Generation and stability of bubbles in a cement based slurry

Petit, Pauline; Javierre, Isabelle; Jézequel, Pierre-Henri; Biance, Anne‐Laure

doi:10.1016/j.cemconres.2014.02.008

Cited by 49 publications

(25 citation statements)

References 26 publications

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“…θ = 0.6 %, caused a significant increase of PL from zero (no TTAB) to Φ = 0.60 at 100 s -1 . Data from Petit et al [20] showed that the contact angle of silica particles should be around 30-35° at such low surface coverage, which seems to be sufficient to ensure particle adsorption on the bubbles surface and to prevent bubble coalescence during shear (see section 3.3 for further explanations). The increase of θ from 1.6 to 6.8 % reduces the volume of trapped air at both shear rates, which is explained with the increased suspension viscosity, as shown in section 3.4.…”

Section: Effect Of Ttab Surface Coverage On the Foaminess Of 157 Wt mentioning

confidence: 99%

Role of Pickering stabilization and bulk gelation for the preparation and properties of solid silica foams

Lesov

Kovadjieva

Saison

et al. 2017

Journal of Colloid and Interface Science

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Foaming of particulate suspensions, followed by foam drying, is developed as an efficient method for production of highly porous materials with various applications. A key factor for success is the appropriate choice of surfactants which both modify the particle surface and stabilize the foam. Here we compare the efficiency of this method for silica suspensions containing two surfactants which lead to very different types of foam stabilization. Cationic TTAB leads to particle-stabilized foams (Pickering stabilization) whereas zwitterionic CAPB - to surfactant-stabilized foams. Thus we determined the general (common) features shared between the various surfactant systems: (1) The foaminess is controlled exclusively by the suspension viscosity under shearing conditions which mimic precisely the foaming process; (2) The foam stability to drainage and coarsening is controlled exclusively by the suspension yield stress; (3) The surfactant adsorption on the particle surface should occur in the time scale of seconds to minutes, thus ensuring appropriate rheological properties of the foaming suspension. Similar kinetic effects could be of high interest to other colloid systems and processes, e.g. for kinetic control of the internal structure and properties of aerogels produced from sheared suspensions, and for control of the transient rheological properties and non-Newtonian flow of particulate gels.

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Section: Effect Of Ttab Surface Coverage On the Foaminess Of 157 Wt mentioning

confidence: 99%

Role of Pickering stabilization and bulk gelation for the preparation and properties of solid silica foams

Lesov

Kovadjieva

Saison

et al. 2017

Journal of Colloid and Interface Science

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“…Controlling liquid foam lifetime and homogeneity is a real challenge for many applications, such as aerated materials manufacturing. Indeed, they are extensively used for their lightness, their thermal [9] or acoustic insulating properties, their green efficiency in the building industry [10], and more specifically their large surface area [11]. Recently, these aerated materials have been used, for example, as electrodes for supercapacitors or batteries [12], or as so-called thermal resonators for energy harvesting [13].…”

Section: Introductionmentioning

confidence: 99%

Thermally Enhanced Electro-osmosis to Control Foam Stability

Bonhomme

Biance

2020

Phys. Rev. X

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Liquid foam is a dense dispersion of liquid bubbles in a surfactant solution. Because of its large surface area, it is an out-of-equilibrium material that evolves with space and time because of coarsening, coalescence, and liquid drainage. In many applications, it is required to control the lifetime of a foam by limiting the drainage or triggering the collapse at a specific location or a given time. We show here that applying an external electric field at the edge of the foam induces some liquid flows. Depending on the flow magnitude, it controls either gravity driven drainage, the foam stability, or the foam collapse at a specific location. Thus, applying an electric field to a liquid foam can control its stability. The experimental results are quantitatively described by a simple model taking into account first the electro-osmotic transport in such a deformable medium and second the Marangoni flows induced by heterogeneous heating due to Joule effect. More specifically, we show for the first time that electro-osmosis can be strongly enhanced due to thermal gradients generated by the applied electric field.

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“…Nano-silica can increase the thickness of the liquid film, which greatly enhanced bubble stability and decreased the bubble collapse. Meanwhile, Petit fabricated a single stable cement bubble by bubbling in a pool filled with micrometric silica particles [171].…”

Section: Measures To Improve the Stability Of Air Bubbles In Fresh Comentioning

confidence: 99%

“…Petit et al [171] SEM; A device to fabricate stable and fully covered solid cement bubble Bubble stability is shown to be governed mainly by particle covering rate, which is maximized when the particle wetting angle prior to liquid approaches π/2.…”

Section: Research Testing Apparatus Primary Conclusion Summarymentioning

confidence: 99%

A Review on Bubble Stability in Fresh Concrete: Mechanisms and Main Factors

et al. 2020

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In order to improve the stability of air bubbles in fresh concrete, it is of great significance to have a better understanding of the mechanisms and main influencing factors of bubble stability. In the present review, the formation and collapse process of air bubbles in fresh concrete are essentially detailed; and the advances of major influencing factors of bubble stability are summarized. The results show that the surface tension of air–liquid interface exerts a huge impact on bubble stability by reducing surface free energy and Plateau drainage, as well as increasing the Gibbs surface elasticity. However, surface tension may not be the only determinant of bubble stability. Both the strength of bubble film and the diffusion rate of air through the membrane may also dominate bubble stability. The application of nano-silica is a current trend and plays a key role in ameliorating bubble stability. The foam stability could be increased by 6 times when the mass fraction of nano-particle reached 1.5%.

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Generation and stability of bubbles in a cement based slurry

Cited by 49 publications

References 26 publications

Role of Pickering stabilization and bulk gelation for the preparation and properties of solid silica foams

Role of Pickering stabilization and bulk gelation for the preparation and properties of solid silica foams

Thermally Enhanced Electro-osmosis to Control Foam Stability

A Review on Bubble Stability in Fresh Concrete: Mechanisms and Main Factors

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