Complexity and self-organized criticality in liquid foams. A short review

Ritacco, Hernán

doi:10.1016/j.cis.2020.102282

Cited by 14 publications

(19 citation statements)

References 69 publications

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“…In the presence of this dynamic, it is reasonable to assume that, if the power released during a single rupture exceeds a certain threshold, a cascade of ruptures could follow, and these avalanches of bubble ruptures could dominate the dynamics of the collapse of all the macroscopic foam. This scenario is compatible with the idea of self-organized criticality (SOC). − In the present paper, we studied first the dynamics of single bubble bursting by recording the sound they emit when they burst. The emitted pressure wave carries information on the released energy, the characteristic rupture time, and the bubble geometry.…”

Section: Introductionsupporting

confidence: 54%

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Scaling Laws in the Dynamics of Collapse of Single Bubbles and 2D Foams

et al. 2020

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Avalanches of rupturing bubbles play an important role in the dynamics of collapse of macroscopic liquid foams. We hypothesized that the occurrence of cascades of rupturing bubbles in foams depends, at least in part, on the power released during the rupture of a bubble. In this paper, we present results on the dynamics of single bubble bursting obtained by analyzing the pressure wave (sound) emitted by the bubble when collapsing. We found that the released energy varies linearly with bubble size, the frequency of the emitted sound follows a power law with exponent 3/2 (compatible with the Helmholtz resonator model) and the duration of a rupturing event seems to be independent of bubble size. To correlate the dynamics of individual bubbles with the dynamics of foams, we studied the occurrence of avalanches on bubble rafts and found that the phenomenon appears to be a self-organized criticality (SOC) process. The distribution functions for the size of the avalanches are a power law with exponents between 2 and 3, depending on the surfactant concentration. The distribution of times between ruptures also follows a power law with exponents close to 1, independently of the surfactant concentration.

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Section: Introductionsupporting

confidence: 54%

“…We wondered if liquid foams could organize themselves in this critical state. This possibility was suggested earlier for the dynamics of foam collapse. ,,− Thus, let us first introduce briefly the concept of SOC processes.…”

Section: Resultsmentioning

confidence: 96%

Scaling Laws in the Dynamics of Collapse of Single Bubbles and 2D Foams

et al. 2020

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“…Physical systems exhibiting well-pronounced signatures of SOC have been investigated in the laboratory experiments with liquid foams [69], criticality at the hysteresis loop in ferromagnets and ferroelectric switching [36,70,71], crackling noise in strained and porous materials [72], and shape-memory alloys [73]. On a larger scale, SOC was demonstrated in the data of natural systems from the forest fire [74], earthquakes [75] and ocean geophysical turbulence [76] to solar flares [77] and other astrophysical phenomena [2].…”

Section: Self-organised Critical Systems and Their Network At Different Scalesmentioning

confidence: 99%

Self-Organised Critical Dynamics as a Key to Fundamental Features of Complexity in Physical, Biological, and Social Networks

Tadić

Melnik

2021

Dynamics

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Studies of many complex systems have revealed new collective behaviours that emerge through the mechanisms of self-organised critical fluctuations. Subject to the external and endogenous driving forces, these collective states with long-range spatial and temporal correlations often arise from the intrinsic dynamics with the threshold nonlinearity and geometry-conditioned interactions. The self-similarity of critical fluctuations enables us to describe the system using fewer parameters and universal functions that, on the other hand, can simplify the computational and information complexity. Currently, the cutting-edge research on self-organised critical systems across the scales strives to formulate a unifying mathematical framework, utilise the critical universal properties in information theory, and decipher the role of hidden geometry. As a prominent example, we study the field-driven spin dynamics on the hysteresis loop in a network with higher-order structures described by simplicial complexes, which provides a geometric-frustration environment. While providing motivational illustrations from physical, biological, and social systems, along with their networks, we also demonstrate how the self-organised criticality occurs at the interplay of the complex topology and driving mode. This study opens up new promising routes with powerful tools to address a long-standing challenge in the theory and applications of complexity science ingrained in the efficient analysis of self-organised critical states under the competing higher-order interactions embedded in complex geometries.

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“…Despite the importance of understanding foam structure at all length scales, only limited experimental techniques have been used in its study. Simulation studies focused on understanding the mechanics of foams under shear stress [91] have revealed the necessity for more precise experimental procedures to collect essential information on foam structure.…”

Section: Spectral Studies Of Foamsmentioning

confidence: 99%

Spectral Properties of Foams and Emulsions

2021

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The optical and spectral properties of foams and emulsions provide information about their micro-/nanostructures, chemical and time stability and molecular data of their components. Foams and emulsions are collections of different kinds of bubbles or drops with particular properties. A summary of various surfactant and emulsifier types is performed here, as well as an overview of methods for producing foams and emulsions. Absorption, reflectance, and vibrational spectroscopy (Fourier Transform Infrared spectroscopy-FTIR, Raman spectroscopy) studies are detailed in connection with the spectral characterization techniques of colloidal systems. Diffusing Wave Spectroscopy (DWS) data for foams and emulsions are likewise introduced. The utility of spectroscopic approaches has grown as processing power and analysis capabilities have improved. In addition, lasers offer advantages due to the specific properties of the emitted beams which allow focusing on very small volumes and enable accurate, fast, and high spatial resolution sample characterization. Emulsions and foams provide exceptional sensitive bases for measuring low concentrations of molecules down to the level of traces using spectroscopy techniques, thus opening new horizons in microfluidics.

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Complexity and self-organized criticality in liquid foams. A short review

Cited by 14 publications

References 69 publications

Scaling Laws in the Dynamics of Collapse of Single Bubbles and 2D Foams

Scaling Laws in the Dynamics of Collapse of Single Bubbles and 2D Foams

Self-Organised Critical Dynamics as a Key to Fundamental Features of Complexity in Physical, Biological, and Social Networks

Spectral Properties of Foams and Emulsions

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