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godgoodstudy木虫 (小有名气)
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法国石油研究院（IFPEN）Microfluidics
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PhD position at IFP Energies nouvelles (IFPEN) Physical-chemistry – Microfluidics – CFD Study of dynamic interfacial properties with a microfluidics tensiometer: Experimental and multi-scale approach Emulsions are systems present in many industrial processes and products such wastewater management, biofuels, food, pharmaceutical products, cosmetics, etc. Understanding and controlling their stability is of prime importance to optimize the performance of the processes and products. Emulsions’ stability depends on the rheology and on the density difference between the dispersed and continuous phases (creaming or sedimentation), on the interactions between the drops (coalescence) and on their polydispersity (Oswald ripening). The interactions between the drops are notably governed by the value of the interfacial tension (IFT) and by the kinetics of diffusion and adsorption of the surfactants at the interfaces. These parameters must be determined under the pressure and temperature conditions of the process and of the final application as well as on the appropriate time scale. Currently, only the kinetics of diffusion and adsorption at times greater than a hundred milliseconds have been studied in the literature, due to lack of tools adapted to shorter times. A microfluidic tensiometer has been developed at IFPEN (Moiré et al., Langmuir 2017, 33, 10, 2531-2540) to reach time scales of the order of a millisecond under pressure and temperature conditions of industrial applications (up to 125 bar and 125°C) and over four orders of magnitude of interfacial tension. The challenge given to the PhD student will be to exploit the potential of this unique tensiometer to describe the phenomena of transport of surfactants at very short times. She/he will use the obtained results to optimize the current geometry of the tensiometer to extend the time scale of interfacial tension measurement. The objective is to go up to times of a few tens of minutes of phase equilibration. Moreover, the selected candidate will be in interaction with our CFD department in order to model the phenomena and optimize the tensiometer geometry. Note that the PhD project is part of an EU Marie Curie proposal currently under evaluation. Keywords: Physical-chemistry, Interfacial tension, Kinetics, Microfluidics, High-throughput experimentation Academic supervisor PhD, DALMAZZONE Christine, Physical Chemistry of Complex Fluids and Materials Department, christine.dalmazzone@ifpen.fr Pr. COLIN Annie, MIE, ESPCI Doctoral School ED388 CPCAPC, https://ed388.sorbonne-universite.fr/fr/index.html IFPEN supervisor PhD, MARSIGLIA Marie, Physical Chemistry of Complex Fluids and Materials Department, marie.marsiglia@ifpen.fr, 0000-0002-3694-6418 PhD location IFP Energies nouvelles, Rueil-Malmaison, France Duration and start date 3 years, starting in fourth quarter 2022 Employer IFP Energies nouvelles, Rueil-Malmaison, France Academic requirements Master degree in physical-chemistry with good knowledge in fluid mechanics Language requirements Fluency in English, French or German, willingness to learn French Other requirements Microfluidics, Matlab, CFD software appreciated - Have not lived more than 12 months in France during the last three years (MSCA requirement) To apply, please send your cover letter and CV to the IFPEN supervisor indicated here above. About IFP Energies nouvelles IFP Energies nouvelles is a French public-sector research, innovation and training center. Its mission is to develop efficient, economical, clean and sustainable technologies in the fields of energy, transport and the environment. For more information, see our WEB site. IFPEN offers a stimulating research environment, with access to first in class laboratory infrastructures and computing facilities. IFPEN offers competitive salary and benefits packages. All PhD students have access to dedicated seminars and training sessions. For more information, please see our dedicated WEB pages. |
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