A simple technique for the automation of bubble size measurements

Gaillard, Thibaut; Honorez, Clément; Jumeau, Maxime; Elias, Florence; Drenckhan, Wiebke

doi:10.1016/j.colsurfa.2015.01.089

Cited by 44 publications

(24 citation statements)

References 6 publications

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“…Bubble size measurements. The bubble size distribution was obtained by the "bubble raft" technique [11], which consists in spreading a small amount of the sample on the surface of a foaming solution bath, and then imaging the 2D structure obtained (see inset of figure 1). Size distributions were found to be well fitted by lognormal laws, with a median radius R and a polydispersity index PI 1 .…”

Section: Sample Preparationmentioning

confidence: 99%

Investigating the origin of acoustic attenuation in liquid foams

et al. 2017

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Liquid foams are known to be highly efficient to absorb acoustic waves but the origin of the sound dissipation remains unknown. In this paper, we present low frequency (0.5-4kHz) experimental results measured with an impedance tube and we confront the recorded attenuations with a simple model that considers the foam as a concentrate bubbly liquid. In order to identify the influence of the different parameters constituting the foams we probe samples with different gases, and various liquid fractions and bubble size distributions. We demonstrate that the intrinsic acoustic attenuation in the liquid foam is due to both thermal and viscous losses. The physical mechanism of the viscous term is not elucidated but the microscopic effective viscosity evidenced here can be described by a phenomenological law scaling with the bubble size and the gas density. In our experimental configuration a third dissipation term occurs. It comes from the viscous friction on the wall of the impedance tube and it is well described by the Kirchhoff law considering the macroscopic effective viscosity classically measured in rheology experiments.

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Section: Sample Preparationmentioning

confidence: 99%

Investigating the origin of acoustic attenuation in liquid foams

et al. 2017

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“…1). With a basic image processing in ImageJ software 16 , we obtain the inner radius of the bubbles, R c , as described in detail in 29 . Knowing the distance between the light and the sample, L l , the radius of the light, R l , the gap, h, between the two glass plates, the optical index, n, and the inner radius of the bubbles, we can calculate the real radius of the bubbles with Equ.…”

Section: B Bubble Size and Polydispersitymentioning

confidence: 99%

The surface tells it all: relationship between volume and surface fraction of liquid dispersions

et al. 2016

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The properties of liquid dispersions, such as foams or emulsions, depend strongly on the volume fraction ϕ of the continuous phase. Concentrating on the example of foams, we show experimentally and theoretically that ϕ may be related to the fraction ϕ of the surface at a wall which is wetted by the continuous phase - given an expression for the interfacial energy or osmotic pressure of the bulk system. Since the surface fraction ϕ can be readily determined from optical measurement and since there are good general approximations available for interfacial energy and osmotic pressure we thus arrive at an advantageous method of estimating ϕ. The same relationship between ϕ and ϕ is also expected to provide a good approximation of the fraction of the bubble or drop surface which is wetted by the continuous phase. This is a parameter of great importance for the rheology and ageing of liquid dispersions.

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“…Inferring the bulk distributions from this is not straightforward since bubbles organise differently at the flat container wall than in the bulk foam [84,85] -but often it gives a good approximation of the average bubble size. Bubble size distributions in bulk foams may be obtained by placing extracted foam samples on a liquid surface or between two parallel glass plates, with spacing less than the average bubble diameter [86]. Image analysis of the resulting single bubble layer or quasi-2D foam leads to a volume distribution of bulk bubbles.…”

Section: Experimental Techniquesmentioning

confidence: 99%

Structure and energy of liquid foams

Drenckhan

Hutzler

2015

Advances in Colloid and Interface Science

146

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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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A simple technique for the automation of bubble size measurements

Cited by 44 publications

References 6 publications

Investigating the origin of acoustic attenuation in liquid foams

Investigating the origin of acoustic attenuation in liquid foams

The surface tells it all: relationship between volume and surface fraction of liquid dispersions

Structure and energy of liquid foams

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