Influence of fatty alcohol antifoam suspensions on foam stability

Joshi, Ketan; Jeelani, Shaik; Blickenstorfer, C.; Naegeli, I.; Windhab, Erich J.

doi:10.1016/j.colsurfa.2005.01.004

Cited by 37 publications

(23 citation statements)

References 20 publications

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“…The mean particle diameter of the volume density distribution of the suspension was 2:5 lm [24] measured by laser diffraction spectrometry. The number of carbon atoms in the hydrocarbon chain of the fatty alcohol varies between 14 and 30.…”

Section: Methodsmentioning

confidence: 99%

“…This means that the diffusion rate of surfactant S1, formation time of second bubble and chosen concentration of Polysorbate 20 were reasonable. The thickener and the preservative in the used suspension antifoam are essentially not surface active [24,51] since they are only necessary to stabilize the product during storage. In other applications, where two bubbles collide spontaneously depending on the type of flow field, the particle inward movement could be supported by a liquid inward flow, when the bubbles try to bounce.…”

Section: Mechanism Step Ii: Particle Inward Movement Due To Surfactanmentioning

confidence: 99%

“…The same procedure was carried out as described by Joshi et al [24]. The fatty alcohol plate was attached to the balance with a flexible suspension to obtain perfect alignment.…”

Section: Wilhelmy Plate Tensiometrymentioning

confidence: 99%

“…Measurements were carried out with and without the addition of 7:4 ll antifoam. The percentage reduction in air was calculated by knowing the area under the air content curve with and without antifoam using the equation given by Joshi et al [24].…”

Section: Foam Columnmentioning

confidence: 99%

“…The foam column set up used to measure macroscopic antifoam efficiency is described elsewhere [24]. Experiments were carried out at a constant temperature of 25°C.…”

Section: Foam Columnmentioning

confidence: 99%

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Mechanism of bubble coalescence induced by surfactant covered antifoam particles

Joshi

Baumann

Jeelani

et al. 2009

Journal of Colloid and Interface Science

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Section: Methodsmentioning

confidence: 99%

Section: Mechanism Step Ii: Particle Inward Movement Due To Surfactanmentioning

confidence: 99%

“…The same procedure was carried out as described by Joshi et al [24]. The fatty alcohol plate was attached to the balance with a flexible suspension to obtain perfect alignment.…”

Section: Wilhelmy Plate Tensiometrymentioning

confidence: 99%

Section: Foam Columnmentioning

confidence: 99%

“…The foam column set up used to measure macroscopic antifoam efficiency is described elsewhere [24]. Experiments were carried out at a constant temperature of 25°C.…”

Section: Foam Columnmentioning

confidence: 99%

See 3 more Smart Citations

Mechanism of bubble coalescence induced by surfactant covered antifoam particles

Joshi

Baumann

Jeelani

et al. 2009

Journal of Colloid and Interface Science

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Antifoaming Agents

Hilberer¹,

Chao²

2012

Encyclopedia of Polymer Science and Technology

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A review is presented of the materials used to control or eliminate foam in industrial processes and how these materials function. These materials are classified by their chemical type. The main active liquid‐phase components are hydrocarbon oils, polyethers, and silicone fluids; the main solid‐phase components are waxy hydrocarbons and hydrophobic silica. Formulating the antifoam active into a suitable delivery system is essential to ensure optimal performance in terms of activity, physical and chemical stability, cost, ease of use and for preventing negative side, and downstream effects. Examples of formulations for antifoams delivery in dispersions, emulsions, or powders are described. The mechanisms of foaming and defoaming are outlined with an emphasis on surface behavior such as entering, spreading, bridging, stretching, and dewetting phenomena. The importance of entry barrier on the rapidity of antifoaming action, the role of dispersed hydrophobic solids, and the mechanism of antifoam deactivation are highlighted. Applications in various areas are briefly reviewed, including pulp and paper, fermentation, paints, coatings and inks, oil and petrochemicals, cleaning compounds, wastewater treatment, metal working, polymerization, construction, textiles, fertilizers, food and beverages, leather, adhesives and sealants, chemical processing, and, medical and pharmaceuticals. Economic and health and safety factors are considered. Test methods, such as pneumatic, dynamic, shaking, pouring, stirring, and blending methods, are also briefly reviewed.

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A Comprehensive Review on Emulsions and Emulsion Stability in Chemical and Energy Industries

2018

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Emulsion refers to a mixture that includes two or more liquid phases. The uses of emulsions are found in several chemical, energy, and environmental industries such as the food, health care, chemical synthesis, and firefighting sectors. Water‐in‐oil emulsions are formed spontaneously during oil production when oil and water are mixed together and in the presence of asphaltene as a naturally occurring surfactant. For operational and economic reasons, oil emulsions need to be treated to recover both oil and water phases. To develop more efficient emulsion treatments, it is essential to have a better understanding of the factors that affect emulsion formation and stability. The droplet size variation is an important parameter that influences the stability and rheological characteristics of the emulsions. In addition, the available interfacial area for any possible chemical reactions might affect the behaviours and properties of the emulsions in various transport phenomena systems. The adequate knowledge of the factors and mechanisms affecting the droplet size and emulsion stability still needs further engineering and research activities. This study is aimed to provide a comprehensive literature review on the formation of water/oil emulsions and their stability in various physical systems (e.g., pipeline networks and porous media). In this review, fundamental aspects of emulsions, emulsion formation mechanisms, analytical models, and numerical solutions for the description and characterization of the behaviours of emulsions in porous media and/or separators are discussed. The effects of different fluid properties, physical model characteristics, and operational conditions on emulsion behaviours are studied. This paper also summarizes the previous experimental and modelling studies and methodologies with a focus on reliable laboratory equipment/tools and simulation and modelling packages/strategies for the investigation of emulsion stability and droplet size distribution where a systematic parametric sensitivity analysis to study various effects of important thermodynamic, process, and medium properties on the targeted variables is conducted. This review manuscript provides useful guidelines to characterize and model emulsions and their behaviours in different industrial sectors, which will considerably help to conduct better design and optimal operation of corresponding equipment.

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Influence of fatty alcohol antifoam suspensions on foam stability

Cited by 37 publications

References 20 publications

Mechanism of bubble coalescence induced by surfactant covered antifoam particles

Mechanism of bubble coalescence induced by surfactant covered antifoam particles

Antifoaming Agents

A Comprehensive Review on Emulsions and Emulsion Stability in Chemical and Energy Industries

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