Search Results - "Kovalchuk, Nina"

Current applications of foams formed from mixed surfactant–polymer solutions by Bureiko, Andrei, Trybala, Anna, Kovalchuk, Nina, Starov, Victor

“…Foams cannot be generated without the use of special foaming agents, as pure liquids do not foam. The most common foaming agents are surfactants, however often…”
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Review of the role of surfactant dynamics in drop microfluidics by Kovalchuk, Nina M., Simmons, Mark J.H.

“…Surfactants are employed in microfluidic systems not just for drop stabilisation, but also to study local phenomena in industrial processes. On the scale of a…”
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Effect of surfactant on emulsification in microchannels by Kovalchuk, Nina M., Roumpea, Evangelia, Nowak, Emilia, Chinaud, Maxime, Angeli, Panagiota, Simmons, Mark J.H.

“…[Display omitted] •Dynamic interfacial tension (DIT) is a key parameter for controlled drop production.•Flow map is invariant in co-ordinates of capillary…”
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Experimental studies on droplet formation in a flow-focusing microchannel in the presence of surfactants by Roumpea, Evangelia, Kovalchuk, Nina M., Chinaud, Maxime, Nowak, Emilia, Simmons, Mark J.H., Angeli, Panagiota

“…•Use of an innovative, two-colour micro-PIV technique to investigate velocity fields.•Study of kinetics of surfactant absorption during the droplet formation…”
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Kinetics of Wetting and Spreading of Droplets over Various Substrates by Arjmandi-Tash, Omid, Kovalchuk, Nina M, Trybala, Anna, Kuchin, Igor V, Starov, Victor

“…There has been a substantial increase in the number of publications in the field of wetting and spreading since 2010. This increase in the rate of publications…”
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Spreading of aqueous surfactant solutions on oil substrates: Superspreaders vs non-superspreaders by Kovalchuk, Nina M., Sagisaka, Masanobu, Komiyama, Hinata, Simmons, Mark J.H.

“…[Display omitted] The question of why aqueous solutions of some surfactants demonstrate a rapid spreading (superspreading) over hydrophobic solid substrates,…”
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Drop formation in microfluidic cross-junction: jetting to dripping to jetting transition by Kovalchuk, Nina M., Sagisaka, Masanobu, Steponavicius, Kasparas, Vigolo, Daniele, Simmons, Mark J. H.

“…The regimes of drop generation were studied in a Dolomite microfluidic device which combined both hydrodynamic and geometrical flow focusing over a broad range…”
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Optimization of microfluidic synthesis of silver nanoparticles: A generic approach using machine learning by Nathanael, Konstantia, Cheng, Sibo, Kovalchuk, Nina M., Arcucci, Rossella, Simmons, Mark J.H.

“…The properties of silver nanoparticles (AgNPs) are affected by various parameters, making optimisation of their synthesis a laborious task. This optimisation…”
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Effect of soluble surfactants on pinch-off of moderately viscous drops and satellite size by Kovalchuk, Nina M., Jenkinson, Hannah, Miller, Reinhard, Simmons, Mark J.H.

“…[Display omitted] Surfactant redistribution in a liquid bridge close to drop detachment depends on competition between the bridge deformation rate and…”
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Effect of soluble surfactant on regime transitions at drop formation by Kovalchuk, Nina M., Simmons, Mark J.H.

“…[Display omitted] Formation of surfactant-laden aqueous drops by liquid flow through a capillary is studied and compared with two reference pure liquids, water…”
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Effect of Soluble Surfactants on the Kinetics of Thinning of Liquid Bridges during Drops Formation and on Size of Satellite Droplets by Kovalchuk, Nina M., Nowak, Emilia, Simmons, Mark J. H.

“…The results of an experimental study on thinning and breakage of liquid bridges during detachment of a drop from the tip of a capillary are presented for a…”
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Effect of surfactant concentration and viscosity of outer phase during the coalescence of a surfactant-laden drop with a surfactant-free drop by Nowak, Emilia, Kovalchuk, Nina M., Che, Zhizhao, Simmons, Mark J.H.

“…[Display omitted] •Coalescence of drops in oils of various viscosities follows the same power scaling law.•Marangoni flow induced by the interfacial…”
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Mass Transfer Accompanying Coalescence of Surfactant-Laden and Surfactant-Free Drop in a Microfluidic Channel by Kovalchuk, Nina M, Reichow, Marten, Frommweiler, Thomas, Vigolo, Daniele, Simmons, Mark J. H

“…The coalescence of two different drops, one surfactant-laden and the other surfactant-free, was studied under the condition of confined flow in a microchannel…”
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Complex Shapes and Dynamics of Dissolving Drops of Dichloromethane by Pimienta, Véronique, Brost, Michèle, Kovalchuk, Nina, Bresch, Stefan, Steinbock, Oliver

“…Generation of cohesive motion was observed during the dissolution of mm‐sized drops of dicholoromethane into aqueous surfactant solutions. This system shows…”
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Evaporation of Droplets of Surfactant Solutions by Semenov, Sergey, Trybala, Anna, Agogo, Hezekiah, Kovalchuk, Nina, Ortega, Francisco, Rubio, Ramón G, Starov, Víctor M, Velarde, Manuel G

“…The simultaneous spreading and evaporation of droplets of aqueous trisiloxane (superspreader) solutions onto a hydrophobic substrate has been studied both…”
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Kinetics of liquid bridges and formation of satellite droplets: Difference between micellar and bi-layer forming solutions by Kovalchuk, Nina M., Nowak, Emilia, Simmons, Mark J.H.

“…[Display omitted] •Effective surface tension can decrease as surfactant laden bridge goes to pinch-off.•Marangoni stresses are the reason for a decrease in…”
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Spontaneous oscillations due to solutal Marangoni instability: air/water interface by Kovalchuk Nina

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Residual film thickness following immiscible fluid displacement in noncircular microchannels at large capillary number by Lu, Yu, Kovalchuk, Nina M., Simmons, Mark J. H.

“…An experimental study of the displacement of one immiscible fluid by another was performed in microchannels with circular, square and near‐semicircular…”
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Interfacial instabilities due to immiscible fluid displacement in circular and non-circular microchannels by Lu, Yu, Kovalchuk, Nina M., Che, Zhizhao, Simmons, Mark J.H.

“…•Interfacial instabilities were observed during fluid displacement in microchannels.•The transition conditions of flow regimes are reflected in flow regime…”
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Spontaneous non-linear oscillations of interfacial tension at oil/water interface by Kovalchuk, Nina M.

“…Three particular systems are considered where transfer of a surfactant across the interface between two immiscible liquids, water and oil, is accompanied by…”
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