Foams built up by non-Newtonian polymeric solutions: Free drainage

Arjmandi-Tash, Omid; Trybała, Anna; Mahdi, Faiz M.; Kovalchuk, N. M.; Starov, Victor

doi:10.1016/j.colsurfa.2016.07.097

Cited by 21 publications

(11 citation statements)

References 38 publications

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“…Foam is a multiphase colloidal system made from entrapment of gas in a continuous liquid phase. Drainage refers to gravity-and/or capillary-driven flow of liquid between the gas bubbles through Plateau borders, nodes, and films, and is well documented [1][2][3]. Plateau borders in foams have higher liquid content, and a free liquid film (~180 µm thick) can be used to model the electrokinetic flow inside Plateau borders.…”

Section: Introductionmentioning

confidence: 99%

Electroosmotic Flow in Free Liquid Films: Understanding Flow in Foam Plateau Borders

Sheik

Trybała

Starov

et al. 2018

Colloids and Interfaces

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Liquid flow in foams mostly proceeds through Plateau borders where liquid content is the highest. A sufficiently thick (~180 µm) free liquid film is a reasonable model for understanding of electrokinetic phenomena in foam Plateau borders. For this purpose, a flow cell with a suspended free liquid film has been designed for measurement of electrokinetic flow under an imposed electric potential difference. The free liquid film was stabilised by either anionic (sodium lauryl sulfate (NaDS)) or cationic (trimethyl(tetradecyl) ammonium bromide (TTAB)) surfactants. Fluid flow profiles in a stabilised free liquid film were measured by micron-resolution particle image velocimetry (µ-PIV) combined with a confocal laser scanning microscopy (CLSM) setup. Numerical simulations of electroosmotic flow in the same system were performed using the Finite Element Method. The computational geometry was generated by CLSM. A reasonably good agreement was found between the computed and experimentally measured velocity profiles. The features of the flow profiles and the velocity magnitude were mainly determined by the type of surfactant used. Irrespective of the surfactants used, electroosmotic flow dominated in the midfilm region, where the film is thinnest, while backflow due to pressure build-up developed near the glass rods, where the film is thickest.

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Section: Introductionmentioning

confidence: 99%

Electroosmotic Flow in Free Liquid Films: Understanding Flow in Foam Plateau Borders

Sheik

Trybała

Starov

et al. 2018

Colloids and Interfaces

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“…The flow inside the foam is assumed to occur inside the Plateau regions only and the contribution of the liquid flow in the films and nodes is neglected. In this case the drainage kinetics can be described by the following equation (Arjmandi-Tash et al 2017;Arjmandi-Tash et al 2015;Bureiko et al 2015;Kruglyakov et al 2008;Wang and Narsimhan 2006;Wierenga and Gruppen 2010).…”

Section: Theorymentioning

confidence: 99%

Drying of Foam under Microgravity Conditions

Koursari

Arjmandi-Tash

Trybała

et al. 2019

Microgravity Sci. Technol.

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Foams have recently been characterised as ideal products for pharmaceutical and topical use applications for the delivery of topical active agents. Foams are usually produced in a wet form but in a number of applications moderately dry foams are required. Drying of foam under terrestrial conditions proceeds under the action of gravity, which is impossible under microgravity condition. Below a new method of drying foams under microgravity condition is suggested. According to this method foam should be placed on a porous support, which will absorb the liquid from foam based on capillary forces only. The final liquid content inside the foam can be achieved by a proper selection of the porous support. The suggested method allows drying foams under microgravity conditions. Interaction of foams with porous support under terrestrial conditions was developed only recently and theoretically investigated (Arjmandi-Tash, O.

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“…A mathematical model of free drainage of foam built up by a power-law non-Newtonian liquid was developed by Starov et al [74]. A model for free drainage of foams produced from power-law non-Newtonian shear thinning liquids was presented and compared with experimental data for the drainage of foams formed by A22 and A33 polymeric solutions in [74]. The equation was deduced, which describes the drainage of foam build up by a power-law non-Newtonian liquid.…”

Section: Foam Drainagementioning

confidence: 99%

Biological applications of kinetics of wetting and spreading

Ahmed

Arjmandi-Tash

Cook

et al. 2017

Advances in Colloid and Interface Science

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Wetting and spreading kinetics of biological fluids has gained a substantial interest recently. The importance of these fluids in our lives has driven the pace of publications. Globally scientists have ever growing interest in understanding wetting phenomena due to its vast applications in biological fluids. It is impractical to review extremely large number of publications in the field of kinetics of complex biological fluids and cosmetic solutions on diverse surfaces. Therefore, biological and cosmetic applications of wetting and spreading dynamics are considered in the following areas: (i) Spreading of Newtonian liquids in the case of non-porous and porous substrates. It is shown that the spreading kinetics of a Newtonian droplet on non-porous and porous substrate can be defined through theoretical relations for droplet base radius on time, which agree well with the experimental results; (ii) Spreading of blood over porous substrates. It is shown that blood, which has a complex non-Newtonian rheology, can be successfully modelled with the help of simple power-law model for shear-thinning non-Newtonian liquids; (iii) Simultaneous spreading and evaporation kinetics of blood. This part enlightens different underlying mechanisms present in the wetting, spreading, evaporation and dried pattern formation of the blood droplets on solid substrates; (iv) Spreading over hair. In this part the wetting of hair tresses by aqueous solutions of two widely used by industry commercially available polymers, AculynTM 22 and AculynTM 33, are discussed. The influence of non-Newtonian rheology of these polymer solutions on the drainage of foams produced from these solutions is also briefly discussed.

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Foams built up by non-Newtonian polymeric solutions: Free drainage

Cited by 21 publications

References 38 publications

Electroosmotic Flow in Free Liquid Films: Understanding Flow in Foam Plateau Borders

Electroosmotic Flow in Free Liquid Films: Understanding Flow in Foam Plateau Borders

Drying of Foam under Microgravity Conditions

Biological applications of kinetics of wetting and spreading

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