Evanescent (surface) wave holographic recording in thin polymeric film

Müller, Klaus; Sainov, S.; Mittler‐Neher, Silvia; Knoll, Wolfgang

doi:10.1088/0953-8984/11/49/302

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…This observation differs from the results of experiments recently conducted on the collapsing process of aqueous foams. Actually, avalanches of popping bubbles were put evidenced during the coarsening of two- and three-dimensional aqueous foams, − whereas in the present study, bursting events appear to be spatially and temporally noncorrelated.…”

Section: Discussioncontrasting

confidence: 50%

Capillary-Driven Flower-Shaped Structures around Bubbles Collapsing in a Bubble Raft at the Surface of a Liquid of Low Viscosity

Liger-Belair¹,

Jeandet²

2003

Langmuir

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By using a classical photo camera and a high-speed video camera, snapshots and time sequences of the dynamics of champagne bubbles collapsing close to each other in a bubble raft composed of quite monodisperse millimetric bubbles were made, thus completing two recent works (Liger-Belair et al. in C. R. Acad. Sci. Paris Série 4 2001, 2, 775−780 and Liger-Belair in Ann. Phys. Fr. 2002, 27 (4), 1−106). Bubble caps of bubbles adjacent to a collapsing one were found to be strikingly stretched toward the lowest part of the cavity left by the central bursting bubble. Orders of magnitude of shear stresses developed in the adjacent deformed bubble caps were indirectly estimated. Our results strongly suggest, in the thin film of adjacent bubble caps, stresses higher than those observed around a single millimetric collapsing bubble. High-speed time sequences also proved that bubble caps in touch with collapsing bubbles were never found to rupture, thus causing in turn a chain reaction. As in the case of single collapsing cavities, it was also observed that a tiny daughter bubble, approximately 10 times smaller than the initial central bursting bubble, was entrapped during the collapsing process of the central cavity.

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Section: Discussioncontrasting

confidence: 50%

Capillary-Driven Flower-Shaped Structures around Bubbles Collapsing in a Bubble Raft at the Surface of a Liquid of Low Viscosity

Liger-Belair¹,

Jeandet²

2003

Langmuir

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“…This question has motivated a lot of studies. However, no simple conclusions emerged from these studies. − The role of the film size in the coalescence process remains, for example, very unclear. A widely accepted and intuitive argument is that large bubbles are more fragile than the smallest ones and that the probability of rupture of a film is simply proportional to its surface area. ,− On the contrary, acoustic experiments have demonstrated that small and large bubbles are involved in the avalanche process during the dynamics of a collapsing foam.…”

mentioning

confidence: 99%

Coalescence in Draining Foams

2003

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Cellular material (emulsions, foams) made out of two different phases, one dispersed in another, may coarsen with time through coalescence, which is the rupture of the thin liquid film that separates two adjacent droplets or bubbles. In this Letter, we study destruction through coalescence of a model cellular material: a monodisperse soap foam. We report the existence of a sharp destabilization threshold controlled only by the liquid fraction of the foam at which the rate of coalescence increases dramatically. We point out a coupling between drainage and coalescence. We suggest that the rearrangements of the bubbles during the drainage of the foam induce an increase of the area of the bubbles which decreases temporarily the amount of adsorbed surfactant by unit area and weakens the interfaces.

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“…Spontaneous and strongly correlated, dynamic collective behavior originating in the internal degrees of freedom of the constituent molecules give rise to a rich variety of nonlinear physical and chemical effects . Fracture of soft condensed matter such as gels, vesicles, colloidal suspensions, Langmuir monolayers, − and foams result in various fracture patterns and spatio temporal characteristics.…”

mentioning

confidence: 99%

Modulation Crack Growth and Crack Coalescence upon Langmuir Monolayer Collapse

Hatta

Fischer

2001

J. Phys. Chem. B

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An extensive study for Langmuir monolayer collapse is carried out to explore the generality of classification of their crack patterns (E. Hatta et al. Eur. Phys. J. 1999, B11, 609) and to analyze crack kinetics in the anisotropic cracks. Upon compression of fatty acid monolayers beyond the collapse pressure three classes of fracture patterns, a surface roughening, random crack network, or anisotropic fracture, can be observed depending on chain length of the fatty acid, pH value, and ion concentration of the subphase. A statistical characterization of the anisotropic crack growth of Langmuir monolayer fracture is presented. Anisotropic cracks grow on a Co 2+ water subphase as quasi-periodic modulations, branching off previously formed cracks, interrupted by the coalescence of modulation cracks. Slight changes in pH and concentration of Co 2+ ions in the subphase cause drastic changes of the modulation crack coalescence rate. We suggest, that differences in the viscoelastic nature of the monolayer are the main causes for the three types of crack growth scenaria.In soft condensed matter already moderate external stress may lead to nonlinear response of the material. Spontaneous and strongly correlated, dynamic collective behavior originating in the internal degrees of freedom of the constituent molecules give rise to a rich variety of nonlinear physical and chemical effects. 1 Fracture of soft condensed matter such as gels, 2 vesicles, 3 colloidal suspensions, 4 Langmuir monolayers, 5-9 and foams 10 result in various fracture patterns and spatio temporal characteristics.Different material properties in ordered and disordered matter govern the formation, 11 evolution, 12 and coalescence 13 of cracks. In solids, the simplest model is that of the competition of stress release versus the creation of surface energy (Griffith criterion 11 ), which governs the formation of a crack. It usually works well, because the region of large deformation and hence nonlinear stress-strain relationship is restricted to a small area near the tip of the crack. In soft condensed matter large deformation can exist in a macroscopic region ranging far away from the tip. It is therefore not surprising to observe new types of crack growth unexplored in solid-state materials. As the nonlinear material parameters in the constitutive equations become more important, there are several ways in which a system can change its dynamical behavior. One of the major experimental problems in following the crack dynamics arises due to the time scale on which cracking occurs in solid-state material. Usually, a crack alternates between rapid motion and arrest, and it is difficult to resolve the evolution of a crack growth. We will show that promising systems to overcome such problems are Langmuir monolayers. 14 Langmuir monolayers may crack, when compressed beyond the collapse pressure, where the two-dimensional arrangement of molecules at the air/water interface becomes unstable and the molecules start to explore the third dimension. Different phases, with...

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Evanescent (surface) wave holographic recording in thin polymeric film

Cited by 5 publications

References 5 publications

Capillary-Driven Flower-Shaped Structures around Bubbles Collapsing in a Bubble Raft at the Surface of a Liquid of Low Viscosity

Capillary-Driven Flower-Shaped Structures around Bubbles Collapsing in a Bubble Raft at the Surface of a Liquid of Low Viscosity

Coalescence in Draining Foams

Modulation Crack Growth and Crack Coalescence upon Langmuir Monolayer Collapse

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