2002
DOI: 10.1021/jp0255177
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Stability Criteria for Two-Dimensional Wetting in Monolayers

Abstract: Two-dimensional pendant liquid expanded droplets partially wet the liquid condensed/gas-phase boundaries in methyl octadecanoate Langmuir monolayers. Their shape is described by the Young−Laplace equation including long-range electrostatic interactions on a scale Δ. It is invariant under shape-invariant scale transformations. We show that the local stability at the three-phase intersection point is described by Young's equation for the contact angle. The contact angle is not invariant under shape-invariant sca… Show more

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Cited by 7 publications
(9 citation statements)
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References 30 publications
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“…Since the monolayer is not in a dense phase, the usual 3D viscosity η 3D of the water subphase dominates the 2D one [32,33,34], . We obtain straight lines, which proves that, at these length scales, the line tension is constant despite long-range dipolar interactions [12,13,24,30].…”
supporting
confidence: 59%
See 1 more Smart Citation
“…Since the monolayer is not in a dense phase, the usual 3D viscosity η 3D of the water subphase dominates the 2D one [32,33,34], . We obtain straight lines, which proves that, at these length scales, the line tension is constant despite long-range dipolar interactions [12,13,24,30].…”
supporting
confidence: 59%
“…The 2D gas phase of the monolayer, of low density, corresponds to a zero reflected intensity and appears black on the images, whereas the liquid phase, denser, appears brighter [23]. The average area is larger on the last images than on the first ones: this is due to the large-scale inhomogeneities (unavoidable with our preparation method) made apparent by the bulk flow, and not to the increase of area of each bubble separately (which contributes less than 6 % during our experiment, and is likely due to a partial solubilization of amphiphilic molecules in water, rather than to actual coarsening [24]). We do not observe wall breakage (it appears only at 4 times higher velocity, or with a stiffer fiber), nor perturbation of the liquid-gas coexistence.…”
mentioning
confidence: 69%
“…V 1 and V 2 denote the surface potentials of phase 1 and phase 2, whereε 0 = 8.854 pN/V 2 is the vacuum permittivity and ε w and ε air are the relative permittivities of water and air. The cutoff length Δ prevents the integral in (2) from diverging and has been interpreted as intermolecular spacing. ,, Recent studies by Heinig et al could show that in a methyl octadecanoate monolayer Δ > 0.1 μm, which suggests that Δ is the range of the short range interactions or the width of the domain borderline. For ferrofluids, which share the same free energy (2) as Langmuir monolayers, Δ is interpreted as the film thickness of the ferrofluid.…”
Section: Theorymentioning
confidence: 99%
“…Here we give a brief description of the numerics used to calculate the bubble shape. In contrast to the procedure described in ref a C 6 v symmetry is included in the Young−Laplace equation. The shape of the bubble is described by r ( s ), where s is the arc length with values between 0 and the perimeter P .…”
mentioning
confidence: 99%
“…The shapes adopted by the domains in the case of the DiPhyPC/(24:1)SM/Chol 1:1:1 mixture upon changes in the GUV lateral tension are reminiscent of what happens in the case of lipid monolayers when three different phases (i.e., gas, liquid expanded, and liquid condensed) are present at the air-water interface and the lateral pressure is varied. Theoretical approaches that are able to explain what happens to domains in the three-phase coexistence region have been developed (66)(67)(68). Accordingly, we investigated the possible equivalence of GUVs under the effect of an increasing lateral tension and monolayers in a Langmuir trough for which we controlled the lateral pressure.…”
Section: Langmuir Monolayers Of Diphypc/(24:1)sm/cholmentioning
confidence: 99%