. Deviations from ideal swelling for electrostatically stabilized lamellar phases were analyzed using theories recently developed for undulations in charged lamellar phases. The fits to the various theories yield a value of kc,0 ≈ 1.8 kBT for the bending modulus of the C10E3 bilayers. PACS. 82.70.-y Disperse systems -61.30.Eb Experimental determinations of smectic, nematic, cholesteric, and other structures -68.10.-m Fluid surfaces and fluid-fluid interfaces

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Section: Swelling Experimentsmentioning

confidence: 99%

Section: Transition Between Helfrich and Electrostatically Stabilizedmentioning

confidence: 99%

Weakly charged lamellar bilayer system: Interplay between thermal undulations and electrostatic repulsion

Berlepsch

Vries

2000

Eur. Phys. J. E

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“…However, in the case of highly flexible bilayers, ΔA/A is non-negligible so that not only can d be significantly larger than d min , 109 but, since ΔA is directly proportional to T, d can increase with T. On the other hand, increasing the surface charge density σ in otherwise flexible bilayers, such as surfactant systems with κ ∼ k B T, gradually stiffens the bilayers, thereby decreasing ΔA and producing lower values of d. 110,111 In the systems investigated here (i.e., κ ∼ 20k B T), thermal undulations should not significantly affect d.…”

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confidence: 99%

Temperature Driven Annealing of Perforations in Bicellar Model Membranes

et al. 2011

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Bicellar model membranes composed of 1,2-dimyristoylphosphatidylcholine (DMPC) and 1,2-dihexanoylphosphatidylcholine (DHPC), with a DMPC/DHPC molar ratio of 5, and doped with the negatively charged lipid 1,2-dimyristoylphosphatidylglycerol (DMPG), at DMPG/DMPC molar ratios of 0.02 or 0.1, were examined using small angle neutron scattering (SANS), 31 P NMR, and 1 H pulsed field gradient (PFG) diffusion NMR with the goal of understanding temperature effects on the DHPC-dependent perforations in these self-assembled membrane mimetics. Over the temperature range studied via SANS (300À330 K), these bicellar lipid mixtures exhibited a well-ordered lamellar phase. The interlamellar spacing d increased with increasing temperature, in direct contrast to the decrease in d observed upon increasing temperature with otherwise identical lipid mixtures lacking DHPC. 31 P NMR measurements on magnetically aligned bicellar mixtures of identical composition indicated a progressive migration of DHPC from regions of high curvature into planar regions with increasing temperature, and in accord with the "mixed bicelle model" (Triba, M. N.; Warschawski, D. E.; Devaux, P. E. Biophys. J. 2005, 88, 1887À1901). Parallel PFG diffusion NMR measurements of transbilayer water diffusion, where the observed diffusion is dependent on the fractional surface area of lamellar perforations, showed that transbilayer water diffusion decreased with increasing temperature. A model is proposed consistent with the SANS, 31 P NMR, and PFG diffusion NMR data, wherein increasing temperature drives the progressive migration of DHPC out of highcurvature regions, consequently decreasing the fractional volume of lamellar perforations, so that water occupying these perforations redistributes into the interlamellar volume, thereby increasing the interlamellar spacing.

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“…In addition to this theoretical progress experimental groups succeeded in the last years to determine these material constants for a variety of mixtures [14,21,[31][32][33][34][35][36][37]. This opened new opportunities to test these theoretical models by a quantitative comparison of parameter-free predictions and experimental data [15,18,19,21,26,35].…”

Section: Introductionmentioning

confidence: 99%

Bending free energy and spontaneous curvature for micelles and microemulsions with weak and strong surfactants

Vollmer

2001

The European Physical Journal E

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For mixtures of water, oil and non-ionic surfactant the temperature-induced phase separation of a droplet-phase microemulsion into a phase of smaller sized droplets coexisting with a water-or oilrich phase is studied by differential-scanning microcalorimetry. A comparison of theoretical estimates and experimental findings for specific-heat measurements on mixtures containing different types of surfactants (weak and strong) support a broad range of applicability of an interfacial modeling ("Helfrich free energy"), provided a more general expression for the spontaneous curvature of the interface is considered than suggested so far. The model provides then a quantitative interfacial description even for the strongly curved diffuse interface of micelles of weak surfactants.

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Excess Area in Fluctuating-Membrane Systems

Cited by 69 publications

References 31 publications

Weakly charged lamellar bilayer system: Interplay between thermal undulations and electrostatic repulsion

Weakly charged lamellar bilayer system: Interplay between thermal undulations and electrostatic repulsion

Temperature Driven Annealing of Perforations in Bicellar Model Membranes

Bending free energy and spontaneous curvature for micelles and microemulsions with weak and strong surfactants

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