Analysis of the internal structure of monodisperse liquid foams by X-ray tomography

Meagher, A.J.; Mukherjee, M.; Weaire, D.; Hutzler, Stefan; Banhart, John; García‐Moreno, Francisco

doi:10.1039/c1sm05495c

Cited by 41 publications

(33 citation statements)

References 31 publications

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“…2 shows the example of such a foam floating on its foaming solution. As can be seen, these foams have the tendency to order [3][4][5][6], especially in the presence of templating boundaries (Section 3) or when confined in narrow tubes. A selection of experimental realisations of such ordered foams is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Structure and energy of liquid foams

Drenckhan

Hutzler

2015

Advances in Colloid and Interface Science

144

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a b s t r a c t a r t i c l e i n f oWe present an overview of recent advances in the understanding of foam structure and energy and their dependence on liquid volume fraction. We consider liquid foams in equilibrium for which the relevant energy is surface energy. Measurements of osmotic pressure can be used to determine this as a function of liquid fraction in good agreement with results from computer simulations. This approach is particularly useful in the description of foams with high liquid content, so-called wet foams. For such foams X-ray tomography proves to be an important technique in analysing order and disorder. Much of the discussion in this article is also relevant to bi-liquid foams, i.e. emulsions, and to solid foams, provided that the solidification preserves the structure of the initially liquid foam template.

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Section: Introductionmentioning

confidence: 99%

“…While the vast majority of statistical data on dry foam structure is from Surface Evolver simulations (Section 5.2), it is hoped that desktop X-ray tomography (Section 5.1), recently successfully applied to disordered and ordered wet foams [17,[47][48][49]4,25], can soon also be used for dry foams.…”

Section: The Dry Limit (φ B 005)mentioning

confidence: 99%

Structure and energy of liquid foams

Drenckhan

Hutzler

2015

Advances in Colloid and Interface Science

144

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“…The advent of synchrotron tomography and other non-destructive imaging techniques has led to unprecedented amounts of data about the internal structure of soft materials such as foams [4,5], and even its evolution in time, provided that it does not evolve so quickly that it moves significantly while an image is being made. For foams, we now have access to sequences of images, containing thousands of bubbles, undergoing coarsening (bubble volumes evolve due to gas diffusion between them) [6,7,8,9], drainage (liquid motion through the network of Plateau borders), and rheology (bulk motion of the foam itself) [10].…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of tomographic images of dry aqueous foams

Davies

Cox

Lambert

2013

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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X-ray tomography offers the possibility to examine the local changes in the structure of a three-dimensional aqueous foam as it flows, allowing a better fundamental understanding of foam rheology and the validation of models. We present an automated algorithm that reconstructs a dry aqueous foam from such images. Our algorithm uses ImageJ to extract from an image the topology of the network of Plateau borders in the foam, and then analyses this network to re-create the films and then the bubbles, and equilibrates the structure in Surface Evolver. We validate our algorithm and demonstrate its precision by applying it to simulated foam structures and analysing the topology and geometry obtained. We then apply our algorithm to a sequence of images from an experiment in which a spherical bead falls under its own weight through a polydisperse dry foam. This allows us to describe the evolution of the foam's liquid content and the bubble volumes with time as well as the distribution of bubble pressure and the forces exerted on a falling sphere.

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“…This indicates that the outer layers of the foam sample are ordered, in keeping with our previous experiments. 11 Incoherent grain boundaries are seen to form, separating the four ordered regions at the walls of the sample.…”

Section: Resultsmentioning

confidence: 98%

Slow crystallisation of a monodisperse foam stabilised against coarsening

et al. 2015

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The evolution of a three-dimensional monodisperse foam was investigated using X-ray tomography over the course of seven days. The coarsening of the sample was inhibited through the use of perfluorohexane gas.The internal configuration of bubbles is seen to change markedly, evolving from a disordered arrangement towards a more ordered state. We chart this ordering process through the use of the coordination number, the bond orientational order parameter (BOOP) and the translational order parameter.

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Analysis of the internal structure of monodisperse liquid foams by X-ray tomography

Cited by 41 publications

References 31 publications

Structure and energy of liquid foams

Structure and energy of liquid foams

Reconstruction of tomographic images of dry aqueous foams

Slow crystallisation of a monodisperse foam stabilised against coarsening

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