On Wednesday October 30th at 02:00 p.m. in the Espace photonique meeting room, Dr. Bassam Jameel from Adam Mickiewicz University in Poznań (Poland) will give a talk on « Ultrasound Study of Magnetic Pickering Emulsions » .
Dr. Jameel is an expert in material characterisation with ultrasound, and is applying for a postdoctoral position at Fresnel. He will be in the lab until Wednesday evening. Feel free to come discuss with him if you are interested.
Abstract : A magnetic Pickering emulsion (MPE) is an emulsion stabilized by magnetic nanoparticles that accumulate at the droplet interface. Characterizing the stability of Pickering droplets and determining the shell thickness are critical for various applications. In this research, the ultrasound attenuation was measured experimentally, and an ultrasound scattering theory was implemented to analyze the measurement data. During the seminar, I will discuss the implementation of this theory, specifically using a core–shell model, and explore how different fabrication methods and nanoparticle concentrations affect droplet size and shell thickness. Additionally, rheological measurements, which reveal changes in the viscoelastic response of MPE, will be compared with the ultrasound data.
In the second part of the talk, I will address the potential applications of these characterized MPEs. Pickering droplets can function as sonosensitizers, enhancing ultrasound absorption in targeted areas. Computational approaches, combined with numerical simulations, offer the possibility of optimizing ultrasound heating by adjusting the shell thickness and core radius of the droplets. COMSOL simulations demonstrated how temperature and penetration depth change when using Pickering droplets, offering a way to achieve localized temperature increases without the need for complex focused-ultrasound devices. Additionally, these systems hold promise for magnetic separation, which was successfully tested using ultrasound methods under varying DC gradient magnetic fields. When magnetic fields change over time, magnetic heating occurs, as shown in numerous reports on magnetic suspensions and among the magnetic Pickering emulsions herein.
Invitation : Thomas Chaigne, MOSAIC Team
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L’Institut Fresnel s'excuse pour la gêne occasionnée et vous remercie par avance de votre compréhension.
